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 "SkBmpBaseCodec.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 SkBmpBaseCodec { 20 public: 21 22 /* 23 * Creates an instance of the decoder 24 * 25 * Called only by SkBmpCodec::MakeFromStream 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(SkEncodedInfo&& info, std::unique_ptr<SkStream>, 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&, 42 int*) override; 43 44 SkCodec::Result onPrepareToDecode(const SkImageInfo& dstInfo, 45 const SkCodec::Options& options) override; 46 47 private: 48 getSampler(bool createIfNecessary)49 SkSampler* getSampler(bool createIfNecessary) override { 50 SkASSERT(fMaskSwizzler); 51 return fMaskSwizzler.get(); 52 } 53 54 int decodeRows(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes, 55 const Options& opts) override; 56 57 std::unique_ptr<SkMasks> fMasks; 58 std::unique_ptr<SkMaskSwizzler> fMaskSwizzler; 59 60 typedef SkBmpBaseCodec INHERITED; 61 }; 62 #endif // SkBmpMaskCodec_DEFINED 63