png.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_PNG_H
#define IMAGE_PNG_H

#include "common/scummsys.h"
#include "common/textconsole.h"
#include "graphics/pixelformat.h"
#include "image/image_decoder.h"

namespace Common {
class SeekableReadStream;
class WriteStream;
}

namespace Graphics {
struct Surface;
}

namespace Image {

class PNGDecoder : public ImageDecoder {
public:
    PNGDecoder();
    ~PNGDecoder();

    bool loadStream(Common::SeekableReadStream &stream) override;
    void destroy() override;
    const Graphics::Surface *getSurface() const override { return _outputSurface; }
    const byte *getPalette() const override { return _palette; }
    uint16 getPaletteColorCount() const override { return _paletteColorCount; }
    bool hasTransparentColor() const override { return _hasTransparentColor; }
    uint32 getTransparentColor() const override { return _transparentColor; }
    void setSkipSignature(bool skip) { _skipSignature = skip; }
    void setKeepTransparencyPaletted(bool keep) { _keepTransparencyPaletted = keep; }
private:
    Graphics::PixelFormat getByteOrderRgbaPixelFormat(bool isAlpha) const;

    byte *_palette;
    uint16 _paletteColorCount;

    // flag to skip the png signature check for headless png files
    bool _skipSignature;

    // Flag to keep paletted images paletted, even when the image has transparency
    bool _keepTransparencyPaletted;
    bool _hasTransparentColor;
    uint32 _transparentColor;

    Graphics::Surface *_outputSurface;
};

bool writePNG(Common::WriteStream &out, const Graphics::Surface &input, const byte *palette = nullptr);
} // End of namespace Image

#endif