Avoid GPU readback in tex(Sub)Image2D(ImageBitmap)

third_party/WebKit/Source/core/html/HTMLImageElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 788 matching lines @@
     EventDispatchForbiddenScope::AllowUserAgentEvents allowEvents;
     ensureUserAgentShadowRoot();
 }
 
 bool HTMLImageElement::isOpaque() const
 {
     Image* image = const_cast<HTMLImageElement*>(this)->imageContents();
     return image && image->currentFrameKnownToBeOpaque();
 }
 
+int HTMLImageElement::sourceWidth()
+{
+    SourceImageStatus status;
+    FloatSize defaultObjectSize(width(), height());
+    RefPtr<Image> image = getSourceImageForCanvas(&status, PreferNoAcceleration, SnapshotReasonCopyToWebGLTexture, defaultObjectSize);
+    return image->width();
+}
+
+int HTMLImageElement::sourceHeight()
+{
+    SourceImageStatus status;
+    FloatSize defaultObjectSize(width(), height());
+    RefPtr<Image> image = getSourceImageForCanvas(&status, PreferNoAcceleration, SnapshotReasonCopyToWebGLTexture, defaultObjectSize);
+    return image->height();
+}
+
 IntSize HTMLImageElement::bitmapSourceSize() const
 {
     ImageResource* image = cachedImage();
     if (!image)
         return IntSize();
     LayoutSize lSize = image->imageSize(LayoutObject::shouldRespectImageOrientation(layoutObject()), 1.0f);
     ASSERT(lSize.fraction().isZero());
     return IntSize(lSize.width(), lSize.height());
 }
 
 } // namespace blink