move native services under services/

moved surfaceflinger, audioflinger, cameraservice

all native services should now reside in this location.

Change-Id: Iee42b83dd2a94c3bf5107ab0895fe2dfcd5337a8

36 files changed, 8940 insertions, 0 deletions

diff --git a/services/surfaceflinger/Android.mk b/services/surfaceflinger/Android.mk
new file mode 100644
index 0000000..a14bfb5
--- /dev/null
+++ b/services/surfaceflinger/Android.mk
@@ -0,0 +1,52 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+    clz.cpp.arm \
+    DisplayHardware/DisplayHardware.cpp \
+    DisplayHardware/DisplayHardwareBase.cpp \
+    BlurFilter.cpp.arm \
+    GLExtensions.cpp \
+    Layer.cpp \
+    LayerBase.cpp \
+    LayerBuffer.cpp \
+    LayerBlur.cpp \
+    LayerDim.cpp \
+    MessageQueue.cpp \
+    SurfaceFlinger.cpp \
+    TextureManager.cpp \
+    Transform.cpp
+
+LOCAL_CFLAGS:= -DLOG_TAG=\"SurfaceFlinger\"
+LOCAL_CFLAGS += -DGL_GLEXT_PROTOTYPES -DEGL_EGLEXT_PROTOTYPES
+
+ifeq ($(TARGET_BOARD_PLATFORM), omap3)
+	LOCAL_CFLAGS += -DNO_RGBX_8888
+endif
+
+# need "-lrt" on Linux simulator to pick up clock_gettime
+ifeq ($(TARGET_SIMULATOR),true)
+	ifeq ($(HOST_OS),linux)
+		LOCAL_LDLIBS += -lrt -lpthread
+	endif
+endif
+
+LOCAL_SHARED_LIBRARIES := \
+	libcutils \
+	libpixelflinger \
+	libhardware \
+	libutils \
+	libEGL \
+	libGLESv1_CM \
+	libbinder \
+	libui \
+	libsurfaceflinger_client
+
+LOCAL_C_INCLUDES := \
+	$(call include-path-for, corecg graphics)
+
+LOCAL_C_INCLUDES += hardware/libhardware/modules/gralloc
+
+LOCAL_MODULE:= libsurfaceflinger
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/services/surfaceflinger/Barrier.h b/services/surfaceflinger/Barrier.h
new file mode 100644
index 0000000..6f8507e
--- /dev/null
+++ b/services/surfaceflinger/Barrier.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_BARRIER_H
+#define ANDROID_BARRIER_H
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <utils/threads.h>
+
+namespace android {
+
+class Barrier
+{
+public:
+    inline Barrier() : state(CLOSED) { }
+    inline ~Barrier() { }
+    void open() {
+        Mutex::Autolock _l(lock);
+        state = OPENED;
+        cv.broadcast();
+    }
+    void close() {
+        Mutex::Autolock _l(lock);
+        state = CLOSED;
+    }
+    void wait() const {
+        Mutex::Autolock _l(lock);
+        while (state == CLOSED) {
+            cv.wait(lock);
+        }
+    }
+private:
+    enum { OPENED, CLOSED };
+    mutable     Mutex       lock;
+    mutable     Condition   cv;
+    volatile    int         state;
+};
+
+}; // namespace android
+
+#endif // ANDROID_BARRIER_H
diff --git a/services/surfaceflinger/BlurFilter.cpp b/services/surfaceflinger/BlurFilter.cpp
new file mode 100644
index 0000000..1ffbd5b
--- /dev/null
+++ b/services/surfaceflinger/BlurFilter.cpp
@@ -0,0 +1,376 @@
+/* 
+**
+** Copyright 2006, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <utils/Errors.h>
+
+#include <pixelflinger/pixelflinger.h>
+
+#include "clz.h"
+
+#define LIKELY( exp )       (__builtin_expect( (exp) != 0, true  ))
+#define UNLIKELY( exp )     (__builtin_expect( (exp) != 0, false ))
+
+namespace android {
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+inline uint32_t BLUR_RGBA_TO_HOST(uint32_t v) {
+    return v;
+}
+inline uint32_t BLUR_HOST_TO_RGBA(uint32_t v) {
+    return v;
+}
+#else
+inline uint32_t BLUR_RGBA_TO_HOST(uint32_t v) {
+    return (v<<24) | (v>>24) | ((v<<8)&0xff0000) | ((v>>8)&0xff00);
+}
+inline uint32_t BLUR_HOST_TO_RGBA(uint32_t v) {
+    return (v<<24) | (v>>24) | ((v<<8)&0xff0000) | ((v>>8)&0xff00);
+}
+#endif
+
+const int BLUR_DITHER_BITS = 6;  // dither weights stored on 6 bits
+const int BLUR_DITHER_ORDER_SHIFT= 3;
+const int BLUR_DITHER_ORDER      = (1<<BLUR_DITHER_ORDER_SHIFT);
+const int BLUR_DITHER_SIZE       = BLUR_DITHER_ORDER * BLUR_DITHER_ORDER;
+const int BLUR_DITHER_MASK       = BLUR_DITHER_ORDER-1;
+
+static const uint8_t gDitherMatrix[BLUR_DITHER_SIZE] = {
+     0, 32,  8, 40,  2, 34, 10, 42,
+    48, 16, 56, 24, 50, 18, 58, 26,
+    12, 44,  4, 36, 14, 46,  6, 38,
+    60, 28, 52, 20, 62, 30, 54, 22,
+     3, 35, 11, 43,  1, 33,  9, 41,
+    51, 19, 59, 27, 49, 17, 57, 25,
+    15, 47,  7, 39, 13, 45,  5, 37,
+    63, 31, 55, 23, 61, 29, 53, 21
+};
+
+
+template <int FACTOR = 0>
+struct BlurColor565
+{
+    typedef uint16_t type;
+    int r, g, b;    
+    inline BlurColor565() { }
+    inline BlurColor565(uint16_t v) {
+        r = v >> 11;
+        g = (v >> 5) & 0x3E;
+        b = v & 0x1F;
+    }
+    inline void clear() { r=g=b=0; }
+    inline uint16_t to(int shift, int last, int dither) const {
+        int R = r;
+        int G = g;
+        int B = b;
+        if  (UNLIKELY(last)) {
+            if (FACTOR>0) {
+                int L = (R+G+B)>>1;
+                R += (((L>>1) - R) * FACTOR) >> 8;
+                G += (((L   ) - G) * FACTOR) >> 8;
+                B += (((L>>1) - B) * FACTOR) >> 8;
+            }
+            R += (dither << shift) >> BLUR_DITHER_BITS;
+            G += (dither << shift) >> BLUR_DITHER_BITS;
+            B += (dither << shift) >> BLUR_DITHER_BITS;
+        }
+        R >>= shift;
+        G >>= shift;
+        B >>= shift;
+        return (R<<11) | (G<<5) | B;
+    }    
+    inline BlurColor565& operator += (const BlurColor565& rhs) {
+        r += rhs.r;
+        g += rhs.g;
+        b += rhs.b;
+        return *this;
+    }
+    inline BlurColor565& operator -= (const BlurColor565& rhs) {
+        r -= rhs.r;
+        g -= rhs.g;
+        b -= rhs.b;
+        return *this;
+    }
+};
+
+template <int FACTOR = 0>
+struct BlurColor888X
+{
+    typedef uint32_t type;
+    int r, g, b;    
+    inline BlurColor888X() { }
+    inline BlurColor888X(uint32_t v) {
+        v = BLUR_RGBA_TO_HOST(v);
+        r = v & 0xFF;
+        g = (v >>  8) & 0xFF;
+        b = (v >> 16) & 0xFF;
+    }
+    inline void clear() { r=g=b=0; }
+    inline uint32_t to(int shift, int last, int dither) const {
+        int R = r;
+        int G = g;
+        int B = b;
+        if  (UNLIKELY(last)) {
+            if (FACTOR>0) {
+                int L = (R+G+G+B)>>2;
+                R += ((L - R) * FACTOR) >> 8;
+                G += ((L - G) * FACTOR) >> 8;
+                B += ((L - B) * FACTOR) >> 8;
+            }
+        }
+        R >>= shift;
+        G >>= shift;
+        B >>= shift;
+        return BLUR_HOST_TO_RGBA((0xFF<<24) | (B<<16) | (G<<8) | R);
+    }    
+    inline BlurColor888X& operator += (const BlurColor888X& rhs) {
+        r += rhs.r;
+        g += rhs.g;
+        b += rhs.b;
+        return *this;
+    }
+    inline BlurColor888X& operator -= (const BlurColor888X& rhs) {
+        r -= rhs.r;
+        g -= rhs.g;
+        b -= rhs.b;
+        return *this;
+    }
+};
+
+struct BlurGray565
+{
+    typedef uint16_t type;
+    int l;    
+    inline BlurGray565() { }
+    inline BlurGray565(uint16_t v) {
+        int r = v >> 11;
+        int g = (v >> 5) & 0x3F;
+        int b = v & 0x1F;
+        l = (r + g + b + 1)>>1;
+    }
+    inline void clear() { l=0; }
+    inline uint16_t to(int shift, int last, int dither) const {
+        int L = l;
+        if  (UNLIKELY(last)) {
+            L += (dither << shift) >> BLUR_DITHER_BITS;
+        }
+        L >>= shift;
+        return ((L>>1)<<11) | (L<<5) | (L>>1);
+    }
+    inline BlurGray565& operator += (const BlurGray565& rhs) {
+        l += rhs.l;
+        return *this;
+    }
+    inline BlurGray565& operator -= (const BlurGray565& rhs) {
+        l -= rhs.l;
+        return *this;
+    }
+};
+
+struct BlurGray8888
+{
+    typedef uint32_t type;
+    int l, a;    
+    inline BlurGray8888() { }
+    inline BlurGray8888(uint32_t v) {
+        v = BLUR_RGBA_TO_HOST(v);
+        int r = v & 0xFF;
+        int g = (v >>  8) & 0xFF;
+        int b = (v >> 16) & 0xFF;
+        a = v >> 24;
+        l = r + g + g + b;
+    }    
+    inline void clear() { l=a=0; }
+    inline uint32_t to(int shift, int last, int dither) const {
+        int L = l;
+        int A = a;
+        if  (UNLIKELY(last)) {
+            L += (dither << (shift+2)) >> BLUR_DITHER_BITS;
+            A += (dither << shift) >> BLUR_DITHER_BITS;
+        }
+        L >>= (shift+2);
+        A >>= shift;
+        return BLUR_HOST_TO_RGBA((A<<24) | (L<<16) | (L<<8) | L);
+    }
+    inline BlurGray8888& operator += (const BlurGray8888& rhs) {
+        l += rhs.l;
+        a += rhs.a;
+        return *this;
+    }
+    inline BlurGray8888& operator -= (const BlurGray8888& rhs) {
+        l -= rhs.l;
+        a -= rhs.a;
+        return *this;
+    }
+};
+
+
+template<typename PIXEL>
+static status_t blurFilter(
+        GGLSurface const* dst,
+        GGLSurface const* src,
+        int kernelSizeUser,
+        int repeat)
+{
+    typedef typename PIXEL::type TYPE;
+
+    const int shift             = 31 - clz(kernelSizeUser);
+    const int areaShift         = shift*2;
+    const int kernelSize        = 1<<shift;
+    const int kernelHalfSize    = kernelSize/2;
+    const int mask              = kernelSize-1;
+    const int w                 = src->width;
+    const int h                 = src->height;
+    const uint8_t* ditherMatrix = gDitherMatrix;
+
+    // we need a temporary buffer to store one line of blurred columns
+    // as well as kernelSize lines of source pixels organized as a ring buffer.
+    void* const temporary_buffer = malloc(
+            (w + kernelSize) * sizeof(PIXEL) +
+            (src->stride * kernelSize) * sizeof(TYPE));
+    if (!temporary_buffer)
+        return NO_MEMORY;
+
+    PIXEL* const sums = (PIXEL*)temporary_buffer;
+    TYPE* const scratch = (TYPE*)(sums + w + kernelSize);
+
+    // Apply the blur 'repeat' times, this is used to approximate
+    // gaussian blurs. 3 times gives good results.
+    for (int k=0 ; k<repeat ; k++) {
+
+        // Clear the columns sums for this round
+        memset(sums, 0, (w + kernelSize) * sizeof(PIXEL));
+        TYPE* head;
+        TYPE pixel;
+        PIXEL current;
+
+        // Since we're going to override the source data we need
+        // to copy it in a temporary buffer. Only kernelSize lines are
+        // required. But since we start in the center of the kernel,
+        // we only copy half of the data, and fill the rest with zeros
+        // (assuming black/transparent pixels).
+        memcpy( scratch + src->stride*kernelHalfSize,
+                src->data,
+                src->stride*kernelHalfSize*sizeof(TYPE));
+
+        // sum half of each column, because we assume the first half is
+        // zeros (black/transparent).
+        for (int y=0 ; y<kernelHalfSize ; y++) {
+            head = (TYPE*)src->data + y*src->stride;
+            for (int x=0 ; x<w ; x++)
+                sums[x] += PIXEL( *head++ );
+        }
+
+        for (int y=0 ; y<h ; y++) {
+            TYPE* fb = (TYPE*)dst->data + y*dst->stride;
+
+            // compute the dither matrix line
+            uint8_t const * ditherY = ditherMatrix
+                    + (y & BLUR_DITHER_MASK)*BLUR_DITHER_ORDER;
+
+            // Horizontal blur pass on the columns sums
+            int count, dither, x=0;
+            PIXEL const * out= sums;
+            PIXEL const * in = sums;
+            current.clear();
+
+            count = kernelHalfSize;
+            do {
+                current += *in;
+                in++;
+            } while (--count);
+            
+            count = kernelHalfSize;
+            do {
+                current += *in;
+                dither = *(ditherY + ((x++)&BLUR_DITHER_MASK));
+                *fb++ = current.to(areaShift, k==repeat-1, dither);
+                in++;
+            } while (--count);
+
+            count = w-kernelSize;
+            do {
+                current += *in;
+                current -= *out;
+                dither = *(ditherY + ((x++)&BLUR_DITHER_MASK));
+                *fb++ = current.to(areaShift, k==repeat-1, dither);
+                in++, out++;
+            } while (--count);
+
+            count = kernelHalfSize;
+            do {
+                current -= *out;
+                dither = *(ditherY + ((x++)&BLUR_DITHER_MASK));
+                *fb++ = current.to(areaShift, k==repeat-1, dither);
+                out++;
+            } while (--count);
+
+            // vertical blur pass, subtract the oldest line from each columns
+            // and add a new line. Subtract or add zeros at the top
+            // and bottom edges.
+            TYPE* const tail = scratch + (y & mask) * src->stride;
+            if (y >= kernelHalfSize) {
+                for (int x=0 ; x<w ; x++)
+                    sums[x] -= PIXEL( tail[x] );
+            }
+            if (y < h-kernelSize) {
+                memcpy( tail,
+                        (TYPE*)src->data + (y+kernelHalfSize)*src->stride,
+                        src->stride*sizeof(TYPE));
+                for (int x=0 ; x<w ; x++)
+                    sums[x] += PIXEL( tail[x] );
+            }
+        }
+
+        // The subsequent passes are always done in-place.
+        src = dst;
+    }
+    
+    free(temporary_buffer);
+
+    return NO_ERROR;
+}
+
+template status_t blurFilter< BlurColor565<0x80> >(
+        GGLSurface const* dst,
+        GGLSurface const* src,
+        int kernelSizeUser,
+        int repeat);
+
+status_t blurFilter(
+        GGLSurface const* image,
+        int kernelSizeUser,
+        int repeat)
+{
+    status_t err = BAD_VALUE;
+    if (image->format == GGL_PIXEL_FORMAT_RGB_565) {
+        err = blurFilter< BlurColor565<0x80> >(image, image, kernelSizeUser, repeat);
+    } else if (image->format == GGL_PIXEL_FORMAT_RGBX_8888) {
+        err = blurFilter< BlurColor888X<0x80> >(image, image, kernelSizeUser, repeat);
+    }
+    return err;
+}
+
+} // namespace android
+
+//err = blur< BlurColor565<0x80> >(dst, src, kernelSizeUser, repeat);
+//err = blur<BlurGray565>(dst, src, kernelSizeUser, repeat);
+//err = blur<BlurGray8888>(dst, src, kernelSizeUser, repeat);
diff --git a/services/surfaceflinger/BlurFilter.h b/services/surfaceflinger/BlurFilter.h
new file mode 100644
index 0000000..294db43
--- /dev/null
+++ b/services/surfaceflinger/BlurFilter.h
@@ -0,0 +1,35 @@
+/* 
+**
+** Copyright 2006, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License"); 
+** you may not use this file except in compliance with the License. 
+** You may obtain a copy of the License at 
+**
+**     http://www.apache.org/licenses/LICENSE-2.0 
+**
+** Unless required by applicable law or agreed to in writing, software 
+** distributed under the License is distributed on an "AS IS" BASIS, 
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
+** See the License for the specific language governing permissions and 
+** limitations under the License.
+*/
+
+#ifndef ANDROID_BLUR_FILTER_H
+#define ANDROID_BLUR_FILTER_H
+
+#include <stdint.h>
+#include <utils/Errors.h>
+
+#include <pixelflinger/pixelflinger.h>
+
+namespace android {
+
+status_t blurFilter(
+        GGLSurface const* image,
+        int kernelSizeUser,
+        int repeat);
+
+} // namespace android
+
+#endif // ANDROID_BLUR_FILTER_H
diff --git a/services/surfaceflinger/DisplayHardware/DisplayHardware.cpp b/services/surfaceflinger/DisplayHardware/DisplayHardware.cpp
new file mode 100644
index 0000000..2eac0a8
--- /dev/null
+++ b/services/surfaceflinger/DisplayHardware/DisplayHardware.cpp
@@ -0,0 +1,336 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
+#include <cutils/properties.h>
+
+#include <utils/RefBase.h>
+#include <utils/Log.h>
+
+#include <ui/PixelFormat.h>
+#include <ui/FramebufferNativeWindow.h>
+#include <ui/EGLUtils.h>
+
+#include <GLES/gl.h>
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+
+#include <pixelflinger/pixelflinger.h>
+
+#include "DisplayHardware/DisplayHardware.h"
+
+#include <hardware/copybit.h>
+#include <hardware/overlay.h>
+#include <hardware/gralloc.h>
+
+#include "GLExtensions.h"
+
+using namespace android;
+
+
+static __attribute__((noinline))
+void checkGLErrors()
+{
+    do {
+        // there could be more than one error flag
+        GLenum error = glGetError();
+        if (error == GL_NO_ERROR)
+            break;
+        LOGE("GL error 0x%04x", int(error));
+    } while(true);
+}
+
+static __attribute__((noinline))
+void checkEGLErrors(const char* token)
+{
+    EGLint error = eglGetError();
+    if (error && error != EGL_SUCCESS) {
+        LOGE("%s: EGL error 0x%04x (%s)",
+                token, int(error), EGLUtils::strerror(error));
+    }
+}
+
+/*
+ * Initialize the display to the specified values.
+ *
+ */
+
+DisplayHardware::DisplayHardware(
+        const sp<SurfaceFlinger>& flinger,
+        uint32_t dpy)
+    : DisplayHardwareBase(flinger, dpy),
+      mFlags(0)
+{
+    init(dpy);
+}
+
+DisplayHardware::~DisplayHardware()
+{
+    fini();
+}
+
+float DisplayHardware::getDpiX() const          { return mDpiX; }
+float DisplayHardware::getDpiY() const          { return mDpiY; }
+float DisplayHardware::getDensity() const       { return mDensity; }
+float DisplayHardware::getRefreshRate() const   { return mRefreshRate; }
+int DisplayHardware::getWidth() const           { return mWidth; }
+int DisplayHardware::getHeight() const          { return mHeight; }
+PixelFormat DisplayHardware::getFormat() const  { return mFormat; }
+uint32_t DisplayHardware::getMaxTextureSize() const { return mMaxTextureSize; }
+uint32_t DisplayHardware::getMaxViewportDims() const { return mMaxViewportDims; }
+
+void DisplayHardware::init(uint32_t dpy)
+{
+    mNativeWindow = new FramebufferNativeWindow();
+    framebuffer_device_t const * fbDev = mNativeWindow->getDevice();
+    mDpiX = mNativeWindow->xdpi;
+    mDpiY = mNativeWindow->ydpi;
+    mRefreshRate = fbDev->fps;
+
+    mOverlayEngine = NULL;
+    hw_module_t const* module;
+    if (hw_get_module(OVERLAY_HARDWARE_MODULE_ID, &module) == 0) {
+        overlay_control_open(module, &mOverlayEngine);
+    }
+
+    EGLint w, h, dummy;
+    EGLint numConfigs=0;
+    EGLSurface surface;
+    EGLContext context;
+
+    // initialize EGL
+    EGLint attribs[] = {
+            EGL_SURFACE_TYPE,   EGL_WINDOW_BIT,
+            EGL_NONE,           0,
+            EGL_NONE
+    };
+
+    // debug: disable h/w rendering
+    char property[PROPERTY_VALUE_MAX];
+    if (property_get("debug.sf.hw", property, NULL) > 0) {
+        if (atoi(property) == 0) {
+            LOGW("H/W composition disabled");
+            attribs[2] = EGL_CONFIG_CAVEAT;
+            attribs[3] = EGL_SLOW_CONFIG;
+        }
+    }
+
+    // TODO: all the extensions below should be queried through
+    // eglGetProcAddress().
+
+    EGLDisplay display = eglGetDisplay(EGL_DEFAULT_DISPLAY);
+    eglInitialize(display, NULL, NULL);
+    eglGetConfigs(display, NULL, 0, &numConfigs);
+
+    EGLConfig config;
+    status_t err = EGLUtils::selectConfigForNativeWindow(
+            display, attribs, mNativeWindow.get(), &config);
+    LOGE_IF(err, "couldn't find an EGLConfig matching the screen format");
+    
+    EGLint r,g,b,a;
+    eglGetConfigAttrib(display, config, EGL_RED_SIZE,   &r);
+    eglGetConfigAttrib(display, config, EGL_GREEN_SIZE, &g);
+    eglGetConfigAttrib(display, config, EGL_BLUE_SIZE,  &b);
+    eglGetConfigAttrib(display, config, EGL_ALPHA_SIZE, &a);
+
+    if (mNativeWindow->isUpdateOnDemand()) {
+        mFlags |= PARTIAL_UPDATES;
+    }
+    
+    if (eglGetConfigAttrib(display, config, EGL_CONFIG_CAVEAT, &dummy) == EGL_TRUE) {
+        if (dummy == EGL_SLOW_CONFIG)
+            mFlags |= SLOW_CONFIG;
+    }
+
+    /*
+     * Create our main surface
+     */
+
+    surface = eglCreateWindowSurface(display, config, mNativeWindow.get(), NULL);
+    eglQuerySurface(display, surface, EGL_WIDTH,  &mWidth);
+    eglQuerySurface(display, surface, EGL_HEIGHT, &mHeight);
+
+    if (mFlags & PARTIAL_UPDATES) {
+        // if we have partial updates, we definitely don't need to
+        // preserve the backbuffer, which may be costly.
+        eglSurfaceAttrib(display, surface,
+                EGL_SWAP_BEHAVIOR, EGL_BUFFER_DESTROYED);
+    }
+
+    if (eglQuerySurface(display, surface, EGL_SWAP_BEHAVIOR, &dummy) == EGL_TRUE) {
+        if (dummy == EGL_BUFFER_PRESERVED) {
+            mFlags |= BUFFER_PRESERVED;
+        }
+    }
+    
+    /* Read density from build-specific ro.sf.lcd_density property
+     * except if it is overridden by qemu.sf.lcd_density.
+     */
+    if (property_get("qemu.sf.lcd_density", property, NULL) <= 0) {
+        if (property_get("ro.sf.lcd_density", property, NULL) <= 0) {
+            LOGW("ro.sf.lcd_density not defined, using 160 dpi by default.");
+            strcpy(property, "160");
+        }
+    } else {
+        /* for the emulator case, reset the dpi values too */
+        mDpiX = mDpiY = atoi(property);
+    }
+    mDensity = atoi(property) * (1.0f/160.0f);
+
+
+    /*
+     * Create our OpenGL ES context
+     */
+    
+    context = eglCreateContext(display, config, NULL, NULL);
+    
+    mDisplay = display;
+    mConfig  = config;
+    mSurface = surface;
+    mContext = context;
+    mFormat  = fbDev->format;
+    mPageFlipCount = 0;
+
+    /*
+     * Gather OpenGL ES extensions
+     */
+
+    eglMakeCurrent(display, surface, surface, context);
+
+    GLExtensions& extensions(GLExtensions::getInstance());
+    extensions.initWithGLStrings(
+            glGetString(GL_VENDOR),
+            glGetString(GL_RENDERER),
+            glGetString(GL_VERSION),
+            glGetString(GL_EXTENSIONS),
+            eglQueryString(display, EGL_VENDOR),
+            eglQueryString(display, EGL_VERSION),
+            eglQueryString(display, EGL_EXTENSIONS));
+
+    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
+    glGetIntegerv(GL_MAX_VIEWPORT_DIMS, &mMaxViewportDims);
+
+
+#ifdef EGL_ANDROID_swap_rectangle
+    if (extensions.hasExtension("EGL_ANDROID_swap_rectangle")) {
+        if (eglSetSwapRectangleANDROID(display, surface,
+                0, 0, mWidth, mHeight) == EGL_TRUE) {
+            // This could fail if this extension is not supported by this
+            // specific surface (of config)
+            mFlags |= SWAP_RECTANGLE;
+        }
+    }
+    // when we have the choice between PARTIAL_UPDATES and SWAP_RECTANGLE
+    // choose PARTIAL_UPDATES, which should be more efficient
+    if (mFlags & PARTIAL_UPDATES)
+        mFlags &= ~SWAP_RECTANGLE;
+#endif
+
+    LOGI("EGL informations:");
+    LOGI("# of configs : %d", numConfigs);
+    LOGI("vendor    : %s", extensions.getEglVendor());
+    LOGI("version   : %s", extensions.getEglVersion());
+    LOGI("extensions: %s", extensions.getEglExtension());
+    LOGI("Client API: %s", eglQueryString(display, EGL_CLIENT_APIS)?:"Not Supported");
+    LOGI("EGLSurface: %d-%d-%d-%d, config=%p", r, g, b, a, config);
+
+    LOGI("OpenGL informations:");
+    LOGI("vendor    : %s", extensions.getVendor());
+    LOGI("renderer  : %s", extensions.getRenderer());
+    LOGI("version   : %s", extensions.getVersion());
+    LOGI("extensions: %s", extensions.getExtension());
+    LOGI("GL_MAX_TEXTURE_SIZE = %d", mMaxTextureSize);
+    LOGI("GL_MAX_VIEWPORT_DIMS = %d", mMaxViewportDims);
+    LOGI("flags = %08x", mFlags);
+
+    // Unbind the context from this thread
+    eglMakeCurrent(display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+}
+
+/*
+ * Clean up.  Throw out our local state.
+ *
+ * (It's entirely possible we'll never get here, since this is meant
+ * for real hardware, which doesn't restart.)
+ */
+
+void DisplayHardware::fini()
+{
+    eglMakeCurrent(mDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+    eglTerminate(mDisplay);
+    overlay_control_close(mOverlayEngine);
+}
+
+void DisplayHardware::releaseScreen() const
+{
+    DisplayHardwareBase::releaseScreen();
+}
+
+void DisplayHardware::acquireScreen() const
+{
+    DisplayHardwareBase::acquireScreen();
+}
+
+uint32_t DisplayHardware::getPageFlipCount() const {
+    return mPageFlipCount;
+}
+
+status_t DisplayHardware::compositionComplete() const {
+    return mNativeWindow->compositionComplete();
+}
+
+void DisplayHardware::flip(const Region& dirty) const
+{
+    checkGLErrors();
+
+    EGLDisplay dpy = mDisplay;
+    EGLSurface surface = mSurface;
+
+#ifdef EGL_ANDROID_swap_rectangle    
+    if (mFlags & SWAP_RECTANGLE) {
+        const Region newDirty(dirty.intersect(bounds()));
+        const Rect b(newDirty.getBounds());
+        eglSetSwapRectangleANDROID(dpy, surface,
+                b.left, b.top, b.width(), b.height());
+    } 
+#endif
+    
+    if (mFlags & PARTIAL_UPDATES) {
+        mNativeWindow->setUpdateRectangle(dirty.getBounds());
+    }
+    
+    mPageFlipCount++;
+    eglSwapBuffers(dpy, surface);
+    checkEGLErrors("eglSwapBuffers");
+
+    // for debugging
+    //glClearColor(1,0,0,0);
+    //glClear(GL_COLOR_BUFFER_BIT);
+}
+
+uint32_t DisplayHardware::getFlags() const
+{
+    return mFlags;
+}
+
+void DisplayHardware::makeCurrent() const
+{
+    eglMakeCurrent(mDisplay, mSurface, mSurface, mContext);
+}
diff --git a/services/surfaceflinger/DisplayHardware/DisplayHardware.h b/services/surfaceflinger/DisplayHardware/DisplayHardware.h
new file mode 100644
index 0000000..66bf521
--- /dev/null
+++ b/services/surfaceflinger/DisplayHardware/DisplayHardware.h
@@ -0,0 +1,116 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_DISPLAY_HARDWARE_H
+#define ANDROID_DISPLAY_HARDWARE_H
+
+#include <stdlib.h>
+
+#include <ui/PixelFormat.h>
+#include <ui/Region.h>
+
+#include <GLES/gl.h>
+#include <GLES/glext.h>
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+
+#include <pixelflinger/pixelflinger.h>
+
+#include "GLExtensions.h"
+
+#include "DisplayHardware/DisplayHardwareBase.h"
+
+struct overlay_control_device_t;
+struct framebuffer_device_t;
+struct copybit_image_t;
+
+namespace android {
+
+class FramebufferNativeWindow;
+
+class DisplayHardware : public DisplayHardwareBase
+{
+public:
+    enum {
+        COPY_BITS_EXTENSION         = 0x00000008,
+        BUFFER_PRESERVED            = 0x00010000,
+        PARTIAL_UPDATES             = 0x00020000,   // video driver feature
+        SLOW_CONFIG                 = 0x00040000,   // software
+        SWAP_RECTANGLE              = 0x00080000,
+    };
+
+    DisplayHardware(
+            const sp<SurfaceFlinger>& flinger,
+            uint32_t displayIndex);
+
+    ~DisplayHardware();
+
+    void releaseScreen() const;
+    void acquireScreen() const;
+
+    // Flip the front and back buffers if the back buffer is "dirty".  Might
+    // be instantaneous, might involve copying the frame buffer around.
+    void flip(const Region& dirty) const;
+
+    float       getDpiX() const;
+    float       getDpiY() const;
+    float       getRefreshRate() const;
+    float       getDensity() const;
+    int         getWidth() const;
+    int         getHeight() const;
+    PixelFormat getFormat() const;
+    uint32_t    getFlags() const;
+    void        makeCurrent() const;
+    uint32_t    getMaxTextureSize() const;
+    uint32_t    getMaxViewportDims() const;
+
+    uint32_t getPageFlipCount() const;
+    EGLDisplay getEGLDisplay() const { return mDisplay; }
+    overlay_control_device_t* getOverlayEngine() const { return mOverlayEngine; }
+    
+    status_t compositionComplete() const;
+    
+    Rect bounds() const {
+        return Rect(mWidth, mHeight);
+    }
+
+private:
+    void init(uint32_t displayIndex) __attribute__((noinline));
+    void fini() __attribute__((noinline));
+
+    EGLDisplay      mDisplay;
+    EGLSurface      mSurface;
+    EGLContext      mContext;
+    EGLConfig       mConfig;
+    float           mDpiX;
+    float           mDpiY;
+    float           mRefreshRate;
+    float           mDensity;
+    int             mWidth;
+    int             mHeight;
+    PixelFormat     mFormat;
+    uint32_t        mFlags;
+    mutable uint32_t mPageFlipCount;
+    GLint           mMaxViewportDims;
+    GLint           mMaxTextureSize;
+    
+    sp<FramebufferNativeWindow> mNativeWindow;
+    overlay_control_device_t* mOverlayEngine;
+};
+
+}; // namespace android
+
+#endif // ANDROID_DISPLAY_HARDWARE_H
diff --git a/services/surfaceflinger/DisplayHardware/DisplayHardwareBase.cpp b/services/surfaceflinger/DisplayHardware/DisplayHardwareBase.cpp
new file mode 100644
index 0000000..1d09f84
--- /dev/null
+++ b/services/surfaceflinger/DisplayHardware/DisplayHardwareBase.cpp
@@ -0,0 +1,401 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <termios.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/resource.h>
+
+#include <linux/unistd.h>
+
+#include <utils/Log.h>
+
+#include "DisplayHardware/DisplayHardwareBase.h"
+#include "SurfaceFlinger.h"
+
+// ----------------------------------------------------------------------------
+// the sim build doesn't have gettid
+
+#ifndef HAVE_GETTID
+# define gettid getpid
+#endif
+
+// ----------------------------------------------------------------------------
+namespace android {
+
+static char const * kSleepFileName = "/sys/power/wait_for_fb_sleep";
+static char const * kWakeFileName = "/sys/power/wait_for_fb_wake";
+static char const * const kOldSleepFileName = "/sys/android_power/wait_for_fb_sleep";
+static char const * const kOldWakeFileName = "/sys/android_power/wait_for_fb_wake";
+
+// This dir exists if the framebuffer console is present, either built into
+// the kernel or loaded as a module.
