/****************************************************************************
 **
 ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the example classes of the Qt Toolkit.
 **
 ** This file may be used under the terms of the GNU General Public
 ** License version 2.0 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of
 ** this file.  Please review the following information to ensure GNU
 ** General Public Licensing requirements will be met:
 ** http://trolltech.com/products/qt/licenses/licensing/opensource/
 **
 ** If you are unsure which license is appropriate for your use, please
 ** review the following information:
 ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
 ** or contact the sales department at sales@trolltech.com.
 **
 ** In addition, as a special exception, Trolltech gives you certain
 ** additional rights. These rights are described in the Trolltech GPL
 ** Exception version 1.0, which can be found at
 ** http://www.trolltech.com/products/qt/gplexception/ and in the file
 ** GPL_EXCEPTION.txt in this package.
 **
 ** In addition, as a special exception, Trolltech, as the sole copyright
 ** holder for Qt Designer, grants users of the Qt/Eclipse Integration
 ** plug-in the right for the Qt/Eclipse Integration to link to
 ** functionality provided by Qt Designer and its related libraries.
 **
 ** Trolltech reserves all rights not expressly granted herein.
 **
 ** Trolltech ASA (c) 2007
 **
 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ****************************************************************************/
 
 #include "svgalibscreen.h"
 #include "svgalibsurface.h"
 
 #include <QVector>
 #include <QApplication>
 #include <QColor>
 #include <QWidget>
 
 bool SvgalibScreen::connect(const QString &amp;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 &amp; 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 &amp;color, const QRegion &amp;reg)
 {
     if (depth() != 32 &amp;&amp; depth() != 16) {
         if (base())
             QScreen::solidFill(color, reg);
         return;
     }
 
     const QVector<QRect> rects = (reg &amp; 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 &amp;img, const QPoint &amp;topLeft,
                          const QRegion &amp;reg)
 {
     if (img.format() != pixelFormat()) {
         if (base())
             QScreen::blit(img, topLeft, reg);
         return;
     }
 
     const QVector<QRect> rects = (reg &amp; 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 &amp;key) const
 {
     if (key == QLatin1String("svgalib"))
         return new SvgalibSurface;
     return QScreen::createSurface(key);
 }