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1 /* | 1 /* |
2 * Copyright 2006 The Android Open Source Project | 2 * Copyright 2006 The Android Open Source Project |
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 "SkImageDecoder_libgif.h" |
| 9 |
8 #include "SkColor.h" | 10 #include "SkColor.h" |
9 #include "SkColorPriv.h" | 11 #include "SkColorPriv.h" |
10 #include "SkColorTable.h" | 12 #include "SkColorTable.h" |
11 #include "SkImageDecoder.h" | |
12 #include "SkRTConf.h" | 13 #include "SkRTConf.h" |
13 #include "SkScaledBitmapSampler.h" | 14 #include "SkScaledBitmapSampler.h" |
14 #include "SkStream.h" | 15 #include "SkStream.h" |
15 #include "SkTemplates.h" | 16 #include "SkTemplates.h" |
16 #include "SkUtils.h" | 17 #include "SkUtils.h" |
17 | 18 |
18 #include "gif_lib.h" | 19 #include "gif_lib.h" |
19 | 20 |
20 class SkGIFImageDecoder : public SkImageDecoder { | 21 class SkGIFImageDecoder : public SkImageDecoder { |
21 public: | 22 public: |
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494 | 495 |
495 default: /* Should be trapped by DGifGetRecordType */ | 496 default: /* Should be trapped by DGifGetRecordType */ |
496 break; | 497 break; |
497 } | 498 } |
498 } while (recType != TERMINATE_RECORD_TYPE); | 499 } while (recType != TERMINATE_RECORD_TYPE); |
499 | 500 |
500 sanitize_indexed_bitmap(bm); | 501 sanitize_indexed_bitmap(bm); |
501 return true; | 502 return true; |
502 } | 503 } |
503 | 504 |
504 /////////////////////////////////////////////////////////////////////////////// | 505 SkImageDecoder::Format SkDetectFormatGIFImageDecoder(SkStreamRewindable* stream)
{ |
505 DEFINE_DECODER_CREATOR(GIFImageDecoder); | |
506 /////////////////////////////////////////////////////////////////////////////// | |
507 | |
508 static bool is_gif(SkStreamRewindable* stream) { | |
509 char buf[GIF_STAMP_LEN]; | 506 char buf[GIF_STAMP_LEN]; |
510 if (stream->read(buf, GIF_STAMP_LEN) == GIF_STAMP_LEN) { | 507 if (stream->read(buf, GIF_STAMP_LEN) == GIF_STAMP_LEN) { |
511 if (memcmp(GIF_STAMP, buf, GIF_STAMP_LEN) == 0 || | 508 if (memcmp(GIF_STAMP, buf, GIF_STAMP_LEN) == 0 || |
512 memcmp(GIF87_STAMP, buf, GIF_STAMP_LEN) == 0 || | 509 memcmp(GIF87_STAMP, buf, GIF_STAMP_LEN) == 0 || |
513 memcmp(GIF89_STAMP, buf, GIF_STAMP_LEN) == 0) { | 510 memcmp(GIF89_STAMP, buf, GIF_STAMP_LEN) == 0) { |
514 return true; | 511 return SkImageDecoder::kGIF_Format; |
515 } | 512 } |
516 } | 513 } |
517 return false; | 514 return SkImageDecoder::kUnknown_Format; |
518 } | 515 } |
519 | 516 |
520 static SkImageDecoder* sk_libgif_dfactory(SkStreamRewindable* stream) { | 517 SkImageDecoder* SkCreateGIFImageDecoder(SkStreamRewindable* stream) { |
521 if (is_gif(stream)) { | 518 if (SkDetectFormatGIFImageDecoder(stream) == SkImageDecoder::kGIF_Format) { |
522 return SkNEW(SkGIFImageDecoder); | 519 return SkNEW(SkGIFImageDecoder); |
523 } | 520 } |
524 return NULL; | 521 return NULL; |
525 } | 522 } |
526 | |
527 static SkImageDecoder_DecodeReg gReg(sk_libgif_dfactory); | |
528 | |
529 static SkImageDecoder::Format get_format_gif(SkStreamRewindable* stream) { | |
530 if (is_gif(stream)) { | |
531 return SkImageDecoder::kGIF_Format; | |
532 } | |
533 return SkImageDecoder::kUnknown_Format; | |
534 } | |
535 | |
536 static SkImageDecoder_FormatReg gFormatReg(get_format_gif); | |
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