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kwin/clients/oxygen/oxygenshadowcache.cpp
Hugo Pereira Da Costa 488b3644d5 Changed handling of shadow overlap with window content 
Oxygen::ShadowCache::shadowSize() now returns the shadow extend outside of the window body (the extend)
Overlab between the actual shadow pixmap and the window body is dealt with internally (by creating larger pixmaps)
This allows notably Oxygen::Client to not attempt to draw shadow when shadowSize == 0 (which was never the case
before)
2011-02-02 17:23:08 +01:00

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//////////////////////////////////////////////////////////////////////////////
// oxygenshadowcache.cpp
// handles caching of TileSet objects to draw shadows
// -------------------
//
// Copyright (c) 2009 Hugo Pereira Da Costa <hugo.pereira@free.fr>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//////////////////////////////////////////////////////////////////////////////
#include "oxygenshadowcache.h"
#include <cassert>
#include <cmath>
#include <KColorUtils>
#include <QtGui/QPainter>
#include <QtCore/QTextStream>
namespace Oxygen
{
//_______________________________________________________
qreal sqr( qreal x )
{ return x*x; }
//_______________________________________________________
ShadowCache::ShadowCache( DecoHelper& helper ):
helper_( helper ),
activeShadowConfiguration_( ShadowConfiguration( QPalette::Active ) ),
inactiveShadowConfiguration_( ShadowConfiguration( QPalette::Inactive ) )
{
setEnabled( true );
setMaxIndex( 256 );
}
//_______________________________________________________
bool ShadowCache::shadowConfigurationChanged( const ShadowConfiguration& other ) const
{
const ShadowConfiguration& local = (other.colorGroup() == QPalette::Active ) ? activeShadowConfiguration_:inactiveShadowConfiguration_;
return !(local == other);
}
//_______________________________________________________
void ShadowCache::setShadowConfiguration( const ShadowConfiguration& other )
{
ShadowConfiguration& local = (other.colorGroup() == QPalette::Active ) ? activeShadowConfiguration_:inactiveShadowConfiguration_;
local = other;
}
//_______________________________________________________
TileSet* ShadowCache::tileSet( const Key& key )
{
// check if tileSet already in cache
int hash( key.hash() );
if( enabled_ && shadowCache_.contains(hash) ) return shadowCache_.object(hash);
// create tileSet otherwise
qreal size( shadowSize() + overlap );
TileSet* tileSet = new TileSet( shadowPixmap( key, key.active ), size, size, size, size, size, size, 1, 1);
shadowCache_.insert( hash, tileSet );
return tileSet;
}
//_______________________________________________________
TileSet* ShadowCache::tileSet( Key key, qreal opacity )
{
int index( opacity*maxIndex_ );
assert( index <= maxIndex_ );
// construct key
key.index = index;
// check if tileSet already in cache
int hash( key.hash() );
if( enabled_ && animatedShadowCache_.contains(hash) ) return animatedShadowCache_.object(hash);
// create shadow and tileset otherwise
qreal size( shadowSize() + overlap );
QPixmap shadow( size*2, size*2 );
shadow.fill( Qt::transparent );
QPainter p( &shadow );
p.setRenderHint( QPainter::Antialiasing );
QPixmap inactiveShadow( shadowPixmap( key, false ) );
{
QPainter pp( &inactiveShadow );
pp.setRenderHint( QPainter::Antialiasing );
pp.setCompositionMode(QPainter::CompositionMode_DestinationIn);
pp.fillRect( inactiveShadow.rect(), QColor( 0, 0, 0, 255*(1.0-opacity ) ) );
}
QPixmap activeShadow( shadowPixmap( key, true ) );
{
QPainter pp( &activeShadow );
pp.setRenderHint( QPainter::Antialiasing );
