Refactor some code in surfaceflinger in preparation of upcoming changes

the new TextureMagager class now handle texture creation and upload
as well as EGL image creation and binding to GraphicBuffers. This is
used indirectly by Layer and directly by LayerBuffer

the new BufferManager class handles the set of buffers used for a
Layer (Surface), it abstracts how many buffer there is as well as
the use of EGLimage vs. regular texture ops (glTexImage2D).

Change-Id: I2da1ddcf27758e6731400f6cc4e20bef35c0a39a

9 files changed, 554 insertions, 366 deletions

diff --git a/libs/surfaceflinger/Android.mk b/libs/surfaceflinger/Android.mk
index 86eb78d..b8a0630 100644
--- a/libs/surfaceflinger/Android.mk
+++ b/libs/surfaceflinger/Android.mk
@@ -13,6 +13,7 @@ LOCAL_SRC_FILES:= \
     LayerDim.cpp \
     MessageQueue.cpp \
     SurfaceFlinger.cpp \
+    TextureManager.cpp \
     Tokenizer.cpp \
     Transform.cpp
 
diff --git a/libs/surfaceflinger/Layer.cpp b/libs/surfaceflinger/Layer.cpp
index 1fdc8ea..71573ac 100644
--- a/libs/surfaceflinger/Layer.cpp
+++ b/libs/surfaceflinger/Layer.cpp
@@ -48,40 +48,48 @@ template <typename T> inline T min(T a, T b) {
 // ---------------------------------------------------------------------------
 
 Layer::Layer(SurfaceFlinger* flinger, DisplayID display, 
-        const sp<Client>& c, int32_t i)
-    :   LayerBaseClient(flinger, display, c, i),
+        const sp<Client>& client, int32_t i)
+    :   LayerBaseClient(flinger, display, client, i),
+        lcblk(NULL),
         mSecure(false),
         mNeedsBlending(true),
-        mNeedsDithering(false)
+        mNeedsDithering(false),
+        mTextureManager(mFlags),
+        mBufferManager(mTextureManager)
 {
     // no OpenGL operation is possible here, since we might not be
     // in the OpenGL thread.
-    mFrontBufferIndex = lcblk->getFrontBuffer();
+    lcblk = new SharedBufferServer(
+            client->ctrlblk, i, mBufferManager.getBufferCount(),
+            getIdentity());
+
+   mBufferManager.setActiveBufferIndex( lcblk->getFrontBuffer() );
 }
 
 Layer::~Layer()
 {
     destroy();
     // the actual buffers will be destroyed here
+    delete lcblk;
+}
+
+// called with SurfaceFlinger::mStateLock as soon as the layer is entered
+// in the purgatory list
+void Layer::onRemoved()
+{
+    // wake up the condition
+    lcblk->setStatus(NO_INIT);
 }
 
 void Layer::destroy()
 {
-    for (size_t i=0 ; i<NUM_BUFFERS ; i++) {
-        if (mTextures[i].name != -1U) {
-            glDeleteTextures(1, &mTextures[i].name);
-            mTextures[i].name = -1U;
-        }
-        if (mTextures[i].image != EGL_NO_IMAGE_KHR) {
-            EGLDisplay dpy(mFlinger->graphicPlane(0).getEGLDisplay());
-            eglDestroyImageKHR(dpy, mTextures[i].image);
-            mTextures[i].image = EGL_NO_IMAGE_KHR;
-        }
-        Mutex::Autolock _l(mLock);
-        mBuffers[i].clear();
-        mWidth = mHeight = 0;
-    }
+    EGLDisplay dpy(mFlinger->graphicPlane(0).getEGLDisplay());
+    mBufferManager.destroy(dpy);
+
     mSurface.clear();
+
+    Mutex::Autolock _l(mLock);
+    mWidth = mHeight = 0;
 }
 
 sp<LayerBaseClient::Surface> Layer::createSurface() const
@@ -131,17 +139,13 @@ status_t Layer::setBuffers( uint32_t w, uint32_t h,
     int layerRedsize = info.getSize(PixelFormatInfo::INDEX_RED);
     mNeedsDithering = layerRedsize > displayRedSize;
 
