workspace/kwin/effects/fadedesktop.cpp

   1 /********************************************************************
   2  KWin - the KDE window manager
   3  This file is part of the KDE project.
   4
   5 Copyright (C) 2009 Lucas Murray <lmurray@undefinedfire.com>
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 *********************************************************************/
  20
  21 #include "fadedesktop.h"
  22
  23 #include <math.h>
  24
  25 namespace KWin
  26 {
  27
  28 KWIN_EFFECT( fadedesktop, FadeDesktopEffect )
  29
  30 FadeDesktopEffect::FadeDesktopEffect()
  31     : m_fading( false )
  32     {
  33     m_timeline.setCurveShape( TimeLine::LinearCurve );
  34     reconfigure( ReconfigureAll );
  35     }
  36
  37 void FadeDesktopEffect::reconfigure( ReconfigureFlags )
  38     {
  39     m_timeline.setDuration( animationTime( 250 ));
  40     }
  41
  42 void FadeDesktopEffect::prePaintScreen( ScreenPrePaintData &data, int time )
  43     {
  44     if( m_fading )
  45         {
  46         m_timeline.addTime( time );
  47
  48         // PAINT_SCREEN_BACKGROUND_FIRST is needed because screen will be actually painted more than once,
  49         // so with normal screen painting second screen paint would erase parts of the first paint
  50         if( m_timeline.value() != 1.0 )
  51             data.mask |= PAINT_SCREEN_TRANSFORMED | PAINT_SCREEN_BACKGROUND_FIRST;
  52         else
  53             {
  54             m_fading = false;
  55             m_timeline.setProgress( 0.0 );
  56             effects->setActiveFullScreenEffect( NULL );
  57             }
  58         }
  59     effects->prePaintScreen( data, time );
  60     }
  61
  62 void FadeDesktopEffect::postPaintScreen()
  63     {
  64     if( m_fading )
  65         effects->addRepaintFull();
  66     effects->postPaintScreen();
  67     }
  68
  69 void FadeDesktopEffect::prePaintWindow( EffectWindow *w, WindowPrePaintData &data, int time )
  70     {
  71     if( m_fading )
  72         {
  73         if( w->isOnDesktop( m_oldDesktop ))
  74             w->enablePainting( EffectWindow::PAINT_DISABLED_BY_DESKTOP );
  75         data.setTranslucent();
  76         }
  77     effects->prePaintWindow( w, data, time );
  78     }
  79
  80 void FadeDesktopEffect::paintWindow( EffectWindow *w, int mask, QRegion region, WindowPaintData &data )
  81     {
  82     if( m_fading && !( w->isOnCurrentDesktop() && w->isOnDesktop( m_oldDesktop )))
  83         {
  84         if( w->isOnDesktop( m_oldDesktop ))
  85             data.opacity *= 1 - m_timeline.value();
  86         else
  87             data.opacity *= m_timeline.value();
  88         }
  89     effects->paintWindow( w, mask, region, data );
  90     }
  91
  92 void FadeDesktopEffect::desktopChanged( int old )
  93     {
  94     if( effects->activeFullScreenEffect() && effects->activeFullScreenEffect() != this )
  95         return;
  96
  97     // TODO: Fix glitches when fading while a previous fade is still happening
  98
  99     effects->setActiveFullScreenEffect( this );
 100     m_fading = true;
 101     m_timeline.setProgress( 0 );
 102     m_oldDesktop = old;
 103
 104     effects->addRepaintFull();
 105     }
 106
 107 } // namespace
 108
 109 #include "fadedesktop.moc"