SkImage method for detecting lazy decoding

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 270 matching lines @@
      *  Attempt to create a bitmap with the same pixels as the image. The result will always be
      *  a raster-backed bitmap (texture-backed bitmaps are DEPRECATED, and not supported here).
      *
      *  If the mode is kRO (read-only), the resulting bitmap will be marked as immutable.
      *
      *  On succcess, returns true. On failure, returns false and the bitmap parameter will be reset
      *  to empty.
      */
     bool asLegacyBitmap(SkBitmap*, LegacyBitmapMode) const;
     
+    /**
+     *  Returns true if the image is backed by an image-generator or other src that creates
+     *  (and caches) its pixels / texture on-demand.
+     */
+    bool isLazyGenerated() const;
+
 protected:
     SkImage(int width, int height, uint32_t uniqueID);
 
 private:
     const int       fWidth;
     const int       fHeight;
     const uint32_t  fUniqueID;
 
     typedef SkRefCnt INHERITED;
 };
 
 #endif