pp.setCompositionMode(QPainter::CompositionMode_DestinationIn);
pp.fillRect( activeShadow.rect(), QColor( 0, 0, 0, 255*( opacity ) ) );
}
p.drawPixmap( QPointF(0,0), inactiveShadow );
p.drawPixmap( QPointF(0,0), activeShadow );
p.end();
TileSet* tileSet = new TileSet(shadow, size, size, 1, 1);
animatedShadowCache_.insert( hash, tileSet );
return tileSet;
}
//_______________________________________________________
QPixmap ShadowCache::shadowPixmap( const Key& key, bool active ) const
{
// local reference to relevant shadow configuration
const ShadowConfiguration& shadowConfiguration(
active ? activeShadowConfiguration_:inactiveShadowConfiguration_ );
static const qreal fixedSize = 25.5;
qreal size( shadowSize() );
qreal shadowSize( shadowConfiguration.isEnabled() ? shadowConfiguration.shadowSize():0 );
if( !shadowSize ) return QPixmap();
// add overlap
size += overlap;
shadowSize += overlap;
QPixmap shadow = QPixmap( size*2, size*2 );
shadow.fill( Qt::transparent );
QPainter p( &shadow );
p.setRenderHint( QPainter::Antialiasing );
p.setPen( Qt::NoPen );
// some gradients rendering are different at bottom corners if client has no border
bool hasBorder( key.hasBorder || key.isShade );
if( active )
{
{
// inner (sharp) gradient
const qreal gradientSize = qMin( shadowSize, (shadowSize+fixedSize)/2 );
const qreal hoffset = shadowConfiguration.horizontalOffset()*gradientSize/fixedSize;
const qreal voffset = shadowConfiguration.verticalOffset()*gradientSize/fixedSize;
QRadialGradient rg = QRadialGradient( size+12.0*hoffset, size+12.0*voffset, gradientSize );
rg.setColorAt(1, Qt::transparent );
// gaussian shadow is used
int nPoints( (10*gradientSize)/fixedSize );
Gaussian f( 0.85, 0.17 );
QColor c = shadowConfiguration.innerColor();
for( int i = 0; i < nPoints; i++ )
{
qreal x = qreal(i)/nPoints;
c.setAlphaF( f(x) );
rg.setColorAt( x, c );
}
p.setBrush( rg );
renderGradient( p, shadow.rect(), rg, hasBorder );
}
{
// outer (spread) gradient
const qreal gradientSize = shadowSize;
const qreal hoffset = shadowConfiguration.horizontalOffset()*gradientSize/fixedSize;
const qreal voffset = shadowConfiguration.verticalOffset()*gradientSize/fixedSize;
QRadialGradient rg = QRadialGradient( size+12.0*hoffset, size+12.0*voffset, gradientSize );
rg.setColorAt(1, Qt::transparent );
// gaussian shadow is used
int nPoints( (10*gradientSize)/fixedSize );
Gaussian f( 0.46, 0.34 );
QColor c = shadowConfiguration.outerColor();
for( int i = 0; i < nPoints; i++ )
{
qreal x = qreal(i)/nPoints;
c.setAlphaF( f(x) );
rg.setColorAt( x, c );
}
p.setBrush( rg );
p.drawRect( shadow.rect() );
}
} else {
{
// inner (sharp gradient)
const qreal gradientSize = qMin( shadowSize, fixedSize );
const qreal hoffset = shadowConfiguration.horizontalOffset()*gradientSize/fixedSize;
const qreal voffset = shadowConfiguration.verticalOffset()*gradientSize/fixedSize;
QRadialGradient rg = QRadialGradient( size+hoffset, size+voffset, gradientSize );
rg.setColorAt(1, Qt::transparent );
// parabolic shadow is used
int nPoints( (10*gradientSize)/fixedSize );
Parabolic f( 1.0, 0.22 );
QColor c = shadowConfiguration.outerColor();
for( int i = 0; i < nPoints; i++ )
{
qreal x = qreal(i)/nPoints;
c.setAlphaF( f(x) );
rg.setColorAt( x, c );
}
p.setBrush( rg );
renderGradient( p, shadow.rect(), rg, hasBorder );
}
{
// mid gradient
const qreal gradientSize = qMin( shadowSize, (shadowSize+2*fixedSize)/3 );
const qreal hoffset = shadowConfiguration.horizontalOffset()*gradientSize/fixedSize;
const qreal voffset = shadowConfiguration.verticalOffset()*gradientSize/fixedSize;
// gaussian shadow is used
