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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 #include "SkCodec.h" | 8 #include "SkCodec.h" |
9 #include "SkColorTable.h" | 9 #include "SkColorTable.h" |
| 10 #include "SkEncodedFormat.h" |
10 #include "SkImageInfo.h" | 11 #include "SkImageInfo.h" |
11 #include "SkMaskSwizzler.h" | 12 #include "SkMaskSwizzler.h" |
12 #include "SkStream.h" | 13 #include "SkStream.h" |
13 #include "SkSwizzler.h" | 14 #include "SkSwizzler.h" |
14 #include "SkTypes.h" | 15 #include "SkTypes.h" |
15 | 16 |
16 // TODO: rename SkCodec_libbmp files to SkBmpCodec | 17 // TODO: rename SkCodec_libbmp files to SkBmpCodec |
17 // TODO: define a wrapper for SkDebugf that doesn't always print | 18 // TODO: define a wrapper for SkDebugf that doesn't always print |
18 /* | 19 /* |
19 * | 20 * |
20 * This class implements the decoding for bmp images | 21 * This class implements the decoding for bmp images |
21 * | 22 * |
22 */ | 23 */ |
23 class SkBmpCodec : public SkCodec { | 24 class SkBmpCodec : public SkCodec { |
24 public: | 25 public: |
25 | 26 |
26 /* | 27 /* |
27 * | 28 * |
28 * Describes if rows of the input start at the top or bottom of the image | 29 * Describes if rows of the input start at the top or bottom of the image |
29 * | 30 * |
30 */ | 31 */ |
31 enum RowOrder { | 32 enum RowOrder { |
32 kTopDown_RowOrder, | 33 kTopDown_RowOrder, |
33 kBottomUp_RowOrder | 34 kBottomUp_RowOrder |
34 }; | 35 }; |
35 | 36 |
36 /* | 37 /* |
37 * | 38 * |
38 * Checks the start of the stream to see if the image is a bmp | 39 * Checks the start of the stream to see if the image is a bitmap |
39 * | 40 * |
40 */ | 41 */ |
41 static bool IsBmp(SkStream*); | 42 static bool IsBmp(SkStream*); |
42 | 43 |
43 /* | 44 /* |
44 * | 45 * |
45 * Assumes IsBmp was called and returned true | 46 * Assumes IsBmp was called and returned true |
46 * Creates a bmp decoder | 47 * Creates a bitmap decoder |
47 * Reads enough of the stream to determine the image format | 48 * Reads enough of the stream to determine the image format |
48 * | 49 * |
49 */ | 50 */ |
50 static SkCodec* NewFromStream(SkStream*); | 51 static SkCodec* NewFromStream(SkStream*); |
51 | 52 |
52 /* | |
53 * | |
54 * Creates a bmp decoder for a bmp embedded in ico | |
55 * Reads enough of the stream to determine the image format | |
56 * | |
57 */ | |
58 static SkCodec* NewFromIco(SkStream*); | |
59 | |
60 protected: | 53 protected: |
61 | 54 |
62 /* | 55 /* |
63 * | 56 * |
64 * Initiates the bmp decode | 57 * Initiates the bitmap decode |
65 * | 58 * |
66 */ | 59 */ |
67 virtual Result onGetPixels(const SkImageInfo& dstInfo, void* dst, | 60 virtual Result onGetPixels(const SkImageInfo& dstInfo, void* dst, |
68 size_t dstRowBytes, const Options&, SkPMColor*, | 61 size_t dstRowBytes, const Options&, SkPMColor*, |
69 int*) SK_OVERRIDE; | 62 int*) SK_OVERRIDE; |
70 | 63 |
71 SkEncodedFormat onGetEncodedFormat() const SK_OVERRIDE { return kBMP_SkEncod
edFormat; } | 64 SkEncodedFormat onGetEncodedFormat() const SK_OVERRIDE { return kBMP_SkEncod
edFormat; } |
72 | |
73 private: | 65 private: |
74 | 66 |
75 /* | 67 /* |
76 * | 68 * |
77 * Used to define the input format of the bmp | 69 * Used to define the input format of the bitmap |
78 * | 70 * |
79 */ | 71 */ |
80 enum BitmapInputFormat { | 72 enum BitmapInputFormat { |