+static char const * const kFbconSysDir = "/sys/class/graphics/fbcon";
+
+// ----------------------------------------------------------------------------
+
+DisplayHardwareBase::DisplayEventThreadBase::DisplayEventThreadBase(
+        const sp<SurfaceFlinger>& flinger)
+    : Thread(false), mFlinger(flinger) {
+}
+
+DisplayHardwareBase::DisplayEventThreadBase::~DisplayEventThreadBase() {
+}
+
+// ----------------------------------------------------------------------------
+
+DisplayHardwareBase::DisplayEventThread::DisplayEventThread(
+        const sp<SurfaceFlinger>& flinger)
+    : DisplayEventThreadBase(flinger)
+{
+}
+
+DisplayHardwareBase::DisplayEventThread::~DisplayEventThread()
+{
+}
+
+bool DisplayHardwareBase::DisplayEventThread::threadLoop()
+{
+    int err = 0;
+    char buf;
+    int fd;
+
+    fd = open(kSleepFileName, O_RDONLY, 0);
+    do {
+      err = read(fd, &buf, 1);
+    } while (err < 0 && errno == EINTR);
+    close(fd);
+    LOGW_IF(err<0, "ANDROID_WAIT_FOR_FB_SLEEP failed (%s)", strerror(errno));
+    if (err >= 0) {
+        sp<SurfaceFlinger> flinger = mFlinger.promote();
+        LOGD("About to give-up screen, flinger = %p", flinger.get());
+        if (flinger != 0) {
+            mBarrier.close();
+            flinger->screenReleased(0);
+            mBarrier.wait();
+        }
+    }
+    fd = open(kWakeFileName, O_RDONLY, 0);
+    do {
+      err = read(fd, &buf, 1);
+    } while (err < 0 && errno == EINTR);
+    close(fd);
+    LOGW_IF(err<0, "ANDROID_WAIT_FOR_FB_WAKE failed (%s)", strerror(errno));
+    if (err >= 0) {
+        sp<SurfaceFlinger> flinger = mFlinger.promote();
+        LOGD("Screen about to return, flinger = %p", flinger.get());
+        if (flinger != 0)
+            flinger->screenAcquired(0);
+    }
+    return true;
+}
+
+status_t DisplayHardwareBase::DisplayEventThread::releaseScreen() const
+{
+    mBarrier.open();
+    return NO_ERROR;
+}
+
+status_t DisplayHardwareBase::DisplayEventThread::readyToRun()
+{
+    if (access(kSleepFileName, R_OK) || access(kWakeFileName, R_OK)) {
+        if (access(kOldSleepFileName, R_OK) || access(kOldWakeFileName, R_OK)) {
+            LOGE("Couldn't open %s or %s", kSleepFileName, kWakeFileName);
+            return NO_INIT;
+        }
+        kSleepFileName = kOldSleepFileName;
+        kWakeFileName = kOldWakeFileName;
+    }
+    return NO_ERROR;
+}
+
+status_t DisplayHardwareBase::DisplayEventThread::initCheck() const
+{
+    return (((access(kSleepFileName, R_OK) == 0 &&
+            access(kWakeFileName, R_OK) == 0) ||
+            (access(kOldSleepFileName, R_OK) == 0 &&
+            access(kOldWakeFileName, R_OK) == 0)) &&
+            access(kFbconSysDir, F_OK) != 0) ? NO_ERROR : NO_INIT;
+}
+
+// ----------------------------------------------------------------------------
+
+pid_t DisplayHardwareBase::ConsoleManagerThread::sSignalCatcherPid = 0;
+
+DisplayHardwareBase::ConsoleManagerThread::ConsoleManagerThread(
+        const sp<SurfaceFlinger>& flinger)
+    : DisplayEventThreadBase(flinger), consoleFd(-1)
+{   
+    sSignalCatcherPid = 0;
+
+    // create a new console
+    char const * const ttydev = "/dev/tty0";
+    int fd = open(ttydev, O_RDWR | O_SYNC);
+    if (fd<0) {
+        LOGE("Can't open %s", ttydev);
+        this->consoleFd = -errno;
+        return;
+    }
+
+    // to make sure that we are in text mode
+    int res = ioctl(fd, KDSETMODE, (void*) KD_TEXT);
+    if (res<0) {
+        LOGE("ioctl(%d, KDSETMODE, ...) failed, res %d (%s)",
+                fd, res, strerror(errno));
+    }
+    
+    // get the current console
+    struct vt_stat vs;
+    res = ioctl(fd, VT_GETSTATE, &vs);
+    if (res<0) {
+        LOGE("ioctl(%d, VT_GETSTATE, ...) failed, res %d (%s)",
+                fd, res, strerror(errno));
+        this->consoleFd = -errno;
+        return;
+    }
+
+    // switch to console 7 (which is what X normaly uses)
+    int vtnum = 7;
+    do {
+        res = ioctl(fd, VT_ACTIVATE, (void*)vtnum);
+    } while(res < 0 && errno == EINTR);
+    if (res<0) {
+        LOGE("ioctl(%d, VT_ACTIVATE, ...) failed, %d (%s) for %d",
+                fd, errno, strerror(errno), vtnum);
+        this->consoleFd = -errno;
+        return;
+    }
+
+    do {
+        res = ioctl(fd, VT_WAITACTIVE, (void*)vtnum);
+    } while(res < 0 && errno == EINTR);
+    if (res<0) {
+        LOGE("ioctl(%d, VT_WAITACTIVE, ...) failed, %d %d %s for %d",
+                fd, res, errno, strerror(errno), vtnum);
+        this->consoleFd = -errno;
+        return;
+    }
+
+    // open the new console
+    close(fd);
+    fd = open(ttydev, O_RDWR | O_SYNC);
+    if (fd<0) {
+        LOGE("Can't open new console %s", ttydev);
+        this->consoleFd = -errno;
+        return;
+    }
+
+    /* disable console line buffer, echo, ... */
+    struct termios ttyarg;
+    ioctl(fd, TCGETS , &ttyarg);
+    ttyarg.c_iflag = 0;
+    ttyarg.c_lflag = 0;
+    ioctl(fd, TCSETS , &ttyarg);
+
+    // set up signals so we're notified when the console changes
+    // we can't use SIGUSR1 because it's used by the java-vm
+    vm.mode = VT_PROCESS;
+    vm.waitv = 0;
+    vm.relsig = SIGUSR2;
+    vm.acqsig = SIGUNUSED;
+    vm.frsig = 0;
+
+    struct sigaction act;
+    sigemptyset(&act.sa_mask);
+    act.sa_handler = sigHandler;
+    act.sa_flags = 0;
+    sigaction(vm.relsig, &act, NULL);
+
+    sigemptyset(&act.sa_mask);
+    act.sa_handler = sigHandler;
+    act.sa_flags = 0;
+    sigaction(vm.acqsig, &act, NULL);
+
+    sigset_t mask;
+    sigemptyset(&mask);
+    sigaddset(&mask, vm.relsig);
+    sigaddset(&mask, vm.acqsig);
+    sigprocmask(SIG_BLOCK, &mask, NULL);
+
+    // switch to graphic mode
+    res = ioctl(fd, KDSETMODE, (void*)KD_GRAPHICS);
+    LOGW_IF(res<0,
+            "ioctl(%d, KDSETMODE, KD_GRAPHICS) failed, res %d", fd, res);
+
+    this->prev_vt_num = vs.v_active;
+    this->vt_num = vtnum;
+    this->consoleFd = fd;
+}
+
+DisplayHardwareBase::ConsoleManagerThread::~ConsoleManagerThread()
+{   
+    if (this->consoleFd >= 0) {
+        int fd = this->consoleFd;
+        int prev_vt_num = this->prev_vt_num;
+        int res;
+        ioctl(fd, KDSETMODE, (void*)KD_TEXT);
+        do {
+            res = ioctl(fd, VT_ACTIVATE, (void*)prev_vt_num);
+        } while(res < 0 && errno == EINTR);
+        do {
+            res = ioctl(fd, VT_WAITACTIVE, (void*)prev_vt_num);
+        } while(res < 0 && errno == EINTR);
+        close(fd);    
+        char const * const ttydev = "/dev/tty0";
+        fd = open(ttydev, O_RDWR | O_SYNC);
+        ioctl(fd, VT_DISALLOCATE, 0);
+        close(fd);
+    }
+}
+
+status_t DisplayHardwareBase::ConsoleManagerThread::readyToRun()
+{
+    if (this->consoleFd >= 0) {
+        sSignalCatcherPid = gettid();
+        
+        sigset_t mask;
+        sigemptyset(&mask);
+        sigaddset(&mask, vm.relsig);
+        sigaddset(&mask, vm.acqsig);
+        sigprocmask(SIG_BLOCK, &mask, NULL);
+
+        int res = ioctl(this->consoleFd, VT_SETMODE, &vm);
+        if (res<0) {
+            LOGE("ioctl(%d, VT_SETMODE, ...) failed, %d (%s)",
+                    this->consoleFd, errno, strerror(errno));
+        }
+        return NO_ERROR;
+    }
+    return this->consoleFd;
+}
+
+void DisplayHardwareBase::ConsoleManagerThread::requestExit()
+{
+    Thread::requestExit();
+    if (sSignalCatcherPid != 0) {
+        // wake the thread up
+        kill(sSignalCatcherPid, SIGINT);
+        // wait for it...
+    }
+}
+
+void DisplayHardwareBase::ConsoleManagerThread::sigHandler(int sig)
+{
+    // resend the signal to our signal catcher thread
+    LOGW("received signal %d in thread %d, resending to %d",
+            sig, gettid(), sSignalCatcherPid);
+
+    // we absolutely need the delays below because without them
+    // our main thread never gets a chance to handle the signal.
+    usleep(10000);
+    kill(sSignalCatcherPid, sig);
+    usleep(10000);
+}
+
+status_t DisplayHardwareBase::ConsoleManagerThread::releaseScreen() const
+{
+    int fd = this->consoleFd;
+    int err = ioctl(fd, VT_RELDISP, (void*)1);
+    LOGE_IF(err<0, "ioctl(%d, VT_RELDISP, 1) failed %d (%s)",
+        fd, errno, strerror(errno));
+    return (err<0) ? (-errno) : status_t(NO_ERROR);
+}
+
+bool DisplayHardwareBase::ConsoleManagerThread::threadLoop()
+{
+    sigset_t mask;
+    sigemptyset(&mask);
+    sigaddset(&mask, vm.relsig);
+    sigaddset(&mask, vm.acqsig);
+
+    int sig = 0;
+    sigwait(&mask, &sig);
+
+    if (sig == vm.relsig) {
+        sp<SurfaceFlinger> flinger = mFlinger.promote();
+        //LOGD("About to give-up screen, flinger = %p", flinger.get());
+        if (flinger != 0)
+            flinger->screenReleased(0);
+    } else if (sig == vm.acqsig) {
+        sp<SurfaceFlinger> flinger = mFlinger.promote();
+        //LOGD("Screen about to return, flinger = %p", flinger.get());
+        if (flinger != 0) 
+            flinger->screenAcquired(0);
+    }
+    
+    return true;
+}
+
+status_t DisplayHardwareBase::ConsoleManagerThread::initCheck() const
+{
+    return consoleFd >= 0 ? NO_ERROR : NO_INIT;
+}
+
+// ----------------------------------------------------------------------------
+
+DisplayHardwareBase::DisplayHardwareBase(const sp<SurfaceFlinger>& flinger,
+        uint32_t displayIndex) 
+    : mCanDraw(true)
+{
+    mDisplayEventThread = new DisplayEventThread(flinger);
+    if (mDisplayEventThread->initCheck() != NO_ERROR) {
+        // fall-back on the console
+        mDisplayEventThread = new ConsoleManagerThread(flinger);
+    }
+}
+
+DisplayHardwareBase::~DisplayHardwareBase()
+{
+    // request exit
+    mDisplayEventThread->requestExitAndWait();
+}
+
+
+bool DisplayHardwareBase::canDraw() const
+{
+    return mCanDraw;
+}
+
+void DisplayHardwareBase::releaseScreen() const
+{
+    status_t err = mDisplayEventThread->releaseScreen();
+    if (err >= 0) {
+        //LOGD("screen given-up");
+        mCanDraw = false;
+    }
+}
+
+void DisplayHardwareBase::acquireScreen() const
+{
+    status_t err = mDisplayEventThread->acquireScreen();
+    if (err >= 0) {
+        //LOGD("screen returned");
+        mCanDraw = true;
+    }
+}
+
+}; // namespace android
diff --git a/services/surfaceflinger/DisplayHardware/DisplayHardwareBase.h b/services/surfaceflinger/DisplayHardware/DisplayHardwareBase.h
new file mode 100644
index 0000000..8369bb8
--- /dev/null
+++ b/services/surfaceflinger/DisplayHardware/DisplayHardwareBase.h
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_DISPLAY_HARDWARE_BASE_H
+#define ANDROID_DISPLAY_HARDWARE_BASE_H
+
+#include <stdint.h>
+#include <utils/RefBase.h>
+#include <utils/threads.h>
+#include <linux/kd.h>
+#include <linux/vt.h>
+#include "Barrier.h"
+
+namespace android {
+
+class SurfaceFlinger; 
+
+class DisplayHardwareBase
+{
+public:
+                DisplayHardwareBase(
+                        const sp<SurfaceFlinger>& flinger,
+                        uint32_t displayIndex);
+
+                ~DisplayHardwareBase();
+
+    // console managment
+    void releaseScreen() const;
+    void acquireScreen() const;
+    bool canDraw() const;
+
+private:
+    class DisplayEventThreadBase : public Thread {
+    protected:
+        wp<SurfaceFlinger> mFlinger;
+    public:
+        DisplayEventThreadBase(const sp<SurfaceFlinger>& flinger);
+        virtual ~DisplayEventThreadBase();
+        virtual void onFirstRef() {
+            run("DisplayEventThread", PRIORITY_URGENT_DISPLAY);
+        }
+        virtual status_t acquireScreen() const { return NO_ERROR; };
+        virtual status_t releaseScreen() const { return NO_ERROR; };
+        virtual status_t initCheck() const = 0;
+    };
+
+    class DisplayEventThread : public DisplayEventThreadBase 
+    {
+        mutable Barrier mBarrier;
+    public:
+                DisplayEventThread(const sp<SurfaceFlinger>& flinger);
+        virtual ~DisplayEventThread();
+        virtual bool threadLoop();
+        virtual status_t readyToRun();
+        virtual status_t releaseScreen() const;
+        virtual status_t initCheck() const;
+    };
+
+    class ConsoleManagerThread : public DisplayEventThreadBase 
+    {
+        int consoleFd;
+        int vt_num;
+        int prev_vt_num;
+        vt_mode vm;
+        static void sigHandler(int sig);
+        static pid_t sSignalCatcherPid;
+    public:
+                ConsoleManagerThread(const sp<SurfaceFlinger>& flinger);
+        virtual ~ConsoleManagerThread();
+        virtual bool threadLoop();
+        virtual status_t readyToRun();
+        virtual void requestExit();
+        virtual status_t releaseScreen() const;
+        virtual status_t initCheck() const;
+    };
+
+    sp<DisplayEventThreadBase>  mDisplayEventThread;
+    mutable int                 mCanDraw;
+};
+
+}; // namespace android
+
+#endif // ANDROID_DISPLAY_HARDWARE_BASE_H
diff --git a/services/surfaceflinger/GLExtensions.cpp b/services/surfaceflinger/GLExtensions.cpp
new file mode 100644
index 0000000..7f4f9fc
--- /dev/null
+++ b/services/surfaceflinger/GLExtensions.cpp
@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+
+#include "GLExtensions.h"
+
+namespace android {
+// ---------------------------------------------------------------------------
+
+ANDROID_SINGLETON_STATIC_INSTANCE( GLExtensions )
+
+GLExtensions::GLExtensions()
+    : mHaveTextureExternal(false),
+      mHaveNpot(false),
+      mHaveDirectTexture(false)
+{
+}
+
+void GLExtensions::initWithGLStrings(
+        GLubyte const* vendor,
+        GLubyte const* renderer,
+        GLubyte const* version,
+        GLubyte const* extensions,
+        char const* egl_vendor,
+        char const* egl_version,
+        char const* egl_extensions)
+{
+    mVendor     = (char const*)vendor;
+    mRenderer   = (char const*)renderer;
+    mVersion    = (char const*)version;
+    mExtensions = (char const*)extensions;
+    mEglVendor     = egl_vendor;
+    mEglVersion    = egl_version;
+    mEglExtensions = egl_extensions;
+
+    char const* curr = (char const*)extensions;
+    char const* head = curr;
+    do {
+        head = strchr(curr, ' ');
+        String8 s(curr, head ? head-curr : strlen(curr));
+        if (s.length()) {
+            mExtensionList.add(s);
+        }
+        curr = head+1;
+    } while (head);
+
+    curr = egl_extensions;
+    head = curr;
+    do {
+        head = strchr(curr, ' ');
+        String8 s(curr, head ? head-curr : strlen(curr));
+        if (s.length()) {
+            mExtensionList.add(s);
+        }
+        curr = head+1;
+    } while (head);
+
+#ifdef EGL_ANDROID_image_native_buffer
+    if (hasExtension("GL_OES_EGL_image") &&
+        (hasExtension("EGL_KHR_image_base") || hasExtension("EGL_KHR_image")) &&
+        hasExtension("EGL_ANDROID_image_native_buffer"))
+    {
+        mHaveDirectTexture = true;
+    }
+#else
+#warning "EGL_ANDROID_image_native_buffer not supported"
+#endif
+
+    if (hasExtension("GL_ARB_texture_non_power_of_two")) {
+        mHaveNpot = true;
+    }
+
+    if (hasExtension("GL_OES_texture_external")) {
+        mHaveTextureExternal = true;
+    } else if (strstr(mRenderer.string(), "Adreno")) {
+        // hack for Adreno 200
+        mHaveTextureExternal = true;
+    }
+}
+
+bool GLExtensions::hasExtension(char const* extension) const
+{
+    const String8 s(extension);
+    return mExtensionList.indexOf(s) >= 0;
+}
+
+char const* GLExtensions::getVendor() const {
+    return mVendor.string();
+}
+
+char const* GLExtensions::getRenderer() const {
+    return mRenderer.string();
+}
+
+char const* GLExtensions::getVersion() const {
+    return mVersion.string();
+}
+
+char const* GLExtensions::getExtension() const {
+    return mExtensions.string();
+}
+
+char const* GLExtensions::getEglVendor() const {
+    return mEglVendor.string();
+}
+
+char const* GLExtensions::getEglVersion() const {
+    return mEglVersion.string();
+}
+
+char const* GLExtensions::getEglExtension() const {
+    return mEglExtensions.string();
+}
+
+
+// ---------------------------------------------------------------------------
+}; // namespace android
diff --git a/services/surfaceflinger/GLExtensions.h b/services/surfaceflinger/GLExtensions.h
new file mode 100644
index 0000000..bbb284e
--- /dev/null
+++ b/services/surfaceflinger/GLExtensions.h
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_SF_GLEXTENSION_H
+#define ANDROID_SF_GLEXTENSION_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <utils/String8.h>
+#include <utils/SortedVector.h>
+#include <utils/Singleton.h>
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <GLES/gl.h>
+#include <GLES/glext.h>
+
+namespace android {
+// ---------------------------------------------------------------------------
+
+class GLExtensions : public Singleton<GLExtensions>
+{
+    friend class Singleton<GLExtensions>;
+
+    bool mHaveTextureExternal   : 1;
+    bool mHaveNpot              : 1;
+    bool mHaveDirectTexture     : 1;
+
+    String8 mVendor;
+    String8 mRenderer;
+    String8 mVersion;
+    String8 mExtensions;
+    String8 mEglVendor;
+    String8 mEglVersion;
+    String8 mEglExtensions;
+    SortedVector<String8> mExtensionList;
+
+    GLExtensions(const GLExtensions&);
+    GLExtensions& operator = (const GLExtensions&);
+
+protected:
+    GLExtensions();
+
+public:
+    inline bool haveTextureExternal() const {
+        return mHaveTextureExternal;
+    }
+    inline bool haveNpot() const {
+        return mHaveNpot;
+    }
+    inline bool haveDirectTexture() const {
+        return mHaveDirectTexture;
+    }
+
+    void initWithGLStrings(
+            GLubyte const* vendor,
+            GLubyte const* renderer,
+            GLubyte const* version,
+            GLubyte const* extensions,
+            char const* egl_vendor,
+            char const* egl_version,
+            char const* egl_extensions);
+
+    char const* getVendor() const;
+    char const* getRenderer() const;
+    char const* getVersion() const;
+    char const* getExtension() const;
+
+    char const* getEglVendor() const;
+    char const* getEglVersion() const;
+    char const* getEglExtension() const;
+
+    bool hasExtension(char const* extension) const;
+};
+
+
+// ---------------------------------------------------------------------------
+}; // namespace android
+
+#endif // ANDROID_SF_GLEXTENSION_H
diff --git a/services/surfaceflinger/Layer.cpp b/services/surfaceflinger/Layer.cpp
new file mode 100644
index 0000000..758da4e
--- /dev/null
+++ b/services/surfaceflinger/Layer.cpp
@@ -0,0 +1,875 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <cutils/properties.h>
+#include <cutils/native_handle.h>
+
+#include <utils/Errors.h>
+#include <utils/Log.h>
+#include <utils/StopWatch.h>
+
+#include <ui/GraphicBuffer.h>
+#include <ui/PixelFormat.h>
+
+#include <surfaceflinger/Surface.h>
+
+#include "clz.h"
+#include "GLExtensions.h"
+#include "Layer.h"
+#include "SurfaceFlinger.h"
+#include "DisplayHardware/DisplayHardware.h"
+
+
+#define DEBUG_RESIZE    0
+
+
+namespace android {
+
+template <typename T> inline T min(T a, T b) {
+    return a<b ? a : b;
+}
+
+// ---------------------------------------------------------------------------
+
+Layer::Layer(SurfaceFlinger* flinger,
+        DisplayID display, const sp<Client>& client)
+    :   LayerBaseClient(flinger, display, client),
+        mGLExtensions(GLExtensions::getInstance()),
+        mNeedsBlending(true),
+        mNeedsDithering(false),
+        mSecure(false),
+        mTextureManager(),
+        mBufferManager(mTextureManager),
+        mWidth(0), mHeight(0), mFixedSize(false)
+{
+}
+
+Layer::~Layer()
+{
+    // FIXME: must be called from the main UI thread
+    EGLDisplay dpy(mFlinger->graphicPlane(0).getEGLDisplay());
+    mBufferManager.destroy(dpy);
+
+    // we can use getUserClientUnsafe here because we know we're
+    // single-threaded at that point.
+    sp<UserClient> ourClient(mUserClientRef.getUserClientUnsafe());
+    if (ourClient != 0) {
+        ourClient->detachLayer(this);
+    }
+}
+
+status_t Layer::setToken(const sp<UserClient>& userClient,
+        SharedClient* sharedClient, int32_t token)
+{
+    sp<SharedBufferServer> lcblk = new SharedBufferServer(
+            sharedClient, token, mBufferManager.getDefaultBufferCount(),
+            getIdentity());
+
+    status_t err = mUserClientRef.setToken(userClient, lcblk, token);
+
+    LOGE_IF(err != NO_ERROR,
+            "ClientRef::setToken(%p, %p, %u) failed",
+            userClient.get(), lcblk.get(), token);
+
+    if (err == NO_ERROR) {
+        // we need to free the buffers associated with this surface
+    }
+
+    return err;
+}
+
+int32_t Layer::getToken() const
+{
+    return mUserClientRef.getToken();
+}
+
+sp<UserClient> Layer::getClient() const
+{
+    return mUserClientRef.getClient();
+}
+
+// called with SurfaceFlinger::mStateLock as soon as the layer is entered
+// in the purgatory list
+void Layer::onRemoved()
+{
+    ClientRef::Access sharedClient(mUserClientRef);
+    SharedBufferServer* lcblk(sharedClient.get());
+    if (lcblk) {
+        // wake up the condition
+        lcblk->setStatus(NO_INIT);
+    }
+}
+
+sp<LayerBaseClient::Surface> Layer::createSurface() const
+{
+    return mSurface;
+}
+
+status_t Layer::ditch()
+{
+    // NOTE: Called from the main UI thread
+
+    // the layer is not on screen anymore. free as much resources as possible
+    mFreezeLock.clear();
+
+    EGLDisplay dpy(mFlinger->graphicPlane(0).getEGLDisplay());
+    mBufferManager.destroy(dpy);
+    mSurface.clear();
+
+    Mutex::Autolock _l(mLock);
+    mWidth = mHeight = 0;
+    return NO_ERROR;
+}
+
+status_t Layer::setBuffers( uint32_t w, uint32_t h,
+                            PixelFormat format, uint32_t flags)
+{
+    // this surfaces pixel format
+    PixelFormatInfo info;
+    status_t err = getPixelFormatInfo(format, &info);
+    if (err) return err;
+
+    // the display's pixel format
+    const DisplayHardware& hw(graphicPlane(0).displayHardware());
+    uint32_t const maxSurfaceDims = min(
+            hw.getMaxTextureSize(), hw.getMaxViewportDims());
+
+    // never allow a surface larger than what our underlying GL implementation
+    // can handle.
+    if ((uint32_t(w)>maxSurfaceDims) || (uint32_t(h)>maxSurfaceDims)) {
+        return BAD_VALUE;
+    }
+
+    PixelFormatInfo displayInfo;
+    getPixelFormatInfo(hw.getFormat(), &displayInfo);
+    const uint32_t hwFlags = hw.getFlags();
+    
+    mFormat = format;
+    mReqFormat = format;
+    mWidth  = w;
+    mHeight = h;
+    mSecure = (flags & ISurfaceComposer::eSecure) ? true : false;
+    mNeedsBlending = (info.h_alpha - info.l_alpha) > 0;
+
+    // we use the red index
+    int displayRedSize = displayInfo.getSize(PixelFormatInfo::INDEX_RED);
+    int layerRedsize = info.getSize(PixelFormatInfo::INDEX_RED);
+    mNeedsDithering = layerRedsize > displayRedSize;
+
+    mSurface = new SurfaceLayer(mFlinger, this);
+    return NO_ERROR;
+}
+
+void Layer::reloadTexture(const Region& dirty)
+{
+    sp<GraphicBuffer> buffer(mBufferManager.getActiveBuffer());
+    if (buffer == NULL) {
+        // this situation can happen if we ran out of memory for instance.
+        // not much we can do. continue to use whatever texture was bound
+        // to this context.
+        return;
+    }
+
+    if (mGLExtensions.haveDirectTexture()) {
+        EGLDisplay dpy(mFlinger->graphicPlane(0).getEGLDisplay());
+        if (mBufferManager.initEglImage(dpy, buffer) != NO_ERROR) {
+            // not sure what we can do here...
+            goto slowpath;
+        }
+    } else {
+slowpath:
+        GGLSurface t;
+        status_t res = buffer->lock(&t, GRALLOC_USAGE_SW_READ_OFTEN);
+        LOGE_IF(res, "error %d (%s) locking buffer %p",
+                res, strerror(res), buffer.get());
+        if (res == NO_ERROR) {
+            mBufferManager.loadTexture(dirty, t);
+            buffer->unlock();
+        }
+    }
+}
+
+void Layer::onDraw(const Region& clip) const
+{
+    Texture tex(mBufferManager.getActiveTexture());
+    if (tex.name == -1LU) {
+        // the texture has not been created yet, this Layer has
+        // in fact never been drawn into. This happens frequently with
+        // SurfaceView because the WindowManager can't know when the client
+        // has drawn the first time.
+
+        // If there is nothing under us, we paint the screen in black, otherwise
+        // we just skip this update.
+
+        // figure out if there is something below us
+        Region under;
+        const SurfaceFlinger::LayerVector& drawingLayers(mFlinger->mDrawingState.layersSortedByZ);
+        const size_t count = drawingLayers.size();
+        for (size_t i=0 ; i<count ; ++i) {
+            const sp<LayerBase>& layer(drawingLayers[i]);
+            if (layer.get() == static_cast<LayerBase const*>(this))
+                break;
+            under.orSelf(layer->visibleRegionScreen);
+        }
+        // if not everything below us is covered, we plug the holes!
+        Region holes(clip.subtract(under));
+        if (!holes.isEmpty()) {
+            clearWithOpenGL(holes, 0, 0, 0, 1);
+        }
+        return;
+    }
+    drawWithOpenGL(clip, tex);
+}
+
+bool Layer::needsFiltering() const
+{
+    if (!(mFlags & DisplayHardware::SLOW_CONFIG)) {
+        // NOTE: there is a race here, because mFixedSize is updated in a
+        // binder transaction. however, it doesn't really matter since it is
+        // evaluated each time we draw. To be perfectly correct, this flag
+        // would have to be associated with a buffer.
+        if (mFixedSize)
+            return true;
+    }
+    return LayerBase::needsFiltering();
+}
+
+
+status_t Layer::setBufferCount(int bufferCount)
+{
+    ClientRef::Access sharedClient(mUserClientRef);
+    SharedBufferServer* lcblk(sharedClient.get());
+    if (!lcblk) {
+        // oops, the client is already gone
+        return DEAD_OBJECT;
+    }
+
+    // NOTE: lcblk->resize() is protected by an internal lock
+    status_t err = lcblk->resize(bufferCount);
+    if (err == NO_ERROR)
+        mBufferManager.resize(bufferCount);
+
+    return err;
+}
+
+sp<GraphicBuffer> Layer::requestBuffer(int index,
+        uint32_t reqWidth, uint32_t reqHeight, uint32_t reqFormat,
+        uint32_t usage)
+{
+    sp<GraphicBuffer> buffer;
+
+    if (int32_t(reqWidth | reqHeight | reqFormat) < 0)
+        return buffer;
+
+    if ((!reqWidth && reqHeight) || (reqWidth && !reqHeight))
+        return buffer;
+
+    // this ensures our client doesn't go away while we're accessing
+    // the shared area.
+    ClientRef::Access sharedClient(mUserClientRef);
+    SharedBufferServer* lcblk(sharedClient.get());
+    if (!lcblk) {
+        // oops, the client is already gone
+        return buffer;
+    }
+
+    /*
+     * This is called from the client's Surface::dequeue(). This can happen
+     * at any time, especially while we're in the middle of using the
+     * buffer 'index' as our front buffer.
+     *
+     * Make sure the buffer we're resizing is not the front buffer and has been
+     * dequeued. Once this condition is asserted, we are guaranteed that this
+     * buffer cannot become the front buffer under our feet, since we're called
+     * from Surface::dequeue()
+     */
+    status_t err = lcblk->assertReallocate(index);
+    LOGE_IF(err, "assertReallocate(%d) failed (%s)", index, strerror(-err));
+    if (err != NO_ERROR) {
+        // the surface may have died
+        return buffer;
+    }
+
+    uint32_t w, h, f;
+    { // scope for the lock
+        Mutex::Autolock _l(mLock);
+        const bool fixedSizeChanged = mFixedSize != (reqWidth && reqHeight);
+        const bool formatChanged    = mReqFormat != reqFormat;
+        mReqWidth  = reqWidth;
+        mReqHeight = reqHeight;
+        mReqFormat = reqFormat;
+        mFixedSize = reqWidth && reqHeight;
+        w = reqWidth  ? reqWidth  : mWidth;
+        h = reqHeight ? reqHeight : mHeight;
+        f = reqFormat ? reqFormat : mFormat;
+        buffer = mBufferManager.detachBuffer(index);
+        if (fixedSizeChanged || formatChanged) {
+            lcblk->reallocateAllExcept(index);
+        }
+    }
+
+    const uint32_t effectiveUsage = getEffectiveUsage(usage);
+    if (buffer!=0 && buffer->getStrongCount() == 1) {
+        err = buffer->reallocate(w, h, f, effectiveUsage);
+    } else {
+        // here we have to reallocate a new buffer because we could have a
+        // client in our process with a reference to it (eg: status bar),
+        // and we can't release the handle under its feet.
+        buffer.clear();
+        buffer = new GraphicBuffer(w, h, f, effectiveUsage);
+        err = buffer->initCheck();
+    }
+
+    if (err || buffer->handle == 0) {
+        LOGE_IF(err || buffer->handle == 0,
+                "Layer::requestBuffer(this=%p), index=%d, w=%d, h=%d failed (%s)",
+                this, index, w, h, strerror(-err));
+    } else {
+        LOGD_IF(DEBUG_RESIZE,
+                "Layer::requestBuffer(this=%p), index=%d, w=%d, h=%d, handle=%p",
+                this, index, w, h, buffer->handle);
+    }
+
+    if (err == NO_ERROR && buffer->handle != 0) {
+        Mutex::Autolock _l(mLock);
+        mBufferManager.attachBuffer(index, buffer);
+    }
+    return buffer;
+}
+
+uint32_t Layer::getEffectiveUsage(uint32_t usage) const
+{
+    /*
+     *  buffers used for software rendering, but h/w composition
+     *  are allocated with SW_READ_OFTEN | SW_WRITE_OFTEN | HW_TEXTURE
+     *
+     *  buffers used for h/w rendering and h/w composition
+     *  are allocated with  HW_RENDER | HW_TEXTURE
+     *
+     *  buffers used with h/w rendering and either NPOT or no egl_image_ext
+     *  are allocated with SW_READ_RARELY | HW_RENDER
+     *
+     */
+
+    if (mSecure) {
+        // secure buffer, don't store it into the GPU
+        usage = GraphicBuffer::USAGE_SW_READ_OFTEN |
+                GraphicBuffer::USAGE_SW_WRITE_OFTEN;
+    } else {
+        // it's allowed to modify the usage flags here, but generally
+        // the requested flags should be honored.
+        // request EGLImage for all buffers
+        usage |= GraphicBuffer::USAGE_HW_TEXTURE;
+    }
+    return usage;
+}
+
+uint32_t Layer::doTransaction(uint32_t flags)
+{
+    const Layer::State& front(drawingState());
+    const Layer::State& temp(currentState());
+
+    const bool sizeChanged = (front.requested_w != temp.requested_w) ||
+            (front.requested_h != temp.requested_h);
+
+    if (sizeChanged) {
+        // the size changed, we need to ask our client to request a new buffer
+        LOGD_IF(DEBUG_RESIZE,
+                "resize (layer=%p), requested (%dx%d), drawing (%d,%d)",
+                this,
+                int(temp.requested_w), int(temp.requested_h),
+                int(front.requested_w), int(front.requested_h));
+
+        if (!isFixedSize()) {
+            // we're being resized and there is a freeze display request,
+            // acquire a freeze lock, so that the screen stays put
+            // until we've redrawn at the new size; this is to avoid
+            // glitches upon orientation changes.
+            if (mFlinger->hasFreezeRequest()) {
+                // if the surface is hidden, don't try to acquire the
+                // freeze lock, since hidden surfaces may never redraw
+                if (!(front.flags & ISurfaceComposer::eLayerHidden)) {
+                    mFreezeLock = mFlinger->getFreezeLock();
+                }
+            }
+
+            // this will make sure LayerBase::doTransaction doesn't update
+            // the drawing state's size
+            Layer::State& editDraw(mDrawingState);
+            editDraw.requested_w = temp.requested_w;
+            editDraw.requested_h = temp.requested_h;
+
+            // record the new size, form this point on, when the client request
+            // a buffer, it'll get the new size.
+            setBufferSize(temp.requested_w, temp.requested_h);
+
+            ClientRef::Access sharedClient(mUserClientRef);
+            SharedBufferServer* lcblk(sharedClient.get());
+            if (lcblk) {
+                // all buffers need reallocation
+                lcblk->reallocateAll();
+            }
+        } else {
+            // record the new size
+            setBufferSize(temp.requested_w, temp.requested_h);
+        }
+    }
+
+    if (temp.sequence != front.sequence) {
+        if (temp.flags & ISurfaceComposer::eLayerHidden || temp.alpha == 0) {
+            // this surface is now hidden, so it shouldn't hold a freeze lock
+            // (it may never redraw, which is fine if it is hidden)
+            mFreezeLock.clear();
+        }
+    }
+        
+    return LayerBase::doTransaction(flags);
+}
+
+void Layer::setBufferSize(uint32_t w, uint32_t h) {
+    Mutex::Autolock _l(mLock);
+    mWidth = w;
+    mHeight = h;
+}
+
+bool Layer::isFixedSize() const {
+    Mutex::Autolock _l(mLock);
+    return mFixedSize;
+}
+
+// ----------------------------------------------------------------------------
+// pageflip handling...
+// ----------------------------------------------------------------------------
+
+void Layer::lockPageFlip(bool& recomputeVisibleRegions)
+{
+    ClientRef::Access sharedClient(mUserClientRef);
+    SharedBufferServer* lcblk(sharedClient.get());
+    if (!lcblk) {
+        // client died
+        recomputeVisibleRegions = true;
+        return;
+    }
+
+    ssize_t buf = lcblk->retireAndLock();
+    if (buf == NOT_ENOUGH_DATA) {
+        // NOTE: This is not an error, it simply means there is nothing to
+        // retire. The buffer is locked because we will use it
+        // for composition later in the loop
+        return;
+    }
+
+    if (buf < NO_ERROR) {
+        LOGE("retireAndLock() buffer index (%d) out of range", int(buf));
+        mPostedDirtyRegion.clear();
+        return;
+    }
+
+    // we retired a buffer, which becomes the new front buffer
+    if (mBufferManager.setActiveBufferIndex(buf) < NO_ERROR) {
+        LOGE("retireAndLock() buffer index (%d) out of range", int(buf));
+        mPostedDirtyRegion.clear();
+        return;
+    }
+
+    // get the dirty region
+    sp<GraphicBuffer> newFrontBuffer(getBuffer(buf));
+    if (newFrontBuffer != NULL) {
+        // compute the posted region
+        const Region dirty(lcblk->getDirtyRegion(buf));
+        mPostedDirtyRegion = dirty.intersect( newFrontBuffer->getBounds() );
+
+        // update the layer size and release freeze-lock
+        const Layer::State& front(drawingState());
+        if (newFrontBuffer->getWidth()  == front.requested_w &&
+            newFrontBuffer->getHeight() == front.requested_h)
+        {
+            if ((front.w != front.requested_w) ||
+                (front.h != front.requested_h))
+            {
+                // Here we pretend the transaction happened by updating the
+                // current and drawing states. Drawing state is only accessed
+                // in this thread, no need to have it locked
+                Layer::State& editDraw(mDrawingState);
+                editDraw.w = editDraw.requested_w;
+                editDraw.h = editDraw.requested_h;
+
+                // We also need to update the current state so that we don't
+                // end-up doing too much work during the next transaction.
