Add RGB565 Texture readback support in gl_helper

content/browser/renderer_host/render_widget_host_view_android.cc

Index: content/browser/renderer_host/render_widget_host_view_android.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index 3df0b11d6b48905b6221c13a58c9bae0d1a4a0e5..1cad28aef2db7959b586e970a11c5102808a4fbc 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -574,7 +574,6 @@ void RenderWidgetHostViewAndroid::CopyFromCompositingSurface(
     callback.Run(false, SkBitmap());
     return;
   }
-
   const gfx::Display& display =
       gfx::Screen::GetNativeScreen()->GetPrimaryDisplay();
   float device_scale_factor = display.device_scale_factor();
@@ -590,7 +589,8 @@ void RenderWidgetHostViewAndroid::CopyFromCompositingSurface(
     SynchronousCopyContents(src_subrect_in_pixel, dst_size_in_pixel, callback);
     return;
   }
-
+  //Support format either  for ARGB8888 and RGB565.
+  bool readback_config_rgb565 = content_view_core_->IsReadBackConfig565();
   scoped_ptr<cc::CopyOutputRequest> request;
   if (src_subrect_in_pixel.size() == dst_size_in_pixel) {
       request = cc::CopyOutputRequest::CreateBitmapRequest(base::Bind(
@@ -601,6 +601,7 @@ void RenderWidgetHostViewAndroid::CopyFromCompositingSurface(
       request = cc::CopyOutputRequest::CreateRequest(base::Bind(
           &RenderWidgetHostViewAndroid::PrepareTextureCopyOutputResult,
           dst_size_in_pixel,
+          readback_config_rgb565,
           callback));
   }
   request->set_area(src_subrect_in_pixel);
@@ -1295,6 +1296,7 @@ void RenderWidgetHostViewAndroid::OnLostResources() {
 // static
 void RenderWidgetHostViewAndroid::PrepareTextureCopyOutputResult(
     const gfx::Size& dst_size_in_pixel,
+    bool readback_config_rgb565,
     const base::Callback<void(bool, const SkBitmap&)>& callback,
     scoped_ptr<cc::CopyOutputResult> result) {
   DCHECK(result->HasTexture());
@@ -1305,9 +1307,16 @@ void RenderWidgetHostViewAndroid::PrepareTextureCopyOutputResult(
     return;
 
   scoped_ptr<SkBitmap> bitmap(new SkBitmap);
-  bitmap->setConfig(SkBitmap::kARGB_8888_Config,
+  if(readback_config_rgb565){
+     bitmap->setConfig(SkBitmap::kRGB_565_Config,
+                    dst_size_in_pixel.width(), dst_size_in_pixel.height(),
+                    0, kOpaque_SkAlphaType);
+  }
+  else{
+     bitmap->setConfig(SkBitmap::kARGB_8888_Config,
                     dst_size_in_pixel.width(), dst_size_in_pixel.height(),
                     0, kOpaque_SkAlphaType);
+  }
   if (!bitmap->allocPixels())
     return;
 
@@ -1337,6 +1346,7 @@ void RenderWidgetHostViewAndroid::PrepareTextureCopyOutputResult(
       gfx::Rect(result->size()),
       dst_size_in_pixel,
       pixels,
+      readback_config_rgb565,
       base::Bind(&CopyFromCompositingSurfaceFinished,
                  callback,
                  base::Passed(&release_callback),