-    for (size_t i=0 ; i<NUM_BUFFERS ; i++) {
-        mBuffers[i] = new GraphicBuffer();
-    }
     mSurface = new SurfaceLayer(mFlinger, clientIndex(), this);
     return NO_ERROR;
 }
 
 void Layer::reloadTexture(const Region& dirty)
 {
-    Mutex::Autolock _l(mLock);
-    sp<GraphicBuffer> buffer(getFrontBufferLocked());
+    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
@@ -149,37 +153,24 @@ void Layer::reloadTexture(const Region& dirty)
         return;
     }
 
-    const int index = mFrontBufferIndex;
-
-    // create the new texture name if needed
-    if (UNLIKELY(mTextures[index].name == -1U)) {
-        mTextures[index].name = createTexture();
-        mTextures[index].width = 0;
-        mTextures[index].height = 0;
-    }
-
 #ifdef EGL_ANDROID_image_native_buffer
     if (mFlags & DisplayHardware::DIRECT_TEXTURE) {
-        if (mTextures[index].dirty) {
-            if (initializeEglImage(buffer, &mTextures[index]) != NO_ERROR) {
-                // not sure what we can do here...
-                mFlags &= ~DisplayHardware::DIRECT_TEXTURE;
-                goto slowpath;
-            }
+        EGLDisplay dpy(mFlinger->graphicPlane(0).getEGLDisplay());
+        if (mBufferManager.initEglImage(dpy, buffer) != NO_ERROR) {
+            // not sure what we can do here...
+            mFlags &= ~DisplayHardware::DIRECT_TEXTURE;
+            goto slowpath;
         }
     } else
 #endif
     {
 slowpath:
-        for (size_t i=0 ; i<NUM_BUFFERS ; i++) {
-            mTextures[i].image = EGL_NO_IMAGE_KHR;
-        }
         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) {
-            loadTexture(&mTextures[0], dirty, t);
+            mBufferManager.loadTexture(dirty, t);
             buffer->unlock();
         }
     }
@@ -187,11 +178,8 @@ slowpath:
 
 void Layer::onDraw(const Region& clip) const
 {
-    int index = mFrontBufferIndex;
-    if (mTextures[index].image == EGL_NO_IMAGE_KHR)
-        index = 0;
-    GLuint textureName = mTextures[index].name;
-    if (UNLIKELY(textureName == -1LU)) {
+    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
@@ -217,7 +205,7 @@ void Layer::onDraw(const Region& clip) const
         }
         return;
     }
-    drawWithOpenGL(clip, mTextures[index]);
+    drawWithOpenGL(clip, tex);
 }
 
 sp<GraphicBuffer> Layer::requestBuffer(int index, int usage)
@@ -254,15 +242,7 @@ sp<GraphicBuffer> Layer::requestBuffer(int index, int usage)
         Mutex::Autolock _l(mLock);
         w = mWidth;
         h = mHeight;
-        buffer = mBuffers[index];
-        
-        // destroy() could have been called before we get here, we log it
-        // because it's uncommon, and the code below should handle it
-        LOGW_IF(buffer==0, 
-                "mBuffers[%d] is null (mWidth=%d, mHeight=%d)",
-                index, w, h);
-        
-        mBuffers[index].clear();
+        buffer = mBufferManager.detachBuffer(index);
     }
 
     const uint32_t effectiveUsage = getEffectiveUsage(usage);
@@ -290,10 +270,7 @@ sp<GraphicBuffer> Layer::requestBuffer(int index, int usage)
     if (err == NO_ERROR && buffer->handle != 0) {
         Mutex::Autolock _l(mLock);
         if (mWidth && mHeight) {
-            // and we have new buffer
-            mBuffers[index] = buffer;
-            // texture is now dirty...
-            mTextures[index].dirty = true;
+            mBufferManager.attachBuffer(index, buffer);
         } else {
             // oops we got killed while we were allocating the buffer
             buffer.clear();
@@ -338,13 +315,10 @@ uint32_t Layer::doTransaction(uint32_t flags)
         (front.requested_h != temp.requested_h)) {
         // 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), (%dx%d), (%dx%d)",
+                    "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),
-                    int(mBuffers[0]->getWidth()), int(mBuffers[0]->getHeight()),
-                    int(mBuffers[1]->getWidth()), int(mBuffers[1]->getHeight()));
+                    int(front.requested_w), int(front.requested_h));
 
         // we're being resized and there is a freeze display request,
         // acquire a freeze lock, so that the screen stays put
@@ -396,22 +370,25 @@ void Layer::setDrawingSize(uint32_t w, uint32_t h) {
 void Layer::lockPageFlip(bool& recomputeVisibleRegions)
 {
     ssize_t buf = lcblk->retireAndLock();
-    if (buf < NO_ERROR) {
-        //LOGW("nothing to retire (%s)", strerror(-buf));
-        // NOTE: here the buffer is locked because we will used 
+    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;
     }
 