+                // NOTE: We actually don't need hold the transaction lock here
+                // because State::w and State::h are only accessed from
+                // this thread
+                Layer::State& editTemp(currentState());
+                editTemp.w = editDraw.w;
+                editTemp.h = editDraw.h;
+
+                // recompute visible region
+                recomputeVisibleRegions = true;
+            }
+
+            // we now have the correct size, unfreeze the screen
+            mFreezeLock.clear();
+        }
+    } else {
+        // this should not happen unless we ran out of memory while
+        // allocating the buffer. we're hoping that things will get back
+        // to normal the next time the app tries to draw into this buffer.
+        // meanwhile, pretend the screen didn't update.
+        mPostedDirtyRegion.clear();
+    }
+
+    if (lcblk->getQueuedCount()) {
+        // signal an event if we have more buffers waiting
+        mFlinger->signalEvent();
+    }
+
+    /* a buffer was posted, so we need to call reloadTexture(), which
+     * will update our internal data structures (eg: EGLImageKHR or
+     * texture names). we need to do this even if mPostedDirtyRegion is
+     * empty -- it's orthogonal to the fact that a new buffer was posted,
+     * for instance, a degenerate case could be that the user did an empty
+     * update but repainted the buffer with appropriate content (after a
+     * resize for instance).
+     */
+    reloadTexture( mPostedDirtyRegion );
+}
+
+void Layer::unlockPageFlip(
+        const Transform& planeTransform, Region& outDirtyRegion)
+{
+    Region dirtyRegion(mPostedDirtyRegion);
+    if (!dirtyRegion.isEmpty()) {
+        mPostedDirtyRegion.clear();
+        // The dirty region is given in the layer's coordinate space
+        // transform the dirty region by the surface's transformation
+        // and the global transformation.
+        const Layer::State& s(drawingState());
+        const Transform tr(planeTransform * s.transform);
+        dirtyRegion = tr.transform(dirtyRegion);
+
+        // At this point, the dirty region is in screen space.
+        // Make sure it's constrained by the visible region (which
+        // is in screen space as well).
+        dirtyRegion.andSelf(visibleRegionScreen);
+        outDirtyRegion.orSelf(dirtyRegion);
+    }
+    if (visibleRegionScreen.isEmpty()) {
+        // an invisible layer should not hold a freeze-lock
+        // (because it may never be updated and therefore never release it)
+        mFreezeLock.clear();
+    }
+}
+
+void Layer::finishPageFlip()
+{
+    ClientRef::Access sharedClient(mUserClientRef);
+    SharedBufferServer* lcblk(sharedClient.get());
+    if (lcblk) {
+        int buf = mBufferManager.getActiveBufferIndex();
+        if (buf >= 0) {
+            status_t err = lcblk->unlock( buf );
+            LOGE_IF(err!=NO_ERROR,
+                    "layer %p, buffer=%d wasn't locked!",
+                    this, buf);
+        }
+    }
+}
+
+
+void Layer::dump(String8& result, char* buffer, size_t SIZE) const
+{
+    LayerBaseClient::dump(result, buffer, SIZE);
+
+    ClientRef::Access sharedClient(mUserClientRef);
+    SharedBufferServer* lcblk(sharedClient.get());
+    uint32_t totalTime = 0;
+    if (lcblk) {
+        SharedBufferStack::Statistics stats = lcblk->getStats();
+        totalTime= stats.totalTime;
+        result.append( lcblk->dump("      ") );
+    }
+
+    sp<const GraphicBuffer> buf0(getBuffer(0));
+    sp<const GraphicBuffer> buf1(getBuffer(1));
+    uint32_t w0=0, h0=0, s0=0;
+    uint32_t w1=0, h1=0, s1=0;
+    if (buf0 != 0) {
+        w0 = buf0->getWidth();
+        h0 = buf0->getHeight();
+        s0 = buf0->getStride();
+    }
+    if (buf1 != 0) {
+        w1 = buf1->getWidth();
+        h1 = buf1->getHeight();
+        s1 = buf1->getStride();
+    }
+    snprintf(buffer, SIZE,
+            "      "
+            "format=%2d, [%3ux%3u:%3u] [%3ux%3u:%3u],"
+            " freezeLock=%p, dq-q-time=%u us\n",
+            mFormat, w0, h0, s0, w1, h1, s1,
+            getFreezeLock().get(), totalTime);
+
+    result.append(buffer);
+}
+
+// ---------------------------------------------------------------------------
+
+Layer::ClientRef::ClientRef()
+    : mControlBlock(0), mToken(-1) {
+}
+
+Layer::ClientRef::~ClientRef() {
+}
+
+int32_t Layer::ClientRef::getToken() const {
+    Mutex::Autolock _l(mLock);
+    return mToken;
+}
+
+sp<UserClient> Layer::ClientRef::getClient() const {
+    Mutex::Autolock _l(mLock);
+    return mUserClient.promote();
+}
+
+status_t Layer::ClientRef::setToken(const sp<UserClient>& uc,
+        const sp<SharedBufferServer>& sharedClient, int32_t token) {
+    Mutex::Autolock _l(mLock);
+
+    { // scope for strong mUserClient reference
+        sp<UserClient> userClient(mUserClient.promote());
+        if (mUserClient != 0 && mControlBlock != 0) {
+            mControlBlock->setStatus(NO_INIT);
+        }
+    }
+
+    mUserClient = uc;
+    mToken = token;
+    mControlBlock = sharedClient;
+    return NO_ERROR;
+}
+
+sp<UserClient> Layer::ClientRef::getUserClientUnsafe() const {
+    return mUserClient.promote();
+}
+
+// this class gives us access to SharedBufferServer safely
+// it makes sure the UserClient (and its associated shared memory)
+// won't go away while we're accessing it.
+Layer::ClientRef::Access::Access(const ClientRef& ref)
+    : mControlBlock(0)
+{
+    Mutex::Autolock _l(ref.mLock);
+    mUserClientStrongRef = ref.mUserClient.promote();
+    if (mUserClientStrongRef != 0)
+        mControlBlock = ref.mControlBlock;
+}
+
+Layer::ClientRef::Access::~Access()
+{
+}
+
+// ---------------------------------------------------------------------------
+
+Layer::BufferManager::BufferManager(TextureManager& tm)
+    : mNumBuffers(NUM_BUFFERS), mTextureManager(tm),
+      mActiveBuffer(-1), mFailover(false)
+{
+}
+
+Layer::BufferManager::~BufferManager()
+{
+}
+
+status_t Layer::BufferManager::resize(size_t size)
+{
+    Mutex::Autolock _l(mLock);
+    mNumBuffers = size;
+    return NO_ERROR;
+}
+
+// only for debugging
+sp<GraphicBuffer> Layer::BufferManager::getBuffer(size_t index) const {
+    return mBufferData[index].buffer;
+}
+
+status_t Layer::BufferManager::setActiveBufferIndex(size_t index) {
+    mActiveBuffer = index;
+    return NO_ERROR;
+}
+
+size_t Layer::BufferManager::getActiveBufferIndex() const {
+    return mActiveBuffer;
+}
+
+Texture Layer::BufferManager::getActiveTexture() const {
+    Texture res;
+    if (mFailover || mActiveBuffer<0) {
+        res = mFailoverTexture;
+    } else {
+        static_cast<Image&>(res) = mBufferData[mActiveBuffer].texture;
+    }
+    return res;
+}
+
+sp<GraphicBuffer> Layer::BufferManager::getActiveBuffer() const {
+    sp<GraphicBuffer> result;
+    const ssize_t activeBuffer = mActiveBuffer;
+    if (activeBuffer >= 0) {
+        BufferData const * const buffers = mBufferData;
+        Mutex::Autolock _l(mLock);
+        result = buffers[activeBuffer].buffer;
+    }
+    return result;
+}
+
+sp<GraphicBuffer> Layer::BufferManager::detachBuffer(size_t index)
+{
+    BufferData* const buffers = mBufferData;
+    sp<GraphicBuffer> buffer;
+    Mutex::Autolock _l(mLock);
+    buffer = buffers[index].buffer;
+    buffers[index].buffer = 0;
+    return buffer;
+}
+
+status_t Layer::BufferManager::attachBuffer(size_t index,
+        const sp<GraphicBuffer>& buffer)
+{
+    BufferData* const buffers = mBufferData;
+    Mutex::Autolock _l(mLock);
+    buffers[index].buffer = buffer;
+    buffers[index].texture.dirty = true;
+    return NO_ERROR;
+}
+
+status_t Layer::BufferManager::destroy(EGLDisplay dpy)
+{
+    BufferData* const buffers = mBufferData;
+    size_t num;
+    { // scope for the lock
+        Mutex::Autolock _l(mLock);
+        num = mNumBuffers;
+        for (size_t i=0 ; i<num ; i++) {
+            buffers[i].buffer = 0;
+        }
+    }
+    for (size_t i=0 ; i<num ; i++) {
+        destroyTexture(&buffers[i].texture, dpy);
+    }
+    destroyTexture(&mFailoverTexture, dpy);
+    return NO_ERROR;
+}
+
+status_t Layer::BufferManager::initEglImage(EGLDisplay dpy,
+        const sp<GraphicBuffer>& buffer)
+{
+    status_t err = NO_INIT;
+    ssize_t index = mActiveBuffer;
+    if (index >= 0) {
+        if (!mFailover) {
+            Image& texture(mBufferData[index].texture);
+            err = mTextureManager.initEglImage(&texture, dpy, buffer);
+            // if EGLImage fails, we switch to regular texture mode, and we
+            // free all resources associated with using EGLImages.
+            if (err == NO_ERROR) {
+                mFailover = false;
+                destroyTexture(&mFailoverTexture, dpy);
+            } else {
+                mFailover = true;
+                const size_t num = mNumBuffers;
+                for (size_t i=0 ; i<num ; i++) {
+                    destroyTexture(&mBufferData[i].texture, dpy);
+                }
+            }
+        } else {
+            // we failed once, don't try again
+            err = BAD_VALUE;
+        }
+    }
+    return err;
+}
+
+status_t Layer::BufferManager::loadTexture(
+        const Region& dirty, const GGLSurface& t)
+{
+    return mTextureManager.loadTexture(&mFailoverTexture, dirty, t);
+}
+
+status_t Layer::BufferManager::destroyTexture(Image* tex, EGLDisplay dpy)
+{
+    if (tex->name != -1U) {
+        glDeleteTextures(1, &tex->name);
+        tex->name = -1U;
+    }
+    if (tex->image != EGL_NO_IMAGE_KHR) {
+        eglDestroyImageKHR(dpy, tex->image);
+        tex->image = EGL_NO_IMAGE_KHR;
+    }
+    return NO_ERROR;
+}
+
+// ---------------------------------------------------------------------------
+
+Layer::SurfaceLayer::SurfaceLayer(const sp<SurfaceFlinger>& flinger,
+        const sp<Layer>& owner)
+    : Surface(flinger, owner->getIdentity(), owner)
+{
+}
+
+Layer::SurfaceLayer::~SurfaceLayer()
+{
+}
+
+sp<GraphicBuffer> Layer::SurfaceLayer::requestBuffer(int index,
+        uint32_t w, uint32_t h, uint32_t format, uint32_t usage)
+{
+    sp<GraphicBuffer> buffer;
+    sp<Layer> owner(getOwner());
+    if (owner != 0) {
+        /*
+         * requestBuffer() cannot be called from the main thread
+         * as it could cause a dead-lock, since it may have to wait
+         * on conditions updated my the main thread.
+         */
+        buffer = owner->requestBuffer(index, w, h, format, usage);
+    }
+    return buffer;
+}
+
+status_t Layer::SurfaceLayer::setBufferCount(int bufferCount)
+{
+    status_t err = DEAD_OBJECT;
+    sp<Layer> owner(getOwner());
+    if (owner != 0) {
+        /*
+         * setBufferCount() cannot be called from the main thread
+         * as it could cause a dead-lock, since it may have to wait
+         * on conditions updated my the main thread.
+         */
+        err = owner->setBufferCount(bufferCount);
+    }
+    return err;
+}
+
+// ---------------------------------------------------------------------------
+
+
+}; // namespace android
diff --git a/services/surfaceflinger/Layer.h b/services/surfaceflinger/Layer.h
new file mode 100644
index 0000000..e1d283b
--- /dev/null
+++ b/services/surfaceflinger/Layer.h
@@ -0,0 +1,239 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_LAYER_H
+#define ANDROID_LAYER_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <ui/GraphicBuffer.h>
+#include <ui/PixelFormat.h>
+#include <pixelflinger/pixelflinger.h>
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <GLES/gl.h>
+#include <GLES/glext.h>
+
+#include "LayerBase.h"
+#include "Transform.h"
+#include "TextureManager.h"
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+class FreezeLock;
+class Client;
+class GLExtensions;
+class UserClient;
+
+// ---------------------------------------------------------------------------
+
+class Layer : public LayerBaseClient
+{
+public:
+            Layer(SurfaceFlinger* flinger, DisplayID display,
+                    const sp<Client>& client);
+
+    virtual ~Layer();
+
+    virtual const char* getTypeId() const { return "Layer"; }
+
+    // the this layer's size and format
+    status_t setBuffers(uint32_t w, uint32_t h, 
+            PixelFormat format, uint32_t flags=0);
+
+    // associate a UserClient to this Layer
+    status_t setToken(const sp<UserClient>& uc, SharedClient* sc, int32_t idx);
+    int32_t getToken() const;
+    sp<UserClient> getClient() const;
+
+    // Set this Layer's buffers size
+    void setBufferSize(uint32_t w, uint32_t h);
+    bool isFixedSize() const;
+
+    // LayerBase interface
+    virtual void onDraw(const Region& clip) const;
+    virtual uint32_t doTransaction(uint32_t transactionFlags);
+    virtual void lockPageFlip(bool& recomputeVisibleRegions);
+    virtual void unlockPageFlip(const Transform& planeTransform, Region& outDirtyRegion);
+    virtual void finishPageFlip();
+    virtual bool needsBlending() const      { return mNeedsBlending; }
+    virtual bool needsDithering() const     { return mNeedsDithering; }
+    virtual bool needsFiltering() const;
+    virtual bool isSecure() const           { return mSecure; }
+    virtual sp<Surface> createSurface() const;
+    virtual status_t ditch();
+    virtual void onRemoved();
+
+    // only for debugging
+    inline sp<GraphicBuffer> getBuffer(int i) const {
+        return mBufferManager.getBuffer(i); }
+    // only for debugging
+    inline const sp<FreezeLock>&  getFreezeLock() const {
+        return mFreezeLock; }
+
+protected:
+    virtual void dump(String8& result, char* scratch, size_t size) const;
+
+private:
+    void reloadTexture(const Region& dirty);
+    uint32_t getEffectiveUsage(uint32_t usage) const;
+    sp<GraphicBuffer> requestBuffer(int bufferIdx,
+            uint32_t w, uint32_t h, uint32_t format, uint32_t usage);
+    status_t setBufferCount(int bufferCount);
+
+    // -----------------------------------------------------------------------
+
+    class SurfaceLayer : public LayerBaseClient::Surface {
+    public:
+        SurfaceLayer(const sp<SurfaceFlinger>& flinger, const sp<Layer>& owner);
+        ~SurfaceLayer();
+    private:
+        virtual sp<GraphicBuffer> requestBuffer(int bufferIdx,
+                uint32_t w, uint32_t h, uint32_t format, uint32_t usage);
+        virtual status_t setBufferCount(int bufferCount);
+        sp<Layer> getOwner() const {
+            return static_cast<Layer*>(Surface::getOwner().get());
+        }
+    };
+    friend class SurfaceLayer;
+
+    // -----------------------------------------------------------------------
+
+    class ClientRef {
+        ClientRef(const ClientRef& rhs);
+        ClientRef& operator = (const ClientRef& rhs);
+        mutable Mutex mLock;
+        // binder thread, page-flip thread
+        sp<SharedBufferServer> mControlBlock;
+        wp<UserClient> mUserClient;
+        int32_t mToken;
+    public:
+        ClientRef();
+        ~ClientRef();
+        int32_t getToken() const;
+        sp<UserClient> getClient() const;
+        status_t setToken(const sp<UserClient>& uc,
+                const sp<SharedBufferServer>& sharedClient, int32_t token);
+        sp<UserClient> getUserClientUnsafe() const;
+        class Access {
+            Access(const Access& rhs);
+            Access& operator = (const Access& rhs);
+            sp<UserClient> mUserClientStrongRef;
+            sp<SharedBufferServer> mControlBlock;
+        public:
+            Access(const ClientRef& ref);
+            ~Access();
+            inline SharedBufferServer* get() const { return mControlBlock.get(); }
+        };
+        friend class Access;
+    };
+
+    // -----------------------------------------------------------------------
+
+    class BufferManager {
+        static const size_t NUM_BUFFERS = 2;
+        struct BufferData {
+            sp<GraphicBuffer>   buffer;
+            Image               texture;
+        };
+        // this lock protect mBufferData[].buffer but since there
+        // is very little contention, we have only one like for
+        // the whole array, we also use it to protect mNumBuffers.
+        mutable Mutex mLock;
+        BufferData          mBufferData[SharedBufferStack::NUM_BUFFER_MAX];
+        size_t              mNumBuffers;
+        Texture             mFailoverTexture;
+        TextureManager&     mTextureManager;
+        ssize_t             mActiveBuffer;
+        bool                mFailover;
+        static status_t destroyTexture(Image* tex, EGLDisplay dpy);
+
+    public:
+        static size_t getDefaultBufferCount() { return NUM_BUFFERS; }
+        BufferManager(TextureManager& tm);
+        ~BufferManager();
+
+        // detach/attach buffer from/to given index
+        sp<GraphicBuffer> detachBuffer(size_t index);
+        status_t attachBuffer(size_t index, const sp<GraphicBuffer>& buffer);
+        // resize the number of active buffers
+        status_t resize(size_t size);
+
+        // ----------------------------------------------
+        // must be called from GL thread
+
+        // set/get active buffer index
+        status_t setActiveBufferIndex(size_t index);
+        size_t getActiveBufferIndex() const;
+        // return the active buffer
+        sp<GraphicBuffer> getActiveBuffer() const;
+        // return the active texture (or fail-over)
+        Texture getActiveTexture() const;
+        // frees resources associated with all buffers
+        status_t destroy(EGLDisplay dpy);
+        // load bitmap data into the active buffer
+        status_t loadTexture(const Region& dirty, const GGLSurface& t);
+        // make active buffer an EGLImage if needed
+        status_t initEglImage(EGLDisplay dpy,
+                const sp<GraphicBuffer>& buffer);
+
+        // ----------------------------------------------
+        // only for debugging
+        sp<GraphicBuffer> getBuffer(size_t index) const;
+    };
+
+    // -----------------------------------------------------------------------
+
+    // thread-safe
+    ClientRef mUserClientRef;
+
+    // constants
+    sp<Surface> mSurface;
+    PixelFormat mFormat;
+    const GLExtensions& mGLExtensions;
+    bool mNeedsBlending;
+    bool mNeedsDithering;
+
+    // page-flip thread (currently main thread)
+    bool mSecure;
+    Region mPostedDirtyRegion;
+
+    // page-flip thread and transaction thread (currently main thread)
+    sp<FreezeLock>  mFreezeLock;
+
+    // see threading usage in declaration
+    TextureManager mTextureManager;
+    BufferManager mBufferManager;
+
+    // binder thread, transaction thread
+    mutable Mutex mLock;
+    uint32_t mWidth;
+    uint32_t mHeight;
+    uint32_t mReqWidth;
+    uint32_t mReqHeight;
+    uint32_t mReqFormat;
+    bool mFixedSize;
+};
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
+
+#endif // ANDROID_LAYER_H
diff --git a/services/surfaceflinger/LayerBase.cpp b/services/surfaceflinger/LayerBase.cpp
new file mode 100644
index 0000000..d5aa53f
--- /dev/null
+++ b/services/surfaceflinger/LayerBase.cpp
@@ -0,0 +1,593 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <utils/Errors.h>
+#include <utils/Log.h>
+#include <binder/IPCThreadState.h>
+#include <binder/IServiceManager.h>
+
+#include <GLES/gl.h>
+#include <GLES/glext.h>
+
+#include <hardware/hardware.h>
+
+#include "clz.h"
+#include "LayerBase.h"
+#include "SurfaceFlinger.h"
+#include "DisplayHardware/DisplayHardware.h"
+#include "TextureManager.h"
+
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+LayerBase::LayerBase(SurfaceFlinger* flinger, DisplayID display)
+    : dpy(display), contentDirty(false),
+      mFlinger(flinger),
+      mNeedsFiltering(false),
+      mOrientation(0),
+      mLeft(0), mTop(0),
+      mTransactionFlags(0),
+      mPremultipliedAlpha(true), mName("unnamed"), mDebug(false),
+      mInvalidate(0)
+{
+    const DisplayHardware& hw(flinger->graphicPlane(0).displayHardware());
+    mFlags = hw.getFlags();
+}
+
+LayerBase::~LayerBase()
+{
+}
+
+void LayerBase::setName(const String8& name) {
+    mName = name;
+}
+
+String8 LayerBase::getName() const {
+    return mName;
+}
+
+const GraphicPlane& LayerBase::graphicPlane(int dpy) const
+{ 
+    return mFlinger->graphicPlane(dpy);
+}
+
+GraphicPlane& LayerBase::graphicPlane(int dpy)
+{
+    return mFlinger->graphicPlane(dpy); 
+}
+
+void LayerBase::initStates(uint32_t w, uint32_t h, uint32_t flags)
+{
+    uint32_t layerFlags = 0;
+    if (flags & ISurfaceComposer::eHidden)
+        layerFlags = ISurfaceComposer::eLayerHidden;
+
+    if (flags & ISurfaceComposer::eNonPremultiplied)
+        mPremultipliedAlpha = false;
+
+    mCurrentState.z             = 0;
+    mCurrentState.w             = w;
+    mCurrentState.h             = h;
+    mCurrentState.requested_w   = w;
+    mCurrentState.requested_h   = h;
+    mCurrentState.alpha         = 0xFF;
+    mCurrentState.flags         = layerFlags;
+    mCurrentState.sequence      = 0;
+    mCurrentState.transform.set(0, 0);
+
+    // drawing state & current state are identical
+    mDrawingState = mCurrentState;
+}
+
+void LayerBase::commitTransaction() {
+    mDrawingState = mCurrentState;
+}
+void LayerBase::forceVisibilityTransaction() {
+    // this can be called without SurfaceFlinger.mStateLock, but if we
+    // can atomically increment the sequence number, it doesn't matter.
+    android_atomic_inc(&mCurrentState.sequence);
+    requestTransaction();
+}
+bool LayerBase::requestTransaction() {
+    int32_t old = setTransactionFlags(eTransactionNeeded);
+    return ((old & eTransactionNeeded) == 0);
+}
+uint32_t LayerBase::getTransactionFlags(uint32_t flags) {
+    return android_atomic_and(~flags, &mTransactionFlags) & flags;
+}
+uint32_t LayerBase::setTransactionFlags(uint32_t flags) {
+    return android_atomic_or(flags, &mTransactionFlags);
+}
+
+bool LayerBase::setPosition(int32_t x, int32_t y) {
+    if (mCurrentState.transform.tx() == x && mCurrentState.transform.ty() == y)
+        return false;
+    mCurrentState.sequence++;
+    mCurrentState.transform.set(x, y);
+    requestTransaction();
+    return true;
+}
+bool LayerBase::setLayer(uint32_t z) {
+    if (mCurrentState.z == z)
+        return false;
+    mCurrentState.sequence++;
+    mCurrentState.z = z;
+    requestTransaction();
+    return true;
+}
+bool LayerBase::setSize(uint32_t w, uint32_t h) {
+    if (mCurrentState.requested_w == w && mCurrentState.requested_h == h)
+        return false;
+    mCurrentState.requested_w = w;
+    mCurrentState.requested_h = h;
+    requestTransaction();
+    return true;
+}
+bool LayerBase::setAlpha(uint8_t alpha) {
+    if (mCurrentState.alpha == alpha)
+        return false;
+    mCurrentState.sequence++;
+    mCurrentState.alpha = alpha;
+    requestTransaction();
+    return true;
+}
+bool LayerBase::setMatrix(const layer_state_t::matrix22_t& matrix) {
+    mCurrentState.sequence++;
+    mCurrentState.transform.set(
+            matrix.dsdx, matrix.dsdy, matrix.dtdx, matrix.dtdy);
+    requestTransaction();
+    return true;
+}
+bool LayerBase::setTransparentRegionHint(const Region& transparent) {
+    mCurrentState.sequence++;
+    mCurrentState.transparentRegion = transparent;
+    requestTransaction();
+    return true;
+}
+bool LayerBase::setFlags(uint8_t flags, uint8_t mask) {
+    const uint32_t newFlags = (mCurrentState.flags & ~mask) | (flags & mask);
+    if (mCurrentState.flags == newFlags)
+        return false;
+    mCurrentState.sequence++;
+    mCurrentState.flags = newFlags;
+    requestTransaction();
+    return true;
+}
+
+Rect LayerBase::visibleBounds() const
+{
+    return mTransformedBounds;
+}      
+
+void LayerBase::setVisibleRegion(const Region& visibleRegion) {
+    // always called from main thread
+    visibleRegionScreen = visibleRegion;
+}
+
+void LayerBase::setCoveredRegion(const Region& coveredRegion) {
+    // always called from main thread
+    coveredRegionScreen = coveredRegion;
+}
+
+uint32_t LayerBase::doTransaction(uint32_t flags)
+{
+    const Layer::State& front(drawingState());
+    const Layer::State& temp(currentState());
+
+    if ((front.requested_w != temp.requested_w) ||
+        (front.requested_h != temp.requested_h))  {
+        // resize the layer, set the physical size to the requested size
+        Layer::State& editTemp(currentState());
+        editTemp.w = temp.requested_w;
+        editTemp.h = temp.requested_h;
+    }
+
+    if ((front.w != temp.w) || (front.h != temp.h)) {
+        // invalidate and recompute the visible regions if needed
+        flags |= Layer::eVisibleRegion;
+    }
+
+    if (temp.sequence != front.sequence) {
+        // invalidate and recompute the visible regions if needed
+        flags |= eVisibleRegion;
+        this->contentDirty = true;
+
+        mNeedsFiltering = false;
+        if (!(mFlags & DisplayHardware::SLOW_CONFIG)) {
+            // we may use linear filtering, if the matrix scales us
+            const uint8_t type = temp.transform.getType();
+            if (!temp.transform.preserveRects() || (type >= Transform::SCALE)) {
+                mNeedsFiltering = true;
+            }
+        }
+    }
+
+    // Commit the transaction
+    commitTransaction();
+    return flags;
+}
+
+void LayerBase::validateVisibility(const Transform& planeTransform)
+{
+    const Layer::State& s(drawingState());
+    const Transform tr(planeTransform * s.transform);
+    const bool transformed = tr.transformed();
+   
+    uint32_t w = s.w;
+    uint32_t h = s.h;    
+    tr.transform(mVertices[0], 0, 0);
+    tr.transform(mVertices[1], 0, h);
+    tr.transform(mVertices[2], w, h);
+    tr.transform(mVertices[3], w, 0);
+    if (UNLIKELY(transformed)) {
+        // NOTE: here we could also punt if we have too many rectangles
+        // in the transparent region
+        if (tr.preserveRects()) {
+            // transform the transparent region
+            transparentRegionScreen = tr.transform(s.transparentRegion);
+        } else {
+            // transformation too complex, can't do the transparent region
+            // optimization.
+            transparentRegionScreen.clear();
+        }
+    } else {
+        transparentRegionScreen = s.transparentRegion;
+    }
+
+    // cache a few things...
+    mOrientation = tr.getOrientation();
+    mTransformedBounds = tr.makeBounds(w, h);
+    mLeft = tr.tx();
+    mTop  = tr.ty();
+}
+
+void LayerBase::lockPageFlip(bool& recomputeVisibleRegions)
+{
+}
+
+void LayerBase::unlockPageFlip(
+        const Transform& planeTransform, Region& outDirtyRegion)
+{
+    if ((android_atomic_and(~1, &mInvalidate)&1) == 1) {
+        outDirtyRegion.orSelf(visibleRegionScreen);
+    }
+}
+
+void LayerBase::finishPageFlip()
+{
+}
+
+void LayerBase::invalidate()
+{
+    if ((android_atomic_or(1, &mInvalidate)&1) == 0) {
+        mFlinger->signalEvent();
+    }
+}
+
+void LayerBase::drawRegion(const Region& reg) const
+{
+    Region::const_iterator it = reg.begin();
+    Region::const_iterator const end = reg.end();
+    if (it != end) {
+        Rect r;
+        const DisplayHardware& hw(graphicPlane(0).displayHardware());
+        const int32_t fbWidth  = hw.getWidth();
+        const int32_t fbHeight = hw.getHeight();
+        const GLshort vertices[][2] = { { 0, 0 }, { fbWidth, 0 }, 
+                { fbWidth, fbHeight }, { 0, fbHeight }  };
+        glVertexPointer(2, GL_SHORT, 0, vertices);
+        while (it != end) {
+            const Rect& r = *it++;
+            const GLint sy = fbHeight - (r.top + r.height());
+            glScissor(r.left, sy, r.width(), r.height());
+            glDrawArrays(GL_TRIANGLE_FAN, 0, 4); 
+        }
+    }
+}
+
+void LayerBase::draw(const Region& inClip) const
+{
+    // invalidate the region we'll update
+    Region clip(inClip);  // copy-on-write, so no-op most of the time
+
+    // Remove the transparent area from the clipping region
+    const State& s = drawingState();
+    if (LIKELY(!s.transparentRegion.isEmpty())) {
+        clip.subtract(transparentRegionScreen);
+        if (clip.isEmpty()) {
+            // usually this won't happen because this should be taken care of
+            // by SurfaceFlinger::computeVisibleRegions()
+            return;
+        }        
+    }
+
+    // reset GL state
+    glEnable(GL_SCISSOR_TEST);
+
+    onDraw(clip);
+}
+
+void LayerBase::clearWithOpenGL(const Region& clip, GLclampf red,
+                                GLclampf green, GLclampf blue,
+                                GLclampf alpha) const
+{
+    const DisplayHardware& hw(graphicPlane(0).displayHardware());
+    const uint32_t fbHeight = hw.getHeight();
+    glColor4f(red,green,blue,alpha);
+
+    TextureManager::deactivateTextures();
+
+    glDisable(GL_BLEND);
+    glDisable(GL_DITHER);
+
+    Region::const_iterator it = clip.begin();
+    Region::const_iterator const end = clip.end();
+    glEnable(GL_SCISSOR_TEST);
+    glVertexPointer(2, GL_FLOAT, 0, mVertices);
+    while (it != end) {
+        const Rect& r = *it++;
+        const GLint sy = fbHeight - (r.top + r.height());
+        glScissor(r.left, sy, r.width(), r.height());
+        glDrawArrays(GL_TRIANGLE_FAN, 0, 4); 
+    }
+}
+
+void LayerBase::clearWithOpenGL(const Region& clip) const
+{
+    clearWithOpenGL(clip,0,0,0,0);
+}
+
+void LayerBase::drawWithOpenGL(const Region& clip, const Texture& texture) const
+{
+    const DisplayHardware& hw(graphicPlane(0).displayHardware());
+    const uint32_t fbHeight = hw.getHeight();
+    const State& s(drawingState());
+    
+    // bind our texture
+    TextureManager::activateTexture(texture, needsFiltering());
+    uint32_t width  = texture.width; 
+    uint32_t height = texture.height;
+
+    GLenum src = mPremultipliedAlpha ? GL_ONE : GL_SRC_ALPHA;
+    if (UNLIKELY(s.alpha < 0xFF)) {
+        const GLfloat alpha = s.alpha * (1.0f/255.0f);
+        if (mPremultipliedAlpha) {
+            glColor4f(alpha, alpha, alpha, alpha);
+        } else {
+            glColor4f(1, 1, 1, alpha);
+        }
+        glEnable(GL_BLEND);
+        glBlendFunc(src, GL_ONE_MINUS_SRC_ALPHA);
+        glTexEnvx(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+    } else {
+        glColor4f(1, 1, 1, 1);
+        glTexEnvx(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+        if (needsBlending()) {
+            glEnable(GL_BLEND);
+            glBlendFunc(src, GL_ONE_MINUS_SRC_ALPHA);
+        } else {
+            glDisable(GL_BLEND);
+        }
+    }
+
+    Region::const_iterator it = clip.begin();
+    Region::const_iterator const end = clip.end();
+    const GLfloat texCoords[4][2] = {
+            { 0,  0 },
+            { 0,  1 },
+            { 1,  1 },
+            { 1,  0 }
+    };
+
+    glMatrixMode(GL_TEXTURE);
+    glLoadIdentity();
+
+    // the texture's source is rotated
+    switch (texture.transform) {
+        case HAL_TRANSFORM_ROT_90:
+            glTranslatef(0, 1, 0);
+            glRotatef(-90, 0, 0, 1);
+            break;
+        case HAL_TRANSFORM_ROT_180:
+            glTranslatef(1, 1, 0);
+            glRotatef(-180, 0, 0, 1);
+            break;
+        case HAL_TRANSFORM_ROT_270:
+            glTranslatef(1, 0, 0);
+            glRotatef(-270, 0, 0, 1);
+            break;
+    }
+
+    if (texture.NPOTAdjust) {
+        glScalef(texture.wScale, texture.hScale, 1.0f);
+    }
+
+    if (needsDithering()) {
+        glEnable(GL_DITHER);
+    } else {
+        glDisable(GL_DITHER);
+    }
+
+    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+    glVertexPointer(2, GL_FLOAT, 0, mVertices);
+    glTexCoordPointer(2, GL_FLOAT, 0, texCoords);
+
+    while (it != end) {
+        const Rect& r = *it++;
+        const GLint sy = fbHeight - (r.top + r.height());
+        glScissor(r.left, sy, r.width(), r.height());
+        glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+    }
+    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+}
+
+void LayerBase::dump(String8& result, char* buffer, size_t SIZE) const
+{
+    const Layer::State& s(drawingState());
+    snprintf(buffer, SIZE,
+            "+ %s %p\n"
+            "      "
+            "z=%9d, pos=(%4d,%4d), size=(%4d,%4d), "
+            "needsBlending=%1d, needsDithering=%1d, invalidate=%1d, "
+            "alpha=0x%02x, flags=0x%08x, tr=[%.2f, %.2f][%.2f, %.2f]\n",
+            getTypeId(), this, s.z, tx(), ty(), s.w, s.h,
+            needsBlending(), needsDithering(), contentDirty,
+            s.alpha, s.flags,
+            s.transform[0][0], s.transform[0][1],
+            s.transform[1][0], s.transform[1][1]);
+    result.append(buffer);
+}
+
+// ---------------------------------------------------------------------------
+
+int32_t LayerBaseClient::sIdentity = 1;
+
+LayerBaseClient::LayerBaseClient(SurfaceFlinger* flinger, DisplayID display,
+        const sp<Client>& client)
+    : LayerBase(flinger, display), mClientRef(client),
+      mIdentity(uint32_t(android_atomic_inc(&sIdentity)))
+{
+}
+
+LayerBaseClient::~LayerBaseClient()
+{
+    sp<Client> c(mClientRef.promote());
+    if (c != 0) {
+        c->detachLayer(this);
+    }
+}
+
+sp<LayerBaseClient::Surface> LayerBaseClient::getSurface()
+{
+    sp<Surface> s;
+    Mutex::Autolock _l(mLock);
+    s = mClientSurface.promote();
+    if (s == 0) {
+        s = createSurface();
+        mClientSurface = s;
+    }
+    return s;
+}
+
+sp<LayerBaseClient::Surface> LayerBaseClient::createSurface() const
+{
+    return new Surface(mFlinger, mIdentity,
+            const_cast<LayerBaseClient *>(this));
+}
+
+void LayerBaseClient::dump(String8& result, char* buffer, size_t SIZE) const
+{
+    LayerBase::dump(result, buffer, SIZE);
+
+    sp<Client> client(mClientRef.promote());
+    snprintf(buffer, SIZE,
+            "      name=%s\n"
+            "      client=%p, identity=%u\n",
+            getName().string(),
+            client.get(), getIdentity());
+
+    result.append(buffer);
+}
+
+// ---------------------------------------------------------------------------
+
+LayerBaseClient::Surface::Surface(
+        const sp<SurfaceFlinger>& flinger,
+        int identity,
+        const sp<LayerBaseClient>& owner) 
+    : mFlinger(flinger), mIdentity(identity), mOwner(owner)
+{
+}
+
+LayerBaseClient::Surface::~Surface() 
+{
+    /*
+     * This is a good place to clean-up all client resources 
+     */
+
+    // destroy client resources
+    sp<LayerBaseClient> layer = getOwner();
+    if (layer != 0) {
+        mFlinger->destroySurface(layer);
+    }
+}
+
+sp<LayerBaseClient> LayerBaseClient::Surface::getOwner() const {
+    sp<LayerBaseClient> owner(mOwner.promote());
+    return owner;
+}
+
+status_t LayerBaseClient::Surface::onTransact(
+        uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
+{
+    switch (code) {
+        case REGISTER_BUFFERS:
+        case UNREGISTER_BUFFERS:
+        case CREATE_OVERLAY:
+        {
+            if (!mFlinger->mAccessSurfaceFlinger.checkCalling()) {
+                IPCThreadState* ipc = IPCThreadState::self();
+                const int pid = ipc->getCallingPid();
+                const int uid = ipc->getCallingUid();
+                LOGE("Permission Denial: "
+                        "can't access SurfaceFlinger pid=%d, uid=%d", pid, uid);
+                return PERMISSION_DENIED;
+            }
+        }
+    }
+    return BnSurface::onTransact(code, data, reply, flags);
+}
+
+sp<GraphicBuffer> LayerBaseClient::Surface::requestBuffer(int bufferIdx,
+        uint32_t w, uint32_t h, uint32_t format, uint32_t usage)
+{
+    return NULL; 
+}
+
+status_t LayerBaseClient::Surface::setBufferCount(int bufferCount)
+{
+    return INVALID_OPERATION;
+}
+
+status_t LayerBaseClient::Surface::registerBuffers(
+        const ISurface::BufferHeap& buffers) 
+{ 
+    return INVALID_OPERATION; 
+}
+
+void LayerBaseClient::Surface::postBuffer(ssize_t offset) 
+{
+}
+
+void LayerBaseClient::Surface::unregisterBuffers() 
+{
+}
+
+sp<OverlayRef> LayerBaseClient::Surface::createOverlay(
+        uint32_t w, uint32_t h, int32_t format, int32_t orientation)
+{
+    return NULL;
+};
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
diff --git a/services/surfaceflinger/LayerBase.h b/services/surfaceflinger/LayerBase.h
new file mode 100644
index 0000000..4288cf7
--- /dev/null
+++ b/services/surfaceflinger/LayerBase.h
@@ -0,0 +1,333 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_LAYER_BASE_H
+#define ANDROID_LAYER_BASE_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <GLES/gl.h>
+
+#include <utils/RefBase.h>
+
+#include <ui/Region.h>
+#include <ui/Overlay.h>
+
+#include <surfaceflinger/ISurfaceComposerClient.h>
+#include <private/surfaceflinger/SharedBufferStack.h>
+#include <private/surfaceflinger/LayerState.h>
+
+#include <pixelflinger/pixelflinger.h>
+
+#include "Transform.h"
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+class DisplayHardware;
+class Client;
+class GraphicBuffer;
+class GraphicPlane;
+class LayerBaseClient;
+class SurfaceFlinger;
+class Texture;
+
+// ---------------------------------------------------------------------------
+
+class LayerBase : public RefBase
+{
+public:
+            LayerBase(SurfaceFlinger* flinger, DisplayID display);
+
+    DisplayID           dpy;
+    mutable bool        contentDirty;
+            Region      visibleRegionScreen;
+            Region      transparentRegionScreen;
+            Region      coveredRegionScreen;
+            
+            struct State {
+                uint32_t        w;
+                uint32_t        h;
+                uint32_t        requested_w;
+                uint32_t        requested_h;
+                uint32_t        z;
+                uint8_t         alpha;
+                uint8_t         flags;
+                uint8_t         reserved[2];
+                int32_t         sequence;   // changes when visible regions can change
+                uint32_t        tint;
+                Transform       transform;
+                Region          transparentRegion;
+            };
+
+            void setName(const String8& name);
+            String8 getName() const;
+
+            // modify current state
+            bool setPosition(int32_t x, int32_t y);
+            bool setLayer(uint32_t z);
+            bool setSize(uint32_t w, uint32_t h);
+            bool setAlpha(uint8_t alpha);
+            bool setMatrix(const layer_state_t::matrix22_t& matrix);
+            bool setTransparentRegionHint(const Region& opaque);
+            bool setFlags(uint8_t flags, uint8_t mask);
+            
+            void commitTransaction();
+            bool requestTransaction();
+            void forceVisibilityTransaction();
+            
+            uint32_t getTransactionFlags(uint32_t flags);
+            uint32_t setTransactionFlags(uint32_t flags);
+            
+            Rect visibleBounds() const;
+            void drawRegion(const Region& reg) const;
+
+            void invalidate();
+
+    virtual sp<LayerBaseClient> getLayerBaseClient() const { return 0; }
+
+    virtual const char* getTypeId() const { return "LayerBase"; }
+
+    /**
+     * draw - performs some global clipping optimizations
+     * and calls onDraw().
