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# svgalibscreen.cpp Example File
qtopiacore/svgalib/svgalibscreen.cpp

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     #include "svgalibscreen.h"
     #include "svgalibsurface.h"

     #include <QVector>
     #include <QApplication>
     #include <QColor>
     #include <QWidget>

     bool SvgalibScreen::connect(const QString &displaySpec)
     {
         Q_UNUSED(displaySpec);

         int mode = vga_getdefaultmode();
         if (mode <= 0) {
             qCritical("SvgalibScreen::connect(): invalid vga mode");
             return false;
         }

         vga_modeinfo *modeinfo = vga_getmodeinfo(mode);

         QScreen::lstep = modeinfo->linewidth;
         QScreen::dw = QScreen::w = modeinfo->width;
         QScreen::dh = QScreen::h = modeinfo->height;
         QScreen::d = modeinfo->bytesperpixel * 8;
         QScreen::size = QScreen::lstep * dh;
         QScreen::data = 0;

         switch (depth()) {
         case 32:
             setPixelFormat(QImage::Format_ARGB32_Premultiplied);
             break;
         case 16:
             setPixelFormat(QImage::Format_RGB16);
             break;
         default:
             break;
         }

         const int dpi = 72;
         QScreen::physWidth = qRound(QScreen::dw * 25.4 / dpi);
         QScreen::physHeight = qRound(QScreen::dh * 25.4 / dpi);

         return true;
     }

     bool SvgalibScreen::initDevice()
     {
         if (vga_init() != 0) {
             qCritical("SvgalibScreen::initDevice(): unable to initialize svgalib");
             return false;
         }

         int mode = vga_getdefaultmode();
         if (vga_setmode(mode) == -1) {
             qCritical("SvgalibScreen::initialize(): unable to set graphics mode");
             return false;
         }

         if (gl_setcontextvga(mode) != 0) {
             qCritical("SvgalibScreen::initDevice(): unable to set vga context");
             return false;
         }
         context = gl_allocatecontext();
         gl_getcontext(context);

         vga_modeinfo *modeinfo = vga_getmodeinfo(mode);
         if (modeinfo->flags & IS_LINEAR)
             QScreen::data = vga_getgraphmem();

         QScreenCursor::initSoftwareCursor();
         return true;
     }

     void SvgalibScreen::shutdownDevice()
     {
         gl_freecontext(context);
         vga_setmode(TEXT);
     }

     void SvgalibScreen::disconnect()
     {
     }

     void SvgalibScreen::exposeRegion(QRegion region, int changing)
     {
         QScreen::exposeRegion(region, changing);
         // flip between buffers if implementing a double buffered driver
     }

     void SvgalibScreen::solidFill(const QColor &color, const QRegion &reg)
     {
         if (depth() != 32 && depth() != 16) {
             if (base())
                 QScreen::solidFill(color, reg);
             return;
         }

         const QVector<QRect> rects = (reg & region()).rects();
         for (int i = 0; i < rects.size(); ++i) {
             const QRect r = rects.at(i);
             gl_fillbox(r.left(), r.top(), r.width(), r.height(), color.rgba());
         }
     }

     void SvgalibScreen::blit(const QImage &img, const QPoint &topLeft,
                              const QRegion &reg)
     {
         if (img.format() != pixelFormat()) {
             if (base())
                 QScreen::blit(img, topLeft, reg);
             return;
         }

         const QVector<QRect> rects = (reg & region()).rects();

         for (int i = 0; i < rects.size(); ++i) {
             const QRect r = rects.at(i);
             gl_putboxpart(r.x(), r.y(), r.width(), r.height(),
                           img.width(), img.height(),
                           static_cast<void*>(const_cast<uchar*>(img.bits())),
                           r.x() - topLeft.x(), r.y() - topLeft.y());
         }
     }

     QWSWindowSurface* SvgalibScreen::createSurface(QWidget *widget) const
     {
         if (base()) {
             static int onScreenPaint = -1;
             if (onScreenPaint == -1)
                 onScreenPaint = qgetenv("QT_ONSCREEN_PAINT").toInt();

             if (onScreenPaint > 0 || widget->testAttribute(Qt::WA_PaintOnScreen))
                 return new SvgalibSurface(widget);
         }
         return QScreen::createSurface(widget);
     }

     QWSWindowSurface* SvgalibScreen::createSurface(const QString &key) const
     {
         if (key == QLatin1String("svgalib"))
             return new SvgalibSurface;
         return QScreen::createSurface(key);
     }