-    // ouch, this really should never happen
-    if (uint32_t(buf)>=NUM_BUFFERS) {
+    if (buf < NO_ERROR) {
         LOGE("retireAndLock() buffer index (%d) out of range", buf);
         mPostedDirtyRegion.clear();
         return;
     }
 
     // we retired a buffer, which becomes the new front buffer
-    mFrontBufferIndex = buf;
+    if (mBufferManager.setActiveBufferIndex(buf) < NO_ERROR) {
+        LOGE("retireAndLock() buffer index (%d) out of range", buf);
+        mPostedDirtyRegion.clear();
+        return;
+    }
 
     // get the dirty region
     sp<GraphicBuffer> newFrontBuffer(getBuffer(buf));
@@ -503,10 +480,9 @@ void Layer::unlockPageFlip(
 
 void Layer::finishPageFlip()
 {
-    status_t err = lcblk->unlock( mFrontBufferIndex );
-    LOGE_IF(err!=NO_ERROR, 
-            "layer %p, buffer=%d wasn't locked!",
-            this, mFrontBufferIndex);
+    int buf = mBufferManager.getActiveBufferIndex();
+    status_t err = lcblk->unlock( buf );
+    LOGE_IF(err!=NO_ERROR, "layer %p, buffer=%d wasn't locked!", this, buf);
 }
 
 
@@ -543,6 +519,109 @@ void Layer::dump(String8& result, char* buffer, size_t SIZE) const
 
 // ---------------------------------------------------------------------------
 
+Layer::BufferManager::BufferManager(TextureManager& tm)
+    : mTextureManager(tm), mActiveBuffer(0), mFailover(false)
+{
+}
+
+size_t Layer::BufferManager::getBufferCount() const {
+    return NUM_BUFFERS;
+}
+
+// only for debugging
+sp<GraphicBuffer> Layer::BufferManager::getBuffer(size_t index) const {
+    return mBufferData[index].buffer;
+}
+
+status_t Layer::BufferManager::setActiveBufferIndex(size_t index) {
+    // TODO: need to validate 'index'
+    mActiveBuffer = index;
+    return NO_ERROR;
+}
+
+size_t Layer::BufferManager::getActiveBufferIndex() const {
+    return mActiveBuffer;
+}
+
+Texture Layer::BufferManager::getActiveTexture() const {
+    return mFailover ? mFailoverTexture : mBufferData[mActiveBuffer].texture;
+}
+
+sp<GraphicBuffer> Layer::BufferManager::getActiveBuffer() const {
+    Mutex::Autolock _l(mLock);
+    return mBufferData[mActiveBuffer].buffer;
+}
+
+sp<GraphicBuffer> Layer::BufferManager::detachBuffer(size_t index)
+{
+    sp<GraphicBuffer> buffer;
+    Mutex::Autolock _l(mLock);
+    buffer = mBufferData[index].buffer;
+    mBufferData[index].buffer = 0;
+    return buffer;
+}
+
+status_t Layer::BufferManager::attachBuffer(size_t index,
+        const sp<GraphicBuffer>& buffer)
+{
+    Mutex::Autolock _l(mLock);
+    mBufferData[index].buffer = buffer;
+    mBufferData[index].texture.dirty = true;
+    return NO_ERROR;
+}
+
+status_t Layer::BufferManager::destroyTexture(Texture* 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;
+}
+
+status_t Layer::BufferManager::destroy(EGLDisplay dpy)
+{
+    Mutex::Autolock _l(mLock);
+    for (size_t i=0 ; i<NUM_BUFFERS ; i++) {
+        destroyTexture(&mBufferData[i].texture, dpy);
+        mBufferData[i].buffer = 0;
+    }
+    destroyTexture(&mFailoverTexture, dpy);
+    return NO_ERROR;
+}
+
+status_t Layer::BufferManager::initEglImage(EGLDisplay dpy,
+        const sp<GraphicBuffer>& buffer)
+{
+    size_t index = mActiveBuffer;
+    Texture& texture(mBufferData[index].texture);
+    status_t 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;
+        for (size_t i=0 ; i<NUM_BUFFERS ; i++) {
+            destroyTexture(&mBufferData[i].texture, dpy);
+        }
+    }
+    return err;
+}
+
+status_t Layer::BufferManager::loadTexture(
+        const Region& dirty, const GGLSurface& t)
+{
+    return mTextureManager.loadTexture(&mFailoverTexture, dirty, t);
+}
+
+// ---------------------------------------------------------------------------
+
 Layer::SurfaceLayer::SurfaceLayer(const sp<SurfaceFlinger>& flinger,
         SurfaceID id, const sp<Layer>& owner)
     : Surface(flinger, id, owner->getIdentity(), owner)
@@ -558,11 +637,7 @@ sp<GraphicBuffer> Layer::SurfaceLayer::requestBuffer(int index, int usage)
     sp<GraphicBuffer> buffer;
     sp<Layer> owner(getOwner());
     if (owner != 0) {
-        LOGE_IF(uint32_t(index)>=NUM_BUFFERS,
-                "getBuffer() index (%d) out of range", index);
-        if (uint32_t(index) < NUM_BUFFERS) {
-            buffer = owner->requestBuffer(index, usage);
-        }
+        buffer = owner->requestBuffer(index, usage);
     }
     return buffer;
 }
diff --git a/libs/surfaceflinger/Layer.h b/libs/surfaceflinger/Layer.h
index f0581c9..26fb6c6 100644
--- a/libs/surfaceflinger/Layer.h
+++ b/libs/surfaceflinger/Layer.h
@@ -31,6 +31,7 @@
 