QRadialGradient rg = QRadialGradient( size+8.0*hoffset, size+8.0*voffset, gradientSize );
rg.setColorAt(1, Qt::transparent );
int nPoints( (10*gradientSize)/fixedSize );
Gaussian f( 0.54, 0.21);
QColor c = shadowConfiguration.outerColor();
for( int i = 0; i < nPoints; i++ )
{
qreal x = qreal(i)/nPoints;
c.setAlphaF( f(x) );
rg.setColorAt( x, c );
}
p.setBrush( rg );
p.drawRect( shadow.rect() );
}
{
// outer (spread) gradient
const qreal gradientSize = shadowSize;
const qreal hoffset = shadowConfiguration.horizontalOffset()*gradientSize/fixedSize;
const qreal voffset = shadowConfiguration.verticalOffset()*gradientSize/fixedSize;
// gaussian shadow is used
QRadialGradient rg = QRadialGradient( size+20.0*hoffset, size+20.0*voffset, gradientSize );
rg.setColorAt(1, Qt::transparent );
int nPoints( (20*gradientSize)/fixedSize );
Gaussian f( 0.155, 0.445);
QColor c = shadowConfiguration.outerColor();
for( int i = 0; i < nPoints; i++ )
{
qreal x = qreal(i)/nPoints;
c.setAlphaF( f(x) );
rg.setColorAt( x, c );
}
p.setBrush( rg );
p.drawRect( shadow.rect() );
}
}
// mask
p.setCompositionMode(QPainter::CompositionMode_DestinationOut);
p.setBrush( Qt::black );
p.drawEllipse( QRectF( size-3, size-3, 6, 6 ) );
p.end();
return shadow;
}
//_______________________________________________________
void ShadowCache::renderGradient( QPainter& p, const QRectF& rect, const QRadialGradient& rg, bool hasBorder ) const
{
if( hasBorder )
{
p.setBrush( rg );
p.drawRect( rect );
return;
}
qreal size( rect.width()/2.0 );
qreal hoffset( rg.center().x() - size );
qreal voffset( rg.center().y() - size );
// load gradient stops
QGradientStops stops( rg.stops() );
qreal radius( rg.radius() );
// draw ellipse for the upper rect
{
QRectF rect( hoffset, voffset, 2*size-hoffset, size );
p.setBrush( rg );
p.drawRect( rect );
}
// draw square gradients for the lower rect
{
// vertical lines
QRectF rect( hoffset, size+voffset, 2*size-hoffset, 4 );
QLinearGradient lg( hoffset, 0.0, 2*size+hoffset, 0.0 );
for( int i = 0; i<stops.size(); i++ )
{
QColor c( stops[i].second );
qreal xx( stops[i].first*radius );
lg.setColorAt( (size-xx)/(2.0*size), c );
lg.setColorAt( (size+xx)/(2.0*size), c );
}
p.setBrush( lg );
p.drawRect( rect );
}
{
// horizontal line
QRectF rect( size-4+hoffset, size+voffset, 8, size );
QLinearGradient lg = QLinearGradient( 0, voffset, 0, 2*size+voffset );
for( int i = 0; i<stops.size(); i++ )
{
QColor c( stops[i].second );
qreal xx( stops[i].first*radius );
lg.setColorAt( (size+xx)/(2.0*size), c );
}
p.setBrush( lg );
p.drawRect( rect );
}
{
// bottom-left corner
QRectF rect( hoffset, size+4+voffset, size-4, size );
QRadialGradient rg = QRadialGradient( size+hoffset-4, size+4+voffset, radius );
for( int i = 0; i<stops.size(); i++ )
{
QColor c( stops[i].second );
qreal xx( stops[i].first -4.0/rg.radius() );
if( xx<0 )
{
if( i < stops.size()-1 )
{
qreal x1( stops[i+1].first -4.0/rg.radius() );
c = KColorUtils::mix( c, stops[i+1].second, -xx/(x1-xx) );
}
xx = 0;
}
rg.setColorAt( xx, c );
}
p.setBrush( rg );
p.drawRect( rect );
}
{
// bottom-right corner
QRectF rect( size+4+hoffset, size+4+voffset, size-4, size );
QRadialGradient rg = QRadialGradient( size+hoffset+4, size+4+voffset, radius );
for( int i = 0; i<stops.size(); i++ )
{
QColor c( stops[i].second );
qreal xx( stops[i].first -4.0/rg.radius() );
if( xx<0 )
{
if( i < stops.size()-1 )
{
qreal x1( stops[i+1].first -4.0/rg.radius() );
c = KColorUtils::mix( c, stops[i+1].second, -xx/(x1-xx) );
}
xx = 0;
}
rg.setColorAt( xx, c );
}
p.setBrush( rg );
p.drawRect( rect );
}
}
}
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