workspace/ksmserver/curtaineffect.cpp

   1 /*
   2  * Copyright © 2008 Fredrik Höglund <fredrik@kde.org>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a copy
   5  * of this software and associated documentation files (the "Software"), to deal
   6  * in the Software without restriction, including without limitation the rights
   7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   8  * copies of the Software, and to permit persons to whom the Software is
   9  * furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  17  * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  18  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  */
  21
  22 #include "curtaineffect.h"
  23 #include "curtaineffect.moc"
  24
  25 #include <QApplication>
  26 #include <QDesktopWidget>
  27 #include <QWidget>
  28 #include <QImage>
  29 #include <QPixmap>
  30 #include <QPainter>
  31 #include <QTimer>
  32
  33 #include <qimageblitz.h>
  34
  35 CurtainEffect::CurtainEffect(QWidget *parent, QPixmap *pixmap)
  36     : LogoutEffect(parent, pixmap)
  37 {
  38 }
  39
  40 void CurtainEffect::start()
  41 {
  42     currentY = 0;
  43     nextFrame();
  44     emit initialized();
  45 }
  46
  47 void CurtainEffect::nextFrame()
  48 {
  49     QImage image = QPixmap::grabWindow(QApplication::desktop()->winId(), 0, currentY,
  50                                        parent->width(), 10 ).toImage();
  51     Blitz::intensity(image, -0.4);
  52     Blitz::grayscale(image);
  53
  54     QPainter painter(pixmap);
  55     painter.drawImage(0, currentY, image);
  56     painter.end();
  57
  58     currentY += 10;
  59     parent->update(0, 0, parent->width(), currentY);
  60
  61     QTimer::singleShot(5, this, SLOT(nextFrame()));
  62 }
  63