 #include "LayerBase.h"
 #include "Transform.h"
+#include "TextureManager.h"
 
 namespace android {
 
@@ -41,11 +42,13 @@ class FreezeLock;
 
 // ---------------------------------------------------------------------------
 
-const size_t NUM_BUFFERS = 2;
-
 class Layer : public LayerBaseClient
 {
-public:    
+public:
+    // lcblk is (almost) only accessed from the main SF thread, in the places
+    // where it's not, a reference to Client must be held
+    SharedBufferServer*     lcblk;
+
                  Layer(SurfaceFlinger* flinger, DisplayID display,
                          const sp<Client>& client, int32_t i);
 
@@ -66,15 +69,14 @@ public:
     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 mBuffers[i]; }
+    inline sp<GraphicBuffer> getBuffer(int i) const { return mBufferManager.getBuffer(i); }
     // only for debugging
     inline const sp<FreezeLock>&  getFreezeLock() const { return mFreezeLock; }
     // only for debugging
     inline PixelFormat pixelFormat() const { return mFormat; }
-    // only for debugging
-    inline int getFrontBufferIndex() const { return mFrontBufferIndex; }
 
     virtual const char* getTypeId() const { return "Layer"; }
 
@@ -82,10 +84,6 @@ protected:
     virtual void dump(String8& result, char* scratch, size_t size) const;
 
 private:
-    inline sp<GraphicBuffer> getFrontBufferLocked() {
-        return mBuffers[mFrontBufferIndex];
-    }
- 
     void reloadTexture(const Region& dirty);
 
     uint32_t getEffectiveUsage(uint32_t usage) const;
@@ -115,14 +113,64 @@ private:
             Region          mPostedDirtyRegion;
             sp<FreezeLock>  mFreezeLock;
             PixelFormat     mFormat;
-            
-            // protected by mLock
-            sp<GraphicBuffer> mBuffers[NUM_BUFFERS];
-            Texture         mTextures[NUM_BUFFERS];
-            uint32_t        mWidth;
-            uint32_t        mHeight;
-            
-   mutable Mutex mLock;
+
+            class BufferManager {
+                static const size_t NUM_BUFFERS = 2;
+                struct BufferData {
+                    sp<GraphicBuffer>   buffer;
+                    Texture             texture;
+                };
+                mutable Mutex mLock;
+                BufferData          mBufferData[NUM_BUFFERS];
+                Texture             mFailoverTexture;
+                TextureManager&     mTextureManager;
+                ssize_t             mActiveBuffer;
+                bool                mFailover;
+                static status_t destroyTexture(Texture* tex, EGLDisplay dpy);
+
+            public:
+                BufferManager(TextureManager& tm);
+
+                size_t getBufferCount() const;
+
+                // detach/attach buffer from/to given index
+                sp<GraphicBuffer> detachBuffer(size_t index);
+                status_t attachBuffer(size_t index, const sp<GraphicBuffer>& buffer);
+
+                // ----------------------------------------------
+                // 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;
+            };
+
+            TextureManager mTextureManager;
+            BufferManager mBufferManager;
+
+            mutable Mutex mLock;
+            uint32_t    mWidth;
+            uint32_t    mHeight;
 };
 
