msarett | a5783ae | 2015-09-08 15:35:32 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 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 | #include "SkBitmap.h" |
| 9 | #include "SkBitmapRegionDecoderInterface.h" |
| 10 | #include "SkScanlineDecoder.h" |
| 11 | |
| 12 | /* |
| 13 | * This class implements SkBitmapRegionDecoder using an SkScanlineDecoder and |
| 14 | * an SkCanvas. It uses the scanline decoder to subset the height. It then |
| 15 | * will subset the width and scale by drawing to an SkCanvas. |
| 16 | */ |
| 17 | // FIXME (msarett): This implementation does not support WEBP, because WEBP |
| 18 | // does not have a scanline decoder. |
| 19 | class SkBitmapRegionCanvas : public SkBitmapRegionDecoderInterface { |
| 20 | public: |
| 21 | |
| 22 | /* |
| 23 | * Takes ownership of pointer to decoder |
| 24 | */ |
| 25 | SkBitmapRegionCanvas(SkScanlineDecoder* decoder); |
| 26 | |
| 27 | /* |
| 28 | * Three differences from the Android version: |
| 29 | * Returns a Skia bitmap instead of an Android bitmap. |
| 30 | * Android version attempts to reuse a recycled bitmap. |
| 31 | * Removed the options object and used parameters for color type and |
| 32 | * sample size. |
| 33 | */ |
| 34 | SkBitmap* decodeRegion(int start_x, int start_y, int width, int height, |
| 35 | int sampleSize, SkColorType prefColorType) override; |
| 36 | |
| 37 | private: |
| 38 | |
| 39 | SkAutoTDelete<SkScanlineDecoder> fDecoder; |
| 40 | |
| 41 | typedef SkBitmapRegionDecoderInterface INHERITED; |
| 42 | |
| 43 | }; |