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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 class 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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