94 lines
2.9 KiB
C++
94 lines
2.9 KiB
C++
/*****************************************************************
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KWin - the KDE window manager
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This file is part of the KDE project.
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Copyright (C) 2007 Lubos Lunak <l.lunak@kde.org>
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You can Freely distribute this program under the GNU General Public
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License. See the file "COPYING" for the exact licensing terms.
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******************************************************************/
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#include "shadow.h"
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#include <kwinglutils.h>
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namespace KWin
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{
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KWIN_EFFECT( Shadow, ShadowEffect )
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ShadowEffect::ShadowEffect()
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: shadowXOffset( 10 )
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, shadowYOffset( 10 )
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{
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}
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void ShadowEffect::prePaintWindow( EffectWindow* w, int* mask, QRegion* paint, QRegion* clip, int time )
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{
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*mask |= PAINT_WINDOW_TRANSLUCENT;
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*paint |= ( QRegion( w->geometry()) & *paint ).translated( shadowXOffset, shadowYOffset );
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effects->prePaintWindow( w, mask, paint, clip, time );
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}
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void ShadowEffect::paintWindow( EffectWindow* w, int mask, QRegion region, WindowPaintData& data )
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{
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if( !w->isDeleted() )
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drawShadow( w, mask, region, data );
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effects->paintWindow( w, mask, region, data );
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}
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void ShadowEffect::postPaintWindow( EffectWindow* w )
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{
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effects->postPaintWindow( w );
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}
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QRect ShadowEffect::transformWindowDamage( EffectWindow* w, const QRect& r )
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{
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QRect r2 = r | r.translated( shadowXOffset, shadowYOffset );
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return effects->transformWindowDamage( w, r2 );
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}
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void ShadowEffect::drawShadow( EffectWindow* w, int mask, QRegion region, WindowPaintData& data )
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{
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if(( mask & PAINT_WINDOW_TRANSLUCENT ) == 0 )
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return;
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glPushAttrib( GL_CURRENT_BIT | GL_ENABLE_BIT );
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glEnable( GL_BLEND );
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glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
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glColor4f( 0, 0, 0, 0.2 * data.opacity ); // black
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glPushMatrix();
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if( mask & PAINT_WINDOW_TRANSFORMED )
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glTranslatef( data.xTranslate, data.yTranslate, 0 );
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glTranslatef( w->x() + shadowXOffset, w->y() + shadowYOffset, 0 );
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if(( mask & PAINT_WINDOW_TRANSFORMED ) && ( data.xScale != 1 || data.yScale != 1 ))
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glScalef( data.xScale, data.yScale, 1 );
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glEnableClientState( GL_VERTEX_ARRAY );
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int verts[ 4 * 2 ] =
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{
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0, 0,
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0, w->height(),
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w->width(), w->height(),
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w->width(), 0
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};
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glVertexPointer( 2, GL_INT, 0, verts );
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if( mask & ( PAINT_WINDOW_TRANSFORMED | PAINT_SCREEN_TRANSFORMED ))
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glDrawArrays( GL_QUADS, 0, 4 );
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else
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{ // clip by region
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glEnable( GL_SCISSOR_TEST );
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int dh = displayHeight();
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foreach( QRect r, region.rects())
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{
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// Scissor rect has to be given in OpenGL coords
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glScissor(r.x(), dh - r.y() - r.height(), r.width(), r.height());
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glDrawArrays( GL_QUADS, 0, 4 );
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}
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}
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glDisableClientState( GL_VERTEX_ARRAY );
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glPopMatrix();
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glPopAttrib();
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}
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} // namespace
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