Allowing YUV data to be retrieved from the JPEG Decoder.

Source/platform/image-decoders/jpeg/JPEGImageDecoder.h

Index: Source/platform/image-decoders/jpeg/JPEGImageDecoder.h
diff --git a/Source/platform/image-decoders/jpeg/JPEGImageDecoder.h b/Source/platform/image-decoders/jpeg/JPEGImageDecoder.h
index 9293a67e44a45766ff89348e833f5e203c0be4cf..c246798d87da09810971b47a835356dd6a841f3b 100644
--- a/Source/platform/image-decoders/jpeg/JPEGImageDecoder.h
+++ b/Source/platform/image-decoders/jpeg/JPEGImageDecoder.h
@@ -48,12 +48,16 @@ public:
     virtual bool isSizeAvailable() OVERRIDE;
     virtual bool hasColorProfile() const OVERRIDE { return m_hasColorProfile; }
     virtual IntSize decodedSize() const OVERRIDE { return m_decodedSize; }
+    virtual IntSize decodedYUVSize(int component) const OVERRIDE;
     virtual bool setSize(unsigned width, unsigned height) OVERRIDE;
     virtual ImageFrame* frameBufferAtIndex(size_t) OVERRIDE;
     // CAUTION: setFailed() deletes |m_reader|.  Be careful to avoid
     // accessing deleted memory, especially when calling this from inside
     // JPEGImageReader!
     virtual bool setFailed() OVERRIDE;
+    virtual bool YUVDecoding() const OVERRIDE { return m_imagePlanes.get(); }

[Noel Gordon, 2014/07/28 07:29:07]

Could you have imagePlanes, but be decoding into output_color_space RGBA?

+    virtual bool decodeToYUV() OVERRIDE;
+    virtual void setImagePlanes(OwnPtr<ImagePlanes>&) OVERRIDE;
 
     bool outputScanlines();
     unsigned desiredScaleNumerator() const;
@@ -70,6 +74,7 @@ private:
     void decode(bool onlySize);
 
     OwnPtr<JPEGImageReader> m_reader;
+    OwnPtr<ImagePlanes> m_imagePlanes;
     IntSize m_decodedSize;
     bool m_hasColorProfile;
 };