Qt 4.8: dbscreen.cpp Example File (qws/dbscreen/dbscreen.cpp)

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# dbscreen.cpp Example File

qws/dbscreen/dbscreen.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
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     #include "dbscreen.h"
     #include <QApplication>

     bool DBScreen::initDevice()
     {
         if (!QLinuxFbScreen::initDevice())
             return false;

         QScreenCursor::initSoftwareCursor();
         image = new QImage(deviceWidth(), deviceHeight(), pixelFormat());
         painter = new QPainter(image);

         return true;
     }

     void DBScreen::shutdownDevice()
     {
         QLinuxFbScreen::shutdownDevice();
         delete painter;
         delete image;
     }

     void DBScreen::solidFill(const QColor &color, const QRegion &region)
     {
         QVector<QRect> rects = region.rects();
         for (int i = 0; i  < rects.size(); i++)
             painter->fillRect(rects.at(i), color);
     }

     void DBScreen::blit(const QImage &image, const QPoint &topLeft, const QRegion &region)
     {
         QVector<QRect> rects = region.rects();
         for (int i = 0; i < rects.size(); i++) {
             QRect destRect = rects.at(i);
             QRect srcRect(destRect.x()-topLeft.x(), destRect.y()-topLeft.y(), destRect.width(), destRect.height());
             painter->drawImage(destRect.topLeft(), image, srcRect);
         }
     }

     void DBScreen::exposeRegion(QRegion region, int changing)
     {
         QLinuxFbScreen::exposeRegion(region, changing);
         QLinuxFbScreen::blit(*image, QPoint(0, 0), region);
     }