Implement GLHelperReadbackSupport for GLHelper usage.

content/browser/renderer_host/render_widget_host_view_android.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_android.h"
 
 #include <android/bitmap.h>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 607 matching lines @@
 void RenderWidgetHostViewAndroid::SetBackground(const SkBitmap& background) {
   RenderWidgetHostViewBase::SetBackground(background);
   host_->Send(new ViewMsg_SetBackground(host_->GetRoutingID(), background));
 }
 
 void RenderWidgetHostViewAndroid::CopyFromCompositingSurface(
     const gfx::Rect& src_subrect,
     const gfx::Size& dst_size,
     const base::Callback<void(bool, const SkBitmap&)>& callback,
     const SkBitmap::Config bitmap_config) {
-  // Only ARGB888 and RGB565 supported as of now.
-  bool format_support = ((bitmap_config == SkBitmap::kRGB_565_Config) ||
-                         (bitmap_config == SkBitmap::kARGB_8888_Config));
-  if (!format_support) {
-    DCHECK(format_support);
+
+  if (!IsReadBackConfigSupported(bitmap_config)) {
     callback.Run(false, SkBitmap());
     return;
   }
   base::TimeTicks start_time = base::TimeTicks::Now();
   if (!using_synchronous_compositor_ && !IsSurfaceAvailableForCopy()) {
     callback.Run(false, SkBitmap());
     return;
   }
-  ImageTransportFactoryAndroid* factory =
-      ImageTransportFactoryAndroid::GetInstance();
-  GLHelper* gl_helper = factory->GetGLHelper();
-  if (!gl_helper)
-    return;
-  bool check_rgb565_support = gl_helper->CanUseRgb565Readback();
-  if ((bitmap_config == SkBitmap::kRGB_565_Config) &&
-      !check_rgb565_support) {
-    LOG(ERROR) << "Readbackformat rgb565  not supported";
-    callback.Run(false, SkBitmap());
-    return;
-  }
   const gfx::Display& display =
       gfx::Screen::GetNativeScreen()->GetPrimaryDisplay();
   float device_scale_factor = display.device_scale_factor();
   gfx::Size dst_size_in_pixel =
       ConvertRectToPixel(device_scale_factor, gfx::Rect(dst_size)).size();
   gfx::Rect src_subrect_in_pixel =
       ConvertRectToPixel(device_scale_factor, src_subrect);
 
   if (using_synchronous_compositor_) {
     SynchronousCopyContents(src_subrect_in_pixel, dst_size_in_pixel, callback,
@@ skipping 743 matching lines @@
   bitmap->setConfig(bitmap_config,
                     dst_size_in_pixel.width(),
                     dst_size_in_pixel.height(),
                     0, kOpaque_SkAlphaType);
   if (!bitmap->allocPixels())
     return;
 
   ImageTransportFactoryAndroid* factory =
       ImageTransportFactoryAndroid::GetInstance();
   GLHelper* gl_helper = factory->GetGLHelper();
+
   if (!gl_helper)
     return;
 
   scoped_ptr<SkAutoLockPixels> bitmap_pixels_lock(
       new SkAutoLockPixels(*bitmap));
   uint8* pixels = static_cast<uint8*>(bitmap->getPixels());
 
   cc::TextureMailbox texture_mailbox;
   scoped_ptr<cc::SingleReleaseCallback> release_callback;
   result->TakeTexture(&texture_mailbox, &release_callback);
@@ skipping 46 matching lines @@
   DCHECK_EQ(source->width(), dst_size_in_pixel.width());
   DCHECK_EQ(source->height(), dst_size_in_pixel.height());
 
   ignore_result(scoped_callback_runner.Release());
   UMA_HISTOGRAM_TIMES(kAsyncReadBackString,
                       base::TimeTicks::Now() - start_time);
 
   callback.Run(true, *source);
 }
 
+bool RenderWidgetHostViewAndroid::IsReadBackConfigSupported(
+    const SkBitmap::Config& bitmap_config) {

[vivekg, 2014/02/20 00:53:31]

nit: As SkBitmap::Config is an enum, pass it by value as is done in [1]

bool IsReadbackConfigSupported(SkBitmap::Config bitmap_config) here and all
other applicable places.

[1]
https://code.google.com/p/chromium/codesearch#search/&q=%5C(.*SkBitmap::Confi...

[sivag, 2014/02/21 11:40:51]

Done.

+  ImageTransportFactoryAndroid* factory =
+      ImageTransportFactoryAndroid::GetInstance();
+  GLHelper* gl_helper = factory->GetGLHelper();
+  if (!gl_helper)
+    return false;
+  return gl_helper->IsReadBackConfigSupported(bitmap_config);
+}
+
 // static
 void RenderWidgetHostViewPort::GetDefaultScreenInfo(
     blink::WebScreenInfo* results) {
   const gfx::Display& display =
       gfx::Screen::GetNativeScreen()->GetPrimaryDisplay();
   results->rect = display.bounds();
   // TODO(husky): Remove any system controls from availableRect.
   results->availableRect = display.work_area();
   results->deviceScaleFactor = display.device_scale_factor();
   gfx::DeviceDisplayInfo info;
   results->depth = info.GetBitsPerPixel();
   results->depthPerComponent = info.GetBitsPerComponent();
   results->isMonochrome = (results->depthPerComponent == 0);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostView, public:
 
 // static
 RenderWidgetHostView*
 RenderWidgetHostView::CreateViewForWidget(RenderWidgetHost* widget) {
   RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(widget);
   return new RenderWidgetHostViewAndroid(rwhi, NULL);
 }
 
 } // namespace content