1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192 |
- /*
- * 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 "include/core/SkImageInfo.h"
- #include "include/core/SkTypes.h"
- #include "src/codec/SkBmpBaseCodec.h"
- #include "src/codec/SkColorTable.h"
- #include "src/codec/SkSwizzler.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::MakeFromStream
- * 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(SkEncodedInfo&& info, std::unique_ptr<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;
- SkSampler* getSampler(bool createIfNecessary) override {
- SkASSERT(fSwizzler);
- return fSwizzler.get();
- }
- private:
- bool createColorTable(SkColorType colorType, SkAlphaType alphaType);
- SkEncodedInfo swizzlerInfo() const;
- 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
|