michael@0: 
michael@0: /*
michael@0:  * Copyright 2012 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #ifndef SkBitmapHasher_DEFINED
michael@0: #define SkBitmapHasher_DEFINED
michael@0: 
michael@0: #include "SkBitmap.h"
michael@0: 
michael@0: /**
michael@0:  * Static class that generates a uint64 hash digest from an SkBitmap.
michael@0:  */
michael@0: class SkBitmapHasher {
michael@0: public:
michael@0:     /**
michael@0:      * Fills in "result" with a hash of the pixels in this bitmap.
michael@0:      *
michael@0:      * If this is unable to compute the hash for some reason,
michael@0:      * it returns false.
michael@0:      *
michael@0:      * Note: depending on the bitmap config, we may need to create an
michael@0:      * intermediate SkBitmap and copy the pixels over to it... so in some
michael@0:      * cases, performance and memory usage can suffer.
michael@0:      */
michael@0:     static bool ComputeDigest(const SkBitmap& bitmap, uint64_t *result);
michael@0: 
michael@0: private:
michael@0:     static bool ComputeDigestInternal(const SkBitmap& bitmap, uint64_t *result);
michael@0: };
michael@0: 
michael@0: #endif