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1 /* | |
2 * Copyright 2013 Google Inc. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 #ifndef SkImageGenerator_DEFINED | |
9 #define SkImageGenerator_DEFINED | |
10 | |
11 #include "SkImageInfo.h" | |
12 | |
13 class SkData; | |
14 | |
15 /** | |
16 * An interface that allows a purgable PixelRef to re-decode an image. | |
17 */ | |
18 class SkImageGenerator { | |
19 public: | |
20 virtual ~SkImageGenerator() { } | |
21 | |
22 /** | |
23 * Return a ref to the encoded (i.e. compressed) representation, | |
24 * of this data. | |
25 * | |
26 * If non-NULL is returned, the caller is responsible for calling | |
27 * unref() on the data when it is finished. | |
28 */ | |
29 virtual SkData* refEncodedData() { return NULL; } | |
30 | |
31 /** | |
32 * Return some information about the image, allowing the owner fo | |
scroggo
2013/11/19 22:19:27
of*
hal.canary
2013/11/20 00:07:10
Done.
| |
33 * this ojbect to allocate pixels. | |
scroggo
2013/11/19 22:19:27
object*
hal.canary
2013/11/20 00:07:10
Done.
| |
34 * | |
35 * @return false if anything goes wrong. | |
36 */ | |
37 virtual bool getInfo(SkImageInfo* info) = 0; | |
38 | |
39 /** | |
40 * Decode into the given pixels, a block of memory of size at | |
41 * least (info.fHeight - 1) * rowBytes + (info.fWidth * | |
42 * bytesPerPixel) | |
43 * | |
44 * @param info Should be identical to the info returned by | |
45 * getInfo so that the implementation can confirm that the | |
46 * caller knows what it is asking for (config, size). | |
47 * This contract also allows the caller to specify | |
48 * different output-configs, which the implementation can | |
49 * decide to support or not. | |
50 * | |
51 * @return false if anything goes wrong. | |
52 */ | |
53 virtual bool getPixels(const SkImageInfo& info, | |
54 void* pixels, | |
55 size_t rowBytes) = 0; | |
56 }; | |
57 | |
58 #endif // SkImageGenerator_DEFINED | |
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