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# qpainter.h

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

    /****************************************************************************
    ** $Id: qt/qpainter.h   3.3.3   edited Jun 1 14:27 $
    **
    ** Definition of QPainter class
    **
    ** Created : 940112
    **
    ** 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.
    **
    **********************************************************************/

    #ifndef QPAINTER_H
    #define QPAINTER_H

    #ifndef QT_H
    #include "qcolor.h"
    #include "qfontmetrics.h"
    #include "qfontinfo.h"
    #include "qregion.h"
    #include "qpen.h"
    #include "qbrush.h"
    #include "qpointarray.h"
    #include "qwmatrix.h"
    #endif // QT_H

    class QGfx;
    class QTextCodec;
    class QTextParag;
    class QPaintDevice;
    class QTextItem;
    #if defined( Q_WS_MAC )
    class QMacSavedPortInfo;
    #endif
    class QPainterPrivate;

    #if defined(Q_WS_QWS)
    class QScreen;
    #endif

    class Q_EXPORT QPainter : public Qt
    {
    public:
        enum CoordinateMode { CoordDevice, CoordPainter };

        QPainter();
        QPainter( const QPaintDevice *, bool unclipped = FALSE );
        QPainter( const QPaintDevice *, const QWidget *, bool unclipped = FALSE );
       ~QPainter();

        bool	begin( const QPaintDevice *, bool unclipped = FALSE );
        bool	begin( const QPaintDevice *, const QWidget *, bool unclipped = FALSE );
        bool	end();
        QPaintDevice *device() const;

    #ifdef Q_WS_QWS
        QGfx * internalGfx();
    #ifdef QT_QWS_EXPERIMENTAL_SCREENPAINTER
        bool begin(QScreen *screen);
    #endif
    #endif

        static void redirect( QPaintDevice *pdev, QPaintDevice *replacement );
        static QPaintDevice *redirect( QPaintDevice *pdev );

        bool	isActive() const;

        void	flush( const QRegion &region, CoordinateMode cm = CoordDevice );
        void	flush();
        void	save();
        void	restore();

      // Drawing tools

        QFontMetrics fontMetrics()	const;
        QFontInfo	 fontInfo()	const;

        const QFont &font()		const;
        void	setFont( const QFont & );
        const QPen &pen()		const;
        void	setPen( const QPen & );
        void	setPen( PenStyle );
        void	setPen( const QColor & );
        const QBrush &brush()	const;
        void	setBrush( const QBrush & );
        void	setBrush( BrushStyle );
        void	setBrush( const QColor & );
        QPoint	pos() const;

      // Drawing attributes/modes

        const QColor &backgroundColor() const;
        void	setBackgroundColor( const QColor & );
        BGMode	backgroundMode() const;
        void	setBackgroundMode( BGMode );
        RasterOp	rasterOp()	const;
        void	setRasterOp( RasterOp );
        const QPoint &brushOrigin() const;
        void	setBrushOrigin( int x, int y );
        void	setBrushOrigin( const QPoint & );

      // Scaling and transformations

    //    PaintUnit unit()	       const;		// get set painter unit
    //    void	setUnit( PaintUnit );		// NOT IMPLEMENTED!!!

        bool	hasViewXForm() const;
        bool	hasWorldXForm() const;

    #ifndef QT_NO_TRANSFORMATIONS
        void	setViewXForm( bool );		// set xform on/off
        QRect	window()       const;		// get window
        void	setWindow( const QRect & );	// set window
        void	setWindow( int x, int y, int w, int h );
        QRect	viewport()   const;		// get viewport
        void	setViewport( const QRect & );	// set viewport
        void	setViewport( int x, int y, int w, int h );

        void	setWorldXForm( bool );		// set world xform on/off
        const QWMatrix &worldMatrix() const;	// get/set world xform matrix
        void	setWorldMatrix( const QWMatrix &, bool combine=FALSE );

        void	saveWorldMatrix();
        void	restoreWorldMatrix();

        void	scale( double sx, double sy );
        void	shear( double sh, double sv );
        void	rotate( double a );
    #endif
        void	translate( double dx, double dy );
        void	resetXForm();
        double	translationX() const;
        double	translationY() const;

