Skia side RGB to YUV gpu conversion

include/core/SkPixelRef.h

 /*
  * Copyright 2008 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPixelRef_DEFINED
 #define SkPixelRef_DEFINED
 
@@ skipping 22 matching lines @@
 
 #ifdef SK_SUPPORT_LEGACY_PIXELREF_UNFLATTENABLE
     // we only support unflattening, not flattening
     #define SK_PIXELREF_BASECLASS   SkFlattenable
 #else
     #define SK_PIXELREF_BASECLASS   SkRefCnt
 #endif
 
 class SkColorTable;
 class SkData;
+class SkImageGenerator;
 struct SkIRect;
 class SkMutex;
 
 class GrTexture;
 
 /** \class SkPixelRef
 
     This class is the smart container for pixel memory, and is used with
     SkBitmap. A pixelref is installed into a bitmap, and then the bitmap can
     access the actual pixel memory by calling lockPixels/unlockPixels.
@@ skipping 166 matching lines @@
      */
     bool decodeInto(int pow2, SkBitmap* bitmap) {
         SkASSERT(pow2 >= 0);
         return this->onDecodeInto(pow2, bitmap);
     }
 
     /** Are we really wrapping a texture instead of a bitmap?
      */
     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);
 
     /**
      *  Makes a deep copy of this PixelRef, respecting the requested config.
      *  @param colorType Desired colortype.
      *  @param subset Subset of this PixelRef to copy. Must be fully contained within the bounds of
      *         of this PixelRef.
      *  @return A new SkPixelRef, or NULL if either there is an error (e.g. the destination could
      *          not be created with the given config), or this PixelRef does not support deep
      *          copies.
@@ skipping 144 matching lines @@
     /**
      *  Allocate a new pixelref matching the specified ImageInfo, allocating
      *  the memory for the pixels. If the ImageInfo requires a ColorTable,
      *  the pixelref will ref() the colortable.
      *  On failure return NULL.
      */
     virtual SkPixelRef* create(const SkImageInfo&, size_t rowBytes, SkColorTable*) = 0;
 };
 
 #endif