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

Copyright (C) 2006 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 "kwineffects.h"

#include <QtDBus/QtDBus>
#include <QVariant>
#include <QList>

#include <kdebug.h>
#include <ksharedconfig.h>

#include <assert.h>

namespace KWin
{

void WindowPrePaintData::setTranslucent()
    {
    mask |= Effect::PAINT_WINDOW_TRANSLUCENT;
    mask &= ~Effect::PAINT_WINDOW_OPAQUE;
    clip = QRegion(); // cannot clip, will be transparent
    }

void WindowPrePaintData::setTransformed()
    {
    mask |= Effect::PAINT_WINDOW_TRANSFORMED;
    }


WindowPaintData::WindowPaintData()
    : opacity( 1.0 )
    , contents_opacity( 1.0 )
    , decoration_opacity( 1.0 )
    , xScale( 1 )
    , yScale( 1 )
    , xTranslate( 0 )
    , yTranslate( 0 )
    , saturation( 1 )
    , brightness( 1 )
    {
    }

ScreenPaintData::ScreenPaintData()
    : xScale( 1 )
    , yScale( 1 )
    , xTranslate( 0 )
    , yTranslate( 0 )
    {
    }

//****************************************
// Effect
//****************************************

Effect::Effect()
    {
    }

Effect::~Effect()
    {
    }

void Effect::windowUserMovedResized( EffectWindow* , bool, bool )
    {
    }

void Effect::windowOpacityChanged( EffectWindow*, double )
    {
    }

void Effect::windowAdded( EffectWindow* )
    {
    }

void Effect::windowClosed( EffectWindow* )
    {
    }

void Effect::windowDeleted( EffectWindow* )
    {
    }

void Effect::windowActivated( EffectWindow* )
    {
    }

void Effect::windowMinimized( EffectWindow* )
    {
    }

void Effect::windowUnminimized( EffectWindow* )
    {
    }

void Effect::windowInputMouseEvent( Window, QEvent* )
    {
    }

void Effect::grabbedKeyboardEvent( QKeyEvent* )
    {
    }

void Effect::desktopChanged( int )
    {
    }

void Effect::windowDamaged( EffectWindow*, const QRect& )
    {
    }

void Effect::windowGeometryShapeChanged( EffectWindow*, const QRect& )
    {
    }

void Effect::tabBoxAdded( int )
    {
    }

void Effect::tabBoxClosed()
    {
    }

void Effect::tabBoxUpdated()
    {
    }
bool Effect::borderActivated( ElectricBorder )
    {
    return false;
    }

void Effect::mouseChanged( const QPoint&, const QPoint&, Qt::MouseButtons, Qt::KeyboardModifiers )
    {
    }

void Effect::prePaintScreen( ScreenPrePaintData& data, int time )
    {
    effects->prePaintScreen( data, time );
    }

void Effect::paintScreen( int mask, QRegion region, ScreenPaintData& data )
    {
    effects->paintScreen( mask, region, data );
    }
    
void Effect::postPaintScreen()
    {
    effects->postPaintScreen();
    }

void Effect::prePaintWindow( EffectWindow* w, WindowPrePaintData& data, int time )
    {
    effects->prePaintWindow( w, data, time );
    }

void Effect::paintWindow( EffectWindow* w, int mask, QRegion region, WindowPaintData& data )
    {
    effects->paintWindow( w, mask, region, data );
    }

void Effect::postPaintWindow( EffectWindow* w )
    {
    effects->postPaintWindow( w );
    }

void Effect::drawWindow( EffectWindow* w, int mask, QRegion region, WindowPaintData& data )
    {
    effects->drawWindow( w, mask, region, data );
    }

QRect Effect::transformWindowDamage( EffectWindow* w, const QRect& r )
    {
    return effects->transformWindowDamage( w, r );
    }

void Effect::setPositionTransformations( WindowPaintData& data, QRect& region, EffectWindow* w,
    const QRect& r, Qt::AspectRatioMode aspect )
    {
    QSize size = w->size();
    size.scale( r.size(), aspect );
    data.xScale = size.width() / double( w->width());
    data.yScale = size.height() / double( w->height());
    int width = int( w->width() * data.xScale );
    int height = int( w->height() * data.yScale );
    int x = r.x() + ( r.width() - width ) / 2;
    int y = r.y() + ( r.height() - height ) / 2;
    region = QRect( x, y, width, height );
    data.xTranslate = x - w->x();
    data.yTranslate = y - w->y();
    }

int Effect::displayWidth()
    {
    return KWin::displayWidth();
    }

int Effect::displayHeight()
    {
    return KWin::displayHeight();
    }

QPoint Effect::cursorPos()
    {
    return effects->cursorPos();
    }

//****************************************
// EffectsHandler
//****************************************

EffectsHandler::EffectsHandler(CompositingType type)
    : current_paint_screen( 0 )
    , current_paint_window( 0 )
    , current_draw_window( 0 )
    , current_transform( 0 )
    , compositing_type( type )
    {
    if( compositing_type == NoCompositing )
        return;
    KWin::effects = this;
    }

