Add NV12 texture conversion support.

include/core/SkImage.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkImage_DEFINED
 #define SkImage_DEFINED
 
@@ skipping 120 matching lines @@
     /**
      *  Create a new image by copying the pixels from the specified y, u, v textures. The data
      *  from the textures is immediately ingested into the image and the textures can be modified or
      *  deleted after the function returns. The image will have the dimensions of the y texture.
      */
     static sk_sp<SkImage> MakeFromYUVTexturesCopy(GrContext*, SkYUVColorSpace,
                                                   const GrBackendObject yuvTextureHandles[3],
                                                   const SkISize yuvSizes[3],
                                                   GrSurfaceOrigin);
 
+    /**
+     *  Create a new image by copying the pixels from the specified y and uv textures. The data
+     *  from the textures is immediately ingested into the image and the textures can be modified or
+     *  deleted after the function returns. The image will have the dimensions of the y texture.
+     */
+    static sk_sp<SkImage> MakeFromNV12TexturesCopy(GrContext*, SkYUVColorSpace,
+                                                   const GrBackendObject nv12TextureHandles[2],
+                                                   const SkISize nv12Sizes[2], GrSurfaceOrigin);
+
     static sk_sp<SkImage> MakeFromPicture(sk_sp<SkPicture>, const SkISize& dimensions,
                                           const SkMatrix*, const SkPaint*);
 
     static sk_sp<SkImage> MakeTextureFromPixmap(GrContext*, const SkPixmap&, SkBudgeted budgeted);
 
     ///////////////////////////////////////////////////////////////////////////////////////////////
 
     int width() const { return fWidth; }
     int height() const { return fHeight; }
     SkISize dimensions() const { return SkISize::Make(fWidth, fHeight); }
@@ skipping 297 matching lines @@
                                                 SkBudgeted);
 
     const int       fWidth;
     const int       fHeight;
     const uint32_t  fUniqueID;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif