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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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163 // Many gifs specify a color table index for transparent pixels. Every | 163 // Many gifs specify a color table index for transparent pixels. Every |
164 // other pixel is guaranteed to be opaque. Despite this, because of the | 164 // other pixel is guaranteed to be opaque. Despite this, because of the |
165 // possiblity of transparent pixels, we cannot assume that the image is | 165 // possiblity of transparent pixels, we cannot assume that the image is |
166 // opaque. We have the option to set the alpha type as kPremul or | 166 // opaque. We have the option to set the alpha type as kPremul or |
167 // kUnpremul. Both are valid since the alpha component will always be | 167 // kUnpremul. Both are valid since the alpha component will always be |
168 // 0xFF or the entire 32-bit pixel will be set to zero. We prefer | 168 // 0xFF or the entire 32-bit pixel will be set to zero. We prefer |
169 // kPremul because we support kPremul, and it is more efficient to | 169 // kPremul because we support kPremul, and it is more efficient to |
170 // use kPremul directly even when kUnpremul is supported. | 170 // use kPremul directly even when kUnpremul is supported. |
171 const SkImageInfo& imageInfo = SkImageInfo::Make(width, height, | 171 const SkImageInfo& imageInfo = SkImageInfo::Make(width, height, |
172 kIndex_8_SkColorType, kPremul_SkAlphaType); | 172 kIndex_8_SkColorType, kPremul_SkAlphaType); |
173 *codecOut = SkNEW_ARGS(SkGifCodec, (imageInfo, streamDeleter.detach(), g
if.detach())); | 173 *codecOut = new SkGifCodec(imageInfo, streamDeleter.detach(), gif.detach
()); |
174 } else { | 174 } else { |
175 SkASSERT(NULL != gifOut); | 175 SkASSERT(NULL != gifOut); |
176 streamDeleter.detach(); | 176 streamDeleter.detach(); |
177 *gifOut = gif.detach(); | 177 *gifOut = gif.detach(); |
178 } | 178 } |
179 return true; | 179 return true; |
180 } | 180 } |
181 | 181 |
182 /* | 182 /* |
183 * Assumes IsGif was called and returned true | 183 * Assumes IsGif was called and returned true |
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408 SkSwizzler::kIndex, colorTable, subsetDstInfo, | 408 SkSwizzler::kIndex, colorTable, subsetDstInfo, |
409 zeroInit, this->getInfo())); | 409 zeroInit, this->getInfo())); |
410 } else { | 410 } else { |
411 // Create the fully dimensional swizzler | 411 // Create the fully dimensional swizzler |
412 swizzler.reset(SkSwizzler::CreateSwizzler( | 412 swizzler.reset(SkSwizzler::CreateSwizzler( |
413 SkSwizzler::kIndex, colorTable, dstInfo, | 413 SkSwizzler::kIndex, colorTable, dstInfo, |
414 zeroInit, this->getInfo())); | 414 zeroInit, this->getInfo())); |
415 } | 415 } |
416 | 416 |
417 // Stores output from dgiflib and input to the swizzler | 417 // Stores output from dgiflib and input to the swizzler |
418 SkAutoTDeleteArray<uint8_t> | 418 SkAutoTDeleteArray<uint8_t> buffer(new uint8_t[innerWidth]); |
419 buffer(SkNEW_ARRAY(uint8_t, innerWidth)); | |
420 | 419 |
421 // Check the interlace flag and iterate over rows of the input | 420 // Check the interlace flag and iterate over rows of the input |
422 if (fGif->Image.Interlace) { | 421 if (fGif->Image.Interlace) { |
423 // In interlace mode, the rows of input are rearranged in | 422 // In interlace mode, the rows of input are rearranged in |
424 // the output image. We use an iterator to take care of | 423 // the output image. We use an iterator to take care of |
425 // the rearranging. | 424 // the rearranging. |
426 SkGifInterlaceIter iter(innerHeight); | 425 SkGifInterlaceIter iter(innerHeight); |
427 for (int32_t y = 0; y < innerHeight; y++) { | 426 for (int32_t y = 0; y < innerHeight; y++) { |
428 if (GIF_ERROR == DGifGetLine(fGif, buffer.get(), | 427 if (GIF_ERROR == DGifGetLine(fGif, buffer.get(), |
429 innerWidth)) { | 428 innerWidth)) { |
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523 // giflib returns an error code if the record type is not known. | 522 // giflib returns an error code if the record type is not known. |
524 // We should catch this error immediately. | 523 // We should catch this error immediately. |
525 SkASSERT(false); | 524 SkASSERT(false); |
526 break; | 525 break; |
527 } | 526 } |
528 } while (TERMINATE_RECORD_TYPE != recordType); | 527 } while (TERMINATE_RECORD_TYPE != recordType); |
529 | 528 |
530 return gif_error("Could not find any images to decode in gif file.\n", | 529 return gif_error("Could not find any images to decode in gif file.\n", |
531 kInvalidInput); | 530 kInvalidInput); |
532 } | 531 } |
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