 // ---------------------------------------------------------------------------
diff --git a/libs/surfaceflinger/LayerBase.cpp b/libs/surfaceflinger/LayerBase.cpp
index 48b0e47..7d8d43f 100644
--- a/libs/surfaceflinger/LayerBase.cpp
+++ b/libs/surfaceflinger/LayerBase.cpp
@@ -32,6 +32,7 @@
 #include "LayerBase.h"
 #include "SurfaceFlinger.h"
 #include "DisplayHardware/DisplayHardware.h"
+#include "TextureManager.h"
 
 
 namespace android {
@@ -340,18 +341,6 @@ void LayerBase::draw(const Region& inClip) const
     */
 }
 
-GLuint LayerBase::createTexture() const
-{
-    GLuint textureName = -1;
-    glGenTextures(1, &textureName);
-    glBindTexture(GL_TEXTURE_2D, textureName);
-    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-    return textureName;
-}
-
 void LayerBase::clearWithOpenGL(const Region& clip, GLclampx red,
                                 GLclampx green, GLclampx blue,
                                 GLclampx alpha) const
@@ -492,187 +481,6 @@ void LayerBase::validateTexture(GLint textureName) const
     }
 }
 
-bool LayerBase::isSupportedYuvFormat(int format) const
-{
-    switch (format) {
-        case HAL_PIXEL_FORMAT_YCbCr_422_SP:
-        case HAL_PIXEL_FORMAT_YCbCr_420_SP:
-        case HAL_PIXEL_FORMAT_YCbCr_422_P:
-        case HAL_PIXEL_FORMAT_YCbCr_420_P:
-        case HAL_PIXEL_FORMAT_YCbCr_422_I:
-        case HAL_PIXEL_FORMAT_YCbCr_420_I:
-        case HAL_PIXEL_FORMAT_YCrCb_420_SP:
-            return true;
-    }
-    return false;
-}
-
-void LayerBase::loadTexture(Texture* texture, 
-        const Region& dirty, const GGLSurface& t) const
-{
-    if (texture->name == -1U) {
-        // uh?
-        return;
-    }
-
-    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 (!(mFlags & DisplayHardware::NPOT_EXTENSION)) {
-        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("layer %p, texture=%d, using format %d, which is not "
-                 "supported by the GL", this, 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);
-        }
-    }
-}
-
-status_t LayerBase::initializeEglImage(
-        const sp<GraphicBuffer>& buffer, Texture* texture)
-{
-    status_t err = NO_ERROR;
-
-    // we need to recreate the texture
-    EGLDisplay dpy(mFlinger->graphicPlane(0).getEGLDisplay());
-
-    // free the previous image
-    if (texture->image != EGL_NO_IMAGE_KHR) {
-        eglDestroyImageKHR(dpy, texture->image);
-        texture->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
-    };
-    texture->image = eglCreateImageKHR(
-            dpy, EGL_NO_CONTEXT, EGL_NATIVE_BUFFER_ANDROID,
-            (EGLClientBuffer)clientBuf, attrs);
-
-    if (texture->image != EGL_NO_IMAGE_KHR) {
-        glBindTexture(GL_TEXTURE_2D, texture->name);
-        glEGLImageTargetTexture2DOES(GL_TEXTURE_2D,
-                (GLeglImageOES)texture->image);
-        GLint error = glGetError();
-        if (UNLIKELY(error != GL_NO_ERROR)) {
-            LOGE("layer=%p, glEGLImageTargetTexture2DOES(%p) "
-                 "failed err=0x%04x",
-                 this, texture->image, error);
-            err = INVALID_OPERATION;
-        } else {
-            // Everything went okay!
-            texture->NPOTAdjust = false;
-            texture->dirty  = false;
-            texture->width  = clientBuf->width;
-            texture->height = clientBuf->height;
-        }
-    } else {
-        LOGE("layer=%p, eglCreateImageKHR() failed. err=0x%4x",
-                this, eglGetError());
-        err = INVALID_OPERATION;
-    }
-    return err;
-}
-
 void LayerBase::dump(String8& result, char* buffer, size_t SIZE) const
 {
     const Layer::State& s(drawingState());
@@ -696,12 +504,9 @@ int32_t LayerBaseClient::sIdentity = 0;
 
