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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 SkCodec_DEFINED | 8 #ifndef SkCodec_DEFINED |
9 #define SkCodec_DEFINED | 9 #define SkCodec_DEFINED |
10 | 10 |
| 11 #include "SkEncodedFormat.h" |
11 #include "SkImageGenerator.h" | 12 #include "SkImageGenerator.h" |
12 #include "SkImageInfo.h" | 13 #include "SkImageInfo.h" |
13 #include "SkSize.h" | 14 #include "SkSize.h" |
14 #include "SkStream.h" | 15 #include "SkStream.h" |
15 #include "SkTemplates.h" | 16 #include "SkTemplates.h" |
16 #include "SkTypes.h" | 17 #include "SkTypes.h" |
17 | 18 |
18 class SkData; | 19 class SkData; |
19 | 20 |
20 /** | 21 /** |
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43 * Return a size that approximately supports the desired scale factor. | 44 * Return a size that approximately supports the desired scale factor. |
44 * The codec may not be able to scale efficiently to the exact scale | 45 * The codec may not be able to scale efficiently to the exact scale |
45 * factor requested, so return a size that approximates that scale. | 46 * factor requested, so return a size that approximates that scale. |
46 * | 47 * |
47 * FIXME: Move to SkImageGenerator? | 48 * FIXME: Move to SkImageGenerator? |
48 */ | 49 */ |
49 SkISize getScaledDimensions(float desiredScale) const { | 50 SkISize getScaledDimensions(float desiredScale) const { |
50 return this->onGetScaledDimensions(desiredScale); | 51 return this->onGetScaledDimensions(desiredScale); |
51 } | 52 } |
52 | 53 |
| 54 /** |
| 55 * Format of the encoded data. |
| 56 */ |
| 57 SkEncodedFormat getEncodedFormat() const { return this->onGetEncodedFormat()
; } |
| 58 |
53 protected: | 59 protected: |
54 SkCodec(const SkImageInfo&, SkStream*); | 60 SkCodec(const SkImageInfo&, SkStream*); |
55 | 61 |
56 /** | 62 /** |
57 * The SkAlphaType is a conservative answer. i.e. it is possible that it | 63 * The SkAlphaType is a conservative answer. i.e. it is possible that it |
58 * initially returns a non-opaque answer, but completing the decode | 64 * initially returns a non-opaque answer, but completing the decode |
59 * reveals that the image is actually opaque. | 65 * reveals that the image is actually opaque. |
60 */ | 66 */ |
61 #ifdef SK_SUPPORT_LEGACY_BOOL_ONGETINFO | 67 #ifdef SK_SUPPORT_LEGACY_BOOL_ONGETINFO |
62 bool onGetInfo(SkImageInfo* info) SK_OVERRIDE { | 68 bool onGetInfo(SkImageInfo* info) SK_OVERRIDE { |
63 *info = fInfo; | 69 *info = fInfo; |
64 return true; | 70 return true; |
65 } | 71 } |
66 #endif | 72 #endif |
67 | 73 |
68 // Helper for subclasses. | 74 // Helper for subclasses. |
69 const SkImageInfo& getOriginalInfo() { return fInfo; } | 75 const SkImageInfo& getOriginalInfo() { return fInfo; } |
70 | 76 |
71 virtual SkISize onGetScaledDimensions(float /* desiredScale */) const { | 77 virtual SkISize onGetScaledDimensions(float /* desiredScale */) const { |
72 // By default, scaling is not supported. | 78 // By default, scaling is not supported. |
73 return fInfo.dimensions(); | 79 return fInfo.dimensions(); |
74 } | 80 } |
75 | 81 |
| 82 virtual SkEncodedFormat onGetEncodedFormat() const = 0; |
| 83 |
76 /** | 84 /** |
77 * If the stream was previously read, attempt to rewind. | 85 * If the stream was previously read, attempt to rewind. |
78 * @returns: | 86 * @returns: |
79 * true | 87 * true |
80 * - if the stream needed to be rewound, and the rewind | 88 * - if the stream needed to be rewound, and the rewind |
81 * succeeded. | 89 * succeeded. |
82 * - if the stream did not need to be rewound. | 90 * - if the stream did not need to be rewound. |
83 * false | 91 * false |
84 * - if the stream needed to be rewound, and rewind failed. | 92 * - if the stream needed to be rewound, and rewind failed. |
85 * Subclasses MUST call this function before reading the stream (e.g. in | 93 * Subclasses MUST call this function before reading the stream (e.g. in |
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98 } | 106 } |
99 | 107 |
100 private: | 108 private: |
101 const SkImageInfo fInfo; | 109 const SkImageInfo fInfo; |
102 SkAutoTDelete<SkStream> fStream; | 110 SkAutoTDelete<SkStream> fStream; |
103 bool fNeedsRewind; | 111 bool fNeedsRewind; |
104 | 112 |
105 typedef SkImageGenerator INHERITED; | 113 typedef SkImageGenerator INHERITED; |
106 }; | 114 }; |
107 #endif // SkCodec_DEFINED | 115 #endif // SkCodec_DEFINED |
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