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svgalibscreen.cpp Example File
^{qtopiacore/svgalib/svgalibscreen.cpp}

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 ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the example classes of the Qt Toolkit.
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 ** License version 2.0 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of
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 ** review the following information:
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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;

     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)) {
         qCritical("SvgalibScreen::initDevice(): graphics memory not linear");
         return false;
     }
     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) {
         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)
 {
     bool do_fallback = true;

     if (depth() == 16 && img.format() == QImage::Format_RGB16)
         do_fallback = false;
     if (depth() == 32 && img.format() == QImage::Format_ARGB32_Premultiplied)
         do_fallback = false;

     if (do_fallback) {
         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
 {
     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);
 }