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1 | |
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 */ | |
8 | |
9 #ifndef SkBitmapChecksummer_DEFINED | |
10 #define SkBitmapChecksummer_DEFINED | |
11 | |
12 #include "SkBitmap.h" | |
13 #include "SkBitmapTransformer.h" | |
14 | |
15 /** | |
16 * Static class that can generate checksums from SkBitmaps. | |
17 */ | |
18 class SkBitmapChecksummer { | |
19 public: | |
20 /** | |
21 * Returns a 64-bit checksum of the pixels in this bitmap. | |
22 * | |
23 * If this is unable to compute the checksum for some reason, | |
24 * it returns 0. | |
25 * | |
26 * Note: depending on the bitmap config, we may need to create an | |
27 * intermediate SkBitmap and copy the pixels over to it... so in some | |
28 * cases, performance and memory usage can suffer. | |
29 */ | |
30 static uint64_t Compute64(const SkBitmap& bitmap); | |
31 | |
32 private: | |
33 static uint64_t Compute64Internal(const SkBitmap& bitmap, | |
34 const SkBitmapTransformer& transformer); | |
35 }; | |
36 | |
37 #endif | |
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