/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 2007 Lubos Lunak <l.lunak@kde.org>
Copyright (C) 2007 Christian Nitschkowski <christian.nitschkowski@kdemail.net>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/

#include "diminactive.h"

#include <kconfiggroup.h>

namespace KWin
{

KWIN_EFFECT( diminactive, DimInactiveEffect )

DimInactiveEffect::DimInactiveEffect()
    {
    reconfigure( ReconfigureAll );
    timeline.setDuration( animationTime( 250 ));
    previousActiveTimeline.setDuration( animationTime( 250 ));
    active = effects->activeWindow();
    previousActive = NULL;
    }

void DimInactiveEffect::reconfigure( ReconfigureFlags )
    {
    KConfigGroup conf = EffectsHandler::effectConfig("DimInactive");
    dim_panels = conf.readEntry("DimPanels", false);
    dim_desktop = conf.readEntry("DimDesktop", false);
    dim_by_group = conf.readEntry("DimByGroup", true);
    dim_strength = conf.readEntry("Strength", 25);
    }

void DimInactiveEffect::prePaintScreen( ScreenPrePaintData& data, int time )
    {
    double oldValue = timeline.value();
    if( effects->activeFullScreenEffect() )
        timeline.removeTime( time );
    else
        timeline.addTime( time );
    if( oldValue != timeline.value() )
        effects->addRepaintFull();
    if( previousActive )
        { // We are fading out the previous window
        previousActive->addRepaintFull();
        previousActiveTimeline.addTime( time );
        }
    effects->prePaintScreen( data, time );
    }

void DimInactiveEffect::paintWindow( EffectWindow* w, int mask, QRegion region, WindowPaintData& data )
    {
    if( dimWindow( w ) || w == previousActive )
        {
        double previous = 1.0;
        if( w == previousActive )
            previous = previousActiveTimeline.value();
        if( previousActiveTimeline.value() == 1.0 )
            previousActive = NULL;
        data.brightness *= (1.0 - (dim_strength / 100.0) * timeline.value() * previous );
        data.saturation *= (1.0 - (dim_strength / 100.0) * timeline.value() * previous );
        }
    effects->paintWindow( w, mask, region, data );
    }

bool DimInactiveEffect::dimWindow( const EffectWindow* w ) const
    {
    if( active == w )
        return false; // never dim active window
    if( active && dim_by_group && active->group() == w->group())
        return false; // don't dim in active group if configured so
    if( w->isDock() && !dim_panels )
        return false; // don't dim panels if configured so
    if( w->isDesktop() && !dim_desktop )
        return false; // don't dim the desktop if configured so
    if( !w->isNormalWindow() && !w->isDialog() && !w->isDock() && !w->isDesktop())
        return false; // don't dim more special window types
    // don't dim unmanaged windows, grouping doesn't work for them and maybe dimming
    // them doesn't make sense in general (they should be short-lived anyway)
    if( !w->isManaged())
        return false;
    return true; // dim the rest
    }

void DimInactiveEffect::windowActivated( EffectWindow* w )
    {
    if( active != NULL )
        {
        previousActive = active;
        previousActiveTimeline.setProgress( 0.0 );

        if( dim_by_group )
            {
            if(( w == NULL || w->group() != active->group()) && active->group() != NULL )
                { // repaint windows that are no longer in the active group
                foreach( EffectWindow* tmp, active->group()->members())
                    tmp->addRepaintFull();
                }
            }
        else
            active->addRepaintFull();
        }
    active = w;
    if( active != NULL )
        {
        if( dim_by_group )
            {
            if( active->group() != NULL )
                { // repaint newly active windows
                foreach( EffectWindow* tmp, active->group()->members())
                    tmp->addRepaintFull();
                }
            }
        else
            active->addRepaintFull();
       }
    }

} // namespace