 LayerBaseClient::LayerBaseClient(SurfaceFlinger* flinger, DisplayID display,
         const sp<Client>& client, int32_t i)
-    : LayerBase(flinger, display), lcblk(NULL), client(client), mIndex(i),
+    : LayerBase(flinger, display), client(client), mIndex(i),
       mIdentity(uint32_t(android_atomic_inc(&sIdentity)))
 {
-    lcblk = new SharedBufferServer(
-            client->ctrlblk, i, NUM_BUFFERS,
-            mIdentity);
 }
 
 void LayerBaseClient::onFirstRef()
@@ -718,7 +523,6 @@ LayerBaseClient::~LayerBaseClient()
     if (client != 0) {
         client->free(mIndex);
     }
-    delete lcblk;
 }
 
 ssize_t LayerBaseClient::serverIndex() const
@@ -748,14 +552,6 @@ sp<LayerBaseClient::Surface> LayerBaseClient::createSurface() const
             const_cast<LayerBaseClient *>(this));
 }
 
-// called with SurfaceFlinger::mStateLock as soon as the layer is entered
-// in the purgatory list
-void LayerBaseClient::onRemoved()
-{
-    // wake up the condition
-    lcblk->setStatus(NO_INIT);
-}
-
 void LayerBaseClient::dump(String8& result, char* buffer, size_t SIZE) const
 {
     LayerBase::dump(result, buffer, SIZE);
diff --git a/libs/surfaceflinger/LayerBase.h b/libs/surfaceflinger/LayerBase.h
index 219a53c..c500dcf 100644
--- a/libs/surfaceflinger/LayerBase.h
+++ b/libs/surfaceflinger/LayerBase.h
@@ -46,6 +46,7 @@ class Client;
 class GraphicBuffer;
 class GraphicPlane;
 class SurfaceFlinger;
+class Texture;
 
 // ---------------------------------------------------------------------------
 
@@ -221,35 +222,10 @@ protected:
     const GraphicPlane& graphicPlane(int dpy) const;
           GraphicPlane& graphicPlane(int dpy);
 
-          GLuint createTexture() const;
-    
-          struct Texture {
-              Texture() : name(-1U), width(0), height(0),
-                  image(EGL_NO_IMAGE_KHR), transform(0), 
-                  NPOTAdjust(false), dirty(true) { }
-              GLuint        name;
-              GLuint        width;
-              GLuint        height;
-              GLuint        potWidth;
-              GLuint        potHeight;
-              GLfloat       wScale;
-              GLfloat       hScale;
-              EGLImageKHR   image;
-              uint32_t      transform;
-              bool          NPOTAdjust;
-              bool          dirty;
-          };
-
           void clearWithOpenGL(const Region& clip, GLclampx r, GLclampx g,
                                GLclampx b, GLclampx alpha) const;
           void clearWithOpenGL(const Region& clip) const;
           void drawWithOpenGL(const Region& clip, const Texture& texture) const;
-          void loadTexture(Texture* texture, 
-                  const Region& dirty, const GGLSurface& t) const;
-          status_t initializeEglImage(
-                  const sp<GraphicBuffer>& buffer, Texture* texture);
-
-          bool isSupportedYuvFormat(int format) const;
           
                 sp<SurfaceFlinger> mFlinger;
                 uint32_t        mFlags;
@@ -294,10 +270,6 @@ class LayerBaseClient : public LayerBase
 public:
     class Surface;
 
-    // lcblk is (almost) only accessed from the main SF thread, in the places
-    // where it's not, a reference to Client must be held
-    SharedBufferServer*     lcblk;
-
     LayerBaseClient(SurfaceFlinger* flinger, DisplayID display, 
             const sp<Client>& client, int32_t i);
     virtual ~LayerBaseClient();
@@ -311,7 +283,6 @@ public:
             sp<Surface> getSurface();
     virtual sp<Surface> createSurface() const;
     virtual ssize_t     serverIndex() const;
-    virtual void        onRemoved();
     virtual const char* getTypeId() const { return "LayerBaseClient"; }
 
