The Tor Browser: gfx/skia/trunk/src/utils/SkBitmapHasher.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     2 /*

     3  * Copyright 2012 Google Inc.

     4  *

     5  * Use of this source code is governed by a BSD-style license that can be

     6  * found in the LICENSE file.

     7  */

     9 #ifndef SkBitmapHasher_DEFINED

    10 #define SkBitmapHasher_DEFINED

    12 #include "SkBitmap.h"

    14 /**

    15  * Static class that generates a uint64 hash digest from an SkBitmap.

    16  */

    17 class SkBitmapHasher {

    18 public:

    19     /**

    20      * Fills in "result" with a hash of the pixels in this bitmap.

    21      *

    22      * If this is unable to compute the hash for some reason,

    23      * it returns false.

    24      *

    25      * Note: depending on the bitmap config, we may need to create an

    26      * intermediate SkBitmap and copy the pixels over to it... so in some

    27      * cases, performance and memory usage can suffer.

    28      */

    29     static bool ComputeDigest(const SkBitmap& bitmap, uint64_t *result);

    31 private:

    32     static bool ComputeDigestInternal(const SkBitmap& bitmap, uint64_t *result);

    33 };

    35 #endif

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