Make 2D canvas smarter about chosing whether or not to use GPU acceleration

Source/modules/webgl/WebGLRenderingContextBase.cpp

 /*
  * Copyright (C) 2009 Apple Inc. 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 4272 matching lines @@
     if (isContextLost() || !validateHTMLCanvasElement("texImage2D", canvas, exceptionState) || !validateTexFunc("texImage2D", NotTexSubImage2D, SourceHTMLCanvasElement, target, level, internalformat, canvas->width(), canvas->height(), 0, format, type, 0, 0))
         return;
 
     WebGLTexture* texture = validateTextureBinding("texImage2D", target, true);
     ASSERT(texture);
 
     // texImage2DCanvasByGPU relies on copyTextureCHROMIUM which doesn't support float type.
     bool isFloatType = type == GL_FLOAT || type == GL_HALF_FLOAT_OES;
     if (!canvas->renderingContext() || !canvas->renderingContext()->isAccelerated() || isFloatType) {
         // 2D canvas has only FrontBuffer.
-        texImage2DImpl(target, level, internalformat, format, type, canvas->copiedImage(FrontBuffer).get(),
+        texImage2DImpl(target, level, internalformat, format, type, canvas->copiedImage(FrontBuffer, PreferAcceleration).get(),
             WebGLImageConversion::HtmlDomCanvas, m_unpackFlipY, m_unpackPremultiplyAlpha);
         return;
     }
 
     texImage2DCanvasByGPU(NotTexSubImage2D, texture, target, level, internalformat, type, 0, 0, canvas);
     texture->setLevelInfo(target, level, internalformat, canvas->width(), canvas->height(), 1, type);
 }
 
 PassRefPtr<Image> WebGLRenderingContextBase::videoFrameToImage(HTMLVideoElement* video)
 {
@@ skipping 227 matching lines @@
     if (isContextLost() || !validateHTMLCanvasElement("texSubImage2D", canvas, exceptionState)
         || !validateTexFunc("texSubImage2D", TexSubImage2D, SourceHTMLCanvasElement, target, level, 0, canvas->width(), canvas->height(), 0, format, type, xoffset, yoffset))
         return;
 
     WebGLTexture* texture = validateTextureBinding("texSubImage2D", target, true);
     ASSERT(texture);
 
     bool isFloatType = type == GL_FLOAT || type == GL_HALF_FLOAT_OES;
     if (!canvas->renderingContext() || !canvas->renderingContext()->isAccelerated() || isFloatType) {
         // 2D canvas has only FrontBuffer.
-        texSubImage2DImpl(target, level, xoffset, yoffset, format, type, canvas->copiedImage(FrontBuffer).get(),
+        texSubImage2DImpl(target, level, xoffset, yoffset, format, type, canvas->copiedImage(FrontBuffer, PreferAcceleration).get(),
             WebGLImageConversion::HtmlDomCanvas, m_unpackFlipY, m_unpackPremultiplyAlpha);
         return;
     }
 
     texImage2DCanvasByGPU(TexSubImage2D, texture, target, level, GL_RGBA, type, xoffset, yoffset, canvas);
 }
 
 void WebGLRenderingContextBase::texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
     GLenum format, GLenum type, HTMLVideoElement* video, ExceptionState& exceptionState)
 {
@@ skipping 2164 matching lines @@
 
     return totalBytesPerPixel;
 }
 
 DrawingBuffer* WebGLRenderingContextBase::drawingBuffer() const
 {
     return m_drawingBuffer.get();
 }
 
 } // namespace blink