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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_libgif.h" | 8 #include "SkCodec_libgif.h" |
9 #include "SkCodecPriv.h" | 9 #include "SkCodecPriv.h" |
10 #include "SkColorPriv.h" | 10 #include "SkColorPriv.h" |
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23 memcmp(GIF87_STAMP, buf, GIF_STAMP_LEN) == 0 || | 23 memcmp(GIF87_STAMP, buf, GIF_STAMP_LEN) == 0 || |
24 memcmp(GIF89_STAMP, buf, GIF_STAMP_LEN) == 0) | 24 memcmp(GIF89_STAMP, buf, GIF_STAMP_LEN) == 0) |
25 { | 25 { |
26 return true; | 26 return true; |
27 } | 27 } |
28 } | 28 } |
29 return false; | 29 return false; |
30 } | 30 } |
31 | 31 |
32 /* | 32 /* |
33 * Warning reporting function | |
34 */ | |
35 static void gif_warning(const char* msg) { | |
36 SkCodecPrintf("Gif Warning: %s\n", msg); | |
37 } | |
38 | |
39 /* | |
40 * Error function | 33 * Error function |
41 */ | 34 */ |
42 static SkCodec::Result gif_error(const char* msg, SkCodec::Result result = SkCod
ec::kInvalidInput) { | 35 static SkCodec::Result gif_error(const char* msg, SkCodec::Result result = SkCod
ec::kInvalidInput) { |
43 SkCodecPrintf("Gif Error: %s\n", msg); | 36 SkCodecPrintf("Gif Error: %s\n", msg); |
44 return result; | 37 return result; |
45 } | 38 } |
46 | 39 |
47 | 40 |
48 /* | 41 /* |
49 * Read function that will be passed to gif_lib | 42 * Read function that will be passed to gif_lib |
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182 } | 175 } |
183 // If reading the image descriptor is successful, the image count will be | 176 // If reading the image descriptor is successful, the image count will be |
184 // incremented. | 177 // incremented. |
185 SkASSERT(gif->ImageCount >= 1); | 178 SkASSERT(gif->ImageCount >= 1); |
186 | 179 |
187 if (nullptr != codecOut) { | 180 if (nullptr != codecOut) { |
188 SkISize size; | 181 SkISize size; |
189 SkIRect frameRect; | 182 SkIRect frameRect; |
190 if (!GetDimensions(gif, &size, &frameRect)) { | 183 if (!GetDimensions(gif, &size, &frameRect)) { |
191 gif_error("Invalid gif size.\n"); | 184 gif_error("Invalid gif size.\n"); |
| 185 return false; |
192 } | 186 } |
193 bool frameIsSubset = (size != frameRect.size()); | 187 bool frameIsSubset = (size != frameRect.size()); |
194 | 188 |
195 // Determine the recommended alpha type. The transIndex might be valid
if it less | 189 // Determine the recommended alpha type. The transIndex might be valid
if it less |
196 // than 256. We are not certain that the index is valid until we proces
s the color | 190 // than 256. We are not certain that the index is valid until we proces
s the color |
197 // table, since some gifs have color tables with less than 256 colors.
If | 191 // table, since some gifs have color tables with less than 256 colors.
If |
198 // there might be a valid transparent index, we must indicate that the i
mage has | 192 // there might be a valid transparent index, we must indicate that the i
mage has |
199 // alpha. | 193 // alpha. |
200 // In the case where we must support alpha, we have the option to set th
e | 194 // In the case where we must support alpha, we have the option to set th
e |
201 // suggested alpha type to kPremul or kUnpremul. Both are valid since t
he alpha | 195 // suggested alpha type to kPremul or kUnpremul. Both are valid since t
he alpha |
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230 return codec; | 224 return codec; |
231 } | 225 } |
232 return nullptr; | 226 return nullptr; |
233 } | 227 } |
234 | 228 |
235 SkGifCodec::SkGifCodec(const SkImageInfo& srcInfo, SkStream* stream, GifFileType
* gif, | 229 SkGifCodec::SkGifCodec(const SkImageInfo& srcInfo, SkStream* stream, GifFileType
* gif, |
236 uint32_t transIndex, const SkIRect& frameRect, bool frameIsSubset) | 230 uint32_t transIndex, const SkIRect& frameRect, bool frameIsSubset) |
237 : INHERITED(srcInfo, stream) | 231 : INHERITED(srcInfo, stream) |
238 , fGif(gif) | 232 , fGif(gif) |
239 , fSrcBuffer(new uint8_t[this->getInfo().width()]) | 233 , fSrcBuffer(new uint8_t[this->getInfo().width()]) |
| 234 , fFrameRect(frameRect) |
240 // If it is valid, fTransIndex will be used to set fFillIndex. We don't kno
w if | 235 // If it is valid, fTransIndex will be used to set fFillIndex. We don't kno
w if |
241 // fTransIndex is valid until we process the color table, since fTransIndex
may | 236 // fTransIndex is valid until we process the color table, since fTransIndex
may |
242 // be greater than the size of the color table. | 237 // be greater than the size of the color table. |
243 , fTransIndex(transIndex) | 238 , fTransIndex(transIndex) |
244 // Default fFillIndex is 0. We will overwrite this if fTransIndex is valid,
or if | 239 // Default fFillIndex is 0. We will overwrite this if fTransIndex is valid,
or if |
245 // there is a valid background color. | 240 // there is a valid background color. |
246 , fFillIndex(0) | 241 , fFillIndex(0) |
247 , fFrameRect(frameRect) | |
248 , fFrameIsSubset(frameIsSubset) | 242 , fFrameIsSubset(frameIsSubset) |
| 243 , fSwizzler(NULL) |
249 , fColorTable(NULL) | 244 , fColorTable(NULL) |
250 , fSwizzler(NULL) | |
251 {} | 245 {} |
252 | 246 |
253 bool SkGifCodec::onRewind() { | 247 bool SkGifCodec::onRewind() { |
254 GifFileType* gifOut = nullptr; | 248 GifFileType* gifOut = nullptr; |
255 if (!ReadHeader(this->stream(), nullptr, &gifOut)) { | 249 if (!ReadHeader(this->stream(), nullptr, &gifOut)) { |
256 return false; | 250 return false; |
257 } | 251 } |
258 | 252 |
259 SkASSERT(nullptr != gifOut); | 253 SkASSERT(nullptr != gifOut); |
260 fGif.reset(gifOut); | 254 fGif.reset(gifOut); |
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587 | 581 |
588 int SkGifCodec::onOutputScanline(int inputScanline) const { | 582 int SkGifCodec::onOutputScanline(int inputScanline) const { |
589 if (fGif->Image.Interlace) { | 583 if (fGif->Image.Interlace) { |
590 if (inputScanline < fFrameRect.top() || inputScanline >= fFrameRect.bott
om()) { | 584 if (inputScanline < fFrameRect.top() || inputScanline >= fFrameRect.bott
om()) { |
591 return inputScanline; | 585 return inputScanline; |
592 } | 586 } |
593 return get_output_row_interlaced(inputScanline - fFrameRect.top(), fFram
eRect.height()); | 587 return get_output_row_interlaced(inputScanline - fFrameRect.top(), fFram
eRect.height()); |
594 } | 588 } |
595 return inputScanline; | 589 return inputScanline; |
596 } | 590 } |
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