workspace/kwin/effects/test/demo_showpicture.cpp

   1 /*****************************************************************
   2  KWin - the KDE window manager
   3  This file is part of the KDE project.
   4
   5 Copyright (C) 2007 Lubos Lunak <l.lunak@kde.org>
   6
   7 You can Freely distribute this program under the GNU General Public
   8 License. See the file "COPYING" for the exact licensing terms.
   9 ******************************************************************/
  10
  11 #include "demo_showpicture.h"
  12
  13 #include <kstandarddirs.h>
  14 #include <qimage.h>
  15
  16 namespace KWin
  17 {
  18
  19 KWIN_EFFECT( demo_showpicture, ShowPictureEffect )
  20
  21 ShowPictureEffect::ShowPictureEffect()
  22     : init( true )
  23     , picture( NULL )
  24     {
  25     }
  26
  27 ShowPictureEffect::~ShowPictureEffect()
  28     {
  29     delete picture;
  30     }
  31
  32 void ShowPictureEffect::paintScreen( int mask, QRegion region, ScreenPaintData& data )
  33     {
  34     effects->paintScreen( mask, region, data );
  35     if( init )
  36         {
  37         loadPicture();
  38         init = false;
  39         }
  40     if( picture && region.intersects( pictureRect ))
  41         {
  42         glPushAttrib( GL_CURRENT_BIT | GL_ENABLE_BIT );
  43         picture->bind();
  44         glEnable( GL_BLEND );
  45         glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
  46         picture->render( region, pictureRect );
  47         picture->unbind();
  48         glPopAttrib();
  49         }
  50     }
  51
  52 void ShowPictureEffect::loadPicture()
  53     {
  54     QString file = KGlobal::dirs()->findResource( "appdata", "showpicture.png" );
  55     if( file.isEmpty())
  56         return;
  57     QImage im( file );
  58     QRect area = effects->clientArea( PlacementArea, effects->activeScreen(), effects->currentDesktop());
  59     picture = new GLTexture( im );
  60     pictureRect = QRect( area.x() + ( area.width() - im.width()) / 2,
  61         area.y() + ( area.height() - im.height()) / 2, im.width(), im.height());
  62     }
  63
  64 } // namespace