EffectsHandler::~EffectsHandler()
    {
    // All effects should already be unloaded by Impl dtor
    assert( loaded_effects.count() == 0 );
    }

QRect EffectsHandler::transformWindowDamage( EffectWindow* w, const QRect& r )
    {
    if( current_transform < loaded_effects.size())
        {
        QRect rr = loaded_effects[current_transform++].second->transformWindowDamage( w, r );
        --current_transform;
        return rr;
        }
    else
        return r;
    }

Window EffectsHandler::createInputWindow( Effect* e, const QRect& r, const QCursor& cursor )
    {
    return createInputWindow( e, r.x(), r.y(), r.width(), r.height(), cursor );
    }

Window EffectsHandler::createFullScreenInputWindow( Effect* e, const QCursor& cursor )
    {
    return createInputWindow( e, 0, 0, displayWidth(), displayHeight(), cursor );
    }

CompositingType EffectsHandler::compositingType() const
    {
    return compositing_type;
    }

void EffectsHandler::sendReloadMessage( const QString& effectname )
    {
    QDBusMessage message = QDBusMessage::createMethodCall("org.kde.kwin", "/KWin", "org.kde.KWin", "reloadEffect");
    message << QString("kwin4_effect_" + effectname);
    QDBusConnection::sessionBus().send(message);
    }

KConfigGroup EffectsHandler::effectConfig( const QString& effectname )
    {
    KSharedConfig::Ptr kwinconfig = KSharedConfig::openConfig( "kwinrc", KConfig::NoGlobals );
    return kwinconfig->group( "Effect-" + effectname );
    }



EffectsHandler* effects = 0;


//****************************************
// EffectWindow
//****************************************

EffectWindow::EffectWindow()
    {
    }

EffectWindow::~EffectWindow()
    {
    }

bool EffectWindow::isOnCurrentDesktop() const
    {
    return isOnDesktop( effects->currentDesktop());
    }

bool EffectWindow::isOnDesktop( int d ) const
    {
    return desktop() == d || isOnAllDesktops();
    }

bool EffectWindow::hasDecoration() const
    {
    return contentsRect() != QRect( 0, 0, width(), height());
    }


//****************************************
// EffectWindowGroup
//****************************************

EffectWindowGroup::~EffectWindowGroup()
    {
    }

/***************************************************************
 WindowQuad
***************************************************************/

WindowQuad WindowQuad::makeSubQuad( float x1, float y1, float x2, float y2 ) const
    {
    assert( x1 < x2 && y1 < y2 && x1 >= left() && x2 <= right() && y1 >= top() && y2 <= bottom());
#ifndef NDEBUG
    if( isTransformed())
        kFatal( 1212 ) << "Splitting quads is allowed only in pre-paint calls!" << endl;
#endif
    WindowQuad ret( *this );
    // vertices are clockwise starting from topleft
    ret.verts[ 0 ].px = x1;
    ret.verts[ 3 ].px = x1;
    ret.verts[ 1 ].px = x2;
    ret.verts[ 2 ].px = x2;
    ret.verts[ 0 ].py = y1;
    ret.verts[ 1 ].py = y1;
    ret.verts[ 2 ].py = y2;
    ret.verts[ 3 ].py = y2;
    // original x/y are supposed to be the same, no transforming is done here
    ret.verts[ 0 ].ox = x1;
    ret.verts[ 3 ].ox = x1;
    ret.verts[ 1 ].ox = x2;
    ret.verts[ 2 ].ox = x2;
    ret.verts[ 0 ].oy = y1;
    ret.verts[ 1 ].oy = y1;
    ret.verts[ 2 ].oy = y2;
    ret.verts[ 3 ].oy = y2;
    float my_tleft = verts[ 0 ].tx;
    float my_tright = verts[ 2 ].tx;
    float my_ttop = verts[ 0 ].ty;
    float my_tbottom = verts[ 2 ].ty;
    float tleft = ( x1 - left()) / ( right() - left()) * ( my_tright - my_tleft ) + my_tleft;
    float tright = ( x2 - left()) / ( right() - left()) * ( my_tright - my_tleft ) + my_tleft;
    float ttop = ( y1 - top()) / ( bottom() - top()) * ( my_tbottom - my_ttop ) + my_ttop;
    float tbottom = ( y2 - top()) / ( bottom() - top()) * ( my_tbottom - my_ttop ) + my_ttop;
    ret.verts[ 0 ].tx = tleft;
    ret.verts[ 3 ].tx = tleft;
    ret.verts[ 1 ].tx = tright;
    ret.verts[ 2 ].tx = tright;
    ret.verts[ 0 ].ty = ttop;
    ret.verts[ 1 ].ty = ttop;
    ret.verts[ 2 ].ty = tbottom;
    ret.verts[ 3 ].ty = tbottom;
    return ret;
    }

bool WindowQuad::smoothNeeded() const
    {
    // smoothing is needed if the width or height of the quad does not match the original size
    float width = verts[ 1 ].ox - verts[ 0 ].ox;
    float height = verts[ 2 ].oy - verts[ 1 ].oy;
    return( verts[ 1 ].px - verts[ 0 ].px != width || verts[ 2 ].px - verts[ 3 ].px != width
        || verts[ 2 ].py - verts[ 1 ].py != height || verts[ 3 ].py - verts[ 0 ].py != height );
    }

