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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 SkBmpMaskCodec_DEFINED
#define SkBmpMaskCodec_DEFINED
#include "SkBmpBaseCodec.h"
#include "SkImageInfo.h"
#include "SkMaskSwizzler.h"
#include "SkTypes.h"
/*
* This class implements the decoding for bmp images using bit masks
*/
class SkBmpMaskCodec : 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 masks color masks for certain bmp formats
* @param rowOrder indicates whether rows are ordered top-down or bottom-up
*/
SkBmpMaskCodec(int width, int height, const SkEncodedInfo& info, std::unique_ptr<SkStream>,
uint16_t bitsPerPixel, SkMasks* masks,
SkCodec::SkScanlineOrder rowOrder);
protected:
Result onGetPixels(const SkImageInfo& dstInfo, void* dst,
size_t dstRowBytes, const Options&,
int*) override;
SkCodec::Result onPrepareToDecode(const SkImageInfo& dstInfo,
const SkCodec::Options& options) override;
private:
SkSampler* getSampler(bool createIfNecessary) override {
SkASSERT(fMaskSwizzler);
return fMaskSwizzler.get();
}
int decodeRows(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes,
const Options& opts) override;
std::unique_ptr<SkMasks> fMasks;
std::unique_ptr<SkMaskSwizzler> fMaskSwizzler;
typedef SkBmpBaseCodec INHERITED;
};
#endif // SkBmpMaskCodec_DEFINED
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