+     * Typically this method is not overridden, instead implement onDraw()
+     * to perform the actual drawing.  
+     */
+    virtual void draw(const Region& clip) const;
+    
+    /**
+     * onDraw - draws the surface.
+     */
+    virtual void onDraw(const Region& clip) const = 0;
+    
+    /**
+     * initStates - called just after construction
+     */
+    virtual void initStates(uint32_t w, uint32_t h, uint32_t flags);
+    
+    /**
+     * doTransaction - process the transaction. This is a good place to figure
+     * out which attributes of the surface have changed.
+     */
+    virtual uint32_t doTransaction(uint32_t transactionFlags);
+    
+    /**
+     * setVisibleRegion - called to set the new visible region. This gives
+     * a chance to update the new visible region or record the fact it changed.
+     */
+    virtual void setVisibleRegion(const Region& visibleRegion);
+    
+    /**
+     * setCoveredRegion - called when the covered region changes. The covered
+     * region corresponds to any area of the surface that is covered
+     * (transparently or not) by another surface.
+     */
+    virtual void setCoveredRegion(const Region& coveredRegion);
+
+    /**
+     * validateVisibility - cache a bunch of things
+     */
+    virtual void validateVisibility(const Transform& globalTransform);
+
+    /**
+     * lockPageFlip - called each time the screen is redrawn and returns whether
+     * the visible regions need to be recomputed (this is a fairly heavy
+     * operation, so this should be set only if needed). Typically this is used
+     * to figure out if the content or size of a surface has changed.
+     */
+    virtual void lockPageFlip(bool& recomputeVisibleRegions);
+    
+    /**
+     * unlockPageFlip - called each time the screen is redrawn. updates the
+     * final dirty region wrt the planeTransform.
+     * At this point, all visible regions, surface position and size, etc... are
+     * correct.
+     */
+    virtual void unlockPageFlip(const Transform& planeTransform, Region& outDirtyRegion);
+    
+    /**
+     * finishPageFlip - called after all surfaces have drawn.
+     */
+    virtual void finishPageFlip();
+    
+    /**
+     * needsBlending - true if this surface needs blending
+     */
+    virtual bool needsBlending() const  { return false; }
+
+    /**
+     * needsDithering - true if this surface needs dithering
+     */
+    virtual bool needsDithering() const { return false; }
+
+    /**
+     * needsLinearFiltering - true if this surface needs filtering
+     */
+    virtual bool needsFiltering() const { return mNeedsFiltering; }
+
+    /**
+     * isSecure - true if this surface is secure, that is if it prevents
+     * screenshots or VNC servers.
+     */
+    virtual bool isSecure() const       { return false; }
+
+    /** Called from the main thread, when the surface is removed from the
+     * draw list */
+    virtual status_t ditch() { return NO_ERROR; }
+
+    /** called with the state lock when the surface is removed from the
+     *  current list */
+    virtual void onRemoved() { };
+    
+    /** always call base class first */
+    virtual void dump(String8& result, char* scratch, size_t size) const;
+
+
+    enum { // flags for doTransaction()
+        eVisibleRegion      = 0x00000002,
+    };
+
+
+    inline  const State&    drawingState() const    { return mDrawingState; }
+    inline  const State&    currentState() const    { return mCurrentState; }
+    inline  State&          currentState()          { return mCurrentState; }
+
+    static int compareCurrentStateZ(
+            sp<LayerBase> const * layerA,
+            sp<LayerBase> const * layerB) {
+        return layerA[0]->currentState().z - layerB[0]->currentState().z;
+    }
+
+    int32_t  getOrientation() const { return mOrientation; }
+    int  tx() const             { return mLeft; }
+    int  ty() const             { return mTop; }
+    
+protected:
+    const GraphicPlane& graphicPlane(int dpy) const;
+          GraphicPlane& graphicPlane(int dpy);
+
+          void clearWithOpenGL(const Region& clip, GLclampf r, GLclampf g,
+                               GLclampf b, GLclampf alpha) const;
+          void clearWithOpenGL(const Region& clip) const;
+          void drawWithOpenGL(const Region& clip, const Texture& texture) const;
+          
+                sp<SurfaceFlinger> mFlinger;
+                uint32_t        mFlags;
+
+                // cached during validateVisibility()
+                bool            mNeedsFiltering;
+                int32_t         mOrientation;
+                GLfloat         mVertices[4][2];
+                Rect            mTransformedBounds;
+                int             mLeft;
+                int             mTop;
+            
+                // these are protected by an external lock
+                State           mCurrentState;
+                State           mDrawingState;
+    volatile    int32_t         mTransactionFlags;
+
+                // don't change, don't need a lock
+                bool            mPremultipliedAlpha;
+                String8         mName;
+    mutable     bool            mDebug;
+
+
+                // atomic
+    volatile    int32_t         mInvalidate;
+                
+
+protected:
+    virtual ~LayerBase();
+
+private:
+    LayerBase(const LayerBase& rhs);
+};
+
+
+// ---------------------------------------------------------------------------
+
+class LayerBaseClient : public LayerBase
+{
+public:
+    class Surface;
+
+            LayerBaseClient(SurfaceFlinger* flinger, DisplayID display,
+                        const sp<Client>& client);
+    virtual ~LayerBaseClient();
+
+            sp<Surface> getSurface();
+    virtual sp<Surface> createSurface() const;
+    virtual sp<LayerBaseClient> getLayerBaseClient() const {
+        return const_cast<LayerBaseClient*>(this); }
+    virtual const char* getTypeId() const { return "LayerBaseClient"; }
+
+    uint32_t getIdentity() const { return mIdentity; }
+
+    class Surface : public BnSurface  {
+    public:
+        int32_t getIdentity() const { return mIdentity; }
+        
+    protected:
+        Surface(const sp<SurfaceFlinger>& flinger, int identity,
+                const sp<LayerBaseClient>& owner);
+        virtual ~Surface();
+        virtual status_t onTransact(uint32_t code, const Parcel& data,
+                Parcel* reply, uint32_t flags);
+        sp<LayerBaseClient> getOwner() const;
+
+    private:
+        virtual sp<GraphicBuffer> requestBuffer(int bufferIdx,
+                uint32_t w, uint32_t h, uint32_t format, uint32_t usage);
+        virtual status_t setBufferCount(int bufferCount);
+
+        virtual status_t registerBuffers(const ISurface::BufferHeap& buffers); 
+        virtual void postBuffer(ssize_t offset);
+        virtual void unregisterBuffers();
+        virtual sp<OverlayRef> createOverlay(uint32_t w, uint32_t h,
+                int32_t format, int32_t orientation);
+
+    protected:
+        friend class LayerBaseClient;
+        sp<SurfaceFlinger>  mFlinger;
+        int32_t             mIdentity;
+        wp<LayerBaseClient> mOwner;
+    };
+
+    friend class Surface;
+
+protected:
+    virtual void dump(String8& result, char* scratch, size_t size) const;
+
+private:
+    mutable Mutex mLock;
+    mutable wp<Surface> mClientSurface;
+    const wp<Client> mClientRef;
+    // only read
+    const uint32_t mIdentity;
+    static int32_t sIdentity;
+};
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
+
+#endif // ANDROID_LAYER_BASE_H
diff --git a/services/surfaceflinger/LayerBlur.cpp b/services/surfaceflinger/LayerBlur.cpp
new file mode 100644
index 0000000..64a43c7
--- /dev/null
+++ b/services/surfaceflinger/LayerBlur.cpp
@@ -0,0 +1,249 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <utils/Errors.h>
+#include <utils/Log.h>
+
+#include <GLES/gl.h>
+#include <GLES/glext.h>
+
+#include "clz.h"
+#include "BlurFilter.h"
+#include "LayerBlur.h"
+#include "SurfaceFlinger.h"
+#include "DisplayHardware/DisplayHardware.h"
+
+namespace android {
+// ---------------------------------------------------------------------------
+
+LayerBlur::LayerBlur(SurfaceFlinger* flinger, DisplayID display,
+        const sp<Client>& client)
+    : LayerBaseClient(flinger, display, client), mCacheDirty(true),
+          mRefreshCache(true), mCacheAge(0), mTextureName(-1U),
+          mWidthScale(1.0f), mHeightScale(1.0f),
+          mBlurFormat(GGL_PIXEL_FORMAT_RGB_565)
+{
+}
+
+LayerBlur::~LayerBlur()
+{
+    if (mTextureName != -1U) {
+        glDeleteTextures(1, &mTextureName);
+    }
+}
+
+void LayerBlur::setVisibleRegion(const Region& visibleRegion)
+{
+    LayerBaseClient::setVisibleRegion(visibleRegion);
+    if (visibleRegionScreen.isEmpty()) {
+        if (mTextureName != -1U) {
+            // We're not visible, free the texture up.
+            glBindTexture(GL_TEXTURE_2D, 0);
+            glDeleteTextures(1, &mTextureName);
+            mTextureName = -1U;
+        }
+    }
+}
+
+uint32_t LayerBlur::doTransaction(uint32_t flags)
+{
+    // we're doing a transaction, refresh the cache!
+    if (!mFlinger->isFrozen()) {
+        mRefreshCache = true;
+        mCacheDirty = true;
+        flags |= eVisibleRegion;
+        this->contentDirty = true;
+    }
+    return LayerBase::doTransaction(flags);    
+}
+
+void LayerBlur::unlockPageFlip(const Transform& planeTransform, Region& outDirtyRegion)
+{
+    // this code-path must be as tight as possible, it's called each time
+    // the screen is composited.
+    if (UNLIKELY(!visibleRegionScreen.isEmpty())) {
+        // if anything visible below us is invalidated, the cache becomes dirty
+        if (!mCacheDirty && 
+                !visibleRegionScreen.intersect(outDirtyRegion).isEmpty()) {
+            mCacheDirty = true;
+        }
+        if (mCacheDirty) {
+            if (!mFlinger->isFrozen()) {
+                // update everything below us that is visible
+                outDirtyRegion.orSelf(visibleRegionScreen);
+                nsecs_t now = systemTime();
+                if ((now - mCacheAge) >= ms2ns(500)) {
+                    mCacheAge = now;
+                    mRefreshCache = true;
+                    mCacheDirty = false;
+                } else {
+                    if (!mAutoRefreshPending) {
+                        mFlinger->postMessageAsync(
+                                new MessageBase(MessageQueue::INVALIDATE),
+                                ms2ns(500));
+                        mAutoRefreshPending = true;
+                    }
+                }
+            }
+        }
+    }
+    LayerBase::unlockPageFlip(planeTransform, outDirtyRegion);
+}
+
+void LayerBlur::onDraw(const Region& clip) const
+{
+    const DisplayHardware& hw(graphicPlane(0).displayHardware());
+    const uint32_t fbHeight = hw.getHeight();
+    int x = mTransformedBounds.left;
+    int y = mTransformedBounds.top;
+    int w = mTransformedBounds.width();
+    int h = mTransformedBounds.height();
+    GLint X = x;
+    GLint Y = fbHeight - (y + h);
+    if (X < 0) {
+        w += X;
+        X = 0;
+    }
+    if (Y < 0) {
+        h += Y;
+        Y = 0;
+    }
+    if (w<0 || h<0) {
+        // we're outside of the framebuffer
+        return;
+    }
+
+    if (mTextureName == -1U) {
+        // create the texture name the first time
+        // can't do that in the ctor, because it runs in another thread.
+        glGenTextures(1, &mTextureName);
+        glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES, &mReadFormat);
+        glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE_OES, &mReadType);
+        if (mReadFormat != GL_RGB || mReadType != GL_UNSIGNED_SHORT_5_6_5) {
+            mReadFormat = GL_RGBA;
+            mReadType = GL_UNSIGNED_BYTE;
+            mBlurFormat = GGL_PIXEL_FORMAT_RGBX_8888;
+        }
+    }
+
+    Region::const_iterator it = clip.begin();
+    Region::const_iterator const end = clip.end();
+    if (it != end) {
+#if defined(GL_OES_texture_external)
+        if (GLExtensions::getInstance().haveTextureExternal()) {
+            glDisable(GL_TEXTURE_EXTERNAL_OES);
+        }
+#endif
+        glEnable(GL_TEXTURE_2D);
+        glBindTexture(GL_TEXTURE_2D, mTextureName);
+
+        if (mRefreshCache) {
+            mRefreshCache = false;
+            mAutoRefreshPending = false;
+
+            int32_t pixelSize = 4;
+            int32_t s = w;
+            if (mReadType == GL_UNSIGNED_SHORT_5_6_5) {
+                // allocate enough memory for 4-bytes (2 pixels) aligned data
+                s = (w + 1) & ~1;
+                pixelSize = 2;
+            }
+
+            uint16_t* const pixels = (uint16_t*)malloc(s*h*pixelSize);
+
+            // This reads the frame-buffer, so a h/w GL would have to
+            // finish() its rendering first. we don't want to do that
+            // too often. Read data is 4-bytes aligned.
+            glReadPixels(X, Y, w, h, mReadFormat, mReadType, pixels);
+
+            // blur that texture.
+            GGLSurface bl;
+            bl.version = sizeof(GGLSurface);
+            bl.width = w;
+            bl.height = h;
+            bl.stride = s;
+            bl.format = mBlurFormat;
+            bl.data = (GGLubyte*)pixels;            
+            blurFilter(&bl, 8, 2);
+
+            if (GLExtensions::getInstance().haveNpot()) {
+                glTexImage2D(GL_TEXTURE_2D, 0, mReadFormat, w, h, 0,
+                        mReadFormat, mReadType, pixels);
+                mWidthScale  = 1.0f / w;
+                mHeightScale =-1.0f / h;
+                mYOffset = 0;
+            } else {
+                GLuint tw = 1 << (31 - clz(w));
+                GLuint th = 1 << (31 - clz(h));
+                if (tw < GLuint(w)) tw <<= 1;
+                if (th < GLuint(h)) th <<= 1;
+                glTexImage2D(GL_TEXTURE_2D, 0, mReadFormat, tw, th, 0,
+                        mReadFormat, mReadType, NULL);
+                glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h, 
+                        mReadFormat, mReadType, pixels);
+                mWidthScale  = 1.0f / tw;
+                mHeightScale =-1.0f / th;
+                mYOffset = th-h;
+            }
+
+            free((void*)pixels);
+        }
+
+        const State& s = drawingState();
+        if (UNLIKELY(s.alpha < 0xFF)) {
+            const GLfloat alpha = s.alpha * (1.0f/255.0f);
+            glColor4f(0, 0, 0, alpha);
+            glEnable(GL_BLEND);
+            glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+            glTexEnvx(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+        } else {
+            glDisable(GL_BLEND);
+        }
+
+        if (mFlags & DisplayHardware::SLOW_CONFIG) {
+            glDisable(GL_DITHER);
+        } else {
+            glEnable(GL_DITHER);
+        }
+
+        glTexEnvx(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+        glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+        glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+        glMatrixMode(GL_TEXTURE);
+        glLoadIdentity();
+        glScalef(mWidthScale, mHeightScale, 1);
+        glTranslatef(-x, mYOffset - y, 0);
+        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+        glVertexPointer(2, GL_FLOAT, 0, mVertices);
+        glTexCoordPointer(2, GL_FLOAT, 0, mVertices);
+        while (it != end) {
+            const Rect& r = *it++;
+            const GLint sy = fbHeight - (r.top + r.height());
+            glScissor(r.left, sy, r.width(), r.height());
+            glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+        }
+        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+    }
+}
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
diff --git a/services/surfaceflinger/LayerBlur.h b/services/surfaceflinger/LayerBlur.h
new file mode 100644
index 0000000..4c9ec64
--- /dev/null
+++ b/services/surfaceflinger/LayerBlur.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_LAYER_BLUR_H
+#define ANDROID_LAYER_BLUR_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <ui/Region.h>
+
+#include "LayerBase.h"
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+class LayerBlur : public LayerBaseClient
+{
+public:    
+                LayerBlur(SurfaceFlinger* flinger, DisplayID display,
+                        const sp<Client>& client);
+        virtual ~LayerBlur();
+
+    virtual void onDraw(const Region& clip) const;
+    virtual bool needsBlending() const  { return true; }
+    virtual bool isSecure() const       { return false; }
+    virtual const char* getTypeId() const { return "LayerBlur"; }
+
+    virtual uint32_t doTransaction(uint32_t flags);
+    virtual void setVisibleRegion(const Region& visibleRegion);
+    virtual void unlockPageFlip(const Transform& planeTransform, Region& outDirtyRegion);
+
+private:
+            bool    mCacheDirty;
+    mutable bool    mRefreshCache;
+    mutable bool    mAutoRefreshPending;
+            nsecs_t mCacheAge;
+    mutable GLuint  mTextureName;
+    mutable GLfloat mWidthScale;
+    mutable GLfloat mHeightScale;
+    mutable GLfloat mYOffset;
+    mutable GLint   mReadFormat;
+    mutable GLint   mReadType;
+    mutable uint32_t mBlurFormat;
+};
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
+
+#endif // ANDROID_LAYER_BLUR_H
diff --git a/services/surfaceflinger/LayerBuffer.cpp b/services/surfaceflinger/LayerBuffer.cpp
new file mode 100644
index 0000000..5f83636
--- /dev/null
+++ b/services/surfaceflinger/LayerBuffer.cpp
@@ -0,0 +1,682 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <math.h>
+#include <sys/types.h>
+
+#include <utils/Errors.h>
+#include <utils/Log.h>
+#include <utils/StopWatch.h>
+
+#include <ui/GraphicBuffer.h>
+#include <ui/PixelFormat.h>
+#include <ui/FramebufferNativeWindow.h>
+#include <ui/Rect.h>
+#include <ui/Region.h>
+
+#include <hardware/copybit.h>
+
+#include "LayerBuffer.h"
+#include "SurfaceFlinger.h"
+#include "DisplayHardware/DisplayHardware.h"
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+gralloc_module_t const* LayerBuffer::sGrallocModule = 0;
+
+// ---------------------------------------------------------------------------
+
+LayerBuffer::LayerBuffer(SurfaceFlinger* flinger, DisplayID display,
+        const sp<Client>& client)
+    : LayerBaseClient(flinger, display, client),
+      mNeedsBlending(false), mBlitEngine(0)
+{
+}
+
+LayerBuffer::~LayerBuffer()
+{
+    if (mBlitEngine) {
+        copybit_close(mBlitEngine);
+    }
+}
+
+void LayerBuffer::onFirstRef()
+{
+    LayerBaseClient::onFirstRef();
+    mSurface = new SurfaceLayerBuffer(mFlinger, this);
+
+    hw_module_t const* module = (hw_module_t const*)sGrallocModule;
+    if (!module) {
+        // NOTE: technically there is a race here, but it shouldn't
+        // cause any problem since hw_get_module() always returns
+        // the same value.
+        if (hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module) == 0) {
+            sGrallocModule = (gralloc_module_t const *)module;
+        }
+    }
+
+    if (hw_get_module(COPYBIT_HARDWARE_MODULE_ID, &module) == 0) {
+        copybit_open(module, &mBlitEngine);
+    }
+}
+
+sp<LayerBaseClient::Surface> LayerBuffer::createSurface() const
+{
+    return mSurface;
+}
+
+status_t LayerBuffer::ditch()
+{
+    mSurface.clear();
+    return NO_ERROR;
+}
+
+bool LayerBuffer::needsBlending() const {
+    return mNeedsBlending;
+}
+
+void LayerBuffer::setNeedsBlending(bool blending) {
+    mNeedsBlending = blending;
+}
+
+void LayerBuffer::postBuffer(ssize_t offset)
+{
+    sp<Source> source(getSource());
+    if (source != 0)
+        source->postBuffer(offset);
+}
+
+void LayerBuffer::unregisterBuffers()
+{
+    sp<Source> source(clearSource());
+    if (source != 0)
+        source->unregisterBuffers();
+}
+
+uint32_t LayerBuffer::doTransaction(uint32_t flags)
+{
+    sp<Source> source(getSource());
+    if (source != 0)
+        source->onTransaction(flags);
+    uint32_t res = LayerBase::doTransaction(flags);
+    // we always want filtering for these surfaces
+    mNeedsFiltering = !(mFlags & DisplayHardware::SLOW_CONFIG);
+    return res;
+}
+
+void LayerBuffer::unlockPageFlip(const Transform& planeTransform,
+        Region& outDirtyRegion)
+{
+    // this code-path must be as tight as possible, it's called each time
+    // the screen is composited.
+    sp<Source> source(getSource());
+    if (source != 0)
+        source->onVisibilityResolved(planeTransform);
+    LayerBase::unlockPageFlip(planeTransform, outDirtyRegion);    
+}
+
+void LayerBuffer::onDraw(const Region& clip) const
+{
+    sp<Source> source(getSource());
+    if (LIKELY(source != 0)) {
+        source->onDraw(clip);
+    } else {
+        clearWithOpenGL(clip);
+    }
+}
+
+void LayerBuffer::serverDestroy()
+{
+    sp<Source> source(clearSource());
+    if (source != 0) {
+        source->destroy();
+    }
+}
+
+/**
+ * This creates a "buffer" source for this surface
+ */
+status_t LayerBuffer::registerBuffers(const ISurface::BufferHeap& buffers)
+{
+    Mutex::Autolock _l(mLock);
+    if (mSource != 0)
+        return INVALID_OPERATION;
+
+    sp<BufferSource> source = new BufferSource(*this, buffers);
+
+    status_t result = source->getStatus();
+    if (result == NO_ERROR) {
+        mSource = source;
+    }
+    return result;
+}    
+
+/**
+ * This creates an "overlay" source for this surface
+ */
+sp<OverlayRef> LayerBuffer::createOverlay(uint32_t w, uint32_t h, int32_t f,
+        int32_t orientation)
+{
+    sp<OverlayRef> result;
+    Mutex::Autolock _l(mLock);
+    if (mSource != 0)
+        return result;
+
+    sp<OverlaySource> source = new OverlaySource(*this, &result, w, h, f, orientation);
+    if (result != 0) {
+        mSource = source;
+    }
+    return result;
+}
+
+sp<LayerBuffer::Source> LayerBuffer::getSource() const {
+    Mutex::Autolock _l(mLock);
+    return mSource;
+}
+
+sp<LayerBuffer::Source> LayerBuffer::clearSource() {
+    sp<Source> source;
+    Mutex::Autolock _l(mLock);
+    source = mSource;
+    mSource.clear();
+    return source;
+}
+
+// ============================================================================
+// LayerBuffer::SurfaceLayerBuffer
+// ============================================================================
+
+LayerBuffer::SurfaceLayerBuffer::SurfaceLayerBuffer(
+        const sp<SurfaceFlinger>& flinger, const sp<LayerBuffer>& owner)
+    : LayerBaseClient::Surface(flinger, owner->getIdentity(), owner)
+{
+}
+
+LayerBuffer::SurfaceLayerBuffer::~SurfaceLayerBuffer()
+{
+    unregisterBuffers();
+}
+
+status_t LayerBuffer::SurfaceLayerBuffer::registerBuffers(
+        const ISurface::BufferHeap& buffers)
+{
+    sp<LayerBuffer> owner(getOwner());
+    if (owner != 0)
+        return owner->registerBuffers(buffers);
+    return NO_INIT;
+}
+
+void LayerBuffer::SurfaceLayerBuffer::postBuffer(ssize_t offset)
+{
+    sp<LayerBuffer> owner(getOwner());
+    if (owner != 0)
+        owner->postBuffer(offset);
+}
+
+void LayerBuffer::SurfaceLayerBuffer::unregisterBuffers()
+{
+    sp<LayerBuffer> owner(getOwner());
+    if (owner != 0)
+        owner->unregisterBuffers();
+}
+
+sp<OverlayRef> LayerBuffer::SurfaceLayerBuffer::createOverlay(
+        uint32_t w, uint32_t h, int32_t format, int32_t orientation) {
+    sp<OverlayRef> result;
+    sp<LayerBuffer> owner(getOwner());
+    if (owner != 0)
+        result = owner->createOverlay(w, h, format, orientation);
+    return result;
+}
+
+// ============================================================================
+// LayerBuffer::Buffer
+// ============================================================================
+
+LayerBuffer::Buffer::Buffer(const ISurface::BufferHeap& buffers,
+        ssize_t offset, size_t bufferSize)
+    : mBufferHeap(buffers), mSupportsCopybit(false)
+{
+    NativeBuffer& src(mNativeBuffer);
+    src.crop.l = 0;
+    src.crop.t = 0;
+    src.crop.r = buffers.w;
+    src.crop.b = buffers.h;
+
+    src.img.w       = buffers.hor_stride ?: buffers.w;
+    src.img.h       = buffers.ver_stride ?: buffers.h;
+    src.img.format  = buffers.format;
+    src.img.base    = (void*)(intptr_t(buffers.heap->base()) + offset);
+    src.img.handle  = 0;
+
+    gralloc_module_t const * module = LayerBuffer::getGrallocModule();
+    if (module && module->perform) {
+        int err = module->perform(module,
+                GRALLOC_MODULE_PERFORM_CREATE_HANDLE_FROM_BUFFER,
+                buffers.heap->heapID(), bufferSize,
+                offset, buffers.heap->base(),
+                &src.img.handle);
+
+        // we can fail here is the passed buffer is purely software
+        mSupportsCopybit = (err == NO_ERROR);
+    }
+ }
+
+LayerBuffer::Buffer::~Buffer()
+{
+    NativeBuffer& src(mNativeBuffer);
+    if (src.img.handle) {
+        native_handle_delete(src.img.handle);
+    }
+}
+
+// ============================================================================
+// LayerBuffer::Source
+// LayerBuffer::BufferSource
+// LayerBuffer::OverlaySource
+// ============================================================================
+
+LayerBuffer::Source::Source(LayerBuffer& layer)
+    : mLayer(layer)
+{    
+}
+LayerBuffer::Source::~Source() {    
+}
+void LayerBuffer::Source::onDraw(const Region& clip) const {
+}
+void LayerBuffer::Source::onTransaction(uint32_t flags) {
+}
+void LayerBuffer::Source::onVisibilityResolved(
+        const Transform& planeTransform) {
+}
+void LayerBuffer::Source::postBuffer(ssize_t offset) {
+}
+void LayerBuffer::Source::unregisterBuffers() {
+}
+
+// ---------------------------------------------------------------------------
+
+LayerBuffer::BufferSource::BufferSource(LayerBuffer& layer,
+        const ISurface::BufferHeap& buffers)
+    : Source(layer), mStatus(NO_ERROR), mBufferSize(0)
+{
+    if (buffers.heap == NULL) {
+        // this is allowed, but in this case, it is illegal to receive
+        // postBuffer(). The surface just erases the framebuffer with
+        // fully transparent pixels.
+        mBufferHeap = buffers;
+        mLayer.setNeedsBlending(false);
+        return;
+    }
+
+    status_t err = (buffers.heap->heapID() >= 0) ? NO_ERROR : NO_INIT;
+    if (err != NO_ERROR) {
+        LOGE("LayerBuffer::BufferSource: invalid heap (%s)", strerror(err));
+        mStatus = err;
+        return;
+    }
+    
+    PixelFormatInfo info;
+    err = getPixelFormatInfo(buffers.format, &info);
+    if (err != NO_ERROR) {
+        LOGE("LayerBuffer::BufferSource: invalid format %d (%s)",
+                buffers.format, strerror(err));
+        mStatus = err;
+        return;
+    }
+
+    if (buffers.hor_stride<0 || buffers.ver_stride<0) {
+        LOGE("LayerBuffer::BufferSource: invalid parameters "
+             "(w=%d, h=%d, xs=%d, ys=%d)", 
+             buffers.w, buffers.h, buffers.hor_stride, buffers.ver_stride);
+        mStatus = BAD_VALUE;
+        return;
+    }
+
+    mBufferHeap = buffers;
+    mLayer.setNeedsBlending((info.h_alpha - info.l_alpha) > 0);    
+    mBufferSize = info.getScanlineSize(buffers.hor_stride)*buffers.ver_stride;
+    mLayer.forceVisibilityTransaction();
+}
+
+LayerBuffer::BufferSource::~BufferSource()
+{    
+    class MessageDestroyTexture : public MessageBase {
+        SurfaceFlinger* flinger;
+        GLuint name;
+    public:
+        MessageDestroyTexture(
+                SurfaceFlinger* flinger, GLuint name)
+            : flinger(flinger), name(name) { }
+        virtual bool handler() {
+            glDeleteTextures(1, &name);
+            return true;
+        }
+    };
+
+    if (mTexture.name != -1U) {
+        // GL textures can only be destroyed from the GL thread
+        getFlinger()->mEventQueue.postMessage(
+                new MessageDestroyTexture(getFlinger(), mTexture.name) );
+    }
+    if (mTexture.image != EGL_NO_IMAGE_KHR) {
+        EGLDisplay dpy(getFlinger()->graphicPlane(0).getEGLDisplay());
+        eglDestroyImageKHR(dpy, mTexture.image);
+    }
+}
+
+void LayerBuffer::BufferSource::postBuffer(ssize_t offset)
+{    
+    ISurface::BufferHeap buffers;
+    { // scope for the lock
+        Mutex::Autolock _l(mBufferSourceLock);
+        buffers = mBufferHeap;
+        if (buffers.heap != 0) {
+            const size_t memorySize = buffers.heap->getSize();
+            if ((size_t(offset) + mBufferSize) > memorySize) {
+                LOGE("LayerBuffer::BufferSource::postBuffer() "
+                     "invalid buffer (offset=%d, size=%d, heap-size=%d",
+                     int(offset), int(mBufferSize), int(memorySize));
+                return;
+            }
+        }
+    }
+
+    sp<Buffer> buffer;
+    if (buffers.heap != 0) {
+        buffer = new LayerBuffer::Buffer(buffers, offset, mBufferSize);
+        if (buffer->getStatus() != NO_ERROR)
+            buffer.clear();
+        setBuffer(buffer);
+        mLayer.invalidate();
+    }
+}
+
+void LayerBuffer::BufferSource::unregisterBuffers()
+{
+    Mutex::Autolock _l(mBufferSourceLock);
+    mBufferHeap.heap.clear();
+    mBuffer.clear();
+    mLayer.invalidate();
+}
+
+sp<LayerBuffer::Buffer> LayerBuffer::BufferSource::getBuffer() const
+{
+    Mutex::Autolock _l(mBufferSourceLock);
+    return mBuffer;
+}
+
+void LayerBuffer::BufferSource::setBuffer(const sp<LayerBuffer::Buffer>& buffer)
+{
+    Mutex::Autolock _l(mBufferSourceLock);
+    mBuffer = buffer;
+}
+
+void LayerBuffer::BufferSource::onDraw(const Region& clip) const 
+{
+    sp<Buffer> ourBuffer(getBuffer());
+    if (UNLIKELY(ourBuffer == 0))  {
+        // nothing to do, we don't have a buffer
+        mLayer.clearWithOpenGL(clip);
+        return;
+    }
+
+    status_t err = NO_ERROR;
+    NativeBuffer src(ourBuffer->getBuffer());
+    const Rect transformedBounds(mLayer.getTransformedBounds());
+
+#if defined(EGL_ANDROID_image_native_buffer)
+    if (GLExtensions::getInstance().haveDirectTexture()) {
+        err = INVALID_OPERATION;
+        if (ourBuffer->supportsCopybit()) {
+            copybit_device_t* copybit = mLayer.mBlitEngine;
+            if (copybit && err != NO_ERROR) {
+                // create our EGLImageKHR the first time
+                err = initTempBuffer();
+                if (err == NO_ERROR) {
+                    // NOTE: Assume the buffer is allocated with the proper USAGE flags
+                    const NativeBuffer& dst(mTempBuffer);
+                    region_iterator clip(Region(Rect(dst.crop.r, dst.crop.b)));
+                    copybit->set_parameter(copybit, COPYBIT_TRANSFORM, 0);
+                    copybit->set_parameter(copybit, COPYBIT_PLANE_ALPHA, 0xFF);
+                    copybit->set_parameter(copybit, COPYBIT_DITHER, COPYBIT_ENABLE);
+                    err = copybit->stretch(copybit, &dst.img, &src.img,
+                            &dst.crop, &src.crop, &clip);
+                    if (err != NO_ERROR) {
+                        clearTempBufferImage();
+                    }
+                }
+            }
+        }
+    }
+#endif
+    else {
+        err = INVALID_OPERATION;
+    }
+
+    if (err != NO_ERROR) {
+        // slower fallback
+        GGLSurface t;
+        t.version = sizeof(GGLSurface);
+        t.width  = src.crop.r;
+        t.height = src.crop.b;
+        t.stride = src.img.w;
+        t.vstride= src.img.h;
+        t.format = src.img.format;
+        t.data = (GGLubyte*)src.img.base;
+        const Region dirty(Rect(t.width, t.height));
+        mTextureManager.loadTexture(&mTexture, dirty, t);
+    }
+
+    mTexture.transform = mBufferHeap.transform;
+    mLayer.drawWithOpenGL(clip, mTexture);
+}
+
+status_t LayerBuffer::BufferSource::initTempBuffer() const
+{
+    // figure out the size we need now
+    const ISurface::BufferHeap& buffers(mBufferHeap);
+    uint32_t w = mLayer.mTransformedBounds.width();
+    uint32_t h = mLayer.mTransformedBounds.height();
+    if (buffers.w * h != buffers.h * w) {
+        int t = w; w = h; h = t;
+    }
+
+    // we're in the copybit case, so make sure we can handle this blit
+    // we don't have to keep the aspect ratio here
+    copybit_device_t* copybit = mLayer.mBlitEngine;
+    const int down = copybit->get(copybit, COPYBIT_MINIFICATION_LIMIT);
+    const int up = copybit->get(copybit, COPYBIT_MAGNIFICATION_LIMIT);
+    if (buffers.w > w*down)     w = buffers.w / down;
+    else if (w > buffers.w*up)  w = buffers.w*up;
+    if (buffers.h > h*down)     h = buffers.h / down;
+    else if (h > buffers.h*up)  h = buffers.h*up;
+
+    if (mTexture.image != EGL_NO_IMAGE_KHR) {
+        // we have an EGLImage, make sure the needed size didn't change
+        if (w!=mTexture.width || h!= mTexture.height) {
+            // delete the EGLImage and texture
+            clearTempBufferImage();
+        } else {
+            // we're good, we have an EGLImageKHR and it's (still) the
+            // right size
+            return NO_ERROR;
+        }
+    }
+
+    // figure out if we need linear filtering
+    if (buffers.w * h == buffers.h * w) {
+        // same pixel area, don't use filtering
+        mLayer.mNeedsFiltering = false;
+    }
+
+    // Allocate a temporary buffer and create the corresponding EGLImageKHR
+    // once the EGLImage has been created we don't need the
+    // graphic buffer reference anymore.
