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/*
* 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 SkBitmapHasher_DEFINED
#define SkBitmapHasher_DEFINED
#include "SkBitmap.h"
#include "SkBitmapTransformer.h"
// TODO(epoger): Soon, SkHashDigest will become a real class of its own,
// and callers won't be able to assume it converts to/from a uint64_t.
typedef uint64_t SkHashDigest;
/**
* Static class that can generate an SkHashDigest from an SkBitmap.
*/
class SkBitmapHasher {
public:
/**
* Fills in "result" with a hash of the pixels in this bitmap.
*
* If this is unable to compute the hash for some reason,
* it returns false.
*
* Note: depending on the bitmap config, we may need to create an
* intermediate SkBitmap and copy the pixels over to it... so in some
* cases, performance and memory usage can suffer.
*/
static bool ComputeDigest(const SkBitmap& bitmap, SkHashDigest *result);
private:
static bool ComputeDigestInternal(const SkBitmap& bitmap,
const SkBitmapTransformer& transformer,
SkHashDigest *result);
};
#endif
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