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# qgfx_qws.h

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

    /****************************************************************************
    ** $Id: qt/src/kernel/qgfx_qws.h   2.3.1   edited 2001-02-15 $
    **
    ** Definition of QGfx (graphics context) class
    **
    ** Created : 940721
    **
    ** 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 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 for Qt/Embedded may use this file in accordance with the
    ** Qt Embedded 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/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 QGFX_H
    #define QGFX_H

    #ifndef QT_H
    #include "qwidget.h"
    #include "qnamespace.h"
    #include "qimage.h"
    #include "qfontmanager_qws.h"
    #endif // QT_H

    #if !defined( QT_NO_IMAGE_16_BIT ) || !defined( QT_NO_QWS_DEPTH_16 )
    # ifndef QT_QWS_DEPTH16_RGB
    #  define QT_QWS_DEPTH16_RGB 565
    # endif
    static const int qt_rbits = (QT_QWS_DEPTH16_RGB/100);
    static const int qt_gbits = (QT_QWS_DEPTH16_RGB/10%10);
    static const int qt_bbits = (QT_QWS_DEPTH16_RGB%10);
    static const int qt_red_shift = qt_bbits+qt_gbits-(8-qt_rbits);
    static const int qt_green_shift = qt_bbits-(8-qt_gbits);
    static const int qt_neg_blue_shift = 8-qt_bbits;
    static const int qt_blue_mask = (1<<qt_bbits)-1;
    static const int qt_green_mask = (1<<(qt_gbits+qt_bbits))-((1<<qt_bbits)-1);
    static const int qt_red_mask = (1<<(qt_rbits+qt_gbits+qt_bbits))-(1<<(qt_gbits+qt_bbits));

    inline ushort qt_convRgbTo16( const int r, const int g, const int b )
    {
        const int tr = r << qt_red_shift;
        const int tg = g << qt_green_shift;
        const int tb = b >> qt_neg_blue_shift;

        return (tb & qt_blue_mask) | (tg & qt_green_mask) | (tr & qt_red_mask);
    }

    inline ushort qt_convRgbTo16( QRgb c )
    {
        const int tr = qRed(c) << qt_red_shift;
        const int tg = qGreen(c) << qt_green_shift;
        const int tb = qBlue(c) >> qt_neg_blue_shift;

        return (tb & qt_blue_mask) | (tg & qt_green_mask) | (tr & qt_red_mask);
    }

    inline QRgb qt_conv16ToRgb( ushort c )
    {
        const int r=(c & qt_red_mask);
        const int g=(c & qt_green_mask);
        const int b=(c & qt_blue_mask);
        const int tr = r >> qt_red_shift;
        const int tg = g >> qt_green_shift;
        const int tb = b << qt_neg_blue_shift;

        return qRgb(tr,tg,tb);
    }

    inline void qt_conv16ToRgb( ushort c, int& r, int& g, int& b )
    {
        const int tr=(c & qt_red_mask);
        const int tg=(c & qt_green_mask);
        const int tb=(c & qt_blue_mask);
        r = tr >> qt_red_shift;
        g = tg >> qt_green_shift;
        b = tb << qt_neg_blue_shift;
    }
    #endif

    const int SourceSolid=0;
    const int SourcePixmap=1;

    #ifndef QT_NO_QWS_CURSOR

    extern bool qt_sw_cursor;

    class QGfxRasterBase;

    #define SW_CURSOR_DATA_SIZE     4096  // 64x64 8-bit cursor

    class SWCursorData;

    class QScreenCursor
    {
    public:
        QScreenCursor( );
        virtual ~QScreenCursor();

        virtual void init(SWCursorData *da, bool init = FALSE);

        virtual void set( const QImage &image, int hotx, int hoty );
        virtual void move( int x, int y );
        virtual void show();
        virtual void hide();

        virtual bool restoreUnder( const QRect &r, QGfxRasterBase *g = 0 );
        virtual void saveUnder();
        virtual void drawCursor();
        void draw();
        virtual bool supportsAlphaCursor();

        static bool enabled() { return qt_sw_cursor; }

    protected:
        QGfxRasterBase *gfx;
        QGfxRasterBase *gfxunder;

        QImage *imgunder;
        const QImage *cursor;

        uchar *fb_start;
        uchar *fb_end;
        bool save_under;
        SWCursorData *data;

        int clipWidth;
        int clipHeight;
        int myoffset;

    };

    extern QScreenCursor * qt_screencursor;

    #endif // QT_NO_QWS_CURSOR

    struct fb_cmap;

    // A (used) chunk of offscreen memory

    class QPoolEntry {

    public:

        unsigned int start;
        unsigned int end;

    };

    class QScreen {

    public:

        QScreen( int display_id );
        virtual ~QScreen();
        virtual bool initDevice() = 0;
        virtual bool connect( const QString &displaySpec ) = 0;
        virtual void disconnect() = 0;
        virtual int initCursor(void *, bool=FALSE);
        virtual void shutdownDevice();
        virtual void setMode(int,int,int) = 0;
        virtual bool supportsDepth(int) const;
        virtual QGfx * createGfx(unsigned char *,int,int,int,int);
        virtual QGfx * screenGfx();
        virtual void save();
        virtual void restore();
        virtual void blank(bool on);

        virtual int pixmapOffsetAlignment() { return 64; }
        virtual int pixmapLinestepAlignment() { return 64; }

        virtual bool onCard(unsigned char *) const;
        virtual bool onCard(unsigned char *, ulong& out_offset) const;

        // sets a single color in the colormap
        virtual void set(unsigned int,unsigned int,unsigned int,unsigned int);
        // allocates a color
        virtual int alloc(unsigned int,unsigned int,unsigned int);

        int width() const { return w; }
        int height() const { return h; }
        int depth() const { return d; }
        virtual int pixmapDepth() const;
        int pixelType() const { return pixeltype; }
        int linestep() const { return lstep; }
        int deviceWidth() const { return dw; }
        int deviceHeight() const { return dh; }
        uchar * base() const { return data; }
        // Ask for memory from card cache with alignment
        virtual uchar * cache(int,int) { return 0; }
        virtual void uncache(uchar *) {}

        int screenSize() const { return size; }
        int totalSize() const { return mapsize; }

        QRgb * clut() { return screenclut; }
        int numCols() { return screencols; }

        virtual QSize mapToDevice( const QSize & ) const;
        virtual QSize mapFromDevice( const QSize & ) const;
        virtual QPoint mapToDevice( const QPoint &, const QSize & ) const;
        virtual QPoint mapFromDevice( const QPoint &, const QSize & ) const;
        virtual QRect mapToDevice( const QRect &, const QSize & ) const;
        virtual QRect mapFromDevice( const QRect &, const QSize & ) const;
        virtual QImage mapToDevice( const QImage & ) const;
        virtual QImage mapFromDevice( const QImage & ) const;
        virtual QRegion mapToDevice( const QRegion &, const QSize & ) const;
        virtual QRegion mapFromDevice( const QRegion &, const QSize & ) const;
        virtual int transformOrientation() const;
        virtual bool isTransformed() const;

        virtual bool isInterlaced() const;

    protected:

        QRgb screenclut[256];
        int screencols;

        bool initted;

        uchar * data;

        // Table of allocated lumps, kept in sorted highest-to-lowest order
        // The table itself is allocated at the bottom of offscreen memory
        // i.e. it's similar to having a stack (the table) and a heap
        // (the allocated blocks). Freed space is implicitly described
        // by the gaps between the allocated lumps (this saves entries and
        // means we don't need to worry about coalescing freed lumps)

        QPoolEntry * entries;
        int * entryp;
        unsigned int * lowest;

        int w;
        int lstep;
        int h;
        int d;
        int pixeltype;

        int dw;
        int dh;

        int hotx;
        int hoty;
        QImage cursor;

        int size;          // Screen size
        int mapsize;       // Total mapped memory

        int displayId;
    };

    extern QScreen * qt_screen;

    class Q_EXPORT QGfx : public Qt {
    public:
        // With loadable drivers, do probe here
        static QGfx *createGfx( int depth, unsigned char *buffer,
                                int w, int h, int linestep );