+    sp<GraphicBuffer> buffer = new GraphicBuffer(
+            w, h, HAL_PIXEL_FORMAT_RGB_565,
+            GraphicBuffer::USAGE_HW_TEXTURE |
+            GraphicBuffer::USAGE_HW_2D);
+
+    status_t err = buffer->initCheck();
+    if (err == NO_ERROR) {
+        NativeBuffer& dst(mTempBuffer);
+        dst.img.w = buffer->getStride();
+        dst.img.h = h;
+        dst.img.format = buffer->getPixelFormat();
+        dst.img.handle = (native_handle_t *)buffer->handle;
+        dst.img.base = 0;
+        dst.crop.l = 0;
+        dst.crop.t = 0;
+        dst.crop.r = w;
+        dst.crop.b = h;
+
+        EGLDisplay dpy(getFlinger()->graphicPlane(0).getEGLDisplay());
+        err = mTextureManager.initEglImage(&mTexture, dpy, buffer);
+    }
+
+    return err;
+}
+
+void LayerBuffer::BufferSource::clearTempBufferImage() const
+{
+    // delete the image
+    EGLDisplay dpy(getFlinger()->graphicPlane(0).getEGLDisplay());
+    eglDestroyImageKHR(dpy, mTexture.image);
+
+    // and the associated texture (recreate a name)
+    glDeleteTextures(1, &mTexture.name);
+    Texture defaultTexture;
+    mTexture = defaultTexture;
+}
+
+// ---------------------------------------------------------------------------
+
+LayerBuffer::OverlaySource::OverlaySource(LayerBuffer& layer,
+        sp<OverlayRef>* overlayRef, 
+        uint32_t w, uint32_t h, int32_t format, int32_t orientation)
+    : Source(layer), mVisibilityChanged(false),
+    mOverlay(0), mOverlayHandle(0), mOverlayDevice(0), mOrientation(orientation)
+{
+    overlay_control_device_t* overlay_dev = getFlinger()->getOverlayEngine();
+    if (overlay_dev == NULL) {
+        // overlays not supported
+        return;
+    }
+
+    mOverlayDevice = overlay_dev;
+    overlay_t* overlay = overlay_dev->createOverlay(overlay_dev, w, h, format);
+    if (overlay == NULL) {
+        // couldn't create the overlay (no memory? no more overlays?)
+        return;
+    }
+
+    // enable dithering...
+    overlay_dev->setParameter(overlay_dev, overlay, 
+            OVERLAY_DITHER, OVERLAY_ENABLE);
+
+    mOverlay = overlay;
+    mWidth = overlay->w;
+    mHeight = overlay->h;
+    mFormat = overlay->format; 
+    mWidthStride = overlay->w_stride;
+    mHeightStride = overlay->h_stride;
+    mInitialized = false;
+
+    mOverlayHandle = overlay->getHandleRef(overlay);
+    
+    sp<OverlayChannel> channel = new OverlayChannel( &layer );
+
+    *overlayRef = new OverlayRef(mOverlayHandle, channel,
+            mWidth, mHeight, mFormat, mWidthStride, mHeightStride);
+    getFlinger()->signalEvent();
+}
+
+LayerBuffer::OverlaySource::~OverlaySource()
+{
+    if (mOverlay && mOverlayDevice) {
+        overlay_control_device_t* overlay_dev = mOverlayDevice;
+        overlay_dev->destroyOverlay(overlay_dev, mOverlay);
+    }
+}
+
+void LayerBuffer::OverlaySource::onDraw(const Region& clip) const
+{
+    // this would be where the color-key would be set, should we need it.
+    GLclampf red = 0;
+    GLclampf green = 0;
+    GLclampf blue = 0;
+    mLayer.clearWithOpenGL(clip, red, green, blue, 0);
+}
+
+void LayerBuffer::OverlaySource::onTransaction(uint32_t flags)
+{
+    const Layer::State& front(mLayer.drawingState());
+    const Layer::State& temp(mLayer.currentState());
+    if (temp.sequence != front.sequence) {
+        mVisibilityChanged = true;
+    }
+}
+
+void LayerBuffer::OverlaySource::onVisibilityResolved(
+        const Transform& planeTransform)
+{
+    // this code-path must be as tight as possible, it's called each time
+    // the screen is composited.
+    if (UNLIKELY(mOverlay != 0)) {
+        if (mVisibilityChanged || !mInitialized) {
+            mVisibilityChanged = false;
+            mInitialized = true;
+            const Rect bounds(mLayer.getTransformedBounds());
+            int x = bounds.left;
+            int y = bounds.top;
+            int w = bounds.width();
+            int h = bounds.height();
+            
+            // we need a lock here to protect "destroy"
+            Mutex::Autolock _l(mOverlaySourceLock);
+            if (mOverlay) {
+                overlay_control_device_t* overlay_dev = mOverlayDevice;
+                overlay_dev->setPosition(overlay_dev, mOverlay, x,y,w,h);
+                // we need to combine the layer orientation and the
+                // user-requested orientation.
+                Transform finalTransform = Transform(mOrientation) *
+                        Transform(mLayer.getOrientation());
+                overlay_dev->setParameter(overlay_dev, mOverlay,
+                        OVERLAY_TRANSFORM, finalTransform.getOrientation());
+                overlay_dev->commit(overlay_dev, mOverlay);
+            }
+        }
+    }
+}
+
+void LayerBuffer::OverlaySource::destroy()
+{
+    // we need a lock here to protect "onVisibilityResolved"
+    Mutex::Autolock _l(mOverlaySourceLock);
+    if (mOverlay && mOverlayDevice) {
+        overlay_control_device_t* overlay_dev = mOverlayDevice;
+        overlay_dev->destroyOverlay(overlay_dev, mOverlay);
+        mOverlay = 0;
+    }
+}
+
+// ---------------------------------------------------------------------------
+}; // namespace android
diff --git a/services/surfaceflinger/LayerBuffer.h b/services/surfaceflinger/LayerBuffer.h
new file mode 100644
index 0000000..1c0bf83
--- /dev/null
+++ b/services/surfaceflinger/LayerBuffer.h
@@ -0,0 +1,220 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_LAYER_BUFFER_H
+#define ANDROID_LAYER_BUFFER_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include "LayerBase.h"
+#include "TextureManager.h"
+
+struct copybit_device_t;
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+class Buffer;
+class Region;
+class OverlayRef;
+
+// ---------------------------------------------------------------------------
+
+class LayerBuffer : public LayerBaseClient
+{
+    class Source : public LightRefBase<Source> {
+    public:
+        Source(LayerBuffer& layer);
+        virtual ~Source();
+        virtual void onDraw(const Region& clip) const;
+        virtual void onTransaction(uint32_t flags);
+        virtual void onVisibilityResolved(const Transform& planeTransform);
+        virtual void postBuffer(ssize_t offset);
+        virtual void unregisterBuffers();
+        virtual void destroy() { }
+        SurfaceFlinger* getFlinger() const { return mLayer.mFlinger.get(); }
+    protected:
+        LayerBuffer& mLayer;
+    };
+
+public:
+            LayerBuffer(SurfaceFlinger* flinger, DisplayID display,
+                    const sp<Client>& client);
+        virtual ~LayerBuffer();
+
+    virtual void onFirstRef();
+    virtual bool needsBlending() const;
+    virtual const char* getTypeId() const { return "LayerBuffer"; }
+
+    virtual sp<LayerBaseClient::Surface> createSurface() const;
+    virtual status_t ditch();
+    virtual void onDraw(const Region& clip) const;
+    virtual uint32_t doTransaction(uint32_t flags);
+    virtual void unlockPageFlip(const Transform& planeTransform, Region& outDirtyRegion);
+
+    status_t registerBuffers(const ISurface::BufferHeap& buffers);
+    void postBuffer(ssize_t offset);
+    void unregisterBuffers();
+    sp<OverlayRef> createOverlay(uint32_t w, uint32_t h, int32_t format,
+            int32_t orientation);
+    
+    sp<Source> getSource() const;
+    sp<Source> clearSource();
+    void setNeedsBlending(bool blending);
+    Rect getTransformedBounds() const {
+        return mTransformedBounds;
+    }
+
+    void serverDestroy();
+
+private:
+    struct NativeBuffer {
+        copybit_image_t   img;
+        copybit_rect_t    crop;
+    };
+
+    static gralloc_module_t const* sGrallocModule;
+    static gralloc_module_t const* getGrallocModule() {
+        return sGrallocModule;
+    }
+
+    class Buffer : public LightRefBase<Buffer> {
+    public:
+        Buffer(const ISurface::BufferHeap& buffers,
+                ssize_t offset, size_t bufferSize);
+        inline bool supportsCopybit() const {
+            return mSupportsCopybit;
+        }
+        inline status_t getStatus() const {
+            return mBufferHeap.heap!=0 ? NO_ERROR : NO_INIT;
+        }
+        inline const NativeBuffer& getBuffer() const {
+            return mNativeBuffer;
+        }
+    protected:
+        friend class LightRefBase<Buffer>;
+        Buffer& operator = (const Buffer& rhs);
+        Buffer(const Buffer& rhs);
+        ~Buffer();
+    private:
+        ISurface::BufferHeap    mBufferHeap;
+        NativeBuffer            mNativeBuffer;
+        bool                    mSupportsCopybit;
+    };
+
+    class BufferSource : public Source {
+    public:
+        BufferSource(LayerBuffer& layer, const ISurface::BufferHeap& buffers);
+        virtual ~BufferSource();
+
+        status_t getStatus() const { return mStatus; }
+        sp<Buffer> getBuffer() const;
+        void setBuffer(const sp<Buffer>& buffer);
+
+        virtual void onDraw(const Region& clip) const;
+        virtual void postBuffer(ssize_t offset);
+        virtual void unregisterBuffers();
+        virtual void destroy() { }
+    private:
+        status_t initTempBuffer() const;
+        void clearTempBufferImage() const;
+        mutable Mutex                   mBufferSourceLock;
+        sp<Buffer>                      mBuffer;
+        status_t                        mStatus;
+        ISurface::BufferHeap            mBufferHeap;
+        size_t                          mBufferSize;
+        mutable Texture                 mTexture;
+        mutable NativeBuffer            mTempBuffer;
+        mutable TextureManager          mTextureManager;
+    };
+    
+    class OverlaySource : public Source {
+    public:
+        OverlaySource(LayerBuffer& layer,
+                sp<OverlayRef>* overlayRef, 
+                uint32_t w, uint32_t h, int32_t format, int32_t orientation);
+        virtual ~OverlaySource();
+        virtual void onDraw(const Region& clip) const;
+        virtual void onTransaction(uint32_t flags);
+        virtual void onVisibilityResolved(const Transform& planeTransform);
+        virtual void destroy();
+    private:
+
+        class OverlayChannel : public BnOverlay {
+            wp<LayerBuffer> mLayer;
+            virtual void destroy() {
+                sp<LayerBuffer> layer(mLayer.promote());
+                if (layer != 0) {
+                    layer->serverDestroy();
+                }
+            }
+        public:
+            OverlayChannel(const sp<LayerBuffer>& layer)
+                : mLayer(layer) {
+            }
+        };
+        
+        friend class OverlayChannel;
+        bool mVisibilityChanged;
+
+        overlay_t* mOverlay;        
+        overlay_handle_t mOverlayHandle;
+        overlay_control_device_t* mOverlayDevice;
+        uint32_t mWidth;
+        uint32_t mHeight;
+        int32_t mFormat;
+        int32_t mWidthStride;
+        int32_t mHeightStride;
+        int32_t mOrientation;
+        mutable Mutex mOverlaySourceLock;
+        bool mInitialized;
+    };
+
+
+    class SurfaceLayerBuffer : public LayerBaseClient::Surface
+    {
+    public:
+        SurfaceLayerBuffer(const sp<SurfaceFlinger>& flinger,
+                        const sp<LayerBuffer>& owner);
+        virtual ~SurfaceLayerBuffer();
+
+        virtual status_t registerBuffers(const ISurface::BufferHeap& buffers);
+        virtual void postBuffer(ssize_t offset);
+        virtual void unregisterBuffers();
+        
+        virtual sp<OverlayRef> createOverlay(
+                uint32_t w, uint32_t h, int32_t format, int32_t orientation);
+    private:
+        sp<LayerBuffer> getOwner() const {
+            return static_cast<LayerBuffer*>(Surface::getOwner().get());
+        }
+    };
+
+    mutable Mutex   mLock;
+    sp<Source>      mSource;
+    sp<Surface>     mSurface;
+    bool            mInvalidate;
+    bool            mNeedsBlending;
+    copybit_device_t* mBlitEngine;
+};
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
+
+#endif // ANDROID_LAYER_BUFFER_H
diff --git a/services/surfaceflinger/LayerDim.cpp b/services/surfaceflinger/LayerDim.cpp
new file mode 100644
index 0000000..a1f339e
--- /dev/null
+++ b/services/surfaceflinger/LayerDim.cpp
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <utils/Errors.h>
+#include <utils/Log.h>
+
+#include <ui/GraphicBuffer.h>
+
+#include "LayerDim.h"
+#include "SurfaceFlinger.h"
+#include "DisplayHardware/DisplayHardware.h"
+
+namespace android {
+// ---------------------------------------------------------------------------
+
+bool LayerDim::sUseTexture;
+GLuint LayerDim::sTexId;
+EGLImageKHR LayerDim::sImage;
+int32_t LayerDim::sWidth;
+int32_t LayerDim::sHeight;
+
+// ---------------------------------------------------------------------------
+
+LayerDim::LayerDim(SurfaceFlinger* flinger, DisplayID display,
+        const sp<Client>& client)
+    : LayerBaseClient(flinger, display, client)
+{
+}
+
+void LayerDim::initDimmer(SurfaceFlinger* flinger, uint32_t w, uint32_t h)
+{
+    sTexId = -1;
+    sImage = EGL_NO_IMAGE_KHR;
+    sWidth = w;
+    sHeight = h;
+    sUseTexture = false;
+}
+
+LayerDim::~LayerDim()
+{
+}
+
+void LayerDim::onDraw(const Region& clip) const
+{
+    const State& s(drawingState());
+    Region::const_iterator it = clip.begin();
+    Region::const_iterator const end = clip.end();
+    if (s.alpha>0 && (it != end)) {
+        const DisplayHardware& hw(graphicPlane(0).displayHardware());
+        const GLfloat alpha = s.alpha/255.0f;
+        const uint32_t fbHeight = hw.getHeight();
+        glDisable(GL_DITHER);
+        glEnable(GL_BLEND);
+        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
+        glColor4f(0, 0, 0, alpha);
+
+#if defined(GL_OES_texture_external)
+        if (GLExtensions::getInstance().haveTextureExternal()) {
+            glDisable(GL_TEXTURE_EXTERNAL_OES);
+        }
+#endif
+        glDisable(GL_TEXTURE_2D);
+
+        GLshort w = sWidth;
+        GLshort h = sHeight;
+        const GLshort vertices[4][2] = {
+                { 0, 0 },
+                { 0, h },
+                { w, h },
+                { w, 0 }
+        };
+        glVertexPointer(2, GL_SHORT, 0, vertices);
+
+        while (it != end) {
+            const Rect& r = *it++;
+            const GLint sy = fbHeight - (r.top + r.height());
+            glScissor(r.left, sy, r.width(), r.height());
+            glDrawArrays(GL_TRIANGLE_FAN, 0, 4); 
+        }
+    }
+    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+}
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
diff --git a/services/surfaceflinger/LayerDim.h b/services/surfaceflinger/LayerDim.h
new file mode 100644
index 0000000..f032314
--- /dev/null
+++ b/services/surfaceflinger/LayerDim.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_LAYER_DIM_H
+#define ANDROID_LAYER_DIM_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+
+#include "LayerBase.h"
+
+// ---------------------------------------------------------------------------
+
+namespace android {
+
+class LayerDim : public LayerBaseClient
+{
+    static bool sUseTexture;
+    static GLuint sTexId;
+    static EGLImageKHR sImage;
+    static int32_t sWidth;
+    static int32_t sHeight;
+public:    
+                LayerDim(SurfaceFlinger* flinger, DisplayID display,
+                        const sp<Client>& client);
+        virtual ~LayerDim();
+
+    virtual void onDraw(const Region& clip) const;
+    virtual bool needsBlending() const  { return true; }
+    virtual bool isSecure() const       { return false; }
+    virtual const char* getTypeId() const { return "LayerDim"; }
+
+    static void initDimmer(SurfaceFlinger* flinger, uint32_t w, uint32_t h);
+};
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
+
+#endif // ANDROID_LAYER_DIM_H
diff --git a/services/surfaceflinger/MODULE_LICENSE_APACHE2 b/services/surfaceflinger/MODULE_LICENSE_APACHE2
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/services/surfaceflinger/MODULE_LICENSE_APACHE2
diff --git a/services/surfaceflinger/MessageQueue.cpp b/services/surfaceflinger/MessageQueue.cpp
new file mode 100644
index 0000000..d668e88
--- /dev/null
+++ b/services/surfaceflinger/MessageQueue.cpp
@@ -0,0 +1,193 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdint.h>
+#include <errno.h>
+#include <sys/types.h>
+
+#include <utils/threads.h>
+#include <utils/Timers.h>
+#include <utils/Log.h>
+#include <binder/IPCThreadState.h>
+
+#include "MessageQueue.h"
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+void MessageList::insert(const sp<MessageBase>& node) 
+{
+    LIST::iterator cur(mList.begin());
+    LIST::iterator end(mList.end());
+    while (cur != end) {
+        if (*node < **cur) {
+            mList.insert(cur, node);
+            return;
+        }
+        ++cur;
+    }
+    mList.insert(++end, node);
+}
+
+void MessageList::remove(MessageList::LIST::iterator pos) 
+{
+    mList.erase(pos);
+}
+
+// ---------------------------------------------------------------------------
+
+MessageQueue::MessageQueue()
+    : mInvalidate(false)
+{
+    mInvalidateMessage = new MessageBase(INVALIDATE);
+}
+
+MessageQueue::~MessageQueue()
+{
+}
+
+sp<MessageBase> MessageQueue::waitMessage(nsecs_t timeout)
+{
+    sp<MessageBase> result;
+
+    bool again;
+    do {
+        const nsecs_t timeoutTime = systemTime() + timeout;
+        while (true) {
+            Mutex::Autolock _l(mLock);
+            nsecs_t now = systemTime();
+            nsecs_t nextEventTime = -1;
+
+            // invalidate messages are always handled first
+            if (mInvalidate) {
+                mInvalidate = false;
+                mInvalidateMessage->when = now;
+                result = mInvalidateMessage;
+                break;
+            }
+
+            LIST::iterator cur(mMessages.begin());
+            if (cur != mMessages.end()) {
+                result = *cur;
+            }
+            
+            if (result != 0) {
+                if (result->when <= now) {
+                    // there is a message to deliver
+                    mMessages.remove(cur);
+                    break;
+                }
+                if (timeout>=0 && timeoutTime < now) {
+                    // we timed-out, return a NULL message
+                    result = 0;
+                    break;
+                }
+                nextEventTime = result->when;
+                result = 0;
+            }
+
+            if (timeout >= 0 && nextEventTime > 0) {
+                if (nextEventTime > timeoutTime) {
+                    nextEventTime = timeoutTime;
+                }
+            }
+
+            if (nextEventTime >= 0) {
+                //LOGD("nextEventTime = %lld ms", nextEventTime);
+                if (nextEventTime > 0) {
+                    // we're about to wait, flush the binder command buffer
+                    IPCThreadState::self()->flushCommands();
+                    const nsecs_t reltime = nextEventTime - systemTime();
+                    if (reltime > 0) {
+                        mCondition.waitRelative(mLock, reltime);
+                    }
+                }
+            } else {
+                //LOGD("going to wait");
+                // we're about to wait, flush the binder command buffer
+                IPCThreadState::self()->flushCommands();
+                mCondition.wait(mLock);
+            }
+        } 
+        // here we're not holding the lock anymore
+
+        if (result == 0)
+            break;
+
+        again = result->handler();
+        if (again) {
+            // the message has been processed. release our reference to it
+            // without holding the lock.
+            result->notify();
+            result = 0;
+        }
+        
+    } while (again);
+
+    return result;
+}
+
+status_t MessageQueue::postMessage(
+        const sp<MessageBase>& message, nsecs_t relTime, uint32_t flags)
+{
+    return queueMessage(message, relTime, flags);
+}
+
+status_t MessageQueue::invalidate() {
+    Mutex::Autolock _l(mLock);
+    mInvalidate = true;
+    mCondition.signal();
+    return NO_ERROR;
+}
+
+status_t MessageQueue::queueMessage(
+        const sp<MessageBase>& message, nsecs_t relTime, uint32_t flags)
+{
+    Mutex::Autolock _l(mLock);
+    message->when = systemTime() + relTime;
+    mMessages.insert(message);
+    
+    //LOGD("MessageQueue::queueMessage time = %lld ms", message->when);
+    //dumpLocked(message);
+
+    mCondition.signal();
+    return NO_ERROR;
+}
+
+void MessageQueue::dump(const sp<MessageBase>& message)
+{
+    Mutex::Autolock _l(mLock);
+    dumpLocked(message);
+}
+
+void MessageQueue::dumpLocked(const sp<MessageBase>& message)
+{
+    LIST::const_iterator cur(mMessages.begin());
+    LIST::const_iterator end(mMessages.end());
+    int c = 0;
+    while (cur != end) {
+        const char tick = (*cur == message) ? '>' : ' ';
+        LOGD("%c %d: msg{.what=%08x, when=%lld}",
+                tick, c, (*cur)->what, (*cur)->when);
+        ++cur;
+        c++;
+    }
+}
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
diff --git a/services/surfaceflinger/MessageQueue.h b/services/surfaceflinger/MessageQueue.h
new file mode 100644
index 0000000..890f809
--- /dev/null
+++ b/services/surfaceflinger/MessageQueue.h
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_MESSAGE_QUEUE_H
+#define ANDROID_MESSAGE_QUEUE_H
+
+#include <stdint.h>
+#include <errno.h>
+#include <sys/types.h>
+
+#include <utils/threads.h>
+#include <utils/Timers.h>
+#include <utils/List.h>
+
+#include "Barrier.h"
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+class MessageBase;
+
+class MessageList 
+{
+    List< sp<MessageBase> > mList;
+    typedef List< sp<MessageBase> > LIST;
+public:
+    inline LIST::iterator begin()                { return mList.begin(); }
+    inline LIST::const_iterator begin() const    { return mList.begin(); }
+    inline LIST::iterator end()                  { return mList.end(); }
+    inline LIST::const_iterator end() const      { return mList.end(); }
+    inline bool isEmpty() const { return mList.empty(); }
+    void insert(const sp<MessageBase>& node);
+    void remove(LIST::iterator pos);
+};
+
+// ============================================================================
+
+class MessageBase : 
+    public LightRefBase<MessageBase>
+{
+public:
+    nsecs_t     when;
+    uint32_t    what;
+    int32_t     arg0;    
+
+    MessageBase() : when(0), what(0), arg0(0) { }
+    MessageBase(uint32_t what, int32_t arg0=0)
+        : when(0), what(what), arg0(arg0) { }
+    
+    // return true if message has a handler
+    virtual bool handler() { return false; }
+
+    // waits for the handler to be processed
+    void wait() const { barrier.wait(); }
+    
+    // releases all waiters. this is done automatically if
+    // handler returns true
+    void notify() const { barrier.open(); }
+
+protected:
+    virtual ~MessageBase() { }
+
+private:
+    mutable Barrier barrier;
+    friend class LightRefBase<MessageBase>;
+};
+
+inline bool operator < (const MessageBase& lhs, const MessageBase& rhs) {
+    return lhs.when < rhs.when;
+}
+
+// ---------------------------------------------------------------------------
+
+class MessageQueue
+{
+    typedef List< sp<MessageBase> > LIST;
+public:
+
+    MessageQueue();
+    ~MessageQueue();
+
+    // pre-defined messages
+    enum {
+        INVALIDATE = '_upd'
+    };
+
+    sp<MessageBase> waitMessage(nsecs_t timeout = -1);
+    
+    status_t postMessage(const sp<MessageBase>& message,
+            nsecs_t reltime=0, uint32_t flags = 0);
+
+    status_t invalidate();
+    
+    void dump(const sp<MessageBase>& message);
+
+private:
+    status_t queueMessage(const sp<MessageBase>& message,
+            nsecs_t reltime, uint32_t flags);
+    void dumpLocked(const sp<MessageBase>& message);
+    
+    Mutex           mLock;
+    Condition       mCondition;
+    MessageList     mMessages;
+    bool            mInvalidate;
+    sp<MessageBase> mInvalidateMessage;
+};
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
+
+#endif /* ANDROID_MESSAGE_QUEUE_H */
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
new file mode 100644
index 0000000..68e8f19
--- /dev/null
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -0,0 +1,1909 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <math.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+
+#include <cutils/log.h>
+#include <cutils/properties.h>
+
+#include <binder/IPCThreadState.h>
+#include <binder/IServiceManager.h>
+#include <binder/MemoryHeapBase.h>
+
+#include <utils/String8.h>
+#include <utils/String16.h>
+#include <utils/StopWatch.h>
+
+#include <ui/GraphicBufferAllocator.h>
+#include <ui/PixelFormat.h>
+
+#include <pixelflinger/pixelflinger.h>
+#include <GLES/gl.h>
+
+#include "clz.h"
+#include "GLExtensions.h"
+#include "Layer.h"
+#include "LayerBlur.h"
+#include "LayerBuffer.h"
+#include "LayerDim.h"
+#include "SurfaceFlinger.h"
+
+#include "DisplayHardware/DisplayHardware.h"
+
+/* ideally AID_GRAPHICS would be in a semi-public header
+ * or there would be a way to map a user/group name to its id
+ */
+#ifndef AID_GRAPHICS
+#define AID_GRAPHICS 1003
+#endif
+
+#define DISPLAY_COUNT       1
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+void SurfaceFlinger::instantiate() {
+    defaultServiceManager()->addService(
+            String16("SurfaceFlinger"), new SurfaceFlinger());
+}
+
+void SurfaceFlinger::shutdown() {
+    // we should unregister here, but not really because
+    // when (if) the service manager goes away, all the services
+    // it has a reference to will leave too.
+}
+
+// ---------------------------------------------------------------------------
+
+SurfaceFlinger::LayerVector::LayerVector(const SurfaceFlinger::LayerVector& rhs)
+    : lookup(rhs.lookup), layers(rhs.layers)
+{
+}
+
+ssize_t SurfaceFlinger::LayerVector::indexOf(
+        const sp<LayerBase>& key, size_t guess) const
+{
+    if (guess<size() && lookup.keyAt(guess) == key)
+        return guess;
+    const ssize_t i = lookup.indexOfKey(key);
+    if (i>=0) {
+        const size_t idx = lookup.valueAt(i);
+        LOGE_IF(layers[idx]!=key,
+            "LayerVector[%p]: layers[%d]=%p, key=%p",
+            this, int(idx), layers[idx].get(), key.get());
+        return idx;
+    }
+    return i;
+}
+
+ssize_t SurfaceFlinger::LayerVector::add(
+        const sp<LayerBase>& layer,
+        Vector< sp<LayerBase> >::compar_t cmp)
+{
+    size_t count = layers.size();
+    ssize_t l = 0;
+    ssize_t h = count-1;
+    ssize_t mid;
+    sp<LayerBase> const* a = layers.array();
+    while (l <= h) {
+        mid = l + (h - l)/2;
+        const int c = cmp(a+mid, &layer);
+        if (c == 0)     { l = mid; break; }
+        else if (c<0)   { l = mid+1; }
+        else            { h = mid-1; }
+    }
+    size_t order = l;
+    while (order<count && !cmp(&layer, a+order)) {
+        order++;
+    }
+    count = lookup.size();
+    for (size_t i=0 ; i<count ; i++) {
+        if (lookup.valueAt(i) >= order) {
+            lookup.editValueAt(i)++;
+        }
+    }
+    layers.insertAt(layer, order);
+    lookup.add(layer, order);
+    return order;
+}
+
+ssize_t SurfaceFlinger::LayerVector::remove(const sp<LayerBase>& layer)
+{
+    const ssize_t keyIndex = lookup.indexOfKey(layer);
+    if (keyIndex >= 0) {
+        const size_t index = lookup.valueAt(keyIndex);
+        LOGE_IF(layers[index]!=layer,
+                "LayerVector[%p]: layers[%u]=%p, layer=%p",
+                this, int(index), layers[index].get(), layer.get());
+        layers.removeItemsAt(index);
+        lookup.removeItemsAt(keyIndex);
+        const size_t count = lookup.size();
+        for (size_t i=0 ; i<count ; i++) {
+            if (lookup.valueAt(i) >= size_t(index)) {
+                lookup.editValueAt(i)--;
+            }
+        }
+        return index;
+    }
+    return NAME_NOT_FOUND;
+}
+
+ssize_t SurfaceFlinger::LayerVector::reorder(
+        const sp<LayerBase>& layer,
+        Vector< sp<LayerBase> >::compar_t cmp)
+{
+    // XXX: it's a little lame. but oh well...
+    ssize_t err = remove(layer);
+    if (err >=0)
+        err = add(layer, cmp);
+    return err;
+}
+
+// ---------------------------------------------------------------------------
+#if 0
+#pragma mark -
+#endif
+
+SurfaceFlinger::SurfaceFlinger()
+    :   BnSurfaceComposer(), Thread(false),
+        mTransactionFlags(0),
+        mTransactionCount(0),
+        mResizeTransationPending(false),
+        mLayersRemoved(false),
+        mBootTime(systemTime()),
+        mHardwareTest("android.permission.HARDWARE_TEST"),
+        mAccessSurfaceFlinger("android.permission.ACCESS_SURFACE_FLINGER"),
+        mDump("android.permission.DUMP"),
+        mVisibleRegionsDirty(false),
+        mDeferReleaseConsole(false),
+        mFreezeDisplay(false),
+        mFreezeCount(0),
+        mFreezeDisplayTime(0),
+        mDebugRegion(0),
+        mDebugBackground(0),
+        mDebugInSwapBuffers(0),
+        mLastSwapBufferTime(0),
+        mDebugInTransaction(0),
+        mLastTransactionTime(0),
+        mBootFinished(false),
+        mConsoleSignals(0),
+        mSecureFrameBuffer(0)
+{
+    init();
+}
+
+void SurfaceFlinger::init()
+{
+    LOGI("SurfaceFlinger is starting");
+
+    // debugging stuff...
+    char value[PROPERTY_VALUE_MAX];
+    property_get("debug.sf.showupdates", value, "0");
+    mDebugRegion = atoi(value);
+    property_get("debug.sf.showbackground", value, "0");
+    mDebugBackground = atoi(value);
+
+    LOGI_IF(mDebugRegion,       "showupdates enabled");
+    LOGI_IF(mDebugBackground,   "showbackground enabled");
+}
+
+SurfaceFlinger::~SurfaceFlinger()
+{
+    glDeleteTextures(1, &mWormholeTexName);
+}
+
+overlay_control_device_t* SurfaceFlinger::getOverlayEngine() const
+{
+    return graphicPlane(0).displayHardware().getOverlayEngine();
+}
+
+sp<IMemoryHeap> SurfaceFlinger::getCblk() const
+{
+    return mServerHeap;
+}
+
+sp<ISurfaceComposerClient> SurfaceFlinger::createConnection()
+{
+    sp<ISurfaceComposerClient> bclient;
+    sp<Client> client(new Client(this));
+    status_t err = client->initCheck();
+    if (err == NO_ERROR) {
+        bclient = client;
+    }
+    return bclient;
+}
+
+sp<ISurfaceComposerClient> SurfaceFlinger::createClientConnection()
+{
+    sp<ISurfaceComposerClient> bclient;
+    sp<UserClient> client(new UserClient(this));
+    status_t err = client->initCheck();
+    if (err == NO_ERROR) {
+        bclient = client;
+    }
+    return bclient;
+}
+
+
+const GraphicPlane& SurfaceFlinger::graphicPlane(int dpy) const
+{
+    LOGE_IF(uint32_t(dpy) >= DISPLAY_COUNT, "Invalid DisplayID %d", dpy);
+    const GraphicPlane& plane(mGraphicPlanes[dpy]);
+    return plane;
+}
+
+GraphicPlane& SurfaceFlinger::graphicPlane(int dpy)
+{
+    return const_cast<GraphicPlane&>(
+        const_cast<SurfaceFlinger const *>(this)->graphicPlane(dpy));
+}
+
+void SurfaceFlinger::bootFinished()
+{
+    const nsecs_t now = systemTime();
+    const nsecs_t duration = now - mBootTime;
+    LOGI("Boot is finished (%ld ms)", long(ns2ms(duration)) );  
+    mBootFinished = true;
+    property_set("ctl.stop", "bootanim");
+}
+
+void SurfaceFlinger::onFirstRef()
+{
+    run("SurfaceFlinger", PRIORITY_URGENT_DISPLAY);
+
+    // Wait for the main thread to be done with its initialization
+    mReadyToRunBarrier.wait();
+}
+
+static inline uint16_t pack565(int r, int g, int b) {
+    return (r<<11)|(g<<5)|b;
+}
+
+status_t SurfaceFlinger::readyToRun()
+{
+    LOGI(   "SurfaceFlinger's main thread ready to run. "
+            "Initializing graphics H/W...");
+
+    // we only support one display currently
+    int dpy = 0;
+
+    {
+        // initialize the main display
+        GraphicPlane& plane(graphicPlane(dpy));
+        DisplayHardware* const hw = new DisplayHardware(this, dpy);
+        plane.setDisplayHardware(hw);
+    }
+
+    // create the shared control-block
+    mServerHeap = new MemoryHeapBase(4096,
+            MemoryHeapBase::READ_ONLY, "SurfaceFlinger read-only heap");
+    LOGE_IF(mServerHeap==0, "can't create shared memory dealer");
+    
+    mServerCblk = static_cast<surface_flinger_cblk_t*>(mServerHeap->getBase());
+    LOGE_IF(mServerCblk==0, "can't get to shared control block's address");
+    
+    new(mServerCblk) surface_flinger_cblk_t;
+
+    // initialize primary screen
+    // (other display should be initialized in the same manner, but
+    // asynchronously, as they could come and go. None of this is supported
+    // yet).
