Merge 96151 - Rapidly refreshing a feMorphology[erode] with r=0 can sometimes cause display corru...

Source/WebCore/platform/graphics/filters/FETurbulence.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) 2010 Renata Hodovan <reni@inf.u-szeged.hu>
  * Copyright (C) 2011 Gabor Loki <loki@webkit.org>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 354 matching lines @@
 #endif // ENABLE(PARALLEL_JOBS)
 
 void FETurbulence::apply()
 {
     if (hasResult())
         return;
     ByteArray* pixelArray = createUnmultipliedImageResult();
     if (!pixelArray)
         return;
 
-    if (absolutePaintRect().isEmpty())
+    if (absolutePaintRect().isEmpty()) {
+        pixelArray->clear();
         return;
+    }
 
     PaintingData paintingData(m_seed, roundedIntSize(filterPrimitiveSubregion().size()));
     initPaint(paintingData);
 
 #if ENABLE(PARALLEL_JOBS)
 
     int optimalThreadNumber = (absolutePaintRect().width() * absolutePaintRect().height()) / s_minimalRectDimension;
     if (optimalThreadNumber > 1) {
         // Initialize parallel jobs
         ParallelJobs<FillRegionParameters> parallelJobs(&WebCore::FETurbulence::fillRegionWorker, optimalThreadNumber);
@@ skipping 58 matching lines @@
        << "baseFrequency=\"" << baseFrequencyX() << ", " << baseFrequencyY() << "\" "
        << "seed=\"" << seed() << "\" "
        << "numOctaves=\"" << numOctaves() << "\" "
        << "stitchTiles=\"" << stitchTiles() << "\"]\n";
     return ts;
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(FILTERS)