        virtual ~QGfx() {}

        virtual void setPen( const QPen & )=0;
        virtual void setFont( const QFont & )=0;
        virtual void setBrush( const QBrush & )=0;
        virtual void setBrushPixmap( const QPixmap * )=0;
        virtual void setBrushOffset( int, int ) = 0;
        virtual void setClipRect( int,int,int,int )=0;
        virtual void setClipRegion( const QRegion & )=0;
        virtual void setClipping (bool)=0;
        // These will be called from qwidget_qws or qwidget_mac
        // to update the drawing area when a widget is moved
        virtual void setOffset( int,int )=0;
        virtual void setWidgetRect( int,int,int,int )=0;
        virtual void setWidgetRegion( const QRegion & )=0;
        virtual void setSourceWidgetOffset(int x, int y) = 0;
        virtual void setGlobalRegionIndex( int idx ) = 0;

        virtual void setDashedLines(bool d) = 0;
        virtual void setDashes(char *, int) = 0;

        virtual void setOpaqueBackground(bool b)=0;
        virtual void setBackgroundColor(QColor c)=0;

        // Drawing operations
        virtual void drawPoint( int,int )=0;
        virtual void drawPoints( const QPointArray &,int,int )=0;
        virtual void moveTo( int,int )=0;
        virtual void lineTo( int,int )=0;
        virtual void drawLine( int,int,int,int )=0;
        virtual void drawPolyline( const QPointArray &,int,int )=0;

        // Fill operations - these use the current source (pixmap,
        // color, etc), and draws outline
        virtual void fillRect( int,int,int,int )=0;
        virtual void drawPolygon( const QPointArray &,bool,int,int )=0;

        virtual void setLineStep(int)=0;

        // Special case of rect-with-pixmap-fill for speed/hardware acceleration
        virtual void blt( int,int,int,int,int,int )=0;
        virtual void scroll( int,int,int,int,int,int )=0;

    #if !defined(QT_NO_MOVIE) || !defined(QT_NO_TRANSFORMATIONS)
        virtual void stretchBlt( int,int,int,int,int,int )=0;
    #endif
        virtual void tiledBlt( int,int,int,int )=0;

        enum SourceType { SourcePen, SourceImage, SourceAccel };
        enum PixelType { NormalPixel, BGRPixel };

        // Setting up source data - can be solid color or pixmap data
        virtual void setSource(const QPaintDevice *)=0;
        virtual void setSource(const QImage *)=0;
        // This one is pen
        virtual void setSourcePen()=0;

        virtual void drawAlpha(int,int,int,int,int,int,int,int) {}

        virtual void hsync(int) {}

        // These apply only to blt's. For alpha values for general
        // drawing operations we should probably have a separate QGfx
        // class. It's not a high priority though.

        // Enum values: Ignore alpha information, alpha information encoded in
        // 32-bit rgba along with colors, alpha information in 8bpp
        // format in alphabits

        enum AlphaType { IgnoreAlpha, InlineAlpha, SeparateAlpha,
                         LittleEndianMask, BigEndianMask, SolidAlpha };

        // Can be no alpha, inline (32bit data), separate (for images),
        // LittleEndianMask/BigEndianMask 1bpp masks, constant alpha
        // value
        virtual void setAlphaType(AlphaType)=0;
        // Pointer to data, linestep
        virtual void setAlphaSource(unsigned char *,int)=0;
        virtual void setAlphaSource(int,int=-1,int=-1,int=-1)=0;

        virtual void drawText( int,int,const QString & )=0;

        virtual void setClut(QRgb *,int)=0;

        // Save and restore pen and brush state - necessary when setting
        // up a bitBlt for example
        virtual void save()=0;
        virtual void restore()=0;

        virtual void setRop(RasterOp)=0;

        bool isScreenGfx() { return is_screen_gfx; } //for cursor..

    protected:
        bool is_screen_gfx;
    };

    // This lives in loadable modules

    #ifndef QT_LOADABLE_MODULES
    extern "C" QScreen * qt_get_screen( int display_id, const char* spec );
    #endif

    // This is in main lib, loads the right module, calls qt_get_screen
    // In non-loadable cases just aliases to qt_get_screen

    const unsigned char * qt_probe_bus();

    #endif