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# qimage.h

This is the verbatim text of the qimage.h include file. It is provided only for illustration; the copyright remains with Trolltech.

    /****************************************************************************
    ** $Id:  qt/qimage.h   3.0.3   edited Oct 12 12:18 $
    **
    ** Definition of QImage and QImageIO classes
    **
    ** Created : 950207
    **
    ** Copyright (C) 1992-2000 Trolltech AS.  All rights reserved.
    **
    ** This file is part of the kernel module of the Qt GUI Toolkit.
    **
    ** This file may be distributed under the terms of the Q Public License
    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
    **
    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.
    **
    ** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
    ** licenses may use this file in accordance with the Qt Commercial License
    ** Agreement provided with the Software.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    **   information about Qt Commercial License Agreements.
    ** See http://www.trolltech.com/qpl/ for QPL licensing information.
    ** See http://www.trolltech.com/gpl/ for GPL licensing information.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
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    **********************************************************************/

    #ifndef QIMAGE_H
    #define QIMAGE_H

    #ifndef QT_H
    #include "qpixmap.h"
    #include "qstrlist.h"
    #include "qstringlist.h"
    #endif // QT_H

    class QImageDataMisc; // internal
    #ifndef QT_NO_IMAGE_TEXT
    class Q_EXPORT QImageTextKeyLang {
    public:
        QImageTextKeyLang(const char* k, const char* l) : key(k), lang(l) { }
        QImageTextKeyLang() { }

        QCString key;
        QCString lang;

        bool operator< (const QImageTextKeyLang& other) const
    	{ return key < other.key || key==other.key && lang < other.lang; }
        bool operator== (const QImageTextKeyLang& other) const
    	{ return key==other.key && lang==other.lang; }
    };
    #endif //QT_NO_IMAGE_TEXT

    class Q_EXPORT QImage
    {
    public:
        enum Endian { IgnoreEndian, BigEndian, LittleEndian };

        QImage();
        QImage( int width, int height, int depth, int numColors=0,
    	    Endian bitOrder=IgnoreEndian );
        QImage( const QSize&, int depth, int numColors=0,
    	    Endian bitOrder=IgnoreEndian );
    #ifndef QT_NO_IMAGEIO
        QImage( const QString &fileName, const char* format=0 );
        QImage( const char * const xpm[] );
        QImage( const QByteArray &data );
    #endif
        QImage( uchar* data, int w, int h, int depth,
    		QRgb* colortable, int numColors,
    		Endian bitOrder );
    #ifdef Q_WS_QWS
        QImage( uchar* data, int w, int h, int depth, int pbl,
    		QRgb* colortable, int numColors,
    		Endian bitOrder );
    #endif
        QImage( const QImage & );
       ~QImage();

        QImage     &operator=( const QImage & );
        QImage     &operator=( const QPixmap & );
        bool	operator==( const QImage & ) const;
        bool	operator!=( const QImage & ) const;
        void	detach();
        QImage	copy()		const;
        QImage	copy(int x, int y, int w, int h, int conversion_flags=0) const;
        QImage	copy(const QRect&)	const;

        bool	isNull()	const	{ return data->bits == 0; }

        int		width()		const	{ return data->w; }
        int		height()	const	{ return data->h; }
        QSize	size()		const	{ return QSize(data->w,data->h); }
        QRect	rect()		const	{ return QRect(0,0,data->w,data->h); }
        int		depth()		const	{ return data->d; }
        int		numColors()	const	{ return data->ncols; }
        Endian	bitOrder()	const	{ return (Endian) data->bitordr; }

        QRgb	color( int i )	const;
        void	setColor( int i, QRgb c );
        void	setNumColors( int );

        bool	hasAlphaBuffer() const;
        void	setAlphaBuffer( bool );

        bool	allGray() const;
        bool        isGrayscale() const;

        uchar      *bits()		const;
        uchar      *scanLine( int ) const;
        uchar     **jumpTable()	const;
        QRgb       *colorTable()	const;
        int		numBytes()	const;
        int		bytesPerLine()	const;

    #ifdef Q_WS_QWS
        QGfx * graphicsContext();
    #endif

        bool	create( int width, int height, int depth, int numColors=0,
    			Endian bitOrder=IgnoreEndian );
        bool	create( const QSize&, int depth, int numColors=0,
    			Endian bitOrder=IgnoreEndian );
        void	reset();

        void	fill( uint pixel );
        void	invertPixels( bool invertAlpha = TRUE );

