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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 "oxygenactiveshadowconfiguration.h"
#include "oxygeninactiveshadowconfiguration.h"
#include <cmath>
#include <KColorUtils>
#include <QPainter>
#include <QTextStream>
namespace Oxygen
{
//* square utility function
static qreal square( qreal x )
{ return x*x; }
//* functions used to draw shadows
class Parabolic
{
public:
//* constructor
Parabolic( qreal amplitude, qreal width ):
amplitude_( amplitude ),
width_( width )
{}
//* destructor
virtual ~Parabolic( void )
{}
//* value
virtual qreal operator() ( qreal x ) const
{ return qMax( 0.0, amplitude_*(1.0 - square(x/width_) ) ); }
private:
qreal amplitude_;
qreal width_;
};
//* functions used to draw shadows
class Gaussian
{
public:
//* constructor
Gaussian( qreal amplitude, qreal width ):
amplitude_( amplitude ),
width_( width )
{}
//* destructor
virtual ~Gaussian( void )
{}
//* value
virtual qreal operator() ( qreal x ) const
{ return qMax( 0.0, amplitude_*(std::exp( -square(x/width_) -0.05 ) ) ); }
private:
qreal amplitude_;
qreal width_;
};
//_______________________________________________________
ShadowCache::ShadowCache( Helper& helper ):
_helper( helper ),
_enabled( true ),
_activeShadowSize( 40 ),
_inactiveShadowSize( 40 )
{
setMaxIndex( 256 );
}
//_______________________________________________________
void ShadowCache::readConfig( void )
{
if( !_enabled ) setEnabled( true );
// shadows
#if OXYGEN_USE_KDE4
ActiveShadowConfiguration::self()->readConfig();
InactiveShadowConfiguration::self()->readConfig();
#else
ActiveShadowConfiguration::self()->load();
InactiveShadowConfiguration::self()->load();
#endif
// copy sizes to local
_activeShadowSize = ActiveShadowConfiguration::shadowSize();
_inactiveShadowSize = InactiveShadowConfiguration::shadowSize();
// invalidate caches
invalidateCaches();
}
//_______________________________________________________
void ShadowCache::setAnimationsDuration( int value )
{
setMaxIndex( qMin( 256, int( (120*value)/1000 ) ) );
invalidateCaches();
}
//_______________________________________________________
bool ShadowCache::isEnabled( QPalette::ColorGroup group ) const
{
if( group == QPalette::Active ) return ActiveShadowConfiguration::enabled();
else if( group == QPalette::Inactive ) return InactiveShadowConfiguration::enabled();
else return false;
}
//_______________________________________________________
void ShadowCache::setShadowSize( QPalette::ColorGroup group, int size )
{
if( group == QPalette::Active && _activeShadowSize != size )
{
_activeShadowSize = size;
invalidateCaches();
} else if( group == QPalette::Inactive && _inactiveShadowSize != size ) {
_inactiveShadowSize = size;
invalidateCaches();
}
}
//_______________________________________________________
int ShadowCache::shadowSize( void ) const
{
int activeSize( ActiveShadowConfiguration::enabled() ? _activeShadowSize:0 );
int inactiveSize( InactiveShadowConfiguration::enabled() ? _inactiveShadowSize:0 );
// even if shadows are disabled,
return qMax( activeSize, inactiveSize );
}
//_______________________________________________________
TileSet ShadowCache::tileSet( const Key& key )
{
// check if tileSet already in cache
int hash( key.hash() );
if( _enabled )
{
if( TileSet* cachedTileSet = _shadowCache.object( hash ) )
{ return *cachedTileSet; }
}
// create tileSet otherwise
const qreal size( shadowSize() + overlap );
TileSet tileSet( pixmap( key ), size, size, size, size, size, size, 1, 1);
_shadowCache.insert( hash, new TileSet( tileSet ) );
return tileSet;
}
//_______________________________________________________
TileSet ShadowCache::tileSet( Key key, qreal opacity )
{
int index( opacity*_maxIndex );
Q_ASSERT( index <= _maxIndex );
// construct key
key.index = index;
// check if tileSet already in cache
int hash( key.hash() );
if( _enabled )
{
if( TileSet* cachedTileSet = _animatedShadowCache.object(hash) )
