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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 "SkData.h" | 9 #include "SkData.h" |
10 #include "SkCodec_libbmp.h" | |
11 #include "SkCodec_libpng.h" | 10 #include "SkCodec_libpng.h" |
12 #include "SkStream.h" | 11 #include "SkStream.h" |
13 | 12 |
14 struct DecoderProc { | |
15 bool (*IsFormat)(SkStream*); | |
16 SkCodec* (*NewFromStream)(SkStream*); | |
17 }; | |
18 | |
19 static const DecoderProc gDecoderProcs[] = { | |
20 { SkPngCodec::IsPng, SkPngCodec::NewFromStream }, | |
21 { SkBmpCodec::IsBmp, SkBmpCodec::NewFromStream } | |
22 }; | |
23 | |
24 SkCodec* SkCodec::NewFromStream(SkStream* stream) { | 13 SkCodec* SkCodec::NewFromStream(SkStream* stream) { |
25 if (!stream) { | 14 if (!stream) { |
26 return NULL; | 15 return NULL; |
27 } | 16 } |
28 for (DecoderProc proc : gDecoderProcs) { | 17 SkAutoTDelete<SkStream> streamDeleter(stream); |
29 const bool correctFormat = proc.IsFormat(stream); | 18 const bool isPng = SkPngCodec::IsPng(stream); |
30 if (!stream->rewind()) { | 19 // TODO: Avoid rewinding. |
31 return NULL; | 20 if (!stream->rewind()) { |
32 } | 21 return NULL; |
33 if (correctFormat) { | |
34 return proc.NewFromStream(stream); | |
35 } | |
36 } | 22 } |
| 23 if (isPng) { |
| 24 streamDeleter.detach(); |
| 25 return SkPngCodec::NewFromStream(stream); |
| 26 } |
| 27 // TODO: Check other image types. |
37 return NULL; | 28 return NULL; |
38 } | 29 } |
39 | 30 |
40 SkCodec* SkCodec::NewFromData(SkData* data) { | 31 SkCodec* SkCodec::NewFromData(SkData* data) { |
41 if (!data) { | 32 if (!data) { |
42 return NULL; | 33 return NULL; |
43 } | 34 } |
44 return NewFromStream(SkNEW_ARGS(SkMemoryStream, (data))); | 35 return NewFromStream(SkNEW_ARGS(SkMemoryStream, (data))); |
45 } | 36 } |
46 | 37 |
47 SkCodec::SkCodec(const SkImageInfo& info, SkStream* stream) | 38 SkCodec::SkCodec(const SkImageInfo& info, SkStream* stream) |
48 : fInfo(info) | 39 : fInfo(info) |
49 , fStream(stream) | 40 , fStream(stream) |
50 , fNeedsRewind(false) | 41 , fNeedsRewind(false) |
51 {} | 42 {} |
52 | 43 |
53 bool SkCodec::rewindIfNeeded() { | 44 bool SkCodec::rewindIfNeeded() { |
54 // Store the value of fNeedsRewind so we can update it. Next read will | 45 // Store the value of fNeedsRewind so we can update it. Next read will |
55 // require a rewind. | 46 // require a rewind. |
56 const bool neededRewind = fNeedsRewind; | 47 const bool neededRewind = fNeedsRewind; |
57 fNeedsRewind = true; | 48 fNeedsRewind = true; |
58 return !neededRewind || fStream->rewind(); | 49 return !neededRewind || fStream->rewind(); |
59 } | 50 } |
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