Merge 117191 - Assertion failure running Mozilla's WebGL performance regression tests

Source/WebCore/platform/graphics/qt/GraphicsContext3DQt.cpp

 /*
     Copyright (C) 2010 Tieto Corporation.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
      
     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 1596 matching lines @@
     // Is image already loaded? If not, load it.
     if (image->data())
         nativeImage = QImage::fromData(reinterpret_cast<const uchar*>(image->data()->data()), image->data()->size()).convertToFormat(QImage::Format_ARGB32);
     else {
         QPixmap* nativePixmap = image->nativeImageForCurrentFrame();
         nativeImage = nativePixmap->toImage().convertToFormat(QImage::Format_ARGB32);
     }
     AlphaOp neededAlphaOp = AlphaDoNothing;
     if (premultiplyAlpha)
         neededAlphaOp = AlphaDoPremultiply;
-    outputVector.resize(nativeImage.byteCount());
+
+    unsigned int packedSize;
+    // Output data is tightly packed (alignment == 1).
+    if (computeImageSizeInBytes(format, type, image->width(), image->height(), 1, &packedSize, 0) != GraphicsContext3D::NO_ERROR)
+        return false;
+    outputVector.resize(packedSize);
+
     return packPixels(nativeImage.bits(), SourceFormatBGRA8, image->width(), image->height(), 0, format, type, neededAlphaOp, outputVector.data());
 }
 
 void GraphicsContext3D::setContextLostCallback(PassOwnPtr<ContextLostCallback>)
 {
 }
 
 void GraphicsContext3D::setErrorMessageCallback(PassOwnPtr<ErrorMessageCallback>)
 {
 }
 
 }
 
 #endif // ENABLE(WEBGL)