added two EGL helpers for selecting a config matching a certain pixelformat or native window type

3 files changed, 112 insertions, 26 deletions

diff --git a/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp b/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
index f0615f0..002a3ab 100644
--- a/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
+++ b/libs/surfaceflinger/DisplayHardware/DisplayHardware.cpp
@@ -26,6 +26,7 @@
 
 #include <ui/PixelFormat.h>
 #include <ui/FramebufferNativeWindow.h>
+#include <ui/EGLUtils.h>
 
 #include <GLES/gl.h>
 #include <EGL/egl.h>
@@ -144,32 +145,11 @@ void DisplayHardware::init(uint32_t dpy)
     eglInitialize(display, NULL, NULL);
     eglGetConfigs(display, NULL, 0, &numConfigs);
 
-    // Get all the "potential match" configs...
-    EGLConfig* const configs = new EGLConfig[numConfigs];
-    eglChooseConfig(display, attribs, configs, numConfigs, &n);
-    LOGE_IF(n<=0, "no EGLConfig available!");
-    EGLConfig config = configs[0];
-    if (n > 1) {
-        // if there is more than one candidate, go through the list
-        // and pick one that matches our framebuffer format
-        int fbSzA = fbFormatInfo.getSize(PixelFormatInfo::INDEX_ALPHA);
-        int fbSzR = fbFormatInfo.getSize(PixelFormatInfo::INDEX_RED);
-        int fbSzG = fbFormatInfo.getSize(PixelFormatInfo::INDEX_GREEN);
-        int fbSzB = fbFormatInfo.getSize(PixelFormatInfo::INDEX_BLUE); 
-        for (int i=0 ; i<n ; i++) {
-            EGLint r,g,b,a;
-            eglGetConfigAttrib(display, configs[i], EGL_RED_SIZE,   &r);
-            eglGetConfigAttrib(display, configs[i], EGL_GREEN_SIZE, &g);
-            eglGetConfigAttrib(display, configs[i], EGL_BLUE_SIZE,  &b);
-            eglGetConfigAttrib(display, configs[i], EGL_ALPHA_SIZE, &a);
-            if (fbSzA == a && fbSzR == r && fbSzG == g && fbSzB  == b) {
-                config = configs[i];
-                break;
-            }
-        }
-    }
-    delete [] configs;
-
+    EGLConfig config;
+    status_t err = EGLUtils::selectConfigForPixelFormat(
+            display, attribs, fbDev->format, &config);
+    LOGE_IF(err, "couldn't find an EGLConfig matching the screen format");
+    
     /*
      * Gather EGL extensions
      */
diff --git a/libs/ui/Android.mk b/libs/ui/Android.mk
index 49939ca..93c7263 100644
--- a/libs/ui/Android.mk
+++ b/libs/ui/Android.mk
@@ -5,6 +5,7 @@ LOCAL_SRC_FILES:= \
 	BufferMapper.cpp \
 	Camera.cpp \
 	CameraParameters.cpp \
+	EGLUtils.cpp \
 	EventHub.cpp \
 	EventRecurrence.cpp \
 	FramebufferNativeWindow.cpp \
@@ -29,6 +30,7 @@ LOCAL_SRC_FILES:= \
 LOCAL_SHARED_LIBRARIES := \
 	libcutils \
 	libutils \
+	libEGL \
 	libbinder \
 	libpixelflinger \
 	libhardware \
diff --git a/libs/ui/EGLUtils.cpp b/libs/ui/EGLUtils.cpp
new file mode 100644
index 0000000..9b2839d
--- /dev/null
+++ b/libs/ui/EGLUtils.cpp
@@ -0,0 +1,104 @@
+/*
+ * 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.
+ */
+
+
+#define LOG_TAG "EGLUtils"
+
+#include <utils/Errors.h>
+
+#include <ui/EGLUtils.h>
+
+#include <EGL/egl.h>
+
+#include <private/ui/android_natives_priv.h>
+
+// ----------------------------------------------------------------------------
+namespace android {
+// ----------------------------------------------------------------------------
+
+status_t EGLUtils::selectConfigForPixelFormat(
+        EGLDisplay dpy,
+        EGLint const* attrs,
+        PixelFormat format,
+        EGLConfig* outConfig)
+{
+    EGLint numConfigs = -1, n=0;
+
+    if (outConfig == NULL)
+        return BAD_VALUE;
+    
+    int err;
+    PixelFormatInfo fbFormatInfo;
+    if ((err = getPixelFormatInfo(PixelFormat(format), &fbFormatInfo)) < 0) {
+        return err;
+    }
+
+    // Get all the "potential match" configs...
+    if (eglGetConfigs(dpy, NULL, 0, &numConfigs) == EGL_FALSE)
+        return BAD_VALUE;
+
+    EGLConfig* const configs = (EGLConfig*)malloc(sizeof(EGLConfig)*numConfigs);
+    if (eglChooseConfig(dpy, attrs, configs, numConfigs, &n) == EGL_FALSE) {
+        free(configs);
+        return BAD_VALUE;
+    }
+
+    const int fbSzA = fbFormatInfo.getSize(PixelFormatInfo::INDEX_ALPHA);
+    const int fbSzR = fbFormatInfo.getSize(PixelFormatInfo::INDEX_RED);
+    const int fbSzG = fbFormatInfo.getSize(PixelFormatInfo::INDEX_GREEN);
+    const int fbSzB = fbFormatInfo.getSize(PixelFormatInfo::INDEX_BLUE); 
+    
+    EGLConfig config = NULL;
+    for (int i=0 ; i<n ; i++) {
+        EGLint r,g,b,a;
+        eglGetConfigAttrib(dpy, configs[i], EGL_RED_SIZE,   &r);
+        eglGetConfigAttrib(dpy, configs[i], EGL_GREEN_SIZE, &g);
+        eglGetConfigAttrib(dpy, configs[i], EGL_BLUE_SIZE,  &b);
+        eglGetConfigAttrib(dpy, configs[i], EGL_ALPHA_SIZE, &a);
+        if (fbSzA == a && fbSzR == r && fbSzG == g && fbSzB  == b) {
+            config = configs[i];
+            break;
+        }
+    }
+
+    free(configs);
+    
+    if (config) {
+        *outConfig = config;
+        return NO_ERROR;
+    }
+
+    return NAME_NOT_FOUND;
+}
+
+status_t EGLUtils::selectConfigForNativeWindow(
+        EGLDisplay dpy,
+        EGLint const* attrs,
+        EGLNativeWindowType window,
+        EGLConfig* outConfig)
+{
+    int err;
+    int format;
+    if ((err = window->query(window, NATIVE_WINDOW_FORMAT, &format)) < 0) {
+        return err;
+    }
+
+    return selectConfigForPixelFormat(dpy, attrs, format, outConfig);
+}
+
+// ----------------------------------------------------------------------------
+}; // namespace android
+// ----------------------------------------------------------------------------