[Experiment] Animated image decoder benchmark tool

Source/platform/image-decoders/ImageDecoder.cpp

 /*
  * Copyright (C) Research In Motion Limited 2009-2010. 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.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 180 matching lines @@
         // this frame is a blank frame, so it can again be decoded alone.
         // Otherwise, the previous frame contributes to this frame.
         return (prevBuffer->originalFrameRect().contains(IntRect(IntPoint(), size()))
             || (prevBuffer->requiredPreviousFrameIndex() == kNotFound)) ? kNotFound : prevFrame;
     default:
         ASSERT_NOT_REACHED();
         return kNotFound;
     }
 }
 
+size_t ImageDecoder::countIndependentFrames() const
+{
+    size_t count = 0;
+    for (size_t i = 0; i < m_frameBufferCache.size(); ++i) {
+        if (m_frameBufferCache[i].requiredPreviousFrameIndex() == kNotFound)
+            ++count;
+    }
+    return count;
+}
+
+float ImageDecoder::countAverageDependentFrames() const
+{
+    const size_t numFrames = m_frameBufferCache.size();
+    float total = 0;
+    for (size_t i = 0; i < numFrames; ++i) {
+        const ImageFrame* buffer = &m_frameBufferCache[i];
+        while (buffer->requiredPreviousFrameIndex() != kNotFound) {
+            ++total;
+            buffer = &m_frameBufferCache[buffer->requiredPreviousFrameIndex()];
+        }
+    }
+    return total / numFrames;
+}
+
+size_t ImageDecoder::countMaxDependentFrames() const
+{
+    size_t max = 0;
+    for (size_t i = 0; i < m_frameBufferCache.size(); ++i) {
+        size_t count = 0;
+        const ImageFrame* buffer = &m_frameBufferCache[i];
+        while (buffer->requiredPreviousFrameIndex() != kNotFound) {
+            ++count;
+            buffer = &m_frameBufferCache[buffer->requiredPreviousFrameIndex()];
+        }
+        if (count > max)
+            max = count;
+    }
+    return max;
+}
+
 } // namespace WebCore