+    const GraphicPlane& plane(graphicPlane(dpy));
+    const DisplayHardware& hw = plane.displayHardware();
+    const uint32_t w = hw.getWidth();
+    const uint32_t h = hw.getHeight();
+    const uint32_t f = hw.getFormat();
+    hw.makeCurrent();
+
+    // initialize the shared control block
+    mServerCblk->connected |= 1<<dpy;
+    display_cblk_t* dcblk = mServerCblk->displays + dpy;
+    memset(dcblk, 0, sizeof(display_cblk_t));
+    dcblk->w            = plane.getWidth();
+    dcblk->h            = plane.getHeight();
+    dcblk->format       = f;
+    dcblk->orientation  = ISurfaceComposer::eOrientationDefault;
+    dcblk->xdpi         = hw.getDpiX();
+    dcblk->ydpi         = hw.getDpiY();
+    dcblk->fps          = hw.getRefreshRate();
+    dcblk->density      = hw.getDensity();
+
+    // Initialize OpenGL|ES
+    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+    glPixelStorei(GL_PACK_ALIGNMENT, 4); 
+    glEnableClientState(GL_VERTEX_ARRAY);
+    glEnable(GL_SCISSOR_TEST);
+    glShadeModel(GL_FLAT);
+    glDisable(GL_DITHER);
+    glDisable(GL_CULL_FACE);
+
+    const uint16_t g0 = pack565(0x0F,0x1F,0x0F);
+    const uint16_t g1 = pack565(0x17,0x2f,0x17);
+    const uint16_t textureData[4] = { g0, g1, g1, g0 };
+    glGenTextures(1, &mWormholeTexName);
+    glBindTexture(GL_TEXTURE_2D, mWormholeTexName);
+    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 2, 2, 0,
+            GL_RGB, GL_UNSIGNED_SHORT_5_6_5, textureData);
+
+    glViewport(0, 0, w, h);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glOrthof(0, w, h, 0, 0, 1);
+
+   LayerDim::initDimmer(this, w, h);
+
+    mReadyToRunBarrier.open();
+
+    /*
+     *  We're now ready to accept clients...
+     */
+
+    // start boot animation
+    property_set("ctl.start", "bootanim");
+    
+    return NO_ERROR;
+}
+
+// ----------------------------------------------------------------------------
+#if 0
+#pragma mark -
+#pragma mark Events Handler
+#endif
+
+void SurfaceFlinger::waitForEvent()
+{
+    while (true) {
+        nsecs_t timeout = -1;
+        const nsecs_t freezeDisplayTimeout = ms2ns(5000);
+        if (UNLIKELY(isFrozen())) {
+            // wait 5 seconds
+            const nsecs_t now = systemTime();
+            if (mFreezeDisplayTime == 0) {
+                mFreezeDisplayTime = now;
+            }
+            nsecs_t waitTime = freezeDisplayTimeout - (now - mFreezeDisplayTime);
+            timeout = waitTime>0 ? waitTime : 0;
+        }
+
+        sp<MessageBase> msg = mEventQueue.waitMessage(timeout);
+
+        // see if we timed out
+        if (isFrozen()) {
+            const nsecs_t now = systemTime();
+            nsecs_t frozenTime = (now - mFreezeDisplayTime);
+            if (frozenTime >= freezeDisplayTimeout) {
+                // we timed out and are still frozen
+                LOGW("timeout expired mFreezeDisplay=%d, mFreezeCount=%d",
+                        mFreezeDisplay, mFreezeCount);
+                mFreezeDisplayTime = 0;
+                mFreezeCount = 0;
+                mFreezeDisplay = false;
+            }
+        }
+
+        if (msg != 0) {
+            switch (msg->what) {
+                case MessageQueue::INVALIDATE:
+                    // invalidate message, just return to the main loop
+                    return;
+            }
+        }
+    }
+}
+
+void SurfaceFlinger::signalEvent() {
+    mEventQueue.invalidate();
+}
+
+void SurfaceFlinger::signal() const {
+    // this is the IPC call
+    const_cast<SurfaceFlinger*>(this)->signalEvent();
+}
+
+status_t SurfaceFlinger::postMessageAsync(const sp<MessageBase>& msg,
+        nsecs_t reltime, uint32_t flags)
+{
+    return mEventQueue.postMessage(msg, reltime, flags);
+}
+
+status_t SurfaceFlinger::postMessageSync(const sp<MessageBase>& msg,
+        nsecs_t reltime, uint32_t flags)
+{
+    status_t res = mEventQueue.postMessage(msg, reltime, flags);
+    if (res == NO_ERROR) {
+        msg->wait();
+    }
+    return res;
+}
+
+// ----------------------------------------------------------------------------
+#if 0
+#pragma mark -
+#pragma mark Main loop
+#endif
+
+bool SurfaceFlinger::threadLoop()
+{
+    waitForEvent();
+
+    // check for transactions
+    if (UNLIKELY(mConsoleSignals)) {
+        handleConsoleEvents();
+    }
+
+    if (LIKELY(mTransactionCount == 0)) {
+        // if we're in a global transaction, don't do anything.
+        const uint32_t mask = eTransactionNeeded | eTraversalNeeded;
+        uint32_t transactionFlags = getTransactionFlags(mask);
+        if (LIKELY(transactionFlags)) {
+            handleTransaction(transactionFlags);
+        }
+    }
+
+    // post surfaces (if needed)
+    handlePageFlip();
+
+    const DisplayHardware& hw(graphicPlane(0).displayHardware());
+    if (LIKELY(hw.canDraw() && !isFrozen())) {
+        // repaint the framebuffer (if needed)
+        handleRepaint();
+
+        // inform the h/w that we're done compositing
+        hw.compositionComplete();
+
+        // release the clients before we flip ('cause flip might block)
+        unlockClients();
+
+        postFramebuffer();
+    } else {
+        // pretend we did the post
+        unlockClients();
+        usleep(16667); // 60 fps period
+    }
+    return true;
+}
+
+void SurfaceFlinger::postFramebuffer()
+{
+    if (!mInvalidRegion.isEmpty()) {
+        const DisplayHardware& hw(graphicPlane(0).displayHardware());
+        const nsecs_t now = systemTime();
+        mDebugInSwapBuffers = now;
+        hw.flip(mInvalidRegion);
+        mLastSwapBufferTime = systemTime() - now;
+        mDebugInSwapBuffers = 0;
+        mInvalidRegion.clear();
+    }
+}
+
+void SurfaceFlinger::handleConsoleEvents()
+{
+    // something to do with the console
+    const DisplayHardware& hw = graphicPlane(0).displayHardware();
+
+    int what = android_atomic_and(0, &mConsoleSignals);
+    if (what & eConsoleAcquired) {
+        hw.acquireScreen();
+    }
+
+    if (mDeferReleaseConsole && hw.canDraw()) {
+        // We got the release signal before the acquire signal
+        mDeferReleaseConsole = false;
+        hw.releaseScreen();
+    }
+
+    if (what & eConsoleReleased) {
+        if (hw.canDraw()) {
+            hw.releaseScreen();
+        } else {
+            mDeferReleaseConsole = true;
+        }
+    }
+
+    mDirtyRegion.set(hw.bounds());
+}
+
+void SurfaceFlinger::handleTransaction(uint32_t transactionFlags)
+{
+    Vector< sp<LayerBase> > ditchedLayers;
+
+    { // scope for the lock
+        Mutex::Autolock _l(mStateLock);
+        const nsecs_t now = systemTime();
+        mDebugInTransaction = now;
+        handleTransactionLocked(transactionFlags, ditchedLayers);
+        mLastTransactionTime = systemTime() - now;
+        mDebugInTransaction = 0;
+    }
+
+    // do this without lock held
+    const size_t count = ditchedLayers.size();
+    for (size_t i=0 ; i<count ; i++) {
+        if (ditchedLayers[i] != 0) {
+            //LOGD("ditching layer %p", ditchedLayers[i].get());
+            ditchedLayers[i]->ditch();
+        }
+    }
+}
+
+void SurfaceFlinger::handleTransactionLocked(
+        uint32_t transactionFlags, Vector< sp<LayerBase> >& ditchedLayers)
+{
+    const LayerVector& currentLayers(mCurrentState.layersSortedByZ);
+    const size_t count = currentLayers.size();
+
+    /*
+     * Traversal of the children
+     * (perform the transaction for each of them if needed)
+     */
+
+    const bool layersNeedTransaction = transactionFlags & eTraversalNeeded;
+    if (layersNeedTransaction) {
+        for (size_t i=0 ; i<count ; i++) {
+            const sp<LayerBase>& layer = currentLayers[i];
+            uint32_t trFlags = layer->getTransactionFlags(eTransactionNeeded);
+            if (!trFlags) continue;
+
+            const uint32_t flags = layer->doTransaction(0);
+            if (flags & Layer::eVisibleRegion)
+                mVisibleRegionsDirty = true;
+        }
+    }
+
+    /*
+     * Perform our own transaction if needed
+     */
+
+    if (transactionFlags & eTransactionNeeded) {
+        if (mCurrentState.orientation != mDrawingState.orientation) {
+            // the orientation has changed, recompute all visible regions
+            // and invalidate everything.
+
+            const int dpy = 0;
+            const int orientation = mCurrentState.orientation;
+            const uint32_t type = mCurrentState.orientationType;
+            GraphicPlane& plane(graphicPlane(dpy));
+            plane.setOrientation(orientation);
+
+            // update the shared control block
+            const DisplayHardware& hw(plane.displayHardware());
+            volatile display_cblk_t* dcblk = mServerCblk->displays + dpy;
+            dcblk->orientation = orientation;
+            dcblk->w = plane.getWidth();
+            dcblk->h = plane.getHeight();
+
+            mVisibleRegionsDirty = true;
+            mDirtyRegion.set(hw.bounds());
+        }
+
+        if (mCurrentState.freezeDisplay != mDrawingState.freezeDisplay) {
+            // freezing or unfreezing the display -> trigger animation if needed
+            mFreezeDisplay = mCurrentState.freezeDisplay;
+            if (mFreezeDisplay)
+                 mFreezeDisplayTime = 0;
+        }
+
+        if (currentLayers.size() > mDrawingState.layersSortedByZ.size()) {
+            // layers have been added
+            mVisibleRegionsDirty = true;
+        }
+
+        // some layers might have been removed, so
+        // we need to update the regions they're exposing.
+        if (mLayersRemoved) {
+            mLayersRemoved = false;
+            mVisibleRegionsDirty = true;
+            const LayerVector& previousLayers(mDrawingState.layersSortedByZ);
+            const size_t count = previousLayers.size();
+            for (size_t i=0 ; i<count ; i++) {
+                const sp<LayerBase>& layer(previousLayers[i]);
+                if (currentLayers.indexOf( layer ) < 0) {
+                    // this layer is not visible anymore
+                    ditchedLayers.add(layer);
+                    mDirtyRegionRemovedLayer.orSelf(layer->visibleRegionScreen);
+                }
+            }
+        }
+    }
+
+    commitTransaction();
+}
+
+sp<FreezeLock> SurfaceFlinger::getFreezeLock() const
+{
+    return new FreezeLock(const_cast<SurfaceFlinger *>(this));
+}
+
+void SurfaceFlinger::computeVisibleRegions(
+    LayerVector& currentLayers, Region& dirtyRegion, Region& opaqueRegion)
+{
+    const GraphicPlane& plane(graphicPlane(0));
+    const Transform& planeTransform(plane.transform());
+    const DisplayHardware& hw(plane.displayHardware());
+    const Region screenRegion(hw.bounds());
+
+    Region aboveOpaqueLayers;
+    Region aboveCoveredLayers;
+    Region dirty;
+
+    bool secureFrameBuffer = false;
+
+    size_t i = currentLayers.size();
+    while (i--) {
+        const sp<LayerBase>& layer = currentLayers[i];
+        layer->validateVisibility(planeTransform);
+
+        // start with the whole surface at its current location
+        const Layer::State& s(layer->drawingState());
+
+        /*
+         * opaqueRegion: area of a surface that is fully opaque.
+         */
+        Region opaqueRegion;
+
+        /*
+         * visibleRegion: area of a surface that is visible on screen
+         * and not fully transparent. This is essentially the layer's
+         * footprint minus the opaque regions above it.
+         * Areas covered by a translucent surface are considered visible.
+         */
+        Region visibleRegion;
+
+        /*
+         * coveredRegion: area of a surface that is covered by all
+         * visible regions above it (which includes the translucent areas).
+         */
+        Region coveredRegion;
+
+
+        // handle hidden surfaces by setting the visible region to empty
+        if (LIKELY(!(s.flags & ISurfaceComposer::eLayerHidden) && s.alpha)) {
+            const bool translucent = layer->needsBlending();
+            const Rect bounds(layer->visibleBounds());
+            visibleRegion.set(bounds);
+            visibleRegion.andSelf(screenRegion);
+            if (!visibleRegion.isEmpty()) {
+                // Remove the transparent area from the visible region
+                if (translucent) {
+                    visibleRegion.subtractSelf(layer->transparentRegionScreen);
+                }
+
+                // compute the opaque region
+                const int32_t layerOrientation = layer->getOrientation();
+                if (s.alpha==255 && !translucent &&
+                        ((layerOrientation & Transform::ROT_INVALID) == false)) {
+                    // the opaque region is the layer's footprint
+                    opaqueRegion = visibleRegion;
+                }
+            }
+        }
+
+        // Clip the covered region to the visible region
+        coveredRegion = aboveCoveredLayers.intersect(visibleRegion);
+
+        // Update aboveCoveredLayers for next (lower) layer
+        aboveCoveredLayers.orSelf(visibleRegion);
+
+        // subtract the opaque region covered by the layers above us
+        visibleRegion.subtractSelf(aboveOpaqueLayers);
+
+        // compute this layer's dirty region
+        if (layer->contentDirty) {
+            // we need to invalidate the whole region
+            dirty = visibleRegion;
+            // as well, as the old visible region
+            dirty.orSelf(layer->visibleRegionScreen);
+            layer->contentDirty = false;
+        } else {
+            /* compute the exposed region:
+             *   the exposed region consists of two components:
+             *   1) what's VISIBLE now and was COVERED before
+             *   2) what's EXPOSED now less what was EXPOSED before
+             *
+             * note that (1) is conservative, we start with the whole
+             * visible region but only keep what used to be covered by
+             * something -- which mean it may have been exposed.
+             *
+             * (2) handles areas that were not covered by anything but got
+             * exposed because of a resize.
+             */
+            const Region newExposed = visibleRegion - coveredRegion;
+            const Region oldVisibleRegion = layer->visibleRegionScreen;
+            const Region oldCoveredRegion = layer->coveredRegionScreen;
+            const Region oldExposed = oldVisibleRegion - oldCoveredRegion;
+            dirty = (visibleRegion&oldCoveredRegion) | (newExposed-oldExposed);
+        }
+        dirty.subtractSelf(aboveOpaqueLayers);
+
+        // accumulate to the screen dirty region
+        dirtyRegion.orSelf(dirty);
+
+        // Update aboveOpaqueLayers for next (lower) layer
+        aboveOpaqueLayers.orSelf(opaqueRegion);
+        
+        // Store the visible region is screen space
+        layer->setVisibleRegion(visibleRegion);
+        layer->setCoveredRegion(coveredRegion);
+
+        // If a secure layer is partially visible, lock-down the screen!
+        if (layer->isSecure() && !visibleRegion.isEmpty()) {
+            secureFrameBuffer = true;
+        }
+    }
+
+    // invalidate the areas where a layer was removed
+    dirtyRegion.orSelf(mDirtyRegionRemovedLayer);
+    mDirtyRegionRemovedLayer.clear();
+
+    mSecureFrameBuffer = secureFrameBuffer;
+    opaqueRegion = aboveOpaqueLayers;
+}
+
+
+void SurfaceFlinger::commitTransaction()
+{
+    mDrawingState = mCurrentState;
+    mResizeTransationPending = false;
+    mTransactionCV.broadcast();
+}
+
+void SurfaceFlinger::handlePageFlip()
+{
+    bool visibleRegions = mVisibleRegionsDirty;
+    LayerVector& currentLayers = const_cast<LayerVector&>(
+            mDrawingState.layersSortedByZ);
+    visibleRegions |= lockPageFlip(currentLayers);
+
+        const DisplayHardware& hw = graphicPlane(0).displayHardware();
+        const Region screenRegion(hw.bounds());
+        if (visibleRegions) {
+            Region opaqueRegion;
+            computeVisibleRegions(currentLayers, mDirtyRegion, opaqueRegion);
+            mWormholeRegion = screenRegion.subtract(opaqueRegion);
+            mVisibleRegionsDirty = false;
+        }
+
+    unlockPageFlip(currentLayers);
+    mDirtyRegion.andSelf(screenRegion);
+}
+
+bool SurfaceFlinger::lockPageFlip(const LayerVector& currentLayers)
+{
+    bool recomputeVisibleRegions = false;
+    size_t count = currentLayers.size();
+    sp<LayerBase> const* layers = currentLayers.array();
+    for (size_t i=0 ; i<count ; i++) {
+        const sp<LayerBase>& layer(layers[i]);
+        layer->lockPageFlip(recomputeVisibleRegions);
+    }
+    return recomputeVisibleRegions;
+}
+
+void SurfaceFlinger::unlockPageFlip(const LayerVector& currentLayers)
+{
+    const GraphicPlane& plane(graphicPlane(0));
+    const Transform& planeTransform(plane.transform());
+    size_t count = currentLayers.size();
+    sp<LayerBase> const* layers = currentLayers.array();
+    for (size_t i=0 ; i<count ; i++) {
+        const sp<LayerBase>& layer(layers[i]);
+        layer->unlockPageFlip(planeTransform, mDirtyRegion);
+    }
+}
+
+
+void SurfaceFlinger::handleRepaint()
+{
+    // compute the invalid region
+    mInvalidRegion.orSelf(mDirtyRegion);
+    if (mInvalidRegion.isEmpty()) {
+        // nothing to do
+        return;
+    }
+
+    if (UNLIKELY(mDebugRegion)) {
+        debugFlashRegions();
+    }
+
+    // set the frame buffer
+    const DisplayHardware& hw(graphicPlane(0).displayHardware());
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+
+    uint32_t flags = hw.getFlags();
+    if ((flags & DisplayHardware::SWAP_RECTANGLE) || 
+        (flags & DisplayHardware::BUFFER_PRESERVED)) 
+    {
+        // we can redraw only what's dirty, but since SWAP_RECTANGLE only
+        // takes a rectangle, we must make sure to update that whole
+        // rectangle in that case
+        if (flags & DisplayHardware::SWAP_RECTANGLE) {
+            // TODO: we really should be able to pass a region to
+            // SWAP_RECTANGLE so that we don't have to redraw all this.
+            mDirtyRegion.set(mInvalidRegion.bounds());
+        } else {
+            // in the BUFFER_PRESERVED case, obviously, we can update only
+            // what's needed and nothing more.
+            // NOTE: this is NOT a common case, as preserving the backbuffer
+            // is costly and usually involves copying the whole update back.
+        }
+    } else {
+        if (flags & DisplayHardware::PARTIAL_UPDATES) {
+            // We need to redraw the rectangle that will be updated
+            // (pushed to the framebuffer).
+            // This is needed because PARTIAL_UPDATES only takes one
+            // rectangle instead of a region (see DisplayHardware::flip())
+            mDirtyRegion.set(mInvalidRegion.bounds());
+        } else {
+            // we need to redraw everything (the whole screen)
+            mDirtyRegion.set(hw.bounds());
+            mInvalidRegion = mDirtyRegion;
+        }
+    }
+
+    // compose all surfaces
+    composeSurfaces(mDirtyRegion);
+
+    // clear the dirty regions
+    mDirtyRegion.clear();
+}
+
+void SurfaceFlinger::composeSurfaces(const Region& dirty)
+{
+    if (UNLIKELY(!mWormholeRegion.isEmpty())) {
+        // should never happen unless the window manager has a bug
+        // draw something...
+        drawWormhole();
+    }
+    const SurfaceFlinger& flinger(*this);
+    const LayerVector& drawingLayers(mDrawingState.layersSortedByZ);
+    const size_t count = drawingLayers.size();
+    sp<LayerBase> const* const layers = drawingLayers.array();
+    for (size_t i=0 ; i<count ; ++i) {
+        const sp<LayerBase>& layer = layers[i];
+        const Region& visibleRegion(layer->visibleRegionScreen);
+        if (!visibleRegion.isEmpty())  {
+            const Region clip(dirty.intersect(visibleRegion));
+            if (!clip.isEmpty()) {
+                layer->draw(clip);
+            }
+        }
+    }
+}
+
+void SurfaceFlinger::unlockClients()
+{
+    const LayerVector& drawingLayers(mDrawingState.layersSortedByZ);
+    const size_t count = drawingLayers.size();
+    sp<LayerBase> const* const layers = drawingLayers.array();
+    for (size_t i=0 ; i<count ; ++i) {
+        const sp<LayerBase>& layer = layers[i];
+        layer->finishPageFlip();
+    }
+}
+
+void SurfaceFlinger::debugFlashRegions()
+{
+    const DisplayHardware& hw(graphicPlane(0).displayHardware());
+    const uint32_t flags = hw.getFlags();
+
+    if (!((flags & DisplayHardware::SWAP_RECTANGLE) ||
+            (flags & DisplayHardware::BUFFER_PRESERVED))) {
+        const Region repaint((flags & DisplayHardware::PARTIAL_UPDATES) ?
+                mDirtyRegion.bounds() : hw.bounds());
+        composeSurfaces(repaint);
+    }
+
+    TextureManager::deactivateTextures();
+
+    glDisable(GL_BLEND);
+    glDisable(GL_DITHER);
+    glDisable(GL_SCISSOR_TEST);
+
+    static int toggle = 0;
+    toggle = 1 - toggle;
+    if (toggle) {
+        glColor4f(1, 0, 1, 1);
+    } else {
+        glColor4f(1, 1, 0, 1);
+    }
+
+    Region::const_iterator it = mDirtyRegion.begin();
+    Region::const_iterator const end = mDirtyRegion.end();
+    while (it != end) {
+        const Rect& r = *it++;
+        GLfloat vertices[][2] = {
+                { r.left,  r.top },
+                { r.left,  r.bottom },
+                { r.right, r.bottom },
+                { r.right, r.top }
+        };
+        glVertexPointer(2, GL_FLOAT, 0, vertices);
+        glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+    }
+
+    if (mInvalidRegion.isEmpty()) {
+        mDirtyRegion.dump("mDirtyRegion");
+        mInvalidRegion.dump("mInvalidRegion");
+    }
+    hw.flip(mInvalidRegion);
+
+    if (mDebugRegion > 1)
+        usleep(mDebugRegion * 1000);
+
+    glEnable(GL_SCISSOR_TEST);
+    //mDirtyRegion.dump("mDirtyRegion");
+}
+
+void SurfaceFlinger::drawWormhole() const
+{
+    const Region region(mWormholeRegion.intersect(mDirtyRegion));
+    if (region.isEmpty())
+        return;
+
+    const DisplayHardware& hw(graphicPlane(0).displayHardware());
+    const int32_t width = hw.getWidth();
+    const int32_t height = hw.getHeight();
+
+    glDisable(GL_BLEND);
+    glDisable(GL_DITHER);
+
+    if (LIKELY(!mDebugBackground)) {
+        glClearColor(0,0,0,0);
+        Region::const_iterator it = region.begin();
+        Region::const_iterator const end = region.end();
+        while (it != end) {
+            const Rect& r = *it++;
+            const GLint sy = height - (r.top + r.height());
+            glScissor(r.left, sy, r.width(), r.height());
+            glClear(GL_COLOR_BUFFER_BIT);
+        }
+    } else {
+        const GLshort vertices[][2] = { { 0, 0 }, { width, 0 },
+                { width, height }, { 0, height }  };
+        const GLshort tcoords[][2] = { { 0, 0 }, { 1, 0 },  { 1, 1 }, { 0, 1 } };
+        glVertexPointer(2, GL_SHORT, 0, vertices);
+        glTexCoordPointer(2, GL_SHORT, 0, tcoords);
+        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+#if defined(GL_OES_texture_external)
+        if (GLExtensions::getInstance().haveTextureExternal()) {
+            glDisable(GL_TEXTURE_EXTERNAL_OES);
+        }
+#endif
+        glEnable(GL_TEXTURE_2D);
+        glBindTexture(GL_TEXTURE_2D, mWormholeTexName);
+        glTexEnvx(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+        glMatrixMode(GL_TEXTURE);
+        glLoadIdentity();
+        glScalef(width*(1.0f/32.0f), height*(1.0f/32.0f), 1);
+        Region::const_iterator it = region.begin();
+        Region::const_iterator const end = region.end();
+        while (it != end) {
+            const Rect& r = *it++;
+            const GLint sy = height - (r.top + r.height());
+            glScissor(r.left, sy, r.width(), r.height());
+            glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+        }
+        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+    }
+}
+
+void SurfaceFlinger::debugShowFPS() const
+{
+    static int mFrameCount;
+    static int mLastFrameCount = 0;
+    static nsecs_t mLastFpsTime = 0;
+    static float mFps = 0;
+    mFrameCount++;
+    nsecs_t now = systemTime();
+    nsecs_t diff = now - mLastFpsTime;
+    if (diff > ms2ns(250)) {
+        mFps =  ((mFrameCount - mLastFrameCount) * float(s2ns(1))) / diff;
+        mLastFpsTime = now;
+        mLastFrameCount = mFrameCount;
+    }
+    // XXX: mFPS has the value we want
+ }
+
+status_t SurfaceFlinger::addLayer(const sp<LayerBase>& layer)
+{
+    Mutex::Autolock _l(mStateLock);
+    addLayer_l(layer);
+    setTransactionFlags(eTransactionNeeded|eTraversalNeeded);
+    return NO_ERROR;
+}
+
+status_t SurfaceFlinger::addLayer_l(const sp<LayerBase>& layer)
+{
+    ssize_t i = mCurrentState.layersSortedByZ.add(
+                layer, &LayerBase::compareCurrentStateZ);
+    return (i < 0) ? status_t(i) : status_t(NO_ERROR);
+}
+
+ssize_t SurfaceFlinger::addClientLayer(const sp<Client>& client,
+        const sp<LayerBaseClient>& lbc)
+{
+    Mutex::Autolock _l(mStateLock);
+
+    // attach this layer to the client
+    ssize_t name = client->attachLayer(lbc);
+
+    // add this layer to the current state list
+    addLayer_l(lbc);
+
+    return name;
+}
+
+status_t SurfaceFlinger::removeLayer(const sp<LayerBase>& layer)
+{
+    Mutex::Autolock _l(mStateLock);
+    status_t err = purgatorizeLayer_l(layer);
+    if (err == NO_ERROR)
+        setTransactionFlags(eTransactionNeeded);
+    return err;
+}
+
+status_t SurfaceFlinger::removeLayer_l(const sp<LayerBase>& layerBase)
+{
+    sp<LayerBaseClient> lbc(layerBase->getLayerBaseClient());
+    if (lbc != 0) {
+        mLayerMap.removeItem( lbc->getSurface()->asBinder() );
+    }
+    ssize_t index = mCurrentState.layersSortedByZ.remove(layerBase);
+    if (index >= 0) {
+        mLayersRemoved = true;
+        return NO_ERROR;
+    }
+    return status_t(index);
+}
+
+status_t SurfaceFlinger::purgatorizeLayer_l(const sp<LayerBase>& layerBase)
+{
+    // remove the layer from the main list (through a transaction).
+    ssize_t err = removeLayer_l(layerBase);
+
+    layerBase->onRemoved();
+
+    // it's possible that we don't find a layer, because it might
+    // have been destroyed already -- this is not technically an error
+    // from the user because there is a race between Client::destroySurface(),
+    // ~Client() and ~ISurface().
+    return (err == NAME_NOT_FOUND) ? status_t(NO_ERROR) : err;
+}
+
+status_t SurfaceFlinger::invalidateLayerVisibility(const sp<LayerBase>& layer)
+{
+    layer->forceVisibilityTransaction();
+    setTransactionFlags(eTraversalNeeded);
+    return NO_ERROR;
+}
+
+uint32_t SurfaceFlinger::getTransactionFlags(uint32_t flags)
+{
+    return android_atomic_and(~flags, &mTransactionFlags) & flags;
+}
+
+uint32_t SurfaceFlinger::setTransactionFlags(uint32_t flags)
+{
+    uint32_t old = android_atomic_or(flags, &mTransactionFlags);
+    if ((old & flags)==0) { // wake the server up
+        signalEvent();
+    }
+    return old;
+}
+
+void SurfaceFlinger::openGlobalTransaction()
+{
+    android_atomic_inc(&mTransactionCount);
+}
+
+void SurfaceFlinger::closeGlobalTransaction()
+{
+    if (android_atomic_dec(&mTransactionCount) == 1) {
+        signalEvent();
+
+        // if there is a transaction with a resize, wait for it to 
+        // take effect before returning.
+        Mutex::Autolock _l(mStateLock);
+        while (mResizeTransationPending) {
+            status_t err = mTransactionCV.waitRelative(mStateLock, s2ns(5));
+            if (CC_UNLIKELY(err != NO_ERROR)) {
+                // just in case something goes wrong in SF, return to the
+                // called after a few seconds.
+                LOGW_IF(err == TIMED_OUT, "closeGlobalTransaction timed out!");
+                mResizeTransationPending = false;
+                break;
+            }
+        }
+    }
+}
+
+status_t SurfaceFlinger::freezeDisplay(DisplayID dpy, uint32_t flags)
+{
+    if (UNLIKELY(uint32_t(dpy) >= DISPLAY_COUNT))
+        return BAD_VALUE;
+
+    Mutex::Autolock _l(mStateLock);
+    mCurrentState.freezeDisplay = 1;
+    setTransactionFlags(eTransactionNeeded);
+
+    // flags is intended to communicate some sort of animation behavior
+    // (for instance fading)
+    return NO_ERROR;
+}
+
+status_t SurfaceFlinger::unfreezeDisplay(DisplayID dpy, uint32_t flags)
+{
+    if (UNLIKELY(uint32_t(dpy) >= DISPLAY_COUNT))
+        return BAD_VALUE;
+
+    Mutex::Autolock _l(mStateLock);
+    mCurrentState.freezeDisplay = 0;
+    setTransactionFlags(eTransactionNeeded);
+
+    // flags is intended to communicate some sort of animation behavior
+    // (for instance fading)
+    return NO_ERROR;
+}
+
+int SurfaceFlinger::setOrientation(DisplayID dpy, 
+        int orientation, uint32_t flags)
+{
+    if (UNLIKELY(uint32_t(dpy) >= DISPLAY_COUNT))
+        return BAD_VALUE;
+
+    Mutex::Autolock _l(mStateLock);
+    if (mCurrentState.orientation != orientation) {
+        if (uint32_t(orientation)<=eOrientation270 || orientation==42) {
+            mCurrentState.orientationType = flags;
+            mCurrentState.orientation = orientation;
+            setTransactionFlags(eTransactionNeeded);
+            mTransactionCV.wait(mStateLock);
+        } else {
+            orientation = BAD_VALUE;
+        }
+    }
+    return orientation;
+}
+
+sp<ISurface> SurfaceFlinger::createSurface(const sp<Client>& client, int pid,
+        const String8& name, ISurfaceComposerClient::surface_data_t* params,
+        DisplayID d, uint32_t w, uint32_t h, PixelFormat format,
+        uint32_t flags)
+{
+    sp<LayerBaseClient> layer;
+    sp<LayerBaseClient::Surface> surfaceHandle;
+
+    if (int32_t(w|h) < 0) {
+        LOGE("createSurface() failed, w or h is negative (w=%d, h=%d)",
+                int(w), int(h));
+        return surfaceHandle;
+    }
+    
+    //LOGD("createSurface for pid %d (%d x %d)", pid, w, h);
+    sp<Layer> normalLayer;
+    switch (flags & eFXSurfaceMask) {
+        case eFXSurfaceNormal:
+            if (UNLIKELY(flags & ePushBuffers)) {
+                layer = createPushBuffersSurface(client, d, w, h, flags);
+            } else {
+                normalLayer = createNormalSurface(client, d, w, h, flags, format);
+                layer = normalLayer;
+            }
+            break;
+        case eFXSurfaceBlur:
+            layer = createBlurSurface(client, d, w, h, flags);
+            break;
+        case eFXSurfaceDim:
+            layer = createDimSurface(client, d, w, h, flags);
+            break;
+    }
+
+    if (layer != 0) {
+        layer->initStates(w, h, flags);
+        layer->setName(name);
+        ssize_t token = addClientLayer(client, layer);
+
+        surfaceHandle = layer->getSurface();
+        if (surfaceHandle != 0) { 
+            params->token = token;
+            params->identity = surfaceHandle->getIdentity();
+            params->width = w;
+            params->height = h;
+            params->format = format;
+            if (normalLayer != 0) {
+                Mutex::Autolock _l(mStateLock);
+                mLayerMap.add(surfaceHandle->asBinder(), normalLayer);
+            }
+        }
+
+        setTransactionFlags(eTransactionNeeded);
+    }
+
+    return surfaceHandle;
+}
+
+sp<Layer> SurfaceFlinger::createNormalSurface(
+        const sp<Client>& client, DisplayID display,
+        uint32_t w, uint32_t h, uint32_t flags,
+        PixelFormat& format)
+{
+    // initialize the surfaces
+    switch (format) { // TODO: take h/w into account
+    case PIXEL_FORMAT_TRANSPARENT:
+    case PIXEL_FORMAT_TRANSLUCENT:
+        format = PIXEL_FORMAT_RGBA_8888;
+        break;
+    case PIXEL_FORMAT_OPAQUE:
+#ifdef NO_RGBX_8888
+        format = PIXEL_FORMAT_RGB_565;
+#else
+        format = PIXEL_FORMAT_RGBX_8888;
+#endif
+        break;
+    }
+
+#ifdef NO_RGBX_8888
+    if (format == PIXEL_FORMAT_RGBX_8888)
+        format = PIXEL_FORMAT_RGBA_8888;
+#endif
+
+    sp<Layer> layer = new Layer(this, display, client);
+    status_t err = layer->setBuffers(w, h, format, flags);
+    if (LIKELY(err != NO_ERROR)) {
+        LOGE("createNormalSurfaceLocked() failed (%s)", strerror(-err));
+        layer.clear();
+    }
+    return layer;
+}
+
+sp<LayerBlur> SurfaceFlinger::createBlurSurface(
+        const sp<Client>& client, DisplayID display,
+        uint32_t w, uint32_t h, uint32_t flags)
+{
+    sp<LayerBlur> layer = new LayerBlur(this, display, client);
+    layer->initStates(w, h, flags);
+    return layer;
+}
+
+sp<LayerDim> SurfaceFlinger::createDimSurface(
+        const sp<Client>& client, DisplayID display,
+        uint32_t w, uint32_t h, uint32_t flags)
+{
+    sp<LayerDim> layer = new LayerDim(this, display, client);
+    layer->initStates(w, h, flags);
+    return layer;
+}
+
+sp<LayerBuffer> SurfaceFlinger::createPushBuffersSurface(
+        const sp<Client>& client, DisplayID display,
+        uint32_t w, uint32_t h, uint32_t flags)
+{
+    sp<LayerBuffer> layer = new LayerBuffer(this, display, client);
+    layer->initStates(w, h, flags);
+    return layer;
+}
+
+status_t SurfaceFlinger::removeSurface(const sp<Client>& client, SurfaceID sid)
+{
+    /*
+     * called by the window manager, when a surface should be marked for
+     * destruction.
