Use SkPicture's InstallPixelRefProc to decode SkImages in an skp

src/core/SkReadBuffer.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkReadBuffer_DEFINED
 #define SkReadBuffer_DEFINED
 
@@ skipping 206 matching lines @@
     virtual bool validate(bool isValid) { return true; }
     virtual bool isValid() const { return true; }
     virtual bool validateAvailable(size_t size) { return true; }
 
 protected:
     SkReader32 fReader;
 
 private:
     bool readArray(void* value, size_t size, size_t elementSize);
 
+    /**
+     *  Try to use fBitmapDecoder to decode the data.  Returns true on success and false
+     *  on failure.
+     */
+    bool decodeBitmap(const void* data, size_t length, SkBitmap* bitmap,
+            const SkIRect& subset);
+
     uint32_t fFlags;
     int fVersion;
 
     void* fMemoryPtr;
 
     SkBitmapHeapReader* fBitmapStorage;
     SkTypeface** fTFArray;
     int        fTFCount;
 
     SkTDArray<SkFlattenable::Factory>* fFactoryTDArray;
     SkFlattenable::Factory* fFactoryArray;
     int                     fFactoryCount;
 
     SkPicture::InstallPixelRefProc fBitmapDecoder;
 
 #ifdef DEBUG_NON_DETERMINISTIC_ASSERT
     // Debugging counter to keep track of how many bitmaps we
     // have decoded.
     int fDecodedBitmapIndex;
 #endif // DEBUG_NON_DETERMINISTIC_ASSERT
 };
 
 #endif // SkReadBuffer_DEFINED