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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 #include "SkBitmap.h" | 9 #include "SkBitmap.h" |
10 #include "SkBitmapChecksummer.h" | 10 #include "SkBitmapHasher.h" |
11 #include "SkBitmapTransformer.h" | 11 #include "SkBitmapTransformer.h" |
12 #include "SkCityHash.h" | 12 #include "SkCityHash.h" |
13 #include "SkEndian.h" | 13 #include "SkEndian.h" |
14 | 14 |
15 /** | 15 /** |
16 * Write an integer value into a bytebuffer in little-endian order. | 16 * Write an integer value into a bytebuffer in little-endian order. |
17 */ | 17 */ |
18 static void write_int_to_buffer(int val, char* buf) { | 18 static void write_int_to_buffer(int val, char* buf) { |
19 val = SkEndian_SwapLE32(val); | 19 val = SkEndian_SwapLE32(val); |
20 for (int byte=0; byte<4; byte++) { | 20 for (int byte=0; byte<4; byte++) { |
21 *buf++ = (char)(val & 0xff); | 21 *buf++ = (char)(val & 0xff); |
22 val = val >> 8; | 22 val = val >> 8; |
23 } | 23 } |
24 } | 24 } |
25 | 25 |
26 /*static*/ uint64_t SkBitmapChecksummer::Compute64Internal( | 26 /*static*/ bool SkBitmapHasher::ComputeDigestInternal( |
27 const SkBitmap& bitmap, const SkBitmapTransformer& transformer) { | 27 const SkBitmap& bitmap, const SkBitmapTransformer& transformer, SkHashDi
gest *result) { |
28 size_t pixelBufferSize = transformer.bytesNeededTotal(); | 28 size_t pixelBufferSize = transformer.bytesNeededTotal(); |
29 size_t totalBufferSize = pixelBufferSize + 8; // leave room for x/y dimensio
ns | 29 size_t totalBufferSize = pixelBufferSize + 8; // leave room for x/y dimensio
ns |
30 | 30 |
31 SkAutoMalloc bufferManager(totalBufferSize); | 31 SkAutoMalloc bufferManager(totalBufferSize); |
32 char *bufferStart = static_cast<char *>(bufferManager.get()); | 32 char *bufferStart = static_cast<char *>(bufferManager.get()); |
33 char *bufPtr = bufferStart; | 33 char *bufPtr = bufferStart; |
34 // start with the x/y dimensions | 34 // start with the x/y dimensions |
35 write_int_to_buffer(bitmap.width(), bufPtr); | 35 write_int_to_buffer(bitmap.width(), bufPtr); |
36 bufPtr += 4; | 36 bufPtr += 4; |
37 write_int_to_buffer(bitmap.height(), bufPtr); | 37 write_int_to_buffer(bitmap.height(), bufPtr); |
38 bufPtr += 4; | 38 bufPtr += 4; |
39 | 39 |
40 // add all the pixel data | 40 // add all the pixel data |
41 if (!transformer.copyBitmapToPixelBuffer(bufPtr, pixelBufferSize)) { | 41 if (!transformer.copyBitmapToPixelBuffer(bufPtr, pixelBufferSize)) { |
42 return 0; | 42 return false; |
43 } | 43 } |
44 return SkCityHash::Compute64(bufferStart, totalBufferSize); | 44 *result = SkCityHash::Compute64(bufferStart, totalBufferSize); |
| 45 return true; |
45 } | 46 } |
46 | 47 |
47 /*static*/ uint64_t SkBitmapChecksummer::Compute64(const SkBitmap& bitmap) { | 48 /*static*/ bool SkBitmapHasher::ComputeDigest(const SkBitmap& bitmap, SkHashDige
st *result) { |
48 const SkBitmapTransformer::PixelFormat kPixelFormat = | 49 const SkBitmapTransformer::PixelFormat kPixelFormat = |
49 SkBitmapTransformer::kARGB_8888_Premul_PixelFormat; | 50 SkBitmapTransformer::kARGB_8888_Premul_PixelFormat; |
50 | 51 |
51 // First, try to transform the existing bitmap. | 52 // First, try to transform the existing bitmap. |
52 const SkBitmapTransformer transformer = | 53 const SkBitmapTransformer transformer = |
53 SkBitmapTransformer(bitmap, kPixelFormat); | 54 SkBitmapTransformer(bitmap, kPixelFormat); |
54 if (transformer.isValid(false)) { | 55 if (transformer.isValid(false)) { |
55 return Compute64Internal(bitmap, transformer); | 56 return ComputeDigestInternal(bitmap, transformer, result); |
56 } | 57 } |
57 | 58 |
58 // Hmm, that didn't work. Maybe if we create a new | 59 // Hmm, that didn't work. Maybe if we create a new |
59 // kARGB_8888_Config version of the bitmap it will work better? | 60 // kARGB_8888_Config version of the bitmap it will work better? |
60 SkBitmap copyBitmap; | 61 SkBitmap copyBitmap; |
61 bitmap.copyTo(©Bitmap, SkBitmap::kARGB_8888_Config); | 62 bitmap.copyTo(©Bitmap, SkBitmap::kARGB_8888_Config); |
62 const SkBitmapTransformer copyTransformer = | 63 const SkBitmapTransformer copyTransformer = |
63 SkBitmapTransformer(copyBitmap, kPixelFormat); | 64 SkBitmapTransformer(copyBitmap, kPixelFormat); |
64 if (copyTransformer.isValid(true)) { | 65 if (copyTransformer.isValid(true)) { |
65 return Compute64Internal(copyBitmap, copyTransformer); | 66 return ComputeDigestInternal(copyBitmap, copyTransformer, result); |
66 } else { | 67 } else { |
67 return 0; | 68 return false; |
68 } | 69 } |
69 } | 70 } |
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