Add a SkPixelSerializer SkImage encode variant

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
 
 #include "SkFilterQuality.h"
 #include "SkImageInfo.h"
 #include "SkImageEncoder.h"
 #include "SkRefCnt.h"
 #include "SkScalar.h"
 #include "SkShader.h"
 
 class SkData;
 class SkCanvas;
 class SkColorTable;
 class SkImageGenerator;
 class SkPaint;
 class SkPicture;
+class SkPixelSerializer;
 class SkString;
 class SkSurface;
 class SkSurfaceProps;
 class GrContext;
 class GrTexture;
 
 /**
  *  SkImage is an abstraction for drawing a rectagle of pixels, though the
  *  particular type of image could be actually storing its data on the GPU, or
  *  as drawing commands (picture or PDF or otherwise), ready to be played back
@@ skipping 182 matching lines @@
 
     /**
      *  Encode the image's pixels and return the result as a new SkData, which
      *  the caller must manage (i.e. call unref() when they are done).
      *
      *  If the image type cannot be encoded, or the requested encoder type is
      *  not supported, this will return NULL.
      */
     SkData* encode(SkImageEncoder::Type, int quality) const;
 
+    /**
+     *  Same as the above, but using the SkPixelSerializer.

[reed1, 2015/09/02 13:59:57]

// Can the serialize be null?
// What happens if the serializer returns false?

+     */
+    SkData* encode(SkPixelSerializer*) const;
+
     SkData* encode() const {
         return this->encode(SkImageEncoder::kPNG_Type, 100);
     }
 
     /**
      *  If the image already has its contents in encoded form (e.g. PNG or JPEG), return a ref
      *  to that data (which the caller must call unref() on). The caller is responsible for calling
      *  unref on the data when they are done.
      *
      *  If the image does not already has its contents in encoded form, return NULL.
@@ skipping 63 matching lines @@
 
 private:
     const int       fWidth;
     const int       fHeight;
     const uint32_t  fUniqueID;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif