WebGL: accelerated texImage2D and texSubImage2D for canvas

Source/core/html/HTMLCanvasElement.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 661 matching lines @@
 void HTMLCanvasElement::ensureUnacceleratedImageBuffer()
 {
     if ((hasImageBuffer() && !m_imageBuffer->isAccelerated()) || m_didFailToCreateImageBuffer)
         return;
     discardImageBuffer();
     OpacityMode opacityMode = !m_context || m_context->hasAlpha() ? NonOpaque : Opaque;
     m_imageBuffer = ImageBuffer::create(size(), opacityMode);
     m_didFailToCreateImageBuffer = !m_imageBuffer;
 }
 
-Image* HTMLCanvasElement::copiedImage(SourceDrawingBuffer sourceBuffer) const
+Image* HTMLCanvasElement::copiedImage() const

[dshwang, 2014/11/27 21:31:10]

@junov, now it's fixed, as you mentioned in
https://codereview.chromium.org/758493004/#msg8

[dshwang, 2014/12/08 14:09:24]

I drop this fix because ImageBitmap still use copiedImage(BackBuffer) :'( I'll
fix it in another CL.

 {
     if (!m_copiedImage && buffer()) {
         if (m_context && m_context->is3d())
-            m_context->paintRenderingResultsToCanvas(sourceBuffer);
+            m_context->paintRenderingResultsToCanvas(FrontBuffer);
         m_copiedImage = buffer()->copyImage(CopyBackingStore, Unscaled);
         updateExternallyAllocatedMemory();
     }
     return m_copiedImage.get();
 }
 
 void HTMLCanvasElement::discardImageBuffer()
 {
     m_contextStateSaver.clear(); // uses context owned by m_imageBuffer
     m_imageBuffer.clear();
@@ skipping 77 matching lines @@
 {
     return !originClean();
 }
 
 FloatSize HTMLCanvasElement::sourceSize() const
 {
     return FloatSize(width(), height());
 }
 
 }