Skia side RGB to YUV gpu conversion

include/core/SkPixelRef.h

Index: include/core/SkPixelRef.h
diff --git a/include/core/SkPixelRef.h b/include/core/SkPixelRef.h
index a997993eb11e1d7f0a570c6e899deea66320c8a8..6a5cf15d9f30f3852afdaeb6f768ee278a711cfc 100644
--- a/include/core/SkPixelRef.h
+++ b/include/core/SkPixelRef.h
@@ -40,6 +40,7 @@
 
 class SkColorTable;
 class SkData;
+class SkImageGenerator;
 struct SkIRect;
 class SkMutex;
 
@@ -226,6 +227,10 @@ public:
      */
     virtual GrTexture* getTexture() { return NULL; }
 
+    /** Do we have data that requires decoding from an image generator?
+     */
+    virtual SkImageGenerator* getImageGenerator() const { return NULL; }

[sugoi1, 2014/07/08 14:42:02]

Since the new API was in SkImageGenerator, I assumed we needed a way to retrieve
it from SkPixelRef.

[reed1, 2014/07/08 15:08:52]

Hmm, I wonder if its safer to just expose getYUVPlanes() here as well, so we
don't require nor expose imagegenerator per-se

[sugoi1, 2014/07/09 19:57:43]

Done.

+
     bool readPixels(SkBitmap* dst, const SkIRect* subset = NULL);
 
     /**