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

Copyright (C) 2007 Lubos Lunak <l.lunak@kde.org>

You can Freely distribute this program under the GNU General Public
License. See the file "COPYING" for the exact licensing terms.
******************************************************************/

#include "flame.h"

#include <deleted.h>
#include <scene_opengl.h>

namespace KWin
{

void FlameEffect::prePaintScreen( int* mask, QRegion* region, int time )
    {
    if( !windows.isEmpty())
        *mask |= Scene::PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS;
    effects->prePaintScreen(mask, region, time);
    }

void FlameEffect::prePaintWindow( EffectWindow* w, int* mask, QRegion* paint, QRegion* clip, int time )
    {
    if( windows.contains( w ))
        {
        SceneOpenGL::Window* glwin = dynamic_cast< SceneOpenGL::Window* >( w->sceneWindow());
        if( glwin )
            {
            if( windows[ w ] < 1 )
                {
                windows[ w ] += time / 500.;
                *mask |= Scene::PAINT_WINDOW_TRANSFORMED;
                glwin->enablePainting( Scene::Window::PAINT_DISABLED_BY_DELETE );
                // Request the window to be divided into cells
                glwin->requestVertexGrid( qMax( glwin->height() / 50, 5 ));
                }
            else
                {
                windows.remove( w );
                static_cast< Deleted* >( w->window())->unrefWindow();
                }
            }
        }
    effects->prePaintWindow( w, mask, paint, clip, time );
    }

void FlameEffect::paintWindow( EffectWindow* w, int mask, QRegion region, WindowPaintData& data )
    {
    if( windows.contains( w ))
        {
        SceneOpenGL::Window* glwin = dynamic_cast< SceneOpenGL::Window* >( w->sceneWindow() );
        if( glwin )
            {
            QVector< SceneOpenGL::Window::Vertex >& vertices = glwin->vertices();
            QVector< SceneOpenGL::Window::Vertex > new_vertices;
            double ylimit = windows[ w ] * w->height(); // parts above this are already away
            assert( vertices.count() % 4 == 0 );
            for( int i = 0;
                 i < vertices.count();
                 i += 4 )
                {
                bool is_in = false;
                for( int j = 0;
                     j < 4;
                     ++j )
                    if( vertices[ i + j ].pos[ 1 ] >= ylimit )
                        is_in = true;
                if( !is_in )
                    continue;
                for( int j = 0;
                     j < 4;
                     ++j )
                    {
                    SceneOpenGL::Window::Vertex vertex = vertices[ i + j ];
                    new_vertices.append( vertex );
                    }
                }
            if( new_vertices.isEmpty())
                return; // nothing to paint
            glwin->vertices() = new_vertices;
            glwin->markVerticesDirty();
            }
        }
    effects->paintWindow( w, mask, region, data );
    }

void FlameEffect::postPaintWindow( EffectWindow* w )
    {
    if( windows.contains( w ))
        workspace()->addRepaint( w->geometry()); // workspace, since the window under it will need painting too
    effects->postPaintScreen();
    }

void FlameEffect::windowClosed( EffectWindow* c )
    {
    windows[ c ] = 0;
    static_cast< Deleted* >( c->window())->refWindow();
    }

void FlameEffect::windowDeleted( EffectWindow* c )
    {
    windows.remove( c );
    }

} // namespace