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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 SkJpegCodec_DEFINED | 8 #ifndef SkJpegCodec_DEFINED |
9 #define SkJpegCodec_DEFINED | 9 #define SkJpegCodec_DEFINED |
10 | 10 |
11 #include "SkCodec.h" | 11 #include "SkCodec.h" |
12 #include "SkColorSpace.h" | 12 #include "SkColorSpace.h" |
13 #include "SkColorSpaceXform.h" | |
14 #include "SkImageInfo.h" | 13 #include "SkImageInfo.h" |
15 #include "SkSwizzler.h" | 14 #include "SkSwizzler.h" |
16 #include "SkStream.h" | 15 #include "SkStream.h" |
17 #include "SkTemplates.h" | 16 #include "SkTemplates.h" |
18 | 17 |
19 class JpegDecoderMgr; | 18 class JpegDecoderMgr; |
20 | 19 |
21 /* | 20 /* |
22 * | 21 * |
23 * This class implements the decoding for jpeg images | 22 * This class implements the decoding for jpeg images |
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93 * @param stream the encoded image data | 92 * @param stream the encoded image data |
94 * @param decoderMgr holds decompress struct, src manager, and error manager | 93 * @param decoderMgr holds decompress struct, src manager, and error manager |
95 * takes ownership | 94 * takes ownership |
96 */ | 95 */ |
97 SkJpegCodec(int width, int height, const SkEncodedInfo& info, SkStream* stre
am, | 96 SkJpegCodec(int width, int height, const SkEncodedInfo& info, SkStream* stre
am, |
98 JpegDecoderMgr* decoderMgr, sk_sp<SkColorSpace> colorSpace, Origin o
rigin, | 97 JpegDecoderMgr* decoderMgr, sk_sp<SkColorSpace> colorSpace, Origin o
rigin, |
99 sk_sp<SkData> iccData); | 98 sk_sp<SkData> iccData); |
100 | 99 |
101 /* | 100 /* |
102 * Checks if the conversion between the input image and the requested output | 101 * Checks if the conversion between the input image and the requested output |
103 * image has been implemented. | 102 * image has been implemented |
104 * | 103 * Sets the output color space |
105 * Sets the output color space. | |
106 */ | 104 */ |
107 bool setOutputColorSpace(const SkImageInfo& dst, bool needsColorXform); | 105 bool setOutputColorSpace(const SkImageInfo& dst); |
108 | 106 |
| 107 // scanline decoding |
109 void initializeSwizzler(const SkImageInfo& dstInfo, const Options& options); | 108 void initializeSwizzler(const SkImageInfo& dstInfo, const Options& options); |
110 bool initializeColorXform(const SkImageInfo& dstInfo, bool needsColorXform); | |
111 void allocateStorage(const SkImageInfo& dstInfo); | |
112 int readRows(const SkImageInfo& dstInfo, void* dst, size_t rowBytes, int cou
nt); | |
113 | |
114 /* | |
115 * Scanline decoding. | |
116 */ | |
117 SkSampler* getSampler(bool createIfNecessary) override; | 109 SkSampler* getSampler(bool createIfNecessary) override; |
118 Result onStartScanlineDecode(const SkImageInfo& dstInfo, const Options& opti
ons, | 110 Result onStartScanlineDecode(const SkImageInfo& dstInfo, const Options& opti
ons, |
119 SkPMColor ctable[], int* ctableCount) override; | 111 SkPMColor ctable[], int* ctableCount) override; |
120 int onGetScanlines(void* dst, int count, size_t rowBytes) override; | 112 int onGetScanlines(void* dst, int count, size_t rowBytes) override; |
121 bool onSkipScanlines(int count) override; | 113 bool onSkipScanlines(int count) override; |
122 | 114 |
123 SkAutoTDelete<JpegDecoderMgr> fDecoderMgr; | 115 SkAutoTDelete<JpegDecoderMgr> fDecoderMgr; |
124 | |
125 // We will save the state of the decompress struct after reading the header. | 116 // We will save the state of the decompress struct after reading the header. |
126 // This allows us to safely call onGetScaledDimensions() at any time. | 117 // This allows us to safely call onGetScaledDimensions() at any time. |
127 const int fReadyState; | 118 const int fReadyState; |
128 | 119 |
129 | 120 // scanline decoding |
130 SkAutoTMalloc<uint8_t> fStorage; | 121 SkAutoTMalloc<uint8_t> fStorage; // Only used if sampling is needed |
131 uint8_t* fSwizzleSrcRow; | 122 uint8_t* fSrcRow; // Only used if sampling is needed |
132 uint32_t* fColorXformSrcRow; | |
133 | |
134 // libjpeg-turbo provides some subsetting. In the case that libjpeg-turbo | 123 // libjpeg-turbo provides some subsetting. In the case that libjpeg-turbo |
135 // cannot take the exact the subset that we need, we will use the swizzler | 124 // cannot take the exact the subset that we need, we will use the swizzler |
136 // to further subset the output from libjpeg-turbo. | 125 // to further subset the output from libjpeg-turbo. |
137 SkIRect fSwizzlerSubset; | 126 SkIRect fSwizzlerSubset; |
138 | 127 SkAutoTDelete<SkSwizzler> fSwizzler; |
139 SkAutoTDelete<SkSwizzler> fSwizzler; | |
140 std::unique_ptr<SkColorSpaceXform> fColorXform; | |
141 | 128 |
142 sk_sp<SkData> fICCData; | 129 sk_sp<SkData> fICCData; |
143 | 130 |
144 typedef SkCodec INHERITED; | 131 typedef SkCodec INHERITED; |
145 }; | 132 }; |
146 | 133 |
147 #endif | 134 #endif |
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