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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 "SkBitmapRegionDecoder.h" | |
10 #include "SkCodec.h" | |
11 | |
12 /* | |
13 * This class implements SkBitmapRegionDecoder using an SkCodec 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: This class works well as a performance/quality comparison for | |
18 // SkBitmapRegionCodec, but it lacks several capabilities that are | |
19 // required by BitmapRegionDecoder in Android. | |
20 // (1) WEBP decodes - because SkWebpCodec does not have a scanline | |
21 // decoder. | |
22 // (2) Decodes to kGray8 and kIndex8. | |
23 // (3) Decodes to kUnpremul. | |
24 // (4) Correcting an invalid dstColorType. For example, if the | |
25 // client requests kRGB_565 for a non-opaque image, rather than | |
26 // fail, we need to go ahead and decode to kN32. | |
27 class SkBitmapRegionCanvas : public SkBitmapRegionDecoder { | |
28 public: | |
29 | |
30 /* | |
31 * Takes ownership of pointer to decoder | |
32 */ | |
33 SkBitmapRegionCanvas(SkCodec* decoder); | |
34 | |
35 bool decodeRegion(SkBitmap* bitmap, SkBRDAllocator* allocator, | |
36 const SkIRect& desiredSubset, int sampleSize, | |
37 SkColorType colorType, bool requireUnpremul) override; | |
38 | |
39 bool conversionSupported(SkColorType colorType) override; | |
40 | |
41 SkEncodedFormat getEncodedFormat() override { return fDecoder->getEncodedFor
mat(); } | |
42 | |
43 private: | |
44 | |
45 SkAutoTDelete<SkCodec> fDecoder; | |
46 | |
47 typedef SkBitmapRegionDecoder INHERITED; | |
48 | |
49 }; | |
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