        QImage	convertDepth( int ) const;
    #ifndef QT_NO_IMAGE_TRUECOLOR
        QImage	convertDepthWithPalette( int, QRgb* p, int pc, int cf=0 ) const;
    #endif
        QImage	convertDepth( int, int conversion_flags ) const;
        QImage	convertBitOrder( Endian ) const;

        enum ScaleMode {
    	ScaleFree,
    	ScaleMin,
    	ScaleMax
        };
    #ifndef QT_NO_IMAGE_SMOOTHSCALE
        QImage smoothScale( int w, int h, ScaleMode mode=ScaleFree ) const;
        QImage smoothScale( const QSize& s, ScaleMode mode=ScaleFree ) const;
    #endif
    #ifndef QT_NO_IMAGE_TRANSFORMATION
        QImage scale( int w, int h, ScaleMode mode=ScaleFree ) const;
        QImage scale( const QSize& s, ScaleMode mode=ScaleFree ) const;
        QImage scaleWidth( int w ) const;
        QImage scaleHeight( int h ) const;
        QImage xForm( const QWMatrix &matrix ) const;
    #endif

    #ifndef QT_NO_IMAGE_DITHER_TO_1
        QImage	createAlphaMask( int conversion_flags=0 ) const;
    #endif
    #ifndef QT_NO_IMAGE_HEURISTIC_MASK
        QImage	createHeuristicMask( bool clipTight=TRUE ) const;
    #endif
    #ifndef QT_NO_IMAGE_MIRROR
        QImage	mirror() const;
        QImage	mirror(bool horizontally, bool vertically) const;
    #endif
        QImage	swapRGB() const;

        static Endian systemBitOrder();
        static Endian systemByteOrder();

    #ifndef QT_NO_IMAGEIO
        static const char* imageFormat( const QString &fileName );
        static QStrList inputFormats();
        static QStrList outputFormats();
    #ifndef QT_NO_STRINGLIST
        static QStringList inputFormatList();
        static QStringList outputFormatList();
    #endif
        bool	load( const QString &fileName, const char* format=0 );
        bool	loadFromData( const uchar *buf, uint len,
    			      const char *format=0 );
        bool	loadFromData( QByteArray data, const char* format=0 );
        bool	save( const QString &fileName, const char* format,
    		      int quality=-1 ) const;
    #endif //QT_NO_IMAGEIO

        bool	valid( int x, int y ) const;
        int		pixelIndex( int x, int y ) const;
        QRgb	pixel( int x, int y ) const;
        void	setPixel( int x, int y, uint index_or_rgb );

        // Auxiliary data
        int dotsPerMeterX() const;
        int dotsPerMeterY() const;
        void setDotsPerMeterX(int);
        void setDotsPerMeterY(int);
        QPoint offset() const;
        void setOffset(const QPoint&);
    #ifndef QT_NO_IMAGE_TEXT
        QValueList<QImageTextKeyLang> textList() const;
        QStringList textLanguages() const;
        QStringList textKeys() const;
        QString text(const char* key, const char* lang=0) const;
        QString text(const QImageTextKeyLang&) const;
        void setText(const char* key, const char* lang, const QString&);
    #endif
    private:
        void	init();
        void	reinit();
        void	freeBits();
        static void	warningIndexRange( const char *, int );
        QSize	scaleSize( const QSize &s, ScaleMode mode ) const;

        struct QImageData : public QShared {	// internal image data
    	int	w;				// image width
    	int	h;				// image height
    	int	d;				// image depth
    	int	ncols;				// number of colors
    	int	nbytes;				// number of bytes data
    	int	bitordr;			// bit order (1 bit depth)
    	QRgb   *ctbl;				// color table
    	uchar **bits;				// image data
    	bool	alpha;				// alpha buffer
    	int	dpmx;				// dots per meter X (or 0)
    	int	dpmy;				// dots per meter Y (or 0)
    	QPoint	offset;				// offset in pixels
    #ifndef QT_NO_IMAGE_TEXT
    	QImageDataMisc* misc;			// less common stuff
    #endif
    	bool    ctbl_mine;			// this allocated ctbl
        } *data;
    #ifndef QT_NO_IMAGE_TEXT
        QImageDataMisc& misc() const;
    #endif
        friend Q_EXPORT void bitBlt( QImage* dst, int dx, int dy,
    				 const QImage* src, int sx, int sy,
    				 int sw, int sh, int conversion_flags );
    };

