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QFrameBuffer.cpp

00001  /***********************************************************************
00002  *                                                                      *
00003  * ViTooKi                                                              *
00004  *                                                                      *
00005  * title:    QFrameBuffer.cpp                                           *
00006  *                                                                      *
00007  *                                                                      *
00008  *                                                                      *
00009  * ITEC institute of the University of Klagenfurt (Austria)             *
00010  * http://www.itec.uni-klu.ac.at                                        *
00011  *                                                                      *
00012  *                                                                      *
00013  * For more information visit the ViTooKi homepage:                     *
00014  * http://ViTooKi.sourceforge.net                                       *
00015  * vitooki-user@lists.sourceforge.net                                   *
00016  * vitooki-devel@lists.sourceforge.net                                  *
00017  *                                                                      *
00018  * This file is part of ViTooKi, a free video toolkit.                  *
00019  * ViTooKi is free software; you can redistribute it and/or             *
00020  * modify it under the terms of the GNU General Public License          *
00021  * as published by the Free Software Foundation; either version 2       *
00022  * of the License, or (at your option) any later version.               *
00023  *                                                                      *
00024  * This program is distributed in the hope that it will be useful,      *
00025  * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
00026  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the         *
00027  * GNU General Public License for more details.                         *
00028  *                                                                      *
00029  * You should have received a copy of the GNU General Public License    *
00030  * along with this program; if not, write to the Free Software          *
00031  * Foundation, Inc., 59 Temple Place - Suite 330, Boston,               *
00032  * MA  02111-1307, USA.                                                 *
00033  *                                                                      *
00034  ***********************************************************************/
00035 
00036  /***********************************************************************
00037  *                                                                      *
00038  *  REVISION HISTORY:                                                   *
00039  *                                                                      *
00040  *  $Id: QFrameBuffer.cpp,v 1.4 2005/02/22 18:26:10 mkropfbe Exp $
00041  *                                                                      *
00042  ***********************************************************************/
00043 
00044 #include <qapplication.h>
00045 #include <qevent.h>
00046 #include <qimage.h>
00047 #include <qlabel.h>
00048 #include <qpixmap.h>
00049 #include "global.hpp"
00050 #include "IO.hpp"
00051 #include "Frame.hpp"
00052 #include "QFrameBuffer.hpp"
00053 #include "VideoFrameBuffer.hpp"
00054 
00055 
00056 
00057 /*------------ QFrameBuffer methods --------------------------------------- */
00058 
00059 QFrameBuffer::QFrameBuffer(QLabel *qlabel, int depth, int numColors, bool gray,
00060                            QEvent::Type eventType)
00061   : QWidget(qlabel), VideoFrameBuffer(gray) {
00062 
00063   this->qlabel = qlabel;
00064   this->eventType = eventType;
00065   int real_depth = (depth == 24) ? 32 : depth;
00066   image = new QImage(qlabel->width(), qlabel->height(), real_depth, numColors);
00067   if (depth == 24)
00068     image->setAlphaBuffer(false);
00069   if (numColors > 0 && gray) {
00070     // initialize the color table to gray values
00071     int i;
00072     QRgb *ct = image->colorTable();
00073     for (i=0; i < numColors; i++)
00074       ct[i] = qRgb(i, i, i);
00075   }
00076   hide();                       // this widget should never be visible!
00077 }
00078 
00079 QFrameBuffer::~QFrameBuffer()
00080 {
00081   delete image;
00082 }
00083 
00084 /* 
00085  * QApplication::postEvent() is thread-safe.
00086  */
00087 void QFrameBuffer::postPaintEvent()
00088 {
00089   /* request repainting of qlabel without erasing it before */
00090   QApplication::postEvent(this, new QCustomEvent(eventType));
00091 }
00092 
00093 void QFrameBuffer::customEvent(QCustomEvent *event)
00094 {
00095   int rval;
00096   if (event->type() != eventType)
00097     return;
00098   lock();
00099         // bitblt into display
00100   rval = qlabel->pixmap()->convertFromImage(*image, 0);
00101   unlock();
00102   if (rval) {
00103     dprintf_full("QFrameBuffer::customEvent() repainting qlabel\n");
00104     /* repaint qlabel immediately, without erasing it before */
00105     QPaintEvent paintEvent(qlabel->visibleRect(), false);
00106     QApplication::sendEvent(qlabel, &paintEvent);
00107   } else {
00108     dprintf_err("QFrameBuffer::paintEvent(): convertFromImage() failed!\n");
00109   }
00110 }