+     * 
+     * The surface is removed from the current and drawing lists, but placed
+     * in the purgatory queue, so it's not destroyed right-away (we need
+     * to wait for all client's references to go away first).
+     */
+
+    status_t err = NAME_NOT_FOUND;
+    Mutex::Autolock _l(mStateLock);
+    sp<LayerBaseClient> layer = client->getLayerUser(sid);
+    if (layer != 0) {
+        err = purgatorizeLayer_l(layer);
+        if (err == NO_ERROR) {
+            setTransactionFlags(eTransactionNeeded);
+        }
+    }
+    return err;
+}
+
+status_t SurfaceFlinger::destroySurface(const sp<LayerBaseClient>& layer)
+{
+    // called by ~ISurface() when all references are gone
+    
+    class MessageDestroySurface : public MessageBase {
+        SurfaceFlinger* flinger;
+        sp<LayerBaseClient> layer;
+    public:
+        MessageDestroySurface(
+                SurfaceFlinger* flinger, const sp<LayerBaseClient>& layer)
+            : flinger(flinger), layer(layer) { }
+        virtual bool handler() {
+            sp<LayerBaseClient> l(layer);
+            layer.clear(); // clear it outside of the lock;
+            Mutex::Autolock _l(flinger->mStateLock);
+            /*
+             * remove the layer from the current list -- chances are that it's 
+             * not in the list anyway, because it should have been removed 
+             * already upon request of the client (eg: window manager). 
+             * However, a buggy client could have not done that.
+             * Since we know we don't have any more clients, we don't need
+             * to use the purgatory.
+             */
+            status_t err = flinger->removeLayer_l(l);
+            LOGE_IF(err<0 && err != NAME_NOT_FOUND,
+                    "error removing layer=%p (%s)", l.get(), strerror(-err));
+            return true;
+        }
+    };
+
+    postMessageAsync( new MessageDestroySurface(this, layer) );
+    return NO_ERROR;
+}
+
+status_t SurfaceFlinger::setClientState(
+        const sp<Client>& client,
+        int32_t count,
+        const layer_state_t* states)
+{
+    Mutex::Autolock _l(mStateLock);
+    uint32_t flags = 0;
+    for (int i=0 ; i<count ; i++) {
+        const layer_state_t& s(states[i]);
+        sp<LayerBaseClient> layer(client->getLayerUser(s.surface));
+        if (layer != 0) {
+            const uint32_t what = s.what;
+            if (what & ePositionChanged) {
+                if (layer->setPosition(s.x, s.y))
+                    flags |= eTraversalNeeded;
+            }
+            if (what & eLayerChanged) {
+                if (layer->setLayer(s.z)) {
+                    mCurrentState.layersSortedByZ.reorder(
+                            layer, &Layer::compareCurrentStateZ);
+                    // we need traversal (state changed)
+                    // AND transaction (list changed)
+                    flags |= eTransactionNeeded|eTraversalNeeded;
+                }
+            }
+            if (what & eSizeChanged) {
+                if (layer->setSize(s.w, s.h)) {
+                    flags |= eTraversalNeeded;
+                    mResizeTransationPending = true;
+                }
+            }
+            if (what & eAlphaChanged) {
+                if (layer->setAlpha(uint8_t(255.0f*s.alpha+0.5f)))
+                    flags |= eTraversalNeeded;
+            }
+            if (what & eMatrixChanged) {
+                if (layer->setMatrix(s.matrix))
+                    flags |= eTraversalNeeded;
+            }
+            if (what & eTransparentRegionChanged) {
+                if (layer->setTransparentRegionHint(s.transparentRegion))
+                    flags |= eTraversalNeeded;
+            }
+            if (what & eVisibilityChanged) {
+                if (layer->setFlags(s.flags, s.mask))
+                    flags |= eTraversalNeeded;
+            }
+        }
+    }
+    if (flags) {
+        setTransactionFlags(flags);
+    }
+    return NO_ERROR;
+}
+
+void SurfaceFlinger::screenReleased(int dpy)
+{
+    // this may be called by a signal handler, we can't do too much in here
+    android_atomic_or(eConsoleReleased, &mConsoleSignals);
+    signalEvent();
+}
+
+void SurfaceFlinger::screenAcquired(int dpy)
+{
+    // this may be called by a signal handler, we can't do too much in here
+    android_atomic_or(eConsoleAcquired, &mConsoleSignals);
+    signalEvent();
+}
+
+status_t SurfaceFlinger::dump(int fd, const Vector<String16>& args)
+{
+    const size_t SIZE = 1024;
+    char buffer[SIZE];
+    String8 result;
+    if (!mDump.checkCalling()) {
+        snprintf(buffer, SIZE, "Permission Denial: "
+                "can't dump SurfaceFlinger from pid=%d, uid=%d\n",
+                IPCThreadState::self()->getCallingPid(),
+                IPCThreadState::self()->getCallingUid());
+        result.append(buffer);
+    } else {
+
+        // figure out if we're stuck somewhere
+        const nsecs_t now = systemTime();
+        const nsecs_t inSwapBuffers(mDebugInSwapBuffers);
+        const nsecs_t inTransaction(mDebugInTransaction);
+        nsecs_t inSwapBuffersDuration = (inSwapBuffers) ? now-inSwapBuffers : 0;
+        nsecs_t inTransactionDuration = (inTransaction) ? now-inTransaction : 0;
+
+        // Try to get the main lock, but don't insist if we can't
+        // (this would indicate SF is stuck, but we want to be able to
+        // print something in dumpsys).
+        int retry = 3;
+        while (mStateLock.tryLock()<0 && --retry>=0) {
+            usleep(1000000);
+        }
+        const bool locked(retry >= 0);
+        if (!locked) {
+            snprintf(buffer, SIZE, 
+                    "SurfaceFlinger appears to be unresponsive, "
+                    "dumping anyways (no locks held)\n");
+            result.append(buffer);
+        }
+
+        const LayerVector& currentLayers = mCurrentState.layersSortedByZ;
+        const size_t count = currentLayers.size();
+        for (size_t i=0 ; i<count ; i++) {
+            const sp<LayerBase>& layer(currentLayers[i]);
+            layer->dump(result, buffer, SIZE);
+            const Layer::State& s(layer->drawingState());
+            s.transparentRegion.dump(result, "transparentRegion");
+            layer->transparentRegionScreen.dump(result, "transparentRegionScreen");
+            layer->visibleRegionScreen.dump(result, "visibleRegionScreen");
+        }
+
+        mWormholeRegion.dump(result, "WormholeRegion");
+        const DisplayHardware& hw(graphicPlane(0).displayHardware());
+        snprintf(buffer, SIZE,
+                "  display frozen: %s, freezeCount=%d, orientation=%d, canDraw=%d\n",
+                mFreezeDisplay?"yes":"no", mFreezeCount,
+                mCurrentState.orientation, hw.canDraw());
+        result.append(buffer);
+        snprintf(buffer, SIZE,
+                "  last eglSwapBuffers() time: %f us\n"
+                "  last transaction time     : %f us\n",
+                mLastSwapBufferTime/1000.0, mLastTransactionTime/1000.0);
+        result.append(buffer);
+
+        if (inSwapBuffersDuration || !locked) {
+            snprintf(buffer, SIZE, "  eglSwapBuffers time: %f us\n",
+                    inSwapBuffersDuration/1000.0);
+            result.append(buffer);
+        }
+
+        if (inTransactionDuration || !locked) {
+            snprintf(buffer, SIZE, "  transaction time: %f us\n",
+                    inTransactionDuration/1000.0);
+            result.append(buffer);
+        }
+
+        const GraphicBufferAllocator& alloc(GraphicBufferAllocator::get());
+        alloc.dump(result);
+
+        if (locked) {
+            mStateLock.unlock();
+        }
+    }
+    write(fd, result.string(), result.size());
+    return NO_ERROR;
+}
+
+status_t SurfaceFlinger::onTransact(
+    uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
+{
+    switch (code) {
+        case CREATE_CONNECTION:
+        case OPEN_GLOBAL_TRANSACTION:
+        case CLOSE_GLOBAL_TRANSACTION:
+        case SET_ORIENTATION:
+        case FREEZE_DISPLAY:
+        case UNFREEZE_DISPLAY:
+        case BOOT_FINISHED:
+        {
+            // codes that require permission check
+            IPCThreadState* ipc = IPCThreadState::self();
+            const int pid = ipc->getCallingPid();
+            const int uid = ipc->getCallingUid();
+            if ((uid != AID_GRAPHICS) && !mAccessSurfaceFlinger.check(pid, uid)) {
+                LOGE("Permission Denial: "
+                        "can't access SurfaceFlinger pid=%d, uid=%d", pid, uid);
+                return PERMISSION_DENIED;
+            }
+        }
+    }
+    status_t err = BnSurfaceComposer::onTransact(code, data, reply, flags);
+    if (err == UNKNOWN_TRANSACTION || err == PERMISSION_DENIED) {
+        CHECK_INTERFACE(ISurfaceComposer, data, reply);
+        if (UNLIKELY(!mHardwareTest.checkCalling())) {
+            IPCThreadState* ipc = IPCThreadState::self();
+            const int pid = ipc->getCallingPid();
+            const int uid = ipc->getCallingUid();
+            LOGE("Permission Denial: "
+                    "can't access SurfaceFlinger pid=%d, uid=%d", pid, uid);
+            return PERMISSION_DENIED;
+        }
+        int n;
+        switch (code) {
+            case 1000: // SHOW_CPU, NOT SUPPORTED ANYMORE
+                return NO_ERROR;
+            case 1001:  // SHOW_FPS, NOT SUPPORTED ANYMORE
+                return NO_ERROR;
+            case 1002:  // SHOW_UPDATES
+                n = data.readInt32();
+                mDebugRegion = n ? n : (mDebugRegion ? 0 : 1);
+                return NO_ERROR;
+            case 1003:  // SHOW_BACKGROUND
+                n = data.readInt32();
+                mDebugBackground = n ? 1 : 0;
+                return NO_ERROR;
+            case 1004:{ // repaint everything
+                Mutex::Autolock _l(mStateLock);
+                const DisplayHardware& hw(graphicPlane(0).displayHardware());
+                mDirtyRegion.set(hw.bounds()); // careful that's not thread-safe
+                signalEvent();
+                return NO_ERROR;
+            }
+            case 1005:{ // force transaction
+                setTransactionFlags(eTransactionNeeded|eTraversalNeeded);
+                return NO_ERROR;
+            }
+            case 1007: // set mFreezeCount
+                mFreezeCount = data.readInt32();
+                mFreezeDisplayTime = 0;
+                return NO_ERROR;
+            case 1010:  // interrogate.
+                reply->writeInt32(0);
+                reply->writeInt32(0);
+                reply->writeInt32(mDebugRegion);
+                reply->writeInt32(mDebugBackground);
+                return NO_ERROR;
+            case 1013: {
+                Mutex::Autolock _l(mStateLock);
+                const DisplayHardware& hw(graphicPlane(0).displayHardware());
+                reply->writeInt32(hw.getPageFlipCount());
+            }
+            return NO_ERROR;
+        }
+    }
+    return err;
+}
+
+// ---------------------------------------------------------------------------
+
+sp<Layer> SurfaceFlinger::getLayer(const sp<ISurface>& sur) const
+{
+    sp<Layer> result;
+    Mutex::Autolock _l(mStateLock);
+    result = mLayerMap.valueFor( sur->asBinder() ).promote();
+    return result;
+}
+
+// ---------------------------------------------------------------------------
+
+Client::Client(const sp<SurfaceFlinger>& flinger)
+    : mFlinger(flinger), mNameGenerator(1)
+{
+}
+
+Client::~Client()
+{
+    const size_t count = mLayers.size();
+    for (size_t i=0 ; i<count ; i++) {
+        sp<LayerBaseClient> layer(mLayers.valueAt(i).promote());
+        if (layer != 0) {
+            mFlinger->removeLayer(layer);
+        }
+    }
+}
+
+status_t Client::initCheck() const {
+    return NO_ERROR;
+}
+
+ssize_t Client::attachLayer(const sp<LayerBaseClient>& layer)
+{
+    int32_t name = android_atomic_inc(&mNameGenerator);
+    mLayers.add(name, layer);
+    return name;
+}
+
+void Client::detachLayer(const LayerBaseClient* layer)
+{
+    // we do a linear search here, because this doesn't happen often
+    const size_t count = mLayers.size();
+    for (size_t i=0 ; i<count ; i++) {
+        if (mLayers.valueAt(i) == layer) {
+            mLayers.removeItemsAt(i, 1);
+            break;
+        }
+    }
+}
+sp<LayerBaseClient> Client::getLayerUser(int32_t i) const {
+    sp<LayerBaseClient> lbc;
+    const wp<LayerBaseClient>& layer(mLayers.valueFor(i));
+    if (layer != 0) {
+        lbc = layer.promote();
+        LOGE_IF(lbc==0, "getLayerUser(name=%d) is dead", int(i));
+    }
+    return lbc;
+}
+
+sp<IMemoryHeap> Client::getControlBlock() const {
+    return 0;
+}
+ssize_t Client::getTokenForSurface(const sp<ISurface>& sur) const {
+    return -1;
+}
+sp<ISurface> Client::createSurface(
+        ISurfaceComposerClient::surface_data_t* params, int pid,
+        const String8& name,
+        DisplayID display, uint32_t w, uint32_t h, PixelFormat format,
+        uint32_t flags)
+{
+    return mFlinger->createSurface(this, pid, name, params,
+            display, w, h, format, flags);
+}
+status_t Client::destroySurface(SurfaceID sid) {
+    return mFlinger->removeSurface(this, sid);
+}
+status_t Client::setState(int32_t count, const layer_state_t* states) {
+    return mFlinger->setClientState(this, count, states);
+}
+
+// ---------------------------------------------------------------------------
+
+UserClient::UserClient(const sp<SurfaceFlinger>& flinger)
+    : ctrlblk(0), mBitmap(0), mFlinger(flinger)
+{
+    const int pgsize = getpagesize();
+    const int cblksize = ((sizeof(SharedClient)+(pgsize-1))&~(pgsize-1));
+
+    mCblkHeap = new MemoryHeapBase(cblksize, 0,
+            "SurfaceFlinger Client control-block");
+
+    ctrlblk = static_cast<SharedClient *>(mCblkHeap->getBase());
+    if (ctrlblk) { // construct the shared structure in-place.
+        new(ctrlblk) SharedClient;
+    }
+}
+
+UserClient::~UserClient()
+{
+    if (ctrlblk) {
+        ctrlblk->~SharedClient();  // destroy our shared-structure.
+    }
+
+    /*
+     * When a UserClient dies, it's unclear what to do exactly.
+     * We could go ahead and destroy all surfaces linked to that client
+     * however, it wouldn't be fair to the main Client
+     * (usually the the window-manager), which might want to re-target
+     * the layer to another UserClient.
+     * I think the best is to do nothing, or not much; in most cases the
+     * WM itself will go ahead and clean things up when it detects a client of
+     * his has died.
+     * The remaining question is what to display? currently we keep
+     * just keep the current buffer.
+     */
+}
+
+status_t UserClient::initCheck() const {
+    return ctrlblk == 0 ? NO_INIT : NO_ERROR;
+}
+
+void UserClient::detachLayer(const Layer* layer)
+{
+    int32_t name = layer->getToken();
+    if (name >= 0) {
+        int32_t mask = 1LU<<name;
+        if ((android_atomic_and(~mask, &mBitmap) & mask) == 0) {
+            LOGW("token %d wasn't marked as used %08x", name, int(mBitmap));
+        }
+    }
+}
+
+sp<IMemoryHeap> UserClient::getControlBlock() const {
+    return mCblkHeap;
+}
+
+ssize_t UserClient::getTokenForSurface(const sp<ISurface>& sur) const
+{
+    int32_t name = NAME_NOT_FOUND;
+    sp<Layer> layer(mFlinger->getLayer(sur));
+    if (layer == 0) return name;
+
+    // if this layer already has a token, just return it
+    name = layer->getToken();
+    if ((name >= 0) && (layer->getClient() == this))
+        return name;
+
+    name = 0;
+    do {
+        int32_t mask = 1LU<<name;
+        if ((android_atomic_or(mask, &mBitmap) & mask) == 0) {
+            // we found and locked that name
+            status_t err = layer->setToken(
+                    const_cast<UserClient*>(this), ctrlblk, name);
+            if (err != NO_ERROR) {
+                // free the name
+                android_atomic_and(~mask, &mBitmap);
+                name = err;
+            }
+            break;
+        }
+        if (++name > 31)
+            name = NO_MEMORY;
+    } while(name >= 0);
+
+    //LOGD("getTokenForSurface(%p) => %d (client=%p, bitmap=%08lx)",
+    //        sur->asBinder().get(), name, this, mBitmap);
+    return name;
+}
+
+sp<ISurface> UserClient::createSurface(
+        ISurfaceComposerClient::surface_data_t* params, int pid,
+        const String8& name,
+        DisplayID display, uint32_t w, uint32_t h, PixelFormat format,
+        uint32_t flags) {
+    return 0;
+}
+status_t UserClient::destroySurface(SurfaceID sid) {
+    return INVALID_OPERATION;
+}
+status_t UserClient::setState(int32_t count, const layer_state_t* states) {
+    return INVALID_OPERATION;
+}
+
+// ---------------------------------------------------------------------------
+
+GraphicPlane::GraphicPlane()
+    : mHw(0)
+{
+}
+
+GraphicPlane::~GraphicPlane() {
+    delete mHw;
+}
+
+bool GraphicPlane::initialized() const {
+    return mHw ? true : false;
+}
+
+int GraphicPlane::getWidth() const {
+    return mWidth;
+}
+
+int GraphicPlane::getHeight() const {
+    return mHeight;
+}
+
+void GraphicPlane::setDisplayHardware(DisplayHardware *hw)
+{
+    mHw = hw;
+
+    // initialize the display orientation transform.
+    // it's a constant that should come from the display driver.
+    int displayOrientation = ISurfaceComposer::eOrientationDefault;
+    char property[PROPERTY_VALUE_MAX];
+    if (property_get("ro.sf.hwrotation", property, NULL) > 0) {
+        //displayOrientation
+        switch (atoi(property)) {
+        case 90:
+            displayOrientation = ISurfaceComposer::eOrientation90;
+            break;
+        case 270:
+            displayOrientation = ISurfaceComposer::eOrientation270;
+            break;
+        }
+    }
+
+    const float w = hw->getWidth();
+    const float h = hw->getHeight();
+    GraphicPlane::orientationToTransfrom(displayOrientation, w, h,
+            &mDisplayTransform);
+    if (displayOrientation & ISurfaceComposer::eOrientationSwapMask) {
+        mDisplayWidth = h;
+        mDisplayHeight = w;
+    } else {
+        mDisplayWidth = w;
+        mDisplayHeight = h;
+    }
+
+    setOrientation(ISurfaceComposer::eOrientationDefault);
+}
+
+status_t GraphicPlane::orientationToTransfrom(
+        int orientation, int w, int h, Transform* tr)
+{
+    uint32_t flags = 0;
+    switch (orientation) {
+    case ISurfaceComposer::eOrientationDefault:
+        flags = Transform::ROT_0;
+        break;
+    case ISurfaceComposer::eOrientation90:
+        flags = Transform::ROT_90;
+        break;
+    case ISurfaceComposer::eOrientation180:
+        flags = Transform::ROT_180;
+        break;
+    case ISurfaceComposer::eOrientation270:
+        flags = Transform::ROT_270;
+        break;
+    default:
+        return BAD_VALUE;
+    }
+    tr->set(flags, w, h);
+    return NO_ERROR;
+}
+
+status_t GraphicPlane::setOrientation(int orientation)
+{
+    // If the rotation can be handled in hardware, this is where
+    // the magic should happen.
+
+    const DisplayHardware& hw(displayHardware());
+    const float w = mDisplayWidth;
+    const float h = mDisplayHeight;
+    mWidth = int(w);
+    mHeight = int(h);
+
+    Transform orientationTransform;
+    GraphicPlane::orientationToTransfrom(orientation, w, h,
+            &orientationTransform);
+    if (orientation & ISurfaceComposer::eOrientationSwapMask) {
+        mWidth = int(h);
+        mHeight = int(w);
+    }
+
+    mOrientation = orientation;
+    mGlobalTransform = mDisplayTransform * orientationTransform;
+    return NO_ERROR;
+}
+
+const DisplayHardware& GraphicPlane::displayHardware() const {
+    return *mHw;
+}
+
+const Transform& GraphicPlane::transform() const {
+    return mGlobalTransform;
+}
+
+EGLDisplay GraphicPlane::getEGLDisplay() const {
+    return mHw->getEGLDisplay();
+}
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
new file mode 100644
index 0000000..0bfc170
--- /dev/null
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -0,0 +1,420 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_SURFACE_FLINGER_H
+#define ANDROID_SURFACE_FLINGER_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <utils/SortedVector.h>
+#include <utils/KeyedVector.h>
+#include <utils/threads.h>
+#include <utils/Atomic.h>
+#include <utils/Errors.h>
+#include <utils/RefBase.h>
+
+#include <binder/IMemory.h>
+#include <binder/Permission.h>
+
+#include <ui/PixelFormat.h>
+#include <surfaceflinger/ISurfaceComposer.h>
+#include <surfaceflinger/ISurfaceComposerClient.h>
+
+#include "Barrier.h"
+#include "Layer.h"
+
+#include "MessageQueue.h"
+
+struct copybit_device_t;
+struct overlay_device_t;
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+class Client;
+class DisplayHardware;
+class FreezeLock;
+class Layer;
+class LayerBlur;
+class LayerDim;
+class LayerBuffer;
+
+#define LIKELY( exp )       (__builtin_expect( (exp) != 0, true  ))
+#define UNLIKELY( exp )     (__builtin_expect( (exp) != 0, false ))
+
+// ---------------------------------------------------------------------------
+
+class Client : public BnSurfaceComposerClient
+{
+public:
+        Client(const sp<SurfaceFlinger>& flinger);
+        ~Client();
+
+    status_t initCheck() const;
+
+    // protected by SurfaceFlinger::mStateLock
+    ssize_t attachLayer(const sp<LayerBaseClient>& layer);
+    void detachLayer(const LayerBaseClient* layer);
+    sp<LayerBaseClient> getLayerUser(int32_t i) const;
+
+private:
+
+    // ISurfaceComposerClient interface
+    virtual sp<IMemoryHeap> getControlBlock() const;
+    virtual ssize_t getTokenForSurface(const sp<ISurface>& sur) const;
+    virtual sp<ISurface> createSurface(
+            surface_data_t* params, int pid, const String8& name,
+            DisplayID display, uint32_t w, uint32_t h,PixelFormat format,
+            uint32_t flags);
+    virtual status_t destroySurface(SurfaceID surfaceId);
+    virtual status_t setState(int32_t count, const layer_state_t* states);
+
+    DefaultKeyedVector< size_t, wp<LayerBaseClient> > mLayers;
+    sp<SurfaceFlinger> mFlinger;
+    int32_t mNameGenerator;
+};
+
+class UserClient : public BnSurfaceComposerClient
+{
+public:
+    // pointer to this client's control block
+    SharedClient* ctrlblk;
+
+public:
+        UserClient(const sp<SurfaceFlinger>& flinger);
+        ~UserClient();
+
+    status_t initCheck() const;
+
+    // protected by SurfaceFlinger::mStateLock
+    void detachLayer(const Layer* layer);
+
+private:
+
+    // ISurfaceComposerClient interface
+    virtual sp<IMemoryHeap> getControlBlock() const;
+    virtual ssize_t getTokenForSurface(const sp<ISurface>& sur) const;
+    virtual sp<ISurface> createSurface(
+            surface_data_t* params, int pid, const String8& name,
+            DisplayID display, uint32_t w, uint32_t h,PixelFormat format,
+            uint32_t flags);
+    virtual status_t destroySurface(SurfaceID surfaceId);
+    virtual status_t setState(int32_t count, const layer_state_t* states);
+
+    // atomic-ops
+    mutable volatile int32_t mBitmap;
+
+    sp<IMemoryHeap> mCblkHeap;
+    sp<SurfaceFlinger> mFlinger;
+};
+
+// ---------------------------------------------------------------------------
+
+class GraphicPlane
+{
+public:
+    static status_t orientationToTransfrom(int orientation, int w, int h,
+            Transform* tr);
+
+                                GraphicPlane();
+                                ~GraphicPlane();
+
+        bool                    initialized() const;
+
+        void                    setDisplayHardware(DisplayHardware *);
+        status_t                setOrientation(int orientation);
+        int                     getOrientation() const { return mOrientation; }
+        int                     getWidth() const;
+        int                     getHeight() const;
+
+        const DisplayHardware&  displayHardware() const;
+        const Transform&        transform() const;
+        EGLDisplay              getEGLDisplay() const;
+        
+private:
+                                GraphicPlane(const GraphicPlane&);
+        GraphicPlane            operator = (const GraphicPlane&);
+
+        DisplayHardware*        mHw;
+        Transform               mGlobalTransform;
+        Transform               mDisplayTransform;
+        int                     mOrientation;
+        float                   mDisplayWidth;
+        float                   mDisplayHeight;
+        int                     mWidth;
+        int                     mHeight;
+};
+
+// ---------------------------------------------------------------------------
+
+enum {
+    eTransactionNeeded      = 0x01,
+    eTraversalNeeded        = 0x02
+};
+
+class SurfaceFlinger : public BnSurfaceComposer, protected Thread
+{
+public:
+    static void instantiate();
+    static void shutdown();
+
+                    SurfaceFlinger();
+    virtual         ~SurfaceFlinger();
+            void    init();
+
+    virtual status_t onTransact(
+        uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags);
+
+    virtual status_t dump(int fd, const Vector<String16>& args);
+
+    // ISurfaceComposer interface
+    virtual sp<ISurfaceComposerClient>  createConnection();
+    virtual sp<ISurfaceComposerClient>  createClientConnection();
+    virtual sp<IMemoryHeap>             getCblk() const;
+    virtual void                        bootFinished();
+    virtual void                        openGlobalTransaction();
+    virtual void                        closeGlobalTransaction();
+    virtual status_t                    freezeDisplay(DisplayID dpy, uint32_t flags);
+    virtual status_t                    unfreezeDisplay(DisplayID dpy, uint32_t flags);
+    virtual int                         setOrientation(DisplayID dpy, int orientation, uint32_t flags);
+    virtual void                        signal() const;
+
+            void                        screenReleased(DisplayID dpy);
+            void                        screenAcquired(DisplayID dpy);
+
+            overlay_control_device_t* getOverlayEngine() const;
+
+    status_t removeLayer(const sp<LayerBase>& layer);
+    status_t addLayer(const sp<LayerBase>& layer);
+    status_t invalidateLayerVisibility(const sp<LayerBase>& layer);
+
+    sp<Layer> getLayer(const sp<ISurface>& sur) const;
+
+private:
+    friend class Client;
+    friend class LayerBase;
+    friend class LayerBuffer;
+    friend class LayerBaseClient;
+    friend class LayerBaseClient::Surface;
+    friend class Layer;
+    friend class LayerBlur;
+    friend class LayerDim;
+
+    sp<ISurface> createSurface(const sp<Client>& client,
+            int pid, const String8& name,
+            ISurfaceComposerClient::surface_data_t* params,
+            DisplayID display, uint32_t w, uint32_t h, PixelFormat format,
+            uint32_t flags);
+
+    sp<Layer> createNormalSurface(
+            const sp<Client>& client, DisplayID display,
+            uint32_t w, uint32_t h, uint32_t flags,
+            PixelFormat& format);
+
+    sp<LayerBlur> createBlurSurface(
+            const sp<Client>& client, DisplayID display,
+            uint32_t w, uint32_t h, uint32_t flags);
+
+    sp<LayerDim> createDimSurface(
+            const sp<Client>& client, DisplayID display,
+            uint32_t w, uint32_t h, uint32_t flags);
+
+    sp<LayerBuffer> createPushBuffersSurface(
+            const sp<Client>& client, DisplayID display,
+            uint32_t w, uint32_t h, uint32_t flags);
+
+    status_t removeSurface(const sp<Client>& client, SurfaceID sid);
+    status_t destroySurface(const sp<LayerBaseClient>& layer);
+    status_t setClientState(const sp<Client>& client,
+            int32_t count, const layer_state_t* states);
+
+
+    class LayerVector {
+    public:
+        inline              LayerVector() { }
+                            LayerVector(const LayerVector&);
+        inline size_t       size() const { return layers.size(); }
+        inline sp<LayerBase> const* array() const { return layers.array(); }
+        ssize_t             add(const sp<LayerBase>&, Vector< sp<LayerBase> >::compar_t);
+        ssize_t             remove(const sp<LayerBase>&);
+        ssize_t             reorder(const sp<LayerBase>&, Vector< sp<LayerBase> >::compar_t);
+        ssize_t             indexOf(const sp<LayerBase>& key, size_t guess=0) const;
+        inline sp<LayerBase> operator [] (size_t i) const { return layers[i]; }
+    private:
+        KeyedVector< sp<LayerBase> , size_t> lookup;
+        Vector< sp<LayerBase> >              layers;
+    };
+
+    struct State {
+        State() {
+            orientation = ISurfaceComposer::eOrientationDefault;
+            freezeDisplay = 0;
+        }
+        LayerVector     layersSortedByZ;
+        uint8_t         orientation;
+        uint8_t         orientationType;
+        uint8_t         freezeDisplay;
+    };
+
+    virtual bool        threadLoop();
+    virtual status_t    readyToRun();
+    virtual void        onFirstRef();
+
+public:     // hack to work around gcc 4.0.3 bug
+    const GraphicPlane&     graphicPlane(int dpy) const;
+          GraphicPlane&     graphicPlane(int dpy);
+private:
+
+            void        waitForEvent();
+public:     // hack to work around gcc 4.0.3 bug
+            void        signalEvent();
+private:
+            void        handleConsoleEvents();
+            void        handleTransaction(uint32_t transactionFlags);
+            void        handleTransactionLocked(
+                            uint32_t transactionFlags, 
+                            Vector< sp<LayerBase> >& ditchedLayers);
+
+            void        computeVisibleRegions(
+                            LayerVector& currentLayers,
+                            Region& dirtyRegion,
+                            Region& wormholeRegion);
+
+            void        handlePageFlip();
+            bool        lockPageFlip(const LayerVector& currentLayers);
+            void        unlockPageFlip(const LayerVector& currentLayers);
+            void        handleRepaint();
+            void        postFramebuffer();
+            void        composeSurfaces(const Region& dirty);
+            void        unlockClients();
+
+
+            ssize_t     addClientLayer(const sp<Client>& client,
+                    const sp<LayerBaseClient>& lbc);
+            status_t    addLayer_l(const sp<LayerBase>& layer);
+            status_t    removeLayer_l(const sp<LayerBase>& layer);
+            status_t    purgatorizeLayer_l(const sp<LayerBase>& layer);
+
+            uint32_t    getTransactionFlags(uint32_t flags);
+            uint32_t    setTransactionFlags(uint32_t flags);
+            void        commitTransaction();
+
+
+            friend class FreezeLock;
+            sp<FreezeLock> getFreezeLock() const;
+            inline void incFreezeCount() {
+                if (mFreezeCount == 0)
+                    mFreezeDisplayTime = 0;
+                mFreezeCount++;
+            }
+            inline void decFreezeCount() { if (mFreezeCount > 0) mFreezeCount--; }
+            inline bool hasFreezeRequest() const { return mFreezeDisplay; }
+            inline bool isFrozen() const { 
+                return (mFreezeDisplay || mFreezeCount>0) && mBootFinished;
+            }
+
+            
+            void        debugFlashRegions();
+            void        debugShowFPS() const;
+            void        drawWormhole() const;
+           
+
+    mutable     MessageQueue    mEventQueue;
+
+    status_t postMessageAsync(const sp<MessageBase>& msg,
+            nsecs_t reltime=0, uint32_t flags = 0);
+
+    status_t postMessageSync(const sp<MessageBase>& msg,
+            nsecs_t reltime=0, uint32_t flags = 0);
+
+                // access must be protected by mStateLock
+    mutable     Mutex                   mStateLock;
+                State                   mCurrentState;
+                State                   mDrawingState;
+    volatile    int32_t                 mTransactionFlags;
+    volatile    int32_t                 mTransactionCount;
+                Condition               mTransactionCV;
+                bool                    mResizeTransationPending;
+
+                // protected by mStateLock (but we could use another lock)
+                GraphicPlane                mGraphicPlanes[1];
+                bool                        mLayersRemoved;
+                DefaultKeyedVector< wp<IBinder>, wp<Layer> > mLayerMap;
+
+                // constant members (no synchronization needed for access)
+                sp<IMemoryHeap>             mServerHeap;
+                surface_flinger_cblk_t*     mServerCblk;
+                GLuint                      mWormholeTexName;
+                nsecs_t                     mBootTime;
+                Permission                  mHardwareTest;
+                Permission                  mAccessSurfaceFlinger;
+                Permission                  mDump;
+                
+                // Can only accessed from the main thread, these members
+                // don't need synchronization
+                Region                      mDirtyRegion;
+                Region                      mDirtyRegionRemovedLayer;
+                Region                      mInvalidRegion;
+                Region                      mWormholeRegion;
+                bool                        mVisibleRegionsDirty;
+                bool                        mDeferReleaseConsole;
+                bool                        mFreezeDisplay;
+                int32_t                     mFreezeCount;
+                nsecs_t                     mFreezeDisplayTime;
+
+                // don't use a lock for these, we don't care
+                int                         mDebugRegion;
+                int                         mDebugBackground;
+                volatile nsecs_t            mDebugInSwapBuffers;
+                nsecs_t                     mLastSwapBufferTime;
+                volatile nsecs_t            mDebugInTransaction;
+                nsecs_t                     mLastTransactionTime;
+                bool                        mBootFinished;
+
+                // these are thread safe
+    mutable     Barrier                     mReadyToRunBarrier;
+
+                // atomic variables
+                enum {
+                    eConsoleReleased = 1,
+                    eConsoleAcquired = 2
+                };
+   volatile     int32_t                     mConsoleSignals;
+
+   // only written in the main thread, only read in other threads
+   volatile     int32_t                     mSecureFrameBuffer;
+};
+
+// ---------------------------------------------------------------------------
+
+class FreezeLock : public LightRefBase<FreezeLock> {
+    SurfaceFlinger* mFlinger;
+public:
+    FreezeLock(SurfaceFlinger* flinger)
+        : mFlinger(flinger) {
+        mFlinger->incFreezeCount();
+    }
+    ~FreezeLock() {
+        mFlinger->decFreezeCount();
+    }
+};
+
+// ---------------------------------------------------------------------------
+}; // namespace android
+
+#endif // ANDROID_SURFACE_FLINGER_H
diff --git a/services/surfaceflinger/TextureManager.cpp b/services/surfaceflinger/TextureManager.cpp
new file mode 100644
index 0000000..3b326df
--- /dev/null
+++ b/services/surfaceflinger/TextureManager.cpp
@@ -0,0 +1,342 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <utils/Errors.h>
+#include <utils/Log.h>
+
+#include <ui/GraphicBuffer.h>
+
+#include <GLES/gl.h>
+#include <GLES/glext.h>
+
+#include <hardware/hardware.h>
+
+#include "clz.h"
+#include "DisplayHardware/DisplayHardware.h"
+#include "GLExtensions.h"
+#include "TextureManager.h"
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+TextureManager::TextureManager()
+    : mGLExtensions(GLExtensions::getInstance())
+{
+}
+
+GLenum TextureManager::getTextureTarget(const Image* image) {
+#if defined(GL_OES_texture_external)
+    switch (image->target) {
+        case Texture::TEXTURE_EXTERNAL:
+            return GL_TEXTURE_EXTERNAL_OES;
+    }
+#endif
+    return GL_TEXTURE_2D;
+}
+
+status_t TextureManager::initTexture(Texture* texture)
+{
+    if (texture->name != -1UL)
+        return INVALID_OPERATION;
+
+    GLuint textureName = -1;
+    glGenTextures(1, &textureName);
+    texture->name = textureName;
+    texture->width = 0;
+    texture->height = 0;
+
+    const GLenum target = GL_TEXTURE_2D;
+    glBindTexture(target, textureName);
+    glTexParameterx(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameterx(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexParameterx(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameterx(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+    return NO_ERROR;
+}
+
+status_t TextureManager::initTexture(Image* pImage, int32_t format)
+{
+    if (pImage->name != -1UL)
+        return INVALID_OPERATION;
+
+    GLuint textureName = -1;
+    glGenTextures(1, &textureName);
+    pImage->name = textureName;
+    pImage->width = 0;
+    pImage->height = 0;
+
+    GLenum target = GL_TEXTURE_2D;
+#if defined(GL_OES_texture_external)
+    if (GLExtensions::getInstance().haveTextureExternal()) {
+        if (format && isYuvFormat(format)) {
+            target = GL_TEXTURE_EXTERNAL_OES;
+            pImage->target = Texture::TEXTURE_EXTERNAL;
+        }
+    }
+#endif
+
+    glBindTexture(target, textureName);
+    glTexParameterx(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameterx(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexParameterx(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameterx(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+    return NO_ERROR;
+}
+
+bool TextureManager::isSupportedYuvFormat(int format)
+{
+    switch (format) {
+    case HAL_PIXEL_FORMAT_YV12:
+        return true;
+    }
+    return false;
+}
+
+bool TextureManager::isYuvFormat(int format)
+{
+    switch (format) {
+    // supported YUV formats
+    case HAL_PIXEL_FORMAT_YV12:
+    // Legacy/deprecated YUV formats
+    case HAL_PIXEL_FORMAT_YCbCr_422_SP:
+    case HAL_PIXEL_FORMAT_YCrCb_420_SP:
+    case HAL_PIXEL_FORMAT_YCbCr_422_I:
+    case HAL_PIXEL_FORMAT_YCbCr_420_SP_TILED:
+        return true;
+    }
+
+    // Any OEM format needs to be considered
+    if (format>=0x100 && format<=0x1FF)
+        return true;
+
+    return false;
+}
+
+status_t TextureManager::initEglImage(Image* pImage,
+        EGLDisplay dpy, const sp<GraphicBuffer>& buffer)
+{
+    status_t err = NO_ERROR;
+    if (!pImage->dirty) return err;
+
+    // free the previous image
+    if (pImage->image != EGL_NO_IMAGE_KHR) {
+        eglDestroyImageKHR(dpy, pImage->image);
+        pImage->image = EGL_NO_IMAGE_KHR;
+    }
+
+    // construct an EGL_NATIVE_BUFFER_ANDROID
+    android_native_buffer_t* clientBuf = buffer->getNativeBuffer();
+
+    // create the new EGLImageKHR
+    const EGLint attrs[] = {
+            EGL_IMAGE_PRESERVED_KHR,    EGL_TRUE,
+            EGL_NONE,                   EGL_NONE
+    };
+    pImage->image = eglCreateImageKHR(
+            dpy, EGL_NO_CONTEXT, EGL_NATIVE_BUFFER_ANDROID,
+            (EGLClientBuffer)clientBuf, attrs);
+
+    if (pImage->image != EGL_NO_IMAGE_KHR) {
+        if (pImage->name == -1UL) {
+            initTexture(pImage, buffer->format);
+        }
+        const GLenum target = getTextureTarget(pImage);
+        glBindTexture(target, pImage->name);
+        glEGLImageTargetTexture2DOES(target, (GLeglImageOES)pImage->image);
+        GLint error = glGetError();
+        if (error != GL_NO_ERROR) {
+            LOGE("glEGLImageTargetTexture2DOES(%p) failed err=0x%04x",
+                    pImage->image, error);
+            err = INVALID_OPERATION;
+        } else {
+            // Everything went okay!