    // QImage stream functions

    #if !defined(QT_NO_DATASTREAM) && !defined(QT_NO_IMAGEIO)
    Q_EXPORT QDataStream &operator<<( QDataStream &, const QImage & );
    Q_EXPORT QDataStream &operator>>( QDataStream &, QImage & );
    #endif

    #ifndef QT_NO_IMAGEIO
    class QIODevice;
    typedef void (*image_io_handler)( QImageIO * ); // image IO handler

    struct QImageIOData;

    class Q_EXPORT QImageIO
    {
    public:
        QImageIO();
        QImageIO( QIODevice	 *ioDevice, const char *format );
        QImageIO( const QString &fileName, const char* format );
       ~QImageIO();

        const QImage &image()	const	{ return im; }
        int		status()	const	{ return iostat; }
        const char *format()	const	{ return frmt; }
        QIODevice  *ioDevice()	const	{ return iodev; }
        QString	fileName()	const	{ return fname; }
        int		quality()	const;
        QString	description()	const	{ return descr; }
        const char *parameters()	const;
        float gamma() const;

        void	setImage( const QImage & );
        void	setStatus( int );
        void	setFormat( const char * );
        void	setIODevice( QIODevice * );
        void	setFileName( const QString & );
        void	setQuality( int );
        void	setDescription( const QString & );
        void	setParameters( const char * );
        void	setGamma( float );

        bool	read();
        bool	write();

        static const char* imageFormat( const QString &fileName );
        static const char *imageFormat( QIODevice * );
        static QStrList inputFormats();
        static QStrList outputFormats();

        static void defineIOHandler( const char *format,
    				 const char *header,
    				 const char *flags,
    				 image_io_handler read_image,
    				 image_io_handler write_image );

    private:
        void	init();

        QImage	im;				// image
        int		iostat;				// IO status
        QCString	frmt;				// image format
        QIODevice  *iodev;				// IO device
        QString	fname;				// file name
        char       *params;				// image parameters //### change to QImageIOData *d in 3.0
        QString     descr;				// image description
        QImageIOData *d;

    private:	// Disabled copy constructor and operator=
    #if defined(Q_DISABLE_COPY)
        QImageIO( const QImageIO & );
        QImageIO &operator=( const QImageIO & );
    #endif
    };

    #endif //QT_NO_IMAGEIO

    Q_EXPORT void bitBlt( QImage* dst, int dx, int dy, const QImage* src,
    		      int sx=0, int sy=0, int sw=-1, int sh=-1,
    		      int conversion_flags=0 );

    /*****************************************************************************
      QImage member functions
     *****************************************************************************/

    inline bool QImage::hasAlphaBuffer() const
    {
        return data->alpha;
    }

    inline uchar *QImage::bits() const
    {
        return data->bits ? data->bits[0] : 0;
    }

    inline uchar **QImage::jumpTable() const
    {
        return data->bits;
    }

    inline QRgb *QImage::colorTable() const
    {
        return data->ctbl;
    }

    inline int QImage::numBytes() const
    {
        return data->nbytes;
    }

    inline int QImage::bytesPerLine() const
    {
        return data->h ? data->nbytes/data->h : 0;
    }

    inline QImage QImage::copy(const QRect& r) const
    {
        return copy(r.x(), r.y(), r.width(), r.height());
    }

    inline QRgb QImage::color( int i ) const
    {
    #if defined(QT_CHECK_RANGE)
        if ( i >= data->ncols )
    	warningIndexRange( "color", i );
    #endif
        return data->ctbl ? data->ctbl[i] : (QRgb)-1;
    }

    inline void QImage::setColor( int i, QRgb c )
    {
    #if defined(QT_CHECK_RANGE)
        if ( i >= data->ncols )
    	warningIndexRange( "setColor", i );
    #endif
        if ( data->ctbl )
    	data->ctbl[i] = c;
    }

    inline uchar *QImage::scanLine( int i ) const
    {
    #if defined(QT_CHECK_RANGE)
        if ( i >= data->h )
    	warningIndexRange( "scanLine", i );
    #endif
        return data->bits ? data->bits[i] : 0;
    }

    inline int QImage::dotsPerMeterX() const
    {
        return data->dpmx;
    }

    inline int QImage::dotsPerMeterY() const
    {
        return data->dpmy;
    }

    inline QPoint QImage::offset() const
    {
        return data->offset;
    }

    #endif // QIMAGE_H