Use correct destination rectangle in FEComposite w/ type='in'

Source/platform/graphics/filters/FEComposite.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2005 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2013 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
@@ skipping 313 matching lines @@
         filterContext->drawImageBuffer(imageBuffer2, drawingRegionOfInputImage(in2->absolutePaintRect()));
         filterContext->drawImageBuffer(imageBuffer, drawingRegionOfInputImage(in->absolutePaintRect()));
         break;
     case FECOMPOSITE_OPERATOR_IN: {
         // Applies only to the intersected region.
         IntRect destinationRect = in->absolutePaintRect();
         destinationRect.intersect(in2->absolutePaintRect());
         destinationRect.intersect(absolutePaintRect());
         if (destinationRect.isEmpty())
             break;
-        IntPoint destinationPoint(destinationRect.x() - absolutePaintRect().x(), destinationRect.y() - absolutePaintRect().y());
         FloatRect sourceRect(IntPoint(destinationRect.x() - in->absolutePaintRect().x(),
                                     destinationRect.y() - in->absolutePaintRect().y()), destinationRect.size());
         FloatRect source2Rect(IntPoint(destinationRect.x() - in2->absolutePaintRect().x(),
                                      destinationRect.y() - in2->absolutePaintRect().y()), destinationRect.size());
-        filterContext->drawImageBuffer(imageBuffer2,
-            FloatRect(destinationPoint, imageBuffer2->size()), &source2Rect);
-        filterContext->drawImageBuffer(imageBuffer,
-            FloatRect(destinationPoint, imageBuffer->size()), &sourceRect, CompositeSourceIn);
+        destinationRect.move(-absolutePaintRect().x(), -absolutePaintRect().y());
+        filterContext->drawImageBuffer(imageBuffer2, destinationRect, &source2Rect);
+        filterContext->drawImageBuffer(imageBuffer, destinationRect, &sourceRect, CompositeSourceIn);
         break;
     }
     case FECOMPOSITE_OPERATOR_OUT:
         filterContext->drawImageBuffer(imageBuffer, drawingRegionOfInputImage(in->absolutePaintRect()));
         filterContext->drawImageBuffer(imageBuffer2, drawingRegionOfInputImage(in2->absolutePaintRect()), 0, CompositeDestinationOut);
         break;
     case FECOMPOSITE_OPERATOR_ATOP:
         filterContext->drawImageBuffer(imageBuffer2, drawingRegionOfInputImage(in2->absolutePaintRect()));
         filterContext->drawImageBuffer(imageBuffer, drawingRegionOfInputImage(in->absolutePaintRect()), 0, CompositeSourceAtop);
         break;
@@ skipping 84 matching lines @@
     ts << " operation=\"" << m_type << "\"";
     if (m_type == FECOMPOSITE_OPERATOR_ARITHMETIC)
         ts << " k1=\"" << m_k1 << "\" k2=\"" << m_k2 << "\" k3=\"" << m_k3 << "\" k4=\"" << m_k4 << "\"";
     ts << "]\n";
     inputEffect(0)->externalRepresentation(ts, indent + 1);
     inputEffect(1)->externalRepresentation(ts, indent + 1);
     return ts;
 }
 
 } // namespace WebCore