        QPoint	xForm( const QPoint & ) const;	// map virtual -> device
        QRect	xForm( const QRect & )	const;
        QPointArray xForm( const QPointArray & ) const;
        QPointArray xForm( const QPointArray &, int index, int npoints ) const;
        QPoint	xFormDev( const QPoint & ) const; // map device -> virtual
        QRect	xFormDev( const QRect & )  const;
        QPointArray xFormDev( const QPointArray & ) const;
        QPointArray xFormDev( const QPointArray &, int index, int npoints ) const;

      // Clipping

        void	setClipping( bool );		// set clipping on/off
        bool	hasClipping() const;
        QRegion clipRegion( CoordinateMode = CoordDevice ) const;
        void	setClipRect( const QRect &, CoordinateMode = CoordDevice );	// set clip rectangle
        void	setClipRect( int x, int y, int w, int h, CoordinateMode = CoordDevice );
        void	setClipRegion( const QRegion &, CoordinateMode = CoordDevice );// set clip region

      // Graphics drawing functions

        void	drawPoint( int x, int y );
        void	drawPoint( const QPoint & );
        void	drawPoints( const QPointArray& a,
    			    int index=0, int npoints=-1 );
        void	moveTo( int x, int y );
        void	moveTo( const QPoint & );
        void	lineTo( int x, int y );
        void	lineTo( const QPoint & );
        void	drawLine( int x1, int y1, int x2, int y2 );
        void	drawLine( const QPoint &, const QPoint & );
        void	drawRect( int x, int y, int w, int h );
        void	drawRect( const QRect & );
        void	drawWinFocusRect( int x, int y, int w, int h );
        void	drawWinFocusRect( int x, int y, int w, int h,
    				  const QColor &bgColor );
        void	drawWinFocusRect( const QRect & );
        void	drawWinFocusRect( const QRect &,
    				  const QColor &bgColor );
        void	drawRoundRect( int x, int y, int w, int h, int = 25, int = 25 );
        void	drawRoundRect( const QRect &, int = 25, int = 25 );
        void	drawEllipse( int x, int y, int w, int h );
        void	drawEllipse( const QRect & );
        void	drawArc( int x, int y, int w, int h, int a, int alen );
        void	drawArc( const QRect &, int a, int alen );
        void	drawPie( int x, int y, int w, int h, int a, int alen );
        void	drawPie( const QRect &, int a, int alen );
        void	drawChord( int x, int y, int w, int h, int a, int alen );
        void	drawChord( const QRect &, int a, int alen );
        void	drawLineSegments( const QPointArray &,
    				  int index=0, int nlines=-1 );
        void	drawPolyline( const QPointArray &,
    			      int index=0, int npoints=-1 );
        void	drawPolygon( const QPointArray &, bool winding=FALSE,
    			     int index=0, int npoints=-1 );
        void	drawConvexPolygon( const QPointArray &,
    			     int index=0, int npoints=-1 );
    #ifndef QT_NO_BEZIER
        void	drawCubicBezier( const QPointArray &, int index=0 );
    #endif
        void	drawPixmap( int x, int y, const QPixmap &,
    			    int sx=0, int sy=0, int sw=-1, int sh=-1 );
        void	drawPixmap( const QPoint &, const QPixmap &,
    			    const QRect &sr );
        void	drawPixmap( const QPoint &, const QPixmap & );
        void	drawPixmap( const QRect &, const QPixmap & );
        void	drawImage( int x, int y, const QImage &,
    			   int sx = 0, int sy = 0, int sw = -1, int sh = -1,
    			   int conversionFlags = 0 );
        void	drawImage( const QPoint &, const QImage &,
    			   const QRect &sr, int conversionFlags = 0 );
        void	drawImage( const QPoint &, const QImage &,
    			   int conversion_flags = 0 );
        void	drawImage( const QRect &, const QImage & );
        void	drawTiledPixmap( int x, int y, int w, int h, const QPixmap &,
    				 int sx=0, int sy=0 );
        void	drawTiledPixmap( const QRect &, const QPixmap &,
    				 const QPoint & );
        void	drawTiledPixmap( const QRect &, const QPixmap & );
    #ifndef QT_NO_PICTURE
        void	drawPicture( const QPicture & );
        void	drawPicture( int x, int y, const QPicture & );
        void	drawPicture( const QPoint &, const QPicture & );
    #endif

