iPNG.h

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/*
imagen - Simple object-oriented imaging library
Copyright (C) 2011-2012 Mark D. Procarione

imagen is free software: you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation, either
version 3 of the License, or (at your option) any later version.

imagen 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.
*/

#ifndef __IPNG_H__
#define __IPNG_H__

#include "imagen.h"

#ifdef IMAGEN_PNG

#include "iAbstractImage.h"

namespace imagen
{

    class iPNG : public iAbstractImage
    {
        public:
            enum PNGInterlaceType
            {
                InterlaceNone,
                InterlaceAdam7
            };

        public:
            iPNG();


            iPNG( const iPNG &img );

            iPNG( const iAbstractImage &img );


            iPNG( int w, int h, iImageFormat f );


            iPNG( Iubyte *d, int w, int h, iImageFormat f, int b );


            iPNG( const char *filename );


            iPNG( Iubyte *buf, int len );


            iPNG( iDataStream *s );

            ~iPNG();

            void clear();

            bool isFormatSupported( iImageFormat fmt ) const;

            static bool isValid( iDataStream *s );


            void setCompressLevel( int lvl );

            int getCompressLevel() const { return compLvl; }

            void setInterlaceType( PNGInterlaceType type ) { intType = type; }

            PNGInterlaceType getInterlaceType() const { return intType; }

            iPNG &operator=( const iPNG &img );

            iPNG &operator=( const iAbstractImage &img );

        protected:
            void init();
            bool loadImage();
            bool saveImage();

        private:
            bool checkSignature();
            bool readImageInfo();
            bool readImageData();

            bool readInit();
            bool writeInit();
            void readClean();
            void writeClean();

            bool writeImageInfo();
            bool writeImageData();

            void getPNGPalette();
            void setPNGPalette();

            void getPNGText();
            void setPNGText();

        private:
            PNGInterlaceType intType;
            int compLvl;
    };
}

#endif // IMAGEN_PNG

#endif // __IPNG_H__