start on apply gamma cleanup

include/core/SkSurface.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 SkSurface_DEFINED
 #define SkSurface_DEFINED
 
@@ skipping 321 matching lines @@
     /**
      *  Though the caller could get a snapshot image explicitly, and draw that,
      *  it seems that directly drawing a surface into another canvas might be
      *  a common pattern, and that we could possibly be more efficient, since
      *  we'd know that the "snapshot" need only live until we've handed it off
      *  to the canvas.
      */
     void draw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*);
 
     /**
+     * Copies contents of image to this surface, while applying a gamma curve. Fails if the image
+     * and surface are not ideniticaly sized. Fails if the surface is not gpu backed. This ignores
+     * all SkCanvas state including the SkCanvas layer stack.
+     */
+    bool blitWithGamma(SkImage* image, SkScalar gamma);
+
+    /**
      *  If the surface has direct access to its pixels (i.e. they are in local
      *  RAM) return true, and if not null, set the pixmap parameter to point to the information
      *  about the surface's pixels. The pixel address in the pixmap is only valid while
      *  the surface object is in scope, and no API call is made on the surface
      *  or its canvas.
      *
      *  On failure, returns false and the pixmap parameter is ignored.
      */
     bool peekPixels(SkPixmap*);
 
@@ skipping 41 matching lines @@
 private:
     const SkSurfaceProps fProps;
     const int            fWidth;
     const int            fHeight;
     uint32_t             fGenerationID;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif