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1 /* | 1 /* |
2 * Copyright 2015 Google Inc. | 2 * Copyright 2015 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #ifndef SkScanlineDecoder_DEFINED | 8 #ifndef SkScanlineDecoder_DEFINED |
9 #define SkScanlineDecoder_DEFINED | 9 #define SkScanlineDecoder_DEFINED |
10 | 10 |
11 #include "SkTypes.h" | 11 #include "SkTypes.h" |
12 #include "SkCodec.h" | 12 #include "SkCodec.h" |
13 #include "SkTemplates.h" | 13 #include "SkTemplates.h" |
14 #include "SkImageInfo.h" | 14 #include "SkImageInfo.h" |
15 | 15 |
16 class SkScanlineDecoder : public SkNoncopyable { | 16 class SkScanlineDecoder : public SkNoncopyable { |
17 public: | 17 public: |
18 /** | 18 /** |
19 * Clean up after reading/skipping scanlines. | 19 * Clean up after reading/skipping scanlines. |
20 * | 20 * |
21 * It is possible that not all scanlines will have been read/skipped. In | 21 * It is possible that not all scanlines will have been read/skipped. In |
22 * fact, in the case of subset decodes, it is likely that there will be | 22 * fact, in the case of subset decodes, it is likely that there will be |
23 * scanlines at the bottom of the image that have been ignored. | 23 * scanlines at the bottom of the image that have been ignored. |
24 * | |
25 * Note for implementations: An SkScanlineDecoder will be deleted by (and | |
26 * therefore *before*) its associated SkCodec, in case the order matters. | |
27 * However, while the SkCodec base class maintains ownership of the | |
28 * SkScanlineDecoder, the subclass will be deleted before the scanline | |
29 * decoder. If this is an issue, detachScanlineDecoder() provides | |
30 * a means for the subclass to take ownership of the SkScanlineDecoder. | |
31 */ | 24 */ |
32 virtual ~SkScanlineDecoder() {} | 25 virtual ~SkScanlineDecoder() {} |
33 | 26 |
34 /** | 27 /** |
35 * Write the next countLines scanlines into dst. | 28 * Write the next countLines scanlines into dst. |
36 * | 29 * |
37 * @param dst Must be non-null, and large enough to hold countLines | 30 * @param dst Must be non-null, and large enough to hold countLines |
38 * scanlines of size rowBytes. | 31 * scanlines of size rowBytes. |
39 * @param countLines Number of lines to write. | 32 * @param countLines Number of lines to write. |
40 * @param rowBytes Number of bytes per row. Must be large enough to hold | 33 * @param rowBytes Number of bytes per row. Must be large enough to hold |
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104 // Calling the virtual method also means we do not double count | 97 // Calling the virtual method also means we do not double count |
105 // countLines. | 98 // countLines. |
106 return this->onGetScanlines(storage.get(), countLines, 0); | 99 return this->onGetScanlines(storage.get(), countLines, 0); |
107 } | 100 } |
108 | 101 |
109 virtual SkCodec::Result onGetScanlines(void* dst, int countLines, | 102 virtual SkCodec::Result onGetScanlines(void* dst, int countLines, |
110 size_t rowBytes) = 0; | 103 size_t rowBytes) = 0; |
111 | 104 |
112 }; | 105 }; |
113 #endif // SkScanlineDecoder_DEFINED | 106 #endif // SkScanlineDecoder_DEFINED |
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