     class Surface : public BnSurface 
diff --git a/libs/surfaceflinger/LayerBuffer.cpp b/libs/surfaceflinger/LayerBuffer.cpp
index 0041a0f..dfcc80f 100644
--- a/libs/surfaceflinger/LayerBuffer.cpp
+++ b/libs/surfaceflinger/LayerBuffer.cpp
@@ -328,7 +328,7 @@ bool LayerBuffer::Source::transformed() const {
 LayerBuffer::BufferSource::BufferSource(LayerBuffer& layer,
         const ISurface::BufferHeap& buffers)
     : Source(layer), mStatus(NO_ERROR), mBufferSize(0),
-      mUseEGLImageDirectly(true)
+      mTextureManager(layer.mFlags)
 {
     if (buffers.heap == NULL) {
         // this is allowed, but in this case, it is illegal to receive
@@ -460,35 +460,10 @@ void LayerBuffer::BufferSource::onDraw(const Region& clip) const
     NativeBuffer src(ourBuffer->getBuffer());
     const Rect transformedBounds(mLayer.getTransformedBounds());
 
-    if (UNLIKELY(mTexture.name == -1LU)) {
-        mTexture.name = mLayer.createTexture();
-    }
-
 #if defined(EGL_ANDROID_image_native_buffer)
     if (mLayer.mFlags & DisplayHardware::DIRECT_TEXTURE) {
         err = INVALID_OPERATION;
         if (ourBuffer->supportsCopybit()) {
-
-            // there are constraints on buffers used by the GPU and these may not
-            // be honored here. We need to change the API so the buffers
-            // are allocated with gralloc. For now disable this code-path
-#if 0
-            // First, try to use the buffer as an EGLImage directly
-            if (mUseEGLImageDirectly) {
-                // NOTE: Assume the buffer is allocated with the proper USAGE flags
-
-                sp<GraphicBuffer> buffer = new  GraphicBuffer(
-                        src.img.w, src.img.h, src.img.format,
-                        GraphicBuffer::USAGE_HW_TEXTURE,
-                        src.img.w, src.img.handle, false);
-
-                err = mLayer.initializeEglImage(buffer, &mTexture);
-                if (err != NO_ERROR) {
-                    mUseEGLImageDirectly = false;
-                }
-            }
-#endif
-
             copybit_device_t* copybit = mLayer.mBlitEngine;
             if (copybit && err != NO_ERROR) {
                 // create our EGLImageKHR the first time
@@ -525,7 +500,7 @@ void LayerBuffer::BufferSource::onDraw(const Region& clip) const
         t.format = src.img.format;
         t.data = (GGLubyte*)src.img.base;
         const Region dirty(Rect(t.width, t.height));
-        mLayer.loadTexture(&mTexture, dirty, t);
+        mTextureManager.loadTexture(&mTexture, dirty, t);
     }
 
     mTexture.transform = mBufferHeap.transform;
@@ -591,7 +566,8 @@ status_t LayerBuffer::BufferSource::initTempBuffer() const
         dst.crop.r = w;
         dst.crop.b = h;
 
-        err = mLayer.initializeEglImage(buffer, &mTexture);
+        EGLDisplay dpy(mLayer.mFlinger->graphicPlane(0).getEGLDisplay());
+        err = mTextureManager.initEglImage(&mTexture, dpy, buffer);
     }
 
     return err;
@@ -607,7 +583,6 @@ void LayerBuffer::BufferSource::clearTempBufferImage() const
     glDeleteTextures(1, &mTexture.name);
     Texture defaultTexture;
     mTexture = defaultTexture;
-    mTexture.name = mLayer.createTexture();
 }
 
 // ---------------------------------------------------------------------------
diff --git a/libs/surfaceflinger/LayerBuffer.h b/libs/surfaceflinger/LayerBuffer.h
index 243cc43..869c74f 100644
--- a/libs/surfaceflinger/LayerBuffer.h
+++ b/libs/surfaceflinger/LayerBuffer.h
@@ -21,6 +21,7 @@
 #include <sys/types.h>
 
 #include "LayerBase.h"
+#include "TextureManager.h"
 
 struct copybit_device_t;
 