/***************************************************************
 WindowQuadList
***************************************************************/

WindowQuadList WindowQuadList::splitAtX( float x ) const
    {
    WindowQuadList ret;
    foreach( WindowQuad quad, *this )
        {
#ifndef NDEBUG
        if( quad.isTransformed())
            kFatal( 1212 ) << "Splitting quads is allowed only in pre-paint calls!" << endl;
#endif
        bool wholeleft = true;
        bool wholeright = true;
        for( int i = 0;
             i < 4;
             ++i )
            {
            if( quad[ i ].x() < x )
                wholeright = false;
            if( quad[ i ].x() >= x )
                wholeleft = false;
            }
        if( wholeleft || wholeright ) // is whole in one split part
            {
            ret.append( quad );
            continue;
            }
        ret.append( quad.makeSubQuad( quad.left(), quad.top(), x, quad.bottom()));
        ret.append( quad.makeSubQuad( x, quad.top(), quad.right(), quad.bottom()));
        }
    return ret;
    }

WindowQuadList WindowQuadList::splitAtY( float y ) const
    {
    WindowQuadList ret;
    foreach( WindowQuad quad, *this )
        {
#ifndef NDEBUG
        if( quad.isTransformed())
            kFatal( 1212 ) << "Splitting quads is allowed only in pre-paint calls!" << endl;
#endif
        bool wholetop = true;
        bool wholebottom = true;
        for( int i = 0;
             i < 4;
             ++i )
            {
            if( quad[ i ].y() < y )
                wholebottom = false;
            if( quad[ i ].y() >= y )
                wholetop = false;
            }
        if( wholetop || wholebottom ) // is whole in one split part
            {
            ret.append( quad );
            continue;
            }
        ret.append( quad.makeSubQuad( quad.left(), quad.top(), quad.right(), y ));
        ret.append( quad.makeSubQuad( quad.left(), y, quad.right(), quad.bottom()));
        }
    return ret;
    }

WindowQuadList WindowQuadList::makeGrid( int maxquadsize ) const
    {
    if( empty())
        return *this;
    // find the bounding rectangle
    float left = first().left();
    float right = first().right();
    float top = first().top();
    float bottom = first().bottom();
    foreach( WindowQuad quad, *this )
        {
#ifndef NDEBUG
        if( quad.isTransformed())
            kFatal( 1212 ) << "Splitting quads is allowed only in pre-paint calls!" << endl;
#endif
        left = qMin( left, quad.left());
        right = qMax( right, quad.right());
        top = qMin( top, quad.top());
        bottom = qMax( bottom, quad.bottom());
        }
    WindowQuadList ret;
    for( float x = left;
         x < right;
         x += maxquadsize )
        {
        for( float y = top;
             y < bottom;
             y += maxquadsize )
            {
            foreach( WindowQuad quad, *this )
                {
                if( QRectF( QPointF( quad.left(), quad.top()), QPointF( quad.right(), quad.bottom()))
                    .intersects( QRectF( x, y, maxquadsize, maxquadsize )))
                    {
                    ret.append( quad.makeSubQuad( qMax( x, quad.left()), qMax( y, quad.top()),
                        qMin( quad.right(), x + maxquadsize ), qMin( quad.bottom(), y + maxquadsize )));
                    }
                }
            }
        }
    return ret;
    }

void WindowQuadList::makeArrays( float** vertices, float** texcoords ) const
    {
    *vertices = new float[ count() * 4 * 2 ];
    *texcoords = new float[ count() * 4 * 2 ];
    float* vpos = *vertices;
    float* tpos = *texcoords;
    for( int i = 0;
         i < count();
         ++i )
        for( int j = 0;
             j < 4;
             ++j )
            {
            *vpos++ = at( i )[ j ].x();
            *vpos++ = at( i )[ j ].y();
            *tpos++ = at( i )[ j ].tx;
            *tpos++ = at( i )[ j ].ty;
            }
    }

WindowQuadList WindowQuadList::select( WindowQuadType type ) const
    {
    foreach( WindowQuad q, *this )
        {
        if( q.type != type ) // something else than ones to select, make a copy and filter
            {
            WindowQuadList ret;
            foreach( WindowQuad q, *this )
                {
                if( q.type == type )
                    ret.append( q );
                }
            return ret;
            }
        }
    return *this; // nothing to filter out
    }

WindowQuadList WindowQuadList::filterOut( WindowQuadType type ) const
    {
    foreach( WindowQuad q, *this )
        {
        if( q.type == type ) // something to filter out, make a copy and filter
            {
            WindowQuadList ret;
            foreach( WindowQuad q, *this )
                {
                if( q.type != type )
                    ret.append( q );
                }
            return ret;
            }
        }
    return *this; // nothing to filter out
    }

bool WindowQuadList::smoothNeeded() const
    {
    foreach( WindowQuad q, *this )
        if( q.smoothNeeded())
            return true;
    return false;
    }

} // namespace