Skia side RGB to YUV gpu conversion

include/core/SkImageGenerator.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkImageGenerator_DEFINED
 #define SkImageGenerator_DEFINED
 
@@ skipping 98 matching lines @@
      */
     bool getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
                    SkPMColor ctable[], int* ctableCount);
 
     /**
      *  Simplified version of getPixels() that asserts that info is NOT kIndex8_SkColorType.
      */
     bool getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes);
 #endif
 
+    /**
+     *  If planes or rowBytes is NULL or if any entry in planes is NULL or if any entry in rowBytes
+     *  is 0, this imagegenerator should output the sizes and return true if it can efficiently
+     *  return YUV planar data. If it cannot, it should return false. Note that either planes and
+     *  rowBytes are both fully defined and non NULL/non 0 or they are both NULL or have NULL or 0
+     *  entries only. Having only partial planes/rowBytes information is not supported.
+     *
+     *  If all planes and rowBytes entries are non NULL or non 0, then it should copy the
+     *  associated YUV 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]);
+
 protected:
     virtual SkData* onRefEncodedData();
     virtual bool onGetInfo(SkImageInfo* info);
     virtual bool onGetPixels(const SkImageInfo& info,
                              void* pixels, size_t rowBytes,
                              SkPMColor ctable[], int* ctableCount);
+    virtual bool onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3]);
 };
 
 #endif  // SkImageGenerator_DEFINED