81 kStandard_BitmapInputFormat, | 73 kStandard_BitmapInputFormat, |
82 kRLE_BitmapInputFormat, | 74 kRLE_BitmapInputFormat, |
83 kBitMask_BitmapInputFormat, | 75 kBitMask_BitmapInputFormat, |
84 kUnknown_BitmapInputFormat | 76 kUnknown_BitmapInputFormat |
85 }; | 77 }; |
86 | 78 |
87 /* | 79 /* |
88 * | 80 * |
89 * Creates the color table | 81 * Creates the color table |
90 * | 82 * |
91 */ | 83 */ |
92 bool createColorTable(SkAlphaType alphaType); | 84 bool createColorTable(SkAlphaType alphaType); |
93 | 85 |
94 /* | 86 /* |
95 * | 87 * |
96 * Creates a bmp decoder | |
97 * Reads enough of the stream to determine the image format | |
98 * | |
99 */ | |
100 static SkCodec* NewFromStream(SkStream*, bool isIco); | |
101 | |
102 /* | |
103 * | |
104 * Performs the bitmap decoding for bit masks input format | 88 * Performs the bitmap decoding for bit masks input format |
105 * | 89 * |
106 */ | 90 */ |
107 Result decodeMask(const SkImageInfo& dstInfo, void* dst, | 91 Result decodeMask(const SkImageInfo& dstInfo, void* dst, |
108 size_t dstRowBytes); | 92 size_t dstRowBytes); |
109 | 93 |
110 /* | 94 /* |
111 * | 95 * |
112 * Set an RLE pixel using the color table | 96 * Set an RLE pixel using the color table |
113 * | 97 * |
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158 * @param rowOrder indicates whether rows are ordered top-down or bottom-up | 142 * @param rowOrder indicates whether rows are ordered top-down or bottom-up |
159 * @param RLEBytes used only for RLE decodes, as we must decode all | 143 * @param RLEBytes used only for RLE decodes, as we must decode all |
160 * of the data at once rather than row by row | 144 * of the data at once rather than row by row |
161 * it indicates the amount of data left in the stream | 145 * it indicates the amount of data left in the stream |
162 * after decoding the headers | 146 * after decoding the headers |
163 * | 147 * |
164 */ | 148 */ |
165 SkBmpCodec(const SkImageInfo& srcInfo, SkStream* stream, | 149 SkBmpCodec(const SkImageInfo& srcInfo, SkStream* stream, |
166 uint16_t bitsPerPixel, BitmapInputFormat format, | 150 uint16_t bitsPerPixel, BitmapInputFormat format, |
167 SkMasks* masks, uint32_t numColors, uint32_t bytesPerColor, | 151 SkMasks* masks, uint32_t numColors, uint32_t bytesPerColor, |
168 uint32_t offset, RowOrder rowOrder, size_t RLEBytes, | 152 uint32_t offset, RowOrder rowOrder, size_t RLEByes); |
169 bool isIco); | |
170 | 153 |
171 // Fields | 154 // Fields |
172 const uint16_t fBitsPerPixel; | 155 const uint16_t fBitsPerPixel; |
173 const BitmapInputFormat fInputFormat; | 156 const BitmapInputFormat fInputFormat; |
174 SkAutoTDelete<SkMasks> fMasks; // owned | 157 SkAutoTDelete<SkMasks> fMasks; // owned |
175 SkAutoTDelete<SkColorTable> fColorTable; // owned | 158 SkAutoTDelete<SkColorTable> fColorTable; // owned |
176 uint32_t fNumColors; | 159 uint32_t fNumColors; |
177 const uint32_t fBytesPerColor; | 160 const uint32_t fBytesPerColor; |
178 const uint32_t fOffset; | 161 const uint32_t fOffset; |
179 const RowOrder fRowOrder; | 162 const RowOrder fRowOrder; |
180 const size_t fRLEBytes; | 163 const size_t fRLEBytes; |
181 const bool fIsIco; | |
182 | 164 |
183 typedef SkCodec INHERITED; | 165 typedef SkCodec INHERITED; |
184 }; | 166 }; |
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