1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/utils/SkBitmapHasher.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,35 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2012 Google Inc.
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +
1.12 +#ifndef SkBitmapHasher_DEFINED
1.13 +#define SkBitmapHasher_DEFINED
1.14 +
1.15 +#include "SkBitmap.h"
1.16 +
1.17 +/**
1.18 + * Static class that generates a uint64 hash digest from an SkBitmap.
1.19 + */
1.20 +class SkBitmapHasher {
1.21 +public:
1.22 + /**
1.23 + * Fills in "result" with a hash of the pixels in this bitmap.
1.24 + *
1.25 + * If this is unable to compute the hash for some reason,
1.26 + * it returns false.
1.27 + *
1.28 + * Note: depending on the bitmap config, we may need to create an
1.29 + * intermediate SkBitmap and copy the pixels over to it... so in some
1.30 + * cases, performance and memory usage can suffer.
1.31 + */
1.32 + static bool ComputeDigest(const SkBitmap& bitmap, uint64_t *result);
1.33 +
1.34 +private:
1.35 + static bool ComputeDigestInternal(const SkBitmap& bitmap, uint64_t *result);
1.36 +};
1.37 +
1.38 +#endif
