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 #ifndef SkBmpMaskCodec_DEFINED 9 #define SkBmpMaskCodec_DEFINED 10 11 #include "SkBmpCodec.h" 12 #include "SkImageInfo.h" 13 #include "SkMaskSwizzler.h" 14 #include "SkTypes.h" 15 16 /* 17 * This class implements the decoding for bmp images using bit masks 18 */ 19 class SkBmpMaskCodec : public SkBmpCodec { 20 public: 21 22 /* 23 * Creates an instance of the decoder 24 * 25 * Called only by SkBmpCodec::NewFromStream 26 * There should be no other callers despite this being public 27 * 28 * @param info contains properties of the encoded data 29 * @param stream the stream of encoded image data 30 * @param bitsPerPixel the number of bits used to store each pixel 31 * @param masks color masks for certain bmp formats 32 * @param rowOrder indicates whether rows are ordered top-down or bottom-up 33 */ 34 SkBmpMaskCodec(int width, int height, const SkEncodedInfo& info, SkStream* stream, 35 uint16_t bitsPerPixel, SkMasks* masks, 36 SkCodec::SkScanlineOrder rowOrder); 37 38 protected: 39 40 Result onGetPixels(const SkImageInfo& dstInfo, void* dst, 41 size_t dstRowBytes, const Options&, SkPMColor*, 42 int*, int*) override; 43 44 SkCodec::Result onPrepareToDecode(const SkImageInfo& dstInfo, 45 const SkCodec::Options& options, SkPMColor inputColorPtr[], 46 int* inputColorCount) override; 47 48 private: 49 50 SkSampler* getSampler(bool createIfNecessary) override { 51 SkASSERT(fMaskSwizzler); 52 return fMaskSwizzler.get(); 53 } 54 55 int decodeRows(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes, 56 const Options& opts) override; 57 58 std::unique_ptr<SkMasks> fMasks; 59 std::unique_ptr<SkMaskSwizzler> fMaskSwizzler; 60 std::unique_ptr<uint8_t[]> fSrcBuffer; 61 62 typedef SkBmpCodec INHERITED; 63 }; 64 #endif // SkBmpMaskCodec_DEFINED 65
