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 SkCodec_wbmp_DEFINED 9 #define SkCodec_wbmp_DEFINED 10 11 #include "SkCodec.h" 12 #include "SkColorSpace.h" 13 #include "SkSwizzler.h" 14 15 class SkWbmpCodec final : public SkCodec { 16 public: 17 static bool IsWbmp(const void*, size_t); 18 19 /* 20 * Assumes IsWbmp was called and returned true 21 * Creates a wbmp codec 22 * Takes ownership of the stream 23 */ 24 static std::unique_ptr<SkCodec> MakeFromStream(std::unique_ptr<SkStream>, Result*); 25 26 protected: 27 SkEncodedImageFormat onGetEncodedFormat() const override; 28 Result onGetPixels(const SkImageInfo&, void*, size_t, 29 const Options&, int*) override; 30 bool onRewind() override; 31 bool conversionSupported(const SkImageInfo& dst, bool srcIsOpaque, 32 bool needsXform) override; 33 // No need to Xform; all pixels are either black or white. 34 bool usesColorXform() const override { return false; } 35 private: 36 SkSampler* getSampler(bool createIfNecessary) override { 37 SkASSERT(fSwizzler || !createIfNecessary); 38 return fSwizzler.get(); 39 } 40 41 /* 42 * Read a src row from the encoded stream 43 */ 44 bool readRow(uint8_t* row); 45 46 SkWbmpCodec(SkEncodedInfo&&, std::unique_ptr<SkStream>); 47 48 const size_t fSrcRowBytes; 49 50 // Used for scanline decodes: 51 std::unique_ptr<SkSwizzler> fSwizzler; 52 SkAutoTMalloc<uint8_t> fSrcBuffer; 53 54 int onGetScanlines(void* dst, int count, size_t dstRowBytes) override; 55 bool onSkipScanlines(int count) override; 56 Result onStartScanlineDecode(const SkImageInfo& dstInfo, 57 const Options& options) override; 58 59 typedef SkCodec INHERITED; 60 }; 61 62 #endif // SkCodec_wbmp_DEFINED 63
