/*

 * 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 "include/codec/SkCodec.h"

#include "include/core/SkTypes.h"

#include "include/private/base/SkTemplates.h"

#include "src/codec/SkSwizzler.h"

#include <cstddef>

#include <cstdint>

#include <memory>

class SkSampler;

class SkStream;

enum class SkEncodedImageFormat;

struct SkEncodedInfo;

struct SkImageInfo;

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, bool srcIsOpaque,

                             bool needsXform) override;

    // No need to Xform; all pixels are either black or white.

    bool usesColorXform() const override { return false; }

private:

    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(SkEncodedInfo&&, std::unique_ptr<SkStream>);

    const size_t                fSrcRowBytes;

    // Used for scanline decodes:

    std::unique_ptr<SkSwizzler> fSwizzler;

    skia_private::AutoTMalloc<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;

    using INHERITED = SkCodec;

};

#endif  // SkCodec_wbmp_DEFINED