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
 
 #include "SkBitmap.h"
 #include "SkDynamicAnnotations.h"
 #include "SkRefCnt.h"
 #include "SkString.h"
 #include "SkImageInfo.h"
+#include "SkSize.h"
 #include "SkTDArray.h"
 
 //#define xed
 
 #ifdef SK_DEBUG
     /**
      *  Defining SK_IGNORE_PIXELREF_SETPRELOCKED will force all pixelref
      *  subclasses to correctly handle lock/unlock pixels. For performance
      *  reasons, simple malloc-based subclasses call setPreLocked() to skip
      *  the overhead of implementing these calls.
@@ skipping 186 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; }
 
+    /**
+     *  If any planes or rowBytes is NULL, this should output the sizes and return true
+     *  if it can efficiently return YUV planar data. If it cannot, it should return false.
+     *
+     *  If all planes and rowBytes are not NULL, then it should copy the associated Y,U,V data
+     *  into those planes of memory supplied by the caller. It should validate that the sizes
+     *  match what it expected. If the sizes do not match, it should return false.
+     */
+    bool getYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3]) {
+        return this->onGetYUV8Planes(sizes, planes, rowBytes);
+    }
+
     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 66 matching lines @@
      *  For pixelrefs that don't have access to their raw pixels, they may be
      *  able to make a copy of them (e.g. if the pixels are on the GPU).
      *
      *  The base class implementation returns false;
      */
     virtual bool onReadPixels(SkBitmap* dst, const SkIRect* subsetOrNull);
 
     // default impl returns NULL.
     virtual SkData* onRefEncodedData();
 
+    // default impl returns false.
+    virtual bool onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3]);
+
     /**
      *  Returns the size (in bytes) of the internally allocated memory.
      *  This should be implemented in all serializable SkPixelRef derived classes.
      *  SkBitmap::fPixelRefOffset + SkBitmap::getSafeSize() should never overflow this value,
      *  otherwise the rendering code may attempt to read memory out of bounds.
      *
      *  @return default impl returns 0.
      */
     virtual size_t getAllocatedSizeInBytes() const;
 
@@ skipping 47 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