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

third_party/WebKit/Source/platform/graphics/DecodingImageGenerator.cpp

 /*
  * Copyright (C) 2012 Google 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
@@ skipping 52 matching lines @@
     if (info.width() != getInfo().width() || info.height() != getInfo().height())
         return false;
 
     if (info.colorType() != getInfo().colorType()) {
         // blink::ImageFrame may have changed the owning SkBitmap to kOpaque_SkAlphaType after fully decoding the image frame,
         // so if we see a request for opaque, that is ok even if our initial alpha type was not opaque.
         return false;
     }
 
     PlatformInstrumentation::willDecodeLazyPixelRef(m_generationId);
-    bool decoded = m_frameGenerator->decodeAndScale(getInfo(), m_frameIndex, pixels, rowBytes);
+    bool decoded = m_frameGenerator->decodeAndScale(info, m_frameIndex, pixels, rowBytes, table, tableCount);
     PlatformInstrumentation::didDecodeLazyPixelRef();
 
     return decoded;
 }
 
 bool DecodingImageGenerator::onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3], SkYUVColorSpace* colorSpace)
 {
     if (!m_canYUVDecode)
         return false;
 
@@ skipping 22 matching lines @@
     // we only need the size, it doesn't really matter about premul or not, or gamma settings.
     OwnPtr<ImageDecoder> decoder = ImageDecoder::create(*buffer.get(), ImageDecoder::AlphaPremultiplied, ImageDecoder::GammaAndColorProfileApplied);
     if (!decoder)
         return 0;
 
     decoder->setData(buffer.get(), true);
     if (!decoder->isSizeAvailable())
         return 0;
 
     const IntSize size = decoder->size();
-    const SkImageInfo info = SkImageInfo::MakeN32Premul(size.width(), size.height());
+    const SkImageInfo info = decoder->canDecodeTo(0, ImageFrame::Index8)
+        ? SkImageInfo::Make(size.width(), size.height(), kIndex_8_SkColorType, kPremul_SkAlphaType)
+        : SkImageInfo::MakeN32Premul(size.width(), size.height());
 
     RefPtr<ImageFrameGenerator> frame = ImageFrameGenerator::create(SkISize::Make(size.width(), size.height()), buffer, true, false);
     if (!frame)
         return 0;
 
     return new DecodingImageGenerator(frame, info, 0);
 }
 
 } // namespace blink