Support uploads of sub-rectangles of canvases to 2D and 3D textures.

third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.cpp

 /*
  * Copyright (c) 2010, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 656 matching lines @@
   return true;
 }
 
 bool DrawingBuffer::copyToPlatformTexture(gpu::gles2::GLES2Interface* gl,
                                           GLuint texture,
                                           GLenum internalFormat,
                                           GLenum destType,
                                           GLint level,
                                           bool premultiplyAlpha,
                                           bool flipY,
+                                          const IntPoint& destTextureOffset,
+                                          const IntRect& sourceSubRectangle,
                                           SourceDrawingBuffer sourceBuffer) {
   ScopedStateRestorer scopedStateRestorer(this);
 
   if (m_contentsChanged) {
     if (m_antiAliasingMode != None)
       resolveMultisampleFramebufferInternal();
     m_gl->Flush();
   }
 
   // Assume that the destination target is GL_TEXTURE_2D.
@@ skipping 25 matching lines @@
   GLuint sourceTexture =
       gl->CreateAndConsumeTextureCHROMIUM(target, mailbox.name);
 
   GLboolean unpackPremultiplyAlphaNeeded = GL_FALSE;
   GLboolean unpackUnpremultiplyAlphaNeeded = GL_FALSE;
   if (m_wantAlphaChannel && m_premultipliedAlpha && !premultiplyAlpha)
     unpackUnpremultiplyAlphaNeeded = GL_TRUE;
   else if (m_wantAlphaChannel && !m_premultipliedAlpha && premultiplyAlpha)
     unpackPremultiplyAlphaNeeded = GL_TRUE;
 
-  gl->CopyTextureCHROMIUM(sourceTexture, texture, internalFormat, destType,
-                          flipY, unpackPremultiplyAlphaNeeded,
-                          unpackUnpremultiplyAlphaNeeded);
+  gl->CopySubTextureCHROMIUM(
+      sourceTexture, texture, destTextureOffset.x(), destTextureOffset.y(),
+      sourceSubRectangle.x(), sourceSubRectangle.y(),
+      sourceSubRectangle.width(), sourceSubRectangle.height(), flipY,
+      unpackPremultiplyAlphaNeeded, unpackUnpremultiplyAlphaNeeded);
 
   gl->DeleteTextures(1, &sourceTexture);
 
   const GLuint64 fenceSync = gl->InsertFenceSyncCHROMIUM();
 
   gl->Flush();
   gpu::SyncToken syncToken;
   gl->GenSyncTokenCHROMIUM(fenceSync, syncToken.GetData());
   m_gl->WaitSyncTokenCHROMIUM(syncToken.GetData());
 
@@ skipping 518 matching lines @@
   if (m_pixelUnpackBufferBindingDirty)
     client->DrawingBufferClientRestorePixelUnpackBufferBinding();
 }
 
 bool DrawingBuffer::shouldUseChromiumImage() {
   return RuntimeEnabledFeatures::webGLImageChromiumEnabled() &&
          m_chromiumImageUsage == AllowChromiumImage;
 }
 
 }  // namespace blink