+            pImage->dirty  = false;
+            pImage->width  = clientBuf->width;
+            pImage->height = clientBuf->height;
+        }
+    } else {
+        LOGE("eglCreateImageKHR() failed. err=0x%4x", eglGetError());
+        err = INVALID_OPERATION;
+    }
+    return err;
+}
+
+status_t TextureManager::loadTexture(Texture* texture,
+        const Region& dirty, const GGLSurface& t)
+{
+    if (texture->name == -1UL) {
+        status_t err = initTexture(texture);
+        LOGE_IF(err, "loadTexture failed in initTexture (%s)", strerror(err));
+        return err;
+    }
+
+    if (texture->target != GL_TEXTURE_2D)
+        return INVALID_OPERATION;
+
+    glBindTexture(GL_TEXTURE_2D, texture->name);
+
+    /*
+     * In OpenGL ES we can't specify a stride with glTexImage2D (however,
+     * GL_UNPACK_ALIGNMENT is a limited form of stride).
+     * So if the stride here isn't representable with GL_UNPACK_ALIGNMENT, we
+     * need to do something reasonable (here creating a bigger texture).
+     *
+     * extra pixels = (((stride - width) * pixelsize) / GL_UNPACK_ALIGNMENT);
+     *
+     * This situation doesn't happen often, but some h/w have a limitation
+     * for their framebuffer (eg: must be multiple of 8 pixels), and
+     * we need to take that into account when using these buffers as
+     * textures.
+     *
+     * This should never be a problem with POT textures
+     */
+
+    int unpack = __builtin_ctz(t.stride * bytesPerPixel(t.format));
+    unpack = 1 << ((unpack > 3) ? 3 : unpack);
+    glPixelStorei(GL_UNPACK_ALIGNMENT, unpack);
+
+    /*
+     * round to POT if needed
+     */
+    if (!mGLExtensions.haveNpot()) {
+        texture->NPOTAdjust = true;
+    }
+
+    if (texture->NPOTAdjust) {
+        // find the smallest power-of-two that will accommodate our surface
+        texture->potWidth  = 1 << (31 - clz(t.width));
+        texture->potHeight = 1 << (31 - clz(t.height));
+        if (texture->potWidth  < t.width)  texture->potWidth  <<= 1;
+        if (texture->potHeight < t.height) texture->potHeight <<= 1;
+        texture->wScale = float(t.width)  / texture->potWidth;
+        texture->hScale = float(t.height) / texture->potHeight;
+    } else {
+        texture->potWidth  = t.width;
+        texture->potHeight = t.height;
+    }
+
+    Rect bounds(dirty.bounds());
+    GLvoid* data = 0;
+    if (texture->width != t.width || texture->height != t.height) {
+        texture->width  = t.width;
+        texture->height = t.height;
+
+        // texture size changed, we need to create a new one
+        bounds.set(Rect(t.width, t.height));
+        if (t.width  == texture->potWidth &&
+            t.height == texture->potHeight) {
+            // we can do it one pass
+            data = t.data;
+        }
+
+        if (t.format == HAL_PIXEL_FORMAT_RGB_565) {
+            glTexImage2D(GL_TEXTURE_2D, 0,
+                    GL_RGB, texture->potWidth, texture->potHeight, 0,
+                    GL_RGB, GL_UNSIGNED_SHORT_5_6_5, data);
+        } else if (t.format == HAL_PIXEL_FORMAT_RGBA_4444) {
+            glTexImage2D(GL_TEXTURE_2D, 0,
+                    GL_RGBA, texture->potWidth, texture->potHeight, 0,
+                    GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, data);
+        } else if (t.format == HAL_PIXEL_FORMAT_RGBA_8888 ||
+                   t.format == HAL_PIXEL_FORMAT_RGBX_8888) {
+            glTexImage2D(GL_TEXTURE_2D, 0,
+                    GL_RGBA, texture->potWidth, texture->potHeight, 0,
+                    GL_RGBA, GL_UNSIGNED_BYTE, data);
+        } else if (isSupportedYuvFormat(t.format)) {
+            // just show the Y plane of YUV buffers
+            glTexImage2D(GL_TEXTURE_2D, 0,
+                    GL_LUMINANCE, texture->potWidth, texture->potHeight, 0,
+                    GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
+        } else {
+            // oops, we don't handle this format!
+            LOGE("texture=%d, using format %d, which is not "
+                 "supported by the GL", texture->name, t.format);
+        }
+    }
+    if (!data) {
+        if (t.format == HAL_PIXEL_FORMAT_RGB_565) {
+            glTexSubImage2D(GL_TEXTURE_2D, 0,
+                    0, bounds.top, t.width, bounds.height(),
+                    GL_RGB, GL_UNSIGNED_SHORT_5_6_5,
+                    t.data + bounds.top*t.stride*2);
+        } else if (t.format == HAL_PIXEL_FORMAT_RGBA_4444) {
+            glTexSubImage2D(GL_TEXTURE_2D, 0,
+                    0, bounds.top, t.width, bounds.height(),
+                    GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4,
+                    t.data + bounds.top*t.stride*2);
+        } else if (t.format == HAL_PIXEL_FORMAT_RGBA_8888 ||
+                   t.format == HAL_PIXEL_FORMAT_RGBX_8888) {
+            glTexSubImage2D(GL_TEXTURE_2D, 0,
+                    0, bounds.top, t.width, bounds.height(),
+                    GL_RGBA, GL_UNSIGNED_BYTE,
+                    t.data + bounds.top*t.stride*4);
+        } else if (isSupportedYuvFormat(t.format)) {
+            // just show the Y plane of YUV buffers
+            glTexSubImage2D(GL_TEXTURE_2D, 0,
+                    0, bounds.top, t.width, bounds.height(),
+                    GL_LUMINANCE, GL_UNSIGNED_BYTE,
+                    t.data + bounds.top*t.stride);
+        }
+    }
+    return NO_ERROR;
+}
+
+void TextureManager::activateTexture(const Texture& texture, bool filter)
+{
+    const GLenum target = getTextureTarget(&texture);
+    if (target == GL_TEXTURE_2D) {
+        glBindTexture(GL_TEXTURE_2D, texture.name);
+        glEnable(GL_TEXTURE_2D);
+#if defined(GL_OES_texture_external)
+        if (GLExtensions::getInstance().haveTextureExternal()) {
+            glDisable(GL_TEXTURE_EXTERNAL_OES);
+        }
+    } else {
+        glBindTexture(GL_TEXTURE_EXTERNAL_OES, texture.name);
+        glEnable(GL_TEXTURE_EXTERNAL_OES);
+        glDisable(GL_TEXTURE_2D);
+#endif
+    }
+
+    if (filter) {
+        glTexParameterx(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        glTexParameterx(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    } else {
+        glTexParameterx(target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+        glTexParameterx(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    }
+}
+
+void TextureManager::deactivateTextures()
+{
+    glDisable(GL_TEXTURE_2D);
+#if defined(GL_OES_texture_external)
+    if (GLExtensions::getInstance().haveTextureExternal()) {
+        glDisable(GL_TEXTURE_EXTERNAL_OES);
+    }
+#endif
+}
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
diff --git a/services/surfaceflinger/TextureManager.h b/services/surfaceflinger/TextureManager.h
new file mode 100644
index 0000000..c7c14e7
--- /dev/null
+++ b/services/surfaceflinger/TextureManager.h
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_TEXTURE_MANAGER_H
+#define ANDROID_TEXTURE_MANAGER_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <GLES/gl.h>
+
+#include <ui/Region.h>
+
+#include <pixelflinger/pixelflinger.h>
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+class GLExtensions;
+class GraphicBuffer;
+
+// ---------------------------------------------------------------------------
+
+struct Image {
+    enum { TEXTURE_2D=0, TEXTURE_EXTERNAL=1 };
+    Image() : name(-1U), image(EGL_NO_IMAGE_KHR), width(0), height(0),
+        transform(0), dirty(1), target(TEXTURE_2D) { }
+    GLuint        name;
+    EGLImageKHR   image;
+    GLuint        width;
+    GLuint        height;
+    uint32_t      transform;
+    unsigned      dirty     : 1;
+    unsigned      target    : 1;
+};
+
+struct Texture : public Image {
+    Texture() : Image(), NPOTAdjust(0) { }
+    GLuint      potWidth;
+    GLuint      potHeight;
+    GLfloat     wScale;
+    GLfloat     hScale;
+    unsigned    NPOTAdjust  : 1;
+};
+
+// ---------------------------------------------------------------------------
+
+class TextureManager {
+    const GLExtensions& mGLExtensions;
+    static status_t initTexture(Image* texture, int32_t format);
+    static status_t initTexture(Texture* texture);
+    static bool isSupportedYuvFormat(int format);
+    static bool isYuvFormat(int format);
+    static GLenum getTextureTarget(const Image* pImage);
+public:
+
+    TextureManager();
+
+    // load bitmap data into the active buffer
+    status_t loadTexture(Texture* texture,
+            const Region& dirty, const GGLSurface& t);
+
+    // make active buffer an EGLImage if needed
+    status_t initEglImage(Image* texture,
+            EGLDisplay dpy, const sp<GraphicBuffer>& buffer);
+
+    // activate a texture
+    static void activateTexture(const Texture& texture, bool filter);
+
+    // deactivate a texture
+    static void deactivateTextures();
+};
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
+
+#endif // ANDROID_TEXTURE_MANAGER_H
diff --git a/services/surfaceflinger/Transform.cpp b/services/surfaceflinger/Transform.cpp
new file mode 100644
index 0000000..5e27cc9
--- /dev/null
+++ b/services/surfaceflinger/Transform.cpp
@@ -0,0 +1,391 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <math.h>
+
+#include <cutils/compiler.h>
+#include <utils/String8.h>
+#include <ui/Region.h>
+
+#include "Transform.h"
+
+// ---------------------------------------------------------------------------
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+template <typename T> inline T min(T a, T b) {
+    return a<b ? a : b;
+}
+template <typename T> inline T min(T a, T b, T c) {
+    return min(a, min(b, c));
+}
+template <typename T> inline T min(T a, T b, T c, T d) {
+    return min(a, b, min(c, d));
+}
+
+template <typename T> inline T max(T a, T b) {
+    return a>b ? a : b;
+}
+template <typename T> inline T max(T a, T b, T c) {
+    return max(a, max(b, c));
+}
+template <typename T> inline T max(T a, T b, T c, T d) {
+    return max(a, b, max(c, d));
+}
+
+// ---------------------------------------------------------------------------
+
+Transform::Transform() {
+    reset();
+}
+
+Transform::Transform(const Transform&  other)
+    : mMatrix(other.mMatrix), mType(other.mType) {
+}
+
+Transform::Transform(uint32_t orientation) {
+    set(orientation, 0, 0);
+}
+
+Transform::~Transform() {
+}
+
+static const float EPSILON = 0.0f;
+
+bool Transform::isZero(float f) {
+    return fabs(f) <= EPSILON;
+}
+
+bool Transform::absIsOne(float f) {
+    return isZero(fabs(f) - 1.0f);
+}
+
+Transform Transform::operator * (const Transform& rhs) const
+{
+    if (CC_LIKELY(mType == IDENTITY))
+        return rhs;
+
+    Transform r(*this);
+    if (rhs.mType == IDENTITY)
+        return r;
+
+    // TODO: we could use mType to optimize the matrix multiply
+    const mat33& A(mMatrix);
+    const mat33& B(rhs.mMatrix);
+          mat33& D(r.mMatrix);
+    for (int i=0 ; i<3 ; i++) {
+        const float v0 = A[0][i];
+        const float v1 = A[1][i];
+        const float v2 = A[2][i];
+        D[0][i] = v0*B[0][0] + v1*B[0][1] + v2*B[0][2];
+        D[1][i] = v0*B[1][0] + v1*B[1][1] + v2*B[1][2];
+        D[2][i] = v0*B[2][0] + v1*B[2][1] + v2*B[2][2];
+    }
+    r.mType |= rhs.mType;
+
+    // TODO: we could recompute this value from r and rhs
+    r.mType &= 0xFF;
+    r.mType |= UNKNOWN_TYPE;
+    return r;
+}
+
+float const* Transform::operator [] (int i) const {
+    return mMatrix[i].v;
+}
+
+bool Transform::transformed() const {
+    return type() > TRANSLATE;
+}
+
+int Transform::tx() const {
+    return floorf(mMatrix[2][0] + 0.5f);
+}
+
+int Transform::ty() const {
+    return floorf(mMatrix[2][1] + 0.5f);
+}
+
+void Transform::reset() {
+    mType = IDENTITY;
+    for(int i=0 ; i<3 ; i++) {
+        vec3& v(mMatrix[i]);
+        for (int j=0 ; j<3 ; j++)
+            v[j] = ((i==j) ? 1.0f : 0.0f);
+    }
+}
+
+void Transform::set(float tx, float ty)
+{
+    mMatrix[2][0] = tx;
+    mMatrix[2][1] = ty;
+    mMatrix[2][2] = 1.0f;
+
+    if (isZero(tx) && isZero(ty)) {
+        mType &= ~TRANSLATE;
+    } else {
+        mType |= TRANSLATE;
+    }
+}
+
+void Transform::set(float a, float b, float c, float d)
+{
+    mat33& M(mMatrix);
+    M[0][0] = a;    M[1][0] = b;
+    M[0][1] = c;    M[1][1] = d;
+    M[0][2] = 0;    M[1][2] = 0;
+    mType = UNKNOWN_TYPE;
+}
+
+status_t Transform::set(uint32_t flags, float w, float h)
+{
+    if (flags & ROT_INVALID) {
+        // that's not allowed!
+        reset();
+        return BAD_VALUE;
+    }
+
+    mType = flags << 8;
+    float sx = (flags & FLIP_H) ? -1 : 1;
+    float sy = (flags & FLIP_V) ? -1 : 1;
+    float a=0, b=0, c=0, d=0, x=0, y=0;
+    int xmask = 0;
+
+    // computation of x,y
+    // x y
+    // 0 0  0
+    // w 0  ROT90
+    // w h  FLIPH|FLIPV
+    // 0 h  FLIPH|FLIPV|ROT90
+
+    if (flags & ROT_90) {
+        mType |= ROTATE;
+        b = -sy;
+        c = sx;
+        xmask = 1;
+    } else {
+        a = sx;
+        d = sy;
+    }
+
+    if (flags & FLIP_H) {
+        mType ^= SCALE;
+        xmask ^= 1;
+    }
+
+    if (flags & FLIP_V) {
+        mType ^= SCALE;
+        y = h;
+    }
+
+    if ((flags & ROT_180) == ROT_180) {
+        mType |= ROTATE;
+    }
+
+    if (xmask) {
+        x = w;
+    }
+
+    if (!isZero(x) || !isZero(y)) {
+        mType |= TRANSLATE;
+    }
+
+    mat33& M(mMatrix);
+    M[0][0] = a;    M[1][0] = b;    M[2][0] = x;
+    M[0][1] = c;    M[1][1] = d;    M[2][1] = y;
+    M[0][2] = 0;    M[1][2] = 0;    M[2][2] = 1;
+
+    return NO_ERROR;
+}
+
+Transform::vec2 Transform::transform(const vec2& v) const {
+    vec2 r;
+    const mat33& M(mMatrix);
+    r[0] = M[0][0]*v[0] + M[1][0]*v[1] + M[2][0];
+    r[1] = M[0][1]*v[0] + M[1][1]*v[1] + M[2][1];
+    return r;
+}
+
+Transform::vec3 Transform::transform(const vec3& v) const {
+    vec3 r;
+    const mat33& M(mMatrix);
+    r[0] = M[0][0]*v[0] + M[1][0]*v[1] + M[2][0]*v[2];
+    r[1] = M[0][1]*v[0] + M[1][1]*v[1] + M[2][1]*v[2];
+    r[2] = M[0][2]*v[0] + M[1][2]*v[1] + M[2][2]*v[2];
+    return r;
+}
+
+void Transform::transform(float* point, int x, int y) const
+{
+    const mat33& M(mMatrix);
+    vec2 v(x, y);
+    v = transform(v);
+    point[0] = v[0];
+    point[1] = v[1];
+}
+
+Rect Transform::makeBounds(int w, int h) const
+{
+    return transform( Rect(w, h) );
+}
+
+Rect Transform::transform(const Rect& bounds) const
+{
+    Rect r;
+    vec2 lt( bounds.left,  bounds.top    );
+    vec2 rt( bounds.right, bounds.top    );
+    vec2 lb( bounds.left,  bounds.bottom );
+    vec2 rb( bounds.right, bounds.bottom );
+
+    lt = transform(lt);
+    rt = transform(rt);
+    lb = transform(lb);
+    rb = transform(rb);
+
+    r.left   = floorf(min(lt[0], rt[0], lb[0], rb[0]) + 0.5f);
+    r.top    = floorf(min(lt[1], rt[1], lb[1], rb[1]) + 0.5f);
+    r.right  = floorf(max(lt[0], rt[0], lb[0], rb[0]) + 0.5f);
+    r.bottom = floorf(max(lt[1], rt[1], lb[1], rb[1]) + 0.5f);
+
+    return r;
+}
+
+Region Transform::transform(const Region& reg) const
+{
+    Region out;
+    if (CC_UNLIKELY(transformed())) {
+        if (CC_LIKELY(preserveRects())) {
+            Region::const_iterator it = reg.begin();
+            Region::const_iterator const end = reg.end();
+            while (it != end) {
+                out.orSelf(transform(*it++));
+            }
+        } else {
+            out.set(transform(reg.bounds()));
+        }
+    } else {
+        out = reg.translate(tx(), ty());
+    }
+    return out;
+}
+
+uint32_t Transform::type() const
+{
+    if (mType & UNKNOWN_TYPE) {
+        // recompute what this transform is
+
+        const mat33& M(mMatrix);
+        const float a = M[0][0];
+        const float b = M[1][0];
+        const float c = M[0][1];
+        const float d = M[1][1];
+        const float x = M[2][0];
+        const float y = M[2][1];
+
+        bool scale = false;
+        uint32_t flags = ROT_0;
+        if (isZero(b) && isZero(c)) {
+            if (a<0)    flags |= FLIP_H;
+            if (d<0)    flags |= FLIP_V;
+            if (!absIsOne(a) || !absIsOne(d)) {
+                scale = true;
+            }
+        } else if (isZero(a) && isZero(d)) {
+            flags |= ROT_90;
+            if (b>0)    flags |= FLIP_H;
+            if (c<0)    flags |= FLIP_V;
+            if (!absIsOne(b) || !absIsOne(c)) {
+                scale = true;
+            }
+        } else {
+            flags = ROT_INVALID;
+        }
+
+        mType = flags << 8;
+        if (flags & ROT_INVALID) {
+            mType |= UNKNOWN;
+        } else {
+            if ((flags & ROT_90) || ((flags & ROT_180) == ROT_180))
+                mType |= ROTATE;
+            if (flags & FLIP_H)
+                mType ^= SCALE;
+            if (flags & FLIP_V)
+                mType ^= SCALE;
+            if (scale)
+                mType |= SCALE;
+        }
+
+        if (!isZero(x) || !isZero(y))
+            mType |= TRANSLATE;
+    }
+    return mType;
+}
+
+uint32_t Transform::getType() const {
+    return type() & 0xFF;
+}
+
+uint32_t Transform::getOrientation() const
+{
+    return (type() >> 8) & 0xFF;
+}
+
+bool Transform::preserveRects() const
+{
+    return (type() & ROT_INVALID) ? false : true;
+}
+
+void Transform::dump(const char* name) const
+{
+    type(); // updates the type
+
+    String8 flags, type;
+    const mat33& m(mMatrix);
+    uint32_t orient = mType >> 8;
+
+    if (orient&ROT_INVALID) {
+        flags.append("ROT_INVALID ");
+    } else {
+        if (orient&ROT_90) {
+            flags.append("ROT_90 ");
+        } else {
+            flags.append("ROT_0 ");
+        }
+        if (orient&FLIP_V)
+            flags.append("FLIP_V ");
+        if (orient&FLIP_H)
+            flags.append("FLIP_H ");
+    }
+
+    if (!(mType&(SCALE|ROTATE|TRANSLATE)))
+        type.append("IDENTITY ");
+    if (mType&SCALE)
+        type.append("SCALE ");
+    if (mType&ROTATE)
+        type.append("ROTATE ");
+    if (mType&TRANSLATE)
+        type.append("TRANSLATE ");
+
+    LOGD("%s 0x%08x (%s, %s)", name, mType, flags.string(), type.string());
+    LOGD("%.4f  %.4f  %.4f", m[0][0], m[1][0], m[2][0]);
+    LOGD("%.4f  %.4f  %.4f", m[0][1], m[1][1], m[2][1]);
+    LOGD("%.4f  %.4f  %.4f", m[0][2], m[1][2], m[2][2]);
+}
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
diff --git a/services/surfaceflinger/Transform.h b/services/surfaceflinger/Transform.h
new file mode 100644
index 0000000..20fa11a
--- /dev/null
+++ b/services/surfaceflinger/Transform.h
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_TRANSFORM_H
+#define ANDROID_TRANSFORM_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <ui/Point.h>
+#include <ui/Rect.h>
+
+namespace android {
+
+class Region;
+
+// ---------------------------------------------------------------------------
+
+class Transform
+{
+public:
+                    Transform();
+                    Transform(const Transform&  other);
+           explicit Transform(uint32_t orientation);
+                    ~Transform();
+
+            // FIXME: must match OVERLAY_TRANSFORM_*, pull from hardware.h
+            enum orientation_flags {
+                ROT_0   = 0x00000000,
+                FLIP_H  = 0x00000001,
+                FLIP_V  = 0x00000002,
+                ROT_90  = 0x00000004,
+                ROT_180 = FLIP_H|FLIP_V,
+                ROT_270 = ROT_180|ROT_90,
+                ROT_INVALID = 0x80
+            };
+
+            enum type_mask {
+                IDENTITY            = 0,
+                TRANSLATE           = 0x1,
+                ROTATE              = 0x2,
+                SCALE               = 0x4,
+                UNKNOWN             = 0x8
+            };
+
+            // query the transform
+            bool        transformed() const;
+            bool        preserveRects() const;
+            uint32_t    getType() const;
+            uint32_t    getOrientation() const;
+
+            float const* operator [] (int i) const;  // returns column i
+            int     tx() const;
+            int     ty() const;
+
+            // modify the transform
+            void        reset();
+            void        set(float tx, float ty);
+            void        set(float a, float b, float c, float d);
+            status_t    set(uint32_t flags, float w, float h);
+
+            // transform data
+            Rect    makeBounds(int w, int h) const;
+            void    transform(float* point, int x, int y) const;
+            Region  transform(const Region& reg) const;
+            Transform operator * (const Transform& rhs) const;
+
+            // for debugging
+            void dump(const char* name) const;
+
+private:
+    struct vec3 {
+        float v[3];
+        inline vec3() { }
+        inline vec3(float a, float b, float c) {
+            v[0] = a; v[1] = b; v[2] = c;
+        }
+        inline float operator [] (int i) const { return v[i]; }
+        inline float& operator [] (int i) { return v[i]; }
+    };
+    struct vec2 {
+        float v[2];
+        inline vec2() { }
+        inline vec2(float a, float b) {
+            v[0] = a; v[1] = b;
+        }
+        inline float operator [] (int i) const { return v[i]; }
+        inline float& operator [] (int i) { return v[i]; }
+    };
+    struct mat33 {
+        vec3 v[3];
+        inline const vec3& operator [] (int i) const { return v[i]; }
+        inline vec3& operator [] (int i) { return v[i]; }
+    };
+
+    enum { UNKNOWN_TYPE = 0x80000000 };
+
+    // assumes the last row is < 0 , 0 , 1 >
+    vec2 transform(const vec2& v) const;
+    vec3 transform(const vec3& v) const;
+    Rect transform(const Rect& bounds) const;
+    uint32_t type() const;
+    static bool absIsOne(float f);
+    static bool isZero(float f);
+
+    mat33               mMatrix;
+    mutable uint32_t    mType;
+};
+
+// ---------------------------------------------------------------------------
+}; // namespace android
+
+#endif /* ANDROID_TRANSFORM_H */
diff --git a/services/surfaceflinger/clz.cpp b/services/surfaceflinger/clz.cpp
new file mode 100644
index 0000000..2456b86
--- /dev/null
+++ b/services/surfaceflinger/clz.cpp
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "clz.h"
+
+namespace android {
+
+int clz_impl(int32_t x)
+{
+#if defined(__arm__) && !defined(__thumb__)
+    return __builtin_clz(x);
+#else
+    if (!x) return 32;
+    int e = 31;
+    if (x&0xFFFF0000)   { e -=16; x >>=16; }
+    if (x&0x0000FF00)   { e -= 8; x >>= 8; }
+    if (x&0x000000F0)   { e -= 4; x >>= 4; }
+    if (x&0x0000000C)   { e -= 2; x >>= 2; }
+    if (x&0x00000002)   { e -= 1; }
+    return e;
+#endif
+}
+
+}; // namespace android
diff --git a/services/surfaceflinger/clz.h b/services/surfaceflinger/clz.h
new file mode 100644
index 0000000..0ddf986
--- /dev/null
+++ b/services/surfaceflinger/clz.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_SURFACE_FLINGER_CLZ_H
+
+#include <stdint.h>
+
+namespace android {
+
+int clz_impl(int32_t x);
+
+int inline clz(int32_t x)
+{
+#if defined(__arm__) && !defined(__thumb__)
+    return __builtin_clz(x);
+#else
+    return clz_impl(x);
+#endif
+}
+
+
+}; // namespace android
+
+#endif /* ANDROID_SURFACE_FLINGER_CLZ_H */
diff --git a/services/surfaceflinger/tests/Android.mk b/services/surfaceflinger/tests/Android.mk
new file mode 100644
index 0000000..5053e7d
--- /dev/null
+++ b/services/surfaceflinger/tests/Android.mk
@@ -0,0 +1 @@
+include $(call all-subdir-makefiles)
diff --git a/services/surfaceflinger/tests/overlays/Android.mk b/services/surfaceflinger/tests/overlays/Android.mk
new file mode 100644
index 0000000..592b601
--- /dev/null
+++ b/services/surfaceflinger/tests/overlays/Android.mk
@@ -0,0 +1,17 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+	overlays.cpp
+
+LOCAL_SHARED_LIBRARIES := \
+	libcutils \
+	libutils \
+    libui \
+    libsurfaceflinger_client
+
+LOCAL_MODULE:= test-overlays
+
+LOCAL_MODULE_TAGS := tests
+
+include $(BUILD_EXECUTABLE)
diff --git a/services/surfaceflinger/tests/overlays/overlays.cpp b/services/surfaceflinger/tests/overlays/overlays.cpp
new file mode 100644
index 0000000..c248a615
--- /dev/null
+++ b/services/surfaceflinger/tests/overlays/overlays.cpp
@@ -0,0 +1,59 @@
+#include <binder/IPCThreadState.h>
+#include <binder/ProcessState.h>
+#include <binder/IServiceManager.h>
+#include <utils/Log.h>
+
+#include <ui/Overlay.h>
+
+#include <surfaceflinger/Surface.h>
+#include <surfaceflinger/ISurface.h>
+#include <surfaceflinger/SurfaceComposerClient.h>
+
+using namespace android;
+
+namespace android {
+class Test {
+public:
+    static const sp<ISurface>& getISurface(const sp<Surface>& s) {
+        return s->getISurface();
+    }
+};
+};
+
+int main(int argc, char** argv)
+{
+    // set up the thread-pool
+    sp<ProcessState> proc(ProcessState::self());
+    ProcessState::self()->startThreadPool();
+
+    // create a client to surfaceflinger
+    sp<SurfaceComposerClient> client = new SurfaceComposerClient();
+    
+    // create pushbuffer surface
+    sp<Surface> surface = client->createSurface(getpid(), 0, 320, 240, 
+            PIXEL_FORMAT_UNKNOWN, ISurfaceComposer::ePushBuffers);
+
+    // get to the isurface
+    sp<ISurface> isurface = Test::getISurface(surface);
+    printf("isurface = %p\n", isurface.get());
+    
+    // now request an overlay
+    sp<OverlayRef> ref = isurface->createOverlay(320, 240, PIXEL_FORMAT_RGB_565);
+    sp<Overlay> overlay = new Overlay(ref);
+    
+
+    /*
+     * here we can use the overlay API 
+     */
+    
+    overlay_buffer_t buffer; 
+    overlay->dequeueBuffer(&buffer);
+    printf("buffer = %p\n", buffer);
+    
+    void* address = overlay->getBufferAddress(buffer);
+    printf("address = %p\n", address);
+
+    overlay->queueBuffer(buffer);
+
+    return 0;
+}
diff --git a/services/surfaceflinger/tests/resize/Android.mk b/services/surfaceflinger/tests/resize/Android.mk
new file mode 100644
index 0000000..24c2d01
--- /dev/null
+++ b/services/surfaceflinger/tests/resize/Android.mk
@@ -0,0 +1,17 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:= \
+	resize.cpp
+
+LOCAL_SHARED_LIBRARIES := \
+	libcutils \
+	libutils \
+    libui \
+    libsurfaceflinger_client
+
+LOCAL_MODULE:= test-resize
+
+LOCAL_MODULE_TAGS := tests
+
+include $(BUILD_EXECUTABLE)
diff --git a/services/surfaceflinger/tests/resize/resize.cpp b/services/surfaceflinger/tests/resize/resize.cpp
new file mode 100644
index 0000000..127cca3
--- /dev/null
+++ b/services/surfaceflinger/tests/resize/resize.cpp
@@ -0,0 +1,62 @@
+#include <cutils/memory.h>
+
+#include <utils/Log.h>
+
+#include <binder/IPCThreadState.h>
+#include <binder/ProcessState.h>
+#include <binder/IServiceManager.h>
+
+#include <surfaceflinger/Surface.h>
+#include <surfaceflinger/ISurface.h>
+#include <surfaceflinger/SurfaceComposerClient.h>
+
+#include <ui/Overlay.h>
+
+using namespace android;
+
+namespace android {
+class Test {
+public:
+    static const sp<ISurface>& getISurface(const sp<Surface>& s) {
+        return s->getISurface();
+    }
+};
+};
+
+int main(int argc, char** argv)
+{
+    // set up the thread-pool
+    sp<ProcessState> proc(ProcessState::self());
+    ProcessState::self()->startThreadPool();
+
+    // create a client to surfaceflinger
+    sp<SurfaceComposerClient> client = new SurfaceComposerClient();
+    
+    // create pushbuffer surface
+    sp<Surface> surface = client->createSurface(getpid(), 0, 160, 240, 
+            PIXEL_FORMAT_RGB_565);
+
+
+    client->openTransaction();
+    surface->setLayer(100000);
+    client->closeTransaction();
+
+    Surface::SurfaceInfo info;
+    surface->lock(&info);
+    ssize_t bpr = info.s * bytesPerPixel(info.format);
+    android_memset16((uint16_t*)info.bits, 0xF800, bpr*info.h);
+    surface->unlockAndPost();
+
+    surface->lock(&info);
+    android_memset16((uint16_t*)info.bits, 0x07E0, bpr*info.h);
+    surface->unlockAndPost();
+
+    client->openTransaction();
+    surface->setSize(320, 240);
+    client->closeTransaction();
+
+    
+    IPCThreadState::self()->joinThreadPool();
+    
+    return 0;
+}