@@ -139,9 +140,9 @@ private:
         status_t                        mStatus;
         ISurface::BufferHeap            mBufferHeap;
         size_t                          mBufferSize;
-        mutable LayerBase::Texture      mTexture;
+        mutable Texture                 mTexture;
         mutable NativeBuffer            mTempBuffer;
-        mutable bool                    mUseEGLImageDirectly;
+        mutable TextureManager          mTextureManager;
     };
     
     class OverlaySource : public Source {
diff --git a/libs/surfaceflinger/TextureManager.cpp b/libs/surfaceflinger/TextureManager.cpp
new file mode 100644
index 0000000..e5d5302
--- /dev/null
+++ b/libs/surfaceflinger/TextureManager.cpp
@@ -0,0 +1,242 @@
+/*
+ * 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 "TextureManager.h"
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+TextureManager::TextureManager(uint32_t flags)
+    : mFlags(flags)
+{
+}
+
+GLuint TextureManager::createTexture()
+{
+    GLuint textureName = -1;
+    glGenTextures(1, &textureName);
+    glBindTexture(GL_TEXTURE_2D, textureName);
+    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    return textureName;
+}
+
+bool TextureManager::isSupportedYuvFormat(int format)
+{
+    switch (format) {
+        case HAL_PIXEL_FORMAT_YCbCr_422_SP:
+        case HAL_PIXEL_FORMAT_YCbCr_420_SP:
+        case HAL_PIXEL_FORMAT_YCbCr_422_P:
+        case HAL_PIXEL_FORMAT_YCbCr_420_P:
+        case HAL_PIXEL_FORMAT_YCbCr_422_I:
+        case HAL_PIXEL_FORMAT_YCbCr_420_I:
+        case HAL_PIXEL_FORMAT_YCrCb_420_SP:
+            return true;
+    }
+    return false;
+}
+
+status_t TextureManager::initEglImage(Texture* texture,
+        EGLDisplay dpy, const sp<GraphicBuffer>& buffer)
+{
+    status_t err = NO_ERROR;
+    if (!texture->dirty) return err;
+
+    // free the previous image
+    if (texture->image != EGL_NO_IMAGE_KHR) {
+        eglDestroyImageKHR(dpy, texture->image);
+        texture->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
+    };
+    texture->image = eglCreateImageKHR(
+            dpy, EGL_NO_CONTEXT, EGL_NATIVE_BUFFER_ANDROID,
+            (EGLClientBuffer)clientBuf, attrs);
+
+    if (texture->image != EGL_NO_IMAGE_KHR) {
+        if (texture->name == -1UL) {
+            texture->name = createTexture();
+            texture->width = 0;
+            texture->height = 0;
+        }
+        glBindTexture(GL_TEXTURE_2D, texture->name);
+        glEGLImageTargetTexture2DOES(GL_TEXTURE_2D,
+                (GLeglImageOES)texture->image);
+        GLint error = glGetError();
+        if (error != GL_NO_ERROR) {
+            LOGE("glEGLImageTargetTexture2DOES(%p) failed err=0x%04x",
+                    texture->image, error);
+            err = INVALID_OPERATION;
+        } else {
+            // Everything went okay!
+            texture->NPOTAdjust = false;
+            texture->dirty  = false;
+            texture->width  = clientBuf->width;
+            texture->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) {
+        texture->name = createTexture();
+        texture->width = 0;
+        texture->height = 0;
+    }
+
+    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 (!(mFlags & DisplayHardware::NPOT_EXTENSION)) {
+        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;
+}
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
diff --git a/libs/surfaceflinger/TextureManager.h b/libs/surfaceflinger/TextureManager.h
new file mode 100644
index 0000000..90cb62b
--- /dev/null
+++ b/libs/surfaceflinger/TextureManager.h
@@ -0,0 +1,79 @@
+/*
+ * 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 GraphicBuffer;
+
+// ---------------------------------------------------------------------------
+
+struct Texture {
+    Texture() : name(-1U), width(0), height(0),
+        image(EGL_NO_IMAGE_KHR), transform(0),
+        NPOTAdjust(false), dirty(true) { }
+    GLuint        name;
+    GLuint        width;
+    GLuint        height;
+    GLuint        potWidth;
+    GLuint        potHeight;
+    GLfloat       wScale;
+    GLfloat       hScale;
+    EGLImageKHR   image;
+    uint32_t      transform;
+    bool          NPOTAdjust;
+    bool          dirty;
+};
+
+// ---------------------------------------------------------------------------
+
+class TextureManager {
+    uint32_t mFlags;
+    GLuint createTexture();
+    static bool isSupportedYuvFormat(int format);
+public:
+
+    TextureManager(uint32_t flags);
+
+    // 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(Texture* texture,
+            EGLDisplay dpy, const sp<GraphicBuffer>& buffer);
+};
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
+
+#endif // ANDROID_TEXTURE_MANAGER_H