        void	fillRect( int x, int y, int w, int h, const QBrush & );
        void	fillRect( const QRect &, const QBrush & );
        void	eraseRect( int x, int y, int w, int h );
        void	eraseRect( const QRect & );

      // Text drawing functions

        enum TextDirection {
    	Auto,
    	RTL,
    	LTR
        };

        void	drawText( int x, int y, const QString &, int len = -1, TextDirection dir = Auto );
        void	drawText( const QPoint &, const QString &, int len = -1, TextDirection dir = Auto );

        void     drawText( int x, int y, const QString &, int pos, int len, TextDirection dir = Auto );
        void     drawText( const QPoint &p, const QString &, int pos, int len, TextDirection dir = Auto );

        void	drawText( int x, int y, int w, int h, int flags,
    			  const QString&, int len = -1, QRect *br=0,
    			  QTextParag **intern=0 );
        void	drawText( const QRect &, int flags,
    			  const QString&, int len = -1, QRect *br=0,
    			  QTextParag **intern=0 );

        void drawTextItem( int x, int y, const QTextItem &ti, int textflags = 0 );
        void drawTextItem( const QPoint& p, const QTextItem &ti, int textflags = 0 );

        QRect	boundingRect( int x, int y, int w, int h, int flags,
    			      const QString&, int len = -1, QTextParag **intern=0 );
        QRect	boundingRect( const QRect &, int flags,
    			      const QString&, int len = -1, QTextParag **intern=0 );

        int		tabStops() const;
        void	setTabStops( int );
        int	       *tabArray() const;
        void	setTabArray( int * );

        // Other functions

    #if defined(Q_WS_WIN)
        HDC		handle() const;
    #elif defined(Q_WS_X11) || defined(Q_WS_MAC)
        HANDLE	handle() const;
    #endif

        static void initialize();
        static void cleanup();

    private:
        void	init();
        void        destroy();
        void	updateFont();
        void	updatePen();
        void	updateBrush();
    #ifndef QT_NO_TRANSFORMATIONS
        void	updateXForm();
        void	updateInvXForm();
    #endif
        void	map( int, int, int *rx, int *ry ) const;
        void	map( int, int, int, int, int *, int *, int *, int * ) const;
        void	mapInv( int, int, int *, int * ) const;
        void	mapInv( int, int, int, int, int *, int *, int *, int * ) const;
        void	drawPolyInternal( const QPointArray &, bool close=TRUE );
        void	drawWinFocusRect( int x, int y, int w, int h, bool xorPaint,
    				  const QColor &penColor );

        enum { IsActive=0x01, ExtDev=0x02, IsStartingUp=0x04, NoCache=0x08,
    	   VxF=0x10, WxF=0x20, ClipOn=0x40, SafePolygon=0x80, MonoDev=0x100,
    	   DirtyFont=0x200, DirtyPen=0x400, DirtyBrush=0x800,
    	   RGBColor=0x1000, FontMet=0x2000, FontInf=0x4000, CtorBegin=0x8000,
               UsePrivateCx = 0x10000, VolatileDC = 0x20000, Qt2Compat = 0x40000 };
        uint	flags;
        bool	testf( uint b ) const { return (flags&b)!=0; }
        void	setf( uint b )	{ flags |= b; }
        void	setf( uint b, bool v );
        void	clearf( uint b )	{ flags &= (uint)(~b); }
        void	fix_neg_rect( int *x, int *y, int *w, int *h );

