dither.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_CODECS_DITHER_H
#define IMAGE_CODECS_DITHER_H
 
#include "image/codecs/codec.h"
 
#include "common/types.h"
#include "graphics/palette.h"
 
namespace Image {
 
class DitherCodec : public Codec {
public:
    DitherCodec(Codec *codec, DisposeAfterUse::Flag disposeAfterUse = DisposeAfterUse::YES);
    virtual ~DitherCodec() override;
 
    const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream) override;
 
    Graphics::PixelFormat getPixelFormat() const override;
    bool setOutputPixelFormat(const Graphics::PixelFormat &format) override;
    bool containsPalette() const override;
    const byte *getPalette() override;
    bool hasDirtyPalette() const override;
    bool canDither(DitherType type) const override;
    void setDither(DitherType type, const byte *palette) override;
    void setCodecAccuracy(CodecAccuracy accuracy) override;
 
    void setPalette(const byte *palette) { _srcPalette = palette; }
 
    static byte *createQuickTimeDitherTable(const byte *palette, uint colorCount);
 
private:
    DisposeAfterUse::Flag _disposeAfterUse;
    Codec *_codec;
    const byte *_srcPalette;
 
    Graphics::Surface *_ditherFrame;
    Graphics::Palette _forcedDitherPalette;
    byte *_ditherTable;
    bool _dirtyPalette;
};
 
} // End of namespace Image
 
#endif