| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #ifndef SkBmpStandardCodec_DEFINED |
| #define SkBmpStandardCodec_DEFINED |
| |
| #include "SkBmpBaseCodec.h" |
| #include "SkColorTable.h" |
| #include "SkImageInfo.h" |
| #include "SkSwizzler.h" |
| #include "SkTypes.h" |
| |
| /* |
| * This class implements the decoding for bmp images that use "standard" modes, |
| * which essentially means they do not contain bit masks or RLE codes. |
| */ |
| class SkBmpStandardCodec : public SkBmpBaseCodec { |
| public: |
| |
| /* |
| * Creates an instance of the decoder |
| * |
| * Called only by SkBmpCodec::NewFromStream |
| * There should be no other callers despite this being public |
| * |
| * @param info contains properties of the encoded data |
| * @param stream the stream of encoded image data |
| * @param bitsPerPixel the number of bits used to store each pixel |
| * @param numColors the number of colors in the color table |
| * @param bytesPerColor the number of bytes in the stream used to represent |
| each color in the color table |
| * @param offset the offset of the image pixel data from the end of the |
| * headers |
| * @param rowOrder indicates whether rows are ordered top-down or bottom-up |
| * @param isOpaque indicates if the bmp itself is opaque (before applying |
| * the icp mask, if there is one) |
| * @param inIco indicates if the bmp is embedded in an ico file |
| */ |
| SkBmpStandardCodec(int width, int height, const SkEncodedInfo& info, SkStream* stream, |
| uint16_t bitsPerPixel, uint32_t numColors, uint32_t bytesPerColor, |
| uint32_t offset, SkCodec::SkScanlineOrder rowOrder, bool isOpaque, |
| bool inIco); |
| |
| protected: |
| |
| Result onGetPixels(const SkImageInfo& dstInfo, void* dst, |
| size_t dstRowBytes, const Options&, |
| int*) override; |
| |
| bool onInIco() const override { |
| return fInIco; |
| } |
| |
| SkCodec::Result onPrepareToDecode(const SkImageInfo& dstInfo, |
| const SkCodec::Options& options) override; |
| |
| |
| uint64_t onGetFillValue(const SkImageInfo&) const override; |
| |
| SkSampler* getSampler(bool createIfNecessary) override { |
| SkASSERT(fSwizzler); |
| return fSwizzler.get(); |
| } |
| |
| private: |
| |
| /* |
| * Creates the color table |
| */ |
| bool createColorTable(SkColorType colorType, SkAlphaType alphaType); |
| |
| void initializeSwizzler(const SkImageInfo& dstInfo, const Options& opts); |
| |
| int decodeRows(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes, |
| const Options& opts) override; |
| |
| /* |
| * @param stream This may be a pointer to the stream owned by the parent SkCodec |
| * or a sub-stream of the stream owned by the parent SkCodec. |
| * Either way, this stream is unowned. |
| */ |
| void decodeIcoMask(SkStream* stream, const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes); |
| |
| sk_sp<SkColorTable> fColorTable; |
| // fNumColors is the number specified in the header, or 0 if not present in the header. |
| const uint32_t fNumColors; |
| const uint32_t fBytesPerColor; |
| const uint32_t fOffset; |
| std::unique_ptr<SkSwizzler> fSwizzler; |
| const bool fIsOpaque; |
| const bool fInIco; |
| const size_t fAndMaskRowBytes; // only used for fInIco decodes |
| |
| typedef SkBmpBaseCodec INHERITED; |
| }; |
| #endif // SkBmpStandardCodec_DEFINED |