GIF decoding to Index8, unit tests and misusing unit test as benchmark

third_party/WebKit/Source/platform/image-decoders/gif/GIFImageReader.cpp

 /* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* ***** BEGIN LICENSE BLOCK *****
  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
  * the License. You may obtain a copy of the License at
  * http://www.mozilla.org/MPL/
  *
  * Software distributed under the License is distributed on an "AS IS" basis,
@@ skipping 325 matching lines @@
 
         m_lzwContext = adoptPtr(new GIFLZWContext(client, this));
         if (!m_lzwContext->prepareToDecode()) {
             m_lzwContext.clear();
             return false;
         }
 
         m_currentLzwBlock = 0;
     }
 
+    if (m_lzwContext->hasRemainingRows()) {
+        if (!client->initFrameBuffer(m_frameId))
+            return false;
+    }
+
     // Some bad GIFs have extra blocks beyond the last row, which we don't want to decode.
     while (m_currentLzwBlock < m_lzwBlocks.size() && m_lzwContext->hasRemainingRows()) {
         size_t blockPosition = m_lzwBlocks[m_currentLzwBlock].blockPosition;
         size_t blockSize = m_lzwBlocks[m_currentLzwBlock].blockSize;
         if (blockPosition + blockSize > reader->size())
             return false;
 
         while (blockSize) {
             const char* segment = 0;
             size_t segmentLength = reader->getSomeData(segment, blockPosition);
@@ skipping 485 matching lines @@
     rowIter = rowBuffer.begin();
     rowsRemaining = m_frameContext->height();
 
     // Clearing the whole suffix table lets us be more tolerant of bad data.
     for (int i = 0; i < clearCode; ++i) {
         suffix[i] = i;
         suffixLength[i] = 1;
     }
     return true;
 }