Merge 139479

Source/WebCore/platform/graphics/transforms/TransformState.cpp

 /*
  * Copyright (C) 2011 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 93 matching lines @@
 void TransformState::applyTransform(const AffineTransform& transformFromContainer, TransformAccumulation accumulate, bool* wasClamped)
 {
     applyTransform(transformFromContainer.toTransformationMatrix(), accumulate, wasClamped);
 }
 
 void TransformState::applyTransform(const TransformationMatrix& transformFromContainer, TransformAccumulation accumulate, bool* wasClamped)
 {
     if (wasClamped)
         *wasClamped = false;
 
+    if (transformFromContainer.isIntegerTranslation()) {
+        move(LayoutSize(transformFromContainer.e(), transformFromContainer.f()), accumulate);
+        return;
+    }
+
     applyAccumulatedOffset();
 
     // If we have an accumulated transform from last time, multiply in this transform
     if (m_accumulatedTransform) {
         if (m_direction == ApplyTransformDirection)
             m_accumulatedTransform = adoptPtr(new TransformationMatrix(transformFromContainer * *m_accumulatedTransform));
         else
             m_accumulatedTransform->multiply(transformFromContainer);
     } else if (accumulate == AccumulateTransform) {
         // Make one if we started to accumulate
@@ skipping 71 matching lines @@
 
     // We could throw away m_accumulatedTransform if we wanted to here, but that
     // would cause thrash when traversing hierarchies with alternating
     // preserve-3d and flat elements.
     if (m_accumulatedTransform)
         m_accumulatedTransform->makeIdentity();
     m_accumulatingTransform = false;
 }
 
 } // namespace WebCore