        QPainterPrivate *d;
        QPaintDevice *pdev;
        QColor	bg_col;
        uchar	bg_mode;
        uchar	rop;
        uchar	pu;
        QPoint	bro;
        QFont	cfont;
        QFont *pfont; 	// font used for metrics (might be different for printers)
        QPen	cpen;
        QBrush	cbrush;
        QRegion	crgn;
        int		tabstops;
        int	       *tabarray;
        int		tabarraylen;
        bool	block_ext;	// for temporary blocking of external devices

        // Transformations
    #ifndef QT_NO_TRANSFORMATIONS
        QCOORD	wx, wy, ww, wh;
        QCOORD	vx, vy, vw, vh;
        QWMatrix	wxmat;

        // Cached composition (and inverse) of transformations
        QWMatrix	xmat;
        QWMatrix	ixmat;

        double	m11() const { return xmat.m11(); }
        double      m12() const { return xmat.m12(); }
        double      m21() const { return xmat.m21(); }
        double      m22() const { return xmat.m22(); }
        double      dx() const { return xmat.dx(); }
        double      dy() const { return xmat.dy(); }
        double	im11() const { return ixmat.m11(); }
        double      im12() const { return ixmat.m12(); }
        double      im21() const { return ixmat.m21(); }
        double      im22() const { return ixmat.m22(); }
        double      idx() const { return ixmat.dx(); }
        double      idy() const { return ixmat.dy(); }

        int		txop;
        bool	txinv;

    #else
        // even without transformations we still have translations
        int		xlatex;
        int		xlatey;
    #endif

        void       *penRef;				// pen cache ref
        void       *brushRef;			// brush cache ref
        void       *ps_stack;
        void       *wm_stack;
        void	killPStack();

    protected:
    #ifdef Q_OS_TEMP
        QPoint	internalCurrentPos;
        uint	old_pix;			// ### All win platforms in 4.0
    #endif
    #if defined(Q_WS_WIN)
        friend class QFontEngineWin;
        friend class QFontEngineBox;
        QT_WIN_PAINTER_MEMBERS
    #elif defined(Q_WS_X11)
        friend class QFontEngineXLFD;
        friend class QFontEngineXft;
        friend class QFontEngineBox;
        Display    *dpy;				// current display
        int		scrn;				// current screen
        Qt::HANDLE	hd;				// handle to drawable
        Qt::HANDLE  rendhd;				// handle to Xft draw
        GC		gc;				// graphics context (standard)
        GC		gc_brush;			// graphics contect for brush
        QPoint	curPt;				// current point
        uint	clip_serial;			// clipping serial number
    #elif defined(Q_WS_MAC)
        Qt::HANDLE	hd;				// handle to drawable
        void initPaintDevice(bool force=FALSE, QPoint *off=NULL, QRegion *rgn=NULL);
        friend const QRegion &qt_mac_update_painter(QPainter *, bool);
        friend class QFontEngineMac;
        friend class QMacPainter;
    #elif defined(Q_WS_QWS)
        friend class QFontEngine;
        QGfx * gfx;
        friend void qwsUpdateActivePainters();
    #endif
        friend class QFontMetrics;
        friend class QFontInfo;
        friend class QTextLayout;
        friend void qt_format_text( const QFont &, const QRect &r,
    		     int tf, const QString& str, int len, QRect *brect,
    		     int tabstops, int* tabarray, int tabarraylen,
    		     QTextParag **internal, QPainter* painter );
        friend void qt_draw_background( QPainter *p, int x, int y, int w,  int h );
        friend void qt_draw_transformed_rect( QPainter *p,  int x, int y, int w,  int h, bool fill );
        friend class QPrinter;

