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1 /* | |
2 * Copyright 2011 The Android Open Source Project | |
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 | |
9 #ifndef SkBitmapRegionDecoder_DEFINED | |
10 #define SkBitmapRegionDecoder_DEFINED | |
11 | |
12 #include "SkBitmap.h" | |
13 #include "SkImageDecoder.h" | |
14 #include "SkStream.h" | |
15 | |
16 struct SkIRect; | |
17 | |
18 /** | |
19 * SkBitmapRegionDecoder can be used to decode a specified rect from an image. | |
20 * This is particularly useful when the original image is large and you only | |
21 * need parts of the image. | |
22 * | |
23 * However, not all image codecs on all platforms support this feature so be | |
24 * prepared to fallback to standard decoding if decodeRegion(...) returns false. | |
25 */ | |
26 class SkBitmapRegionDecoder { | |
27 public: | |
28 SkBitmapRegionDecoder(SkImageDecoder* decoder, SkStream* stream, | |
29 int width, int height) { | |
30 fDecoder = decoder; | |
31 fStream = stream; | |
32 fWidth = width; | |
33 fHeight = height; | |
34 } | |
35 ~SkBitmapRegionDecoder() { | |
36 SkDELETE(fDecoder); | |
37 SkSafeUnref(fStream); | |
38 } | |
39 | |
40 bool decodeRegion(SkBitmap* bitmap, const SkIRect& rect, | |
41 SkBitmap::Config pref, int sampleSize); | |
42 | |
43 SkImageDecoder* getDecoder() const { return fDecoder; } | |
44 int getWidth() const { return fWidth; } | |
45 int getHeight() const { return fHeight; } | |
46 | |
47 private: | |
48 SkImageDecoder* fDecoder; | |
49 SkStream* fStream; | |
50 int fWidth; | |
51 int fHeight; | |
52 }; | |
53 | |
54 #endif | |
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