87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
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/*****************************************************************
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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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#ifdef HAVE_OPENGL
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#include <GL/gl.h>
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#endif
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namespace KWinInternal
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{
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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 |= Scene::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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drawShadow( w, mask, region, data.opacity );
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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, double opacity )
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{
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if(( mask & Scene::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 * opacity ); // black
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QRect r( w->geometry());
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r.moveBy( shadowXOffset, shadowYOffset );
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glEnableClientState( GL_VERTEX_ARRAY );
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int verts[ 4 * 2 ] =
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{
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r.x(), r.y(),
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r.x(), r.y() + r.height(),
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r.x() + r.width(), r.y() + r.height(),
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r.x() + r.width(), r.y()
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};
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glVertexPointer( 2, GL_INT, 0, verts );
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if( mask & ( Scene::PAINT_WINDOW_TRANSFORMED | Scene::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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glPopAttrib();
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}
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} // namespace
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