{ return *cachedTileSet; }
}
// create shadow and tileset otherwise
const qreal size( shadowSize() + overlap );
TileSet tileSet( animatedPixmap( key, opacity ), size, size, 1, 1);
_animatedShadowCache.insert( hash, new TileSet( tileSet ) );
return tileSet;
}
//_______________________________________________________
QPixmap ShadowCache::animatedPixmap( const Key& key, qreal opacity )
{
// create shadow and tileset otherwise
const qreal size( shadowSize() + overlap );
QPixmap shadow( _helper.highDpiPixmap( size*2 ) );
shadow.fill( Qt::transparent );
QPainter painter( &shadow );
painter.setRenderHint( QPainter::Antialiasing );
QPixmap inactiveShadow( pixmap( key, false ) );
if( !inactiveShadow.isNull() )
{
QPainter local( &inactiveShadow );
local.setRenderHint( QPainter::Antialiasing );
local.setCompositionMode(QPainter::CompositionMode_DestinationIn);
local.fillRect( inactiveShadow.rect(), QColor( 0, 0, 0, 255*(1.0-opacity ) ) );
}
QPixmap activeShadow( pixmap( key, true ) );
if( !activeShadow.isNull() )
{
QPainter local( &activeShadow );
local.setRenderHint( QPainter::Antialiasing );
local.setCompositionMode(QPainter::CompositionMode_DestinationIn);
local.fillRect( activeShadow.rect(), QColor( 0, 0, 0, 255*( opacity ) ) );
}
painter.drawPixmap( QPointF(0,0), inactiveShadow );
painter.drawPixmap( QPointF(0,0), activeShadow );
painter.end();
return shadow;
}
//_______________________________________________________
QPixmap ShadowCache::pixmap( const Key& key, bool active ) const
{
static const qreal fixedSize = 25.5;
qreal size( shadowSize() );
qreal shadowSize( 0 );
if( active && ActiveShadowConfiguration::enabled() ) shadowSize = _activeShadowSize;
else if( !active && InactiveShadowConfiguration::enabled() ) shadowSize = _inactiveShadowSize;
if( !shadowSize ) return QPixmap();
// add overlap
size += overlap;
shadowSize += overlap;
QPixmap shadow( _helper.highDpiPixmap( size*2 ) );
shadow.fill( Qt::transparent );
QPainter painter( &shadow );
painter.setRenderHint( QPainter::Antialiasing );
painter.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 voffset = qMin( 12.0*(gradientSize*ActiveShadowConfiguration::verticalOffset())/fixedSize, 4.0 );
QRadialGradient radialGradient = QRadialGradient( size, size + voffset, gradientSize );
radialGradient.setColorAt(1, Qt::transparent );
// gaussian shadow is used
int nPoints( (10*gradientSize)/fixedSize );
Gaussian f( 0.85, 0.17 );
QColor c = ActiveShadowConfiguration::innerColor();
for( int i = 0; i < nPoints; i++ )
{
qreal x = qreal(i)/nPoints;
c.setAlphaF( f(x) );
radialGradient.setColorAt( x, c );
}
painter.setBrush( radialGradient );
renderGradient( painter, shadow.rect(), radialGradient, hasBorder );
}
{
// outer (spread) gradient
const qreal gradientSize = shadowSize;
const qreal voffset = qMin( 12.0*(gradientSize*ActiveShadowConfiguration::verticalOffset())/fixedSize, 4.0 );
QRadialGradient radialGradient = QRadialGradient( size, size+voffset, gradientSize );
radialGradient.setColorAt(1, Qt::transparent );
// gaussian shadow is used
int nPoints( (10*gradientSize)/fixedSize );
Gaussian f( 0.46, 0.34 );
QColor c = ActiveShadowConfiguration::useOuterColor() ? ActiveShadowConfiguration::outerColor():ActiveShadowConfiguration::innerColor();
for( int i = 0; i < nPoints; i++ )
{
qreal x = qreal(i)/nPoints;
c.setAlphaF( f(x) );
radialGradient.setColorAt( x, c );
}
painter.setBrush( radialGradient );
painter.drawRect( shadow.rect() );
}
} else {
{
// inner (sharp gradient)
const qreal gradientSize = qMin( shadowSize, fixedSize );
const qreal voffset( 0.2 );
QRadialGradient radialGradient = QRadialGradient( size, size+voffset, gradientSize );
radialGradient.setColorAt(1, Qt::transparent );
// parabolic shadow is used
int nPoints( (10*gradientSize)/fixedSize );
Parabolic f( 1.0, 0.22 );
QColor c = InactiveShadowConfiguration::useOuterColor() ? InactiveShadowConfiguration::outerColor():InactiveShadowConfiguration::