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..2f0e5de2c2ef0f95f32eb26f6808ff059ea679f1 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 = 0) const OVERRIDE;

[Stephen White, 2014/07/25 17:03:43]

Nit: seems strange to have a default argument here; it's a new function so let's
just make all callers be explicit.

[sugoi1, 2014/07/25 17:08:38]

You're right, I had originally put this here because I was modifying
decodedSize, but since I added decodedYUVSize, the default argument is no longer
necessary.

     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(); }
+    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;
 };