/*

 * 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 "include/core/SkImageInfo.h"

#include "include/core/SkTypes.h"

#include "src/codec/SkBmpBaseCodec.h"

#include "src/codec/SkMaskSwizzler.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(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;

    using INHERITED = SkBmpBaseCodec;

};

#endif  // SkBmpMaskCodec_DEFINED