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/*
* 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 SkCodec_wbmp_DEFINED
#define SkCodec_wbmp_DEFINED
#include "SkCodec.h"
#include "SkColorSpace.h"
#include "SkSwizzler.h"
class SkWbmpCodec final : public SkCodec {
public:
static bool IsWbmp(const void*, size_t);
/*
* Assumes IsWbmp was called and returned true
* Creates a wbmp codec
* Takes ownership of the stream
*/
static std::unique_ptr<SkCodec> MakeFromStream(std::unique_ptr<SkStream>, Result*);
protected:
SkEncodedImageFormat onGetEncodedFormat() const override;
Result onGetPixels(const SkImageInfo&, void*, size_t,
const Options&, int*) override;
bool onRewind() override;
bool conversionSupported(const SkImageInfo& dst, SkColorType srcColor,
bool srcIsOpaque, const SkColorSpace* srcCS) const override;
// No need to Xform; all pixels are either black or white.
bool usesColorXform() const override { return false; }
private:
/*
* Returns a swizzler on success, nullptr on failure
*/
SkSwizzler* initializeSwizzler(const SkImageInfo& info,
const Options& opts);
SkSampler* getSampler(bool createIfNecessary) override {
SkASSERT(fSwizzler || !createIfNecessary);
return fSwizzler.get();
}
/*
* Read a src row from the encoded stream
*/
bool readRow(uint8_t* row);
SkWbmpCodec(int width, int height, const SkEncodedInfo&, std::unique_ptr<SkStream>);
const size_t fSrcRowBytes;
// Used for scanline decodes:
std::unique_ptr<SkSwizzler> fSwizzler;
SkAutoTMalloc<uint8_t> fSrcBuffer;
int onGetScanlines(void* dst, int count, size_t dstRowBytes) override;
bool onSkipScanlines(int count) override;
Result onStartScanlineDecode(const SkImageInfo& dstInfo,
const Options& options) override;
typedef SkCodec INHERITED;
};
#endif // SkCodec_wbmp_DEFINED
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