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

        enum TransformationCodes {
    	TxNone      = 0,		// transformation codes
    	TxTranslate = 1,		// copy in qpainter_*.cpp
    	TxScale     = 2,
    	TxRotShear  = 3
        };
    };

    /*****************************************************************************
      QPainter member functions
     *****************************************************************************/

    inline QPaintDevice *QPainter::device() const
    {
        return pdev;
    }

    inline bool QPainter::isActive() const
    {
        return testf(IsActive);
    }

    inline const QFont &QPainter::font() const
    {
        return cfont;
    }

    inline const QPen &QPainter::pen() const
    {
        return cpen;
    }

    inline const QBrush &QPainter::brush() const
    {
        return cbrush;
    }

    /*
    inline PaintUnit QPainter::unit() const
    {
        return (PaintUnit)pu;
    }
    */

    inline const QColor &QPainter::backgroundColor() const
    {
        return bg_col;
    }

    inline Qt::BGMode QPainter::backgroundMode() const
    {
        return (BGMode)bg_mode;
    }

    inline Qt::RasterOp QPainter::rasterOp() const
    {
        return (RasterOp)rop;
    }

    inline const QPoint &QPainter::brushOrigin() const
    {
        return bro;
    }

    inline bool QPainter::hasViewXForm() const
    {
    #ifndef QT_NO_TRANSFORMATIONS
        return testf(VxF);
    #else
        return xlatex || xlatey;
    #endif
    }

    inline bool QPainter::hasWorldXForm() const
    {
    #ifndef QT_NO_TRANSFORMATIONS
        return testf(WxF);
    #else
        return xlatex || xlatey;
    #endif
    }

    inline double QPainter::translationX() const
    {
    #ifndef QT_NO_TRANSFORMATIONS
        return worldMatrix().dx();
    #else
        return xlatex;
    #endif
    }

    inline double QPainter::translationY() const
    {
    #ifndef QT_NO_TRANSFORMATIONS
        return worldMatrix().dy();
    #else
        return xlatey;
    #endif
    }

    inline bool QPainter::hasClipping() const
    {
        return testf(ClipOn);
    }

    inline int QPainter::tabStops() const
    {
        return tabstops;
    }

    inline int *QPainter::tabArray() const
    {
        return tabarray;
    }

    #if defined(Q_WS_WIN)
    inline HDC QPainter::handle() const
    {
        return hdc;
    }
    #elif defined(Q_WS_X11) || defined(Q_WS_MAC)
    inline Qt::HANDLE QPainter::handle() const
    {
        return hd;
    }
    #endif

    inline void QPainter::setBrushOrigin( const QPoint &p )
    {
        setBrushOrigin( p.x(), p.y() );
    }

    #ifndef QT_NO_TRANSFORMATIONS
    inline void QPainter::setWindow( const QRect &r )
    {
        setWindow( r.x(), r.y(), r.width(), r.height() );
    }

    inline void QPainter::setViewport( const QRect &r )
    {
        setViewport( r.x(), r.y(), r.width(), r.height() );
    }
    #endif

    inline void QPainter::setClipRect( int x, int y, int w, int h, CoordinateMode m )
    {
        setClipRect( QRect(x,y,w,h), m );
    }

    inline void QPainter::drawPoint( const QPoint &p )
    {
        drawPoint( p.x(), p.y() );
    }

    inline void QPainter::moveTo( const QPoint &p )
    {
        moveTo( p.x(), p.y() );
    }

    inline void QPainter::lineTo( const QPoint &p )
    {
        lineTo( p.x(), p.y() );
    }

    inline void QPainter::drawLine( const QPoint &p1, const QPoint &p2 )
    {
        drawLine( p1.x(), p1.y(), p2.x(), p2.y() );
    }

    inline void QPainter::drawRect( const QRect &r )
    {
        drawRect( r.x(), r.y(), r.width(), r.height() );
    }

