jpeg.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef IMAGE_JPEG_H
#define IMAGE_JPEG_H

#include "graphics/palette.h"
#include "graphics/surface.h"
#include "image/image_decoder.h"
#include "image/codecs/codec.h"

namespace Common {
class SeekableReadStream;
}

namespace Image {

class JPEGDecoder : public ImageDecoder, public Codec {
public:
    JPEGDecoder();
    ~JPEGDecoder();

    // ImageDecoder API
    void destroy() override;
    bool loadStream(Common::SeekableReadStream &str) override;
    const Graphics::Surface *getSurface() const override;
    const Graphics::Palette &getPalette() const override { return _palette; }

    // Codec API
    const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream) override;
    void setCodecAccuracy(CodecAccuracy accuracy) override;
    Graphics::PixelFormat getPixelFormat() const override;
    bool setOutputPixelFormat(const Graphics::PixelFormat &format) override {
        if (format.isCLUT8())
            return false;
        _requestedPixelFormat = format;
        return true;
    }

    // Special API for JPEG
    enum ColorSpace {
        kColorSpaceRGB,

        kColorSpaceYUV
    };

    void setOutputColorSpace(ColorSpace outSpace) { _colorSpace = outSpace; }

private:
    // TODO: Avoid inheriting from multiple superclasses that have identical member functions.
    using Codec::getPalette;
    Graphics::Surface _surface;
    Graphics::Palette _palette;
    ColorSpace _colorSpace;
    Graphics::PixelFormat _requestedPixelFormat;
    CodecAccuracy _accuracy;

    Graphics::PixelFormat getByteOrderRgbPixelFormat() const;
};
} // End of namespace Image

#endif