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1 | 1 |
2 /* | 2 /* |
3 * Copyright 2012 Google Inc. | 3 * Copyright 2012 Google Inc. |
4 * | 4 * |
5 * Use of this source code is governed by a BSD-style license that can be | 5 * Use of this source code is governed by a BSD-style license that can be |
6 * found in the LICENSE file. | 6 * found in the LICENSE file. |
7 */ | 7 */ |
8 | 8 |
9 #ifndef SkBitmapHasher_DEFINED | 9 #ifndef SkBitmapHasher_DEFINED |
10 #define SkBitmapHasher_DEFINED | 10 #define SkBitmapHasher_DEFINED |
11 | 11 |
12 #include "SkBitmap.h" | 12 #include "SkBitmap.h" |
13 | 13 |
14 #define BITMAPHASHER_USES_TRUNCATED_MD5 | |
15 | |
16 // TODO(epoger): Soon, SkHashDigest will become a real class of its own, | 14 // TODO(epoger): Soon, SkHashDigest will become a real class of its own, |
17 // and callers won't be able to assume it converts to/from a uint64_t. | 15 // and callers won't be able to assume it converts to/from a uint64_t. |
18 typedef uint64_t SkHashDigest; | 16 typedef uint64_t SkHashDigest; |
19 | 17 |
20 /** | 18 /** |
21 * Static class that can generate an SkHashDigest from an SkBitmap. | 19 * Static class that can generate an SkHashDigest from an SkBitmap. |
22 */ | 20 */ |
23 class SkBitmapHasher { | 21 class SkBitmapHasher { |
24 public: | 22 public: |
25 /** | 23 /** |
26 * Fills in "result" with a hash of the pixels in this bitmap. | 24 * Fills in "result" with a hash of the pixels in this bitmap. |
27 * | 25 * |
28 * If this is unable to compute the hash for some reason, | 26 * If this is unable to compute the hash for some reason, |
29 * it returns false. | 27 * it returns false. |
30 * | 28 * |
31 * Note: depending on the bitmap config, we may need to create an | 29 * Note: depending on the bitmap config, we may need to create an |
32 * intermediate SkBitmap and copy the pixels over to it... so in some | 30 * intermediate SkBitmap and copy the pixels over to it... so in some |
33 * cases, performance and memory usage can suffer. | 31 * cases, performance and memory usage can suffer. |
34 */ | 32 */ |
35 static bool ComputeDigest(const SkBitmap& bitmap, SkHashDigest *result); | 33 static bool ComputeDigest(const SkBitmap& bitmap, SkHashDigest *result); |
36 | 34 |
37 private: | 35 private: |
38 static bool ComputeDigestInternal(const SkBitmap& bitmap, SkHashDigest *resu
lt); | 36 static bool ComputeDigestInternal(const SkBitmap& bitmap, SkHashDigest *resu
lt); |
39 }; | 37 }; |
40 | 38 |
41 #endif | 39 #endif |
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