    inline void QPainter::drawWinFocusRect( const QRect &r )
    {
        drawWinFocusRect( r.x(), r.y(), r.width(), r.height() );
    }

    inline void QPainter::drawWinFocusRect( const QRect &r,const QColor &penColor )
    {
        drawWinFocusRect( r.x(), r.y(), r.width(), r.height(), penColor );
    }

    inline void QPainter::drawRoundRect( const QRect &r, int xRnd, int yRnd )
    {
        drawRoundRect( r.x(), r.y(), r.width(), r.height(), xRnd, yRnd );
    }

    inline void QPainter::drawEllipse( const QRect &r )
    {
        drawEllipse( r.x(), r.y(), r.width(), r.height() );
    }

    inline void QPainter::drawArc( const QRect &r, int a, int alen )
    {
        drawArc( r.x(), r.y(), r.width(), r.height(), a, alen );
    }

    inline void QPainter::drawPie( const QRect &r, int a, int alen )
    {
        drawPie( r.x(), r.y(), r.width(), r.height(), a, alen );
    }

    inline void QPainter::drawChord( const QRect &r, int a, int alen )
    {
        drawChord( r.x(), r.y(), r.width(), r.height(), a, alen );
    }

    inline void QPainter::drawPixmap( const QPoint &p, const QPixmap &pm,
    				  const QRect &sr )
    {
        drawPixmap( p.x(), p.y(), pm, sr.x(), sr.y(), sr.width(), sr.height() );
    }

    inline void QPainter::drawImage( const QPoint &p, const QImage &pm,
                                     const QRect &sr, int conversionFlags )
    {
        drawImage( p.x(), p.y(), pm,
    	       sr.x(), sr.y(), sr.width(), sr.height(), conversionFlags );
    }

    inline void QPainter::drawTiledPixmap( const QRect &r, const QPixmap &pm,
    				       const QPoint &sp )
    {
        drawTiledPixmap( r.x(), r.y(), r.width(), r.height(), pm, sp.x(), sp.y() );
    }

    inline void QPainter::drawTiledPixmap( const QRect &r, const QPixmap &pm )
    {
        drawTiledPixmap( r.x(), r.y(), r.width(), r.height(), pm, 0, 0 );
    }

    inline void QPainter::fillRect( const QRect &r, const QBrush &brush )
    {
        fillRect( r.x(), r.y(), r.width(), r.height(), brush );
    }

    inline void QPainter::eraseRect( int x, int y, int w, int h )
    {
        fillRect( x, y, w, h, backgroundColor() );
    }

    inline void QPainter::eraseRect( const QRect &r )
    {
        fillRect( r.x(), r.y(), r.width(), r.height(), backgroundColor() );
    }

    inline void QPainter::drawText( const QPoint &p, const QString &s, int len, TextDirection dir )
    {
        drawText( p.x(), p.y(), s, 0, len, dir );
    }

    inline void QPainter::drawText( const QPoint &p, const QString &s, int pos, int len, TextDirection dir )
    {
        drawText( p.x(), p.y(), s, pos, len, dir );
    }

    inline void QPainter::drawText( int x, int y, int w, int h, int tf,
    				const QString& str, int len, QRect *br, QTextParag **i )
    {
        QRect r(x, y, w, h);
        drawText( r, tf, str, len, br, i );
    }

    inline void QPainter::drawTextItem( const QPoint& p, const QTextItem &ti, int textflags )
    {
        drawTextItem( p.x(), p.y(), ti, textflags );
    }

    inline QRect QPainter::boundingRect( int x, int y, int w, int h, int tf,
    				     const QString& str, int len, QTextParag **i )
    {
        QRect r(x, y, w, h);
        return boundingRect( r, tf, str, len, i );
    }

    #if defined(Q_WS_QWS)
    inline QGfx * QPainter::internalGfx()
    {
        return gfx;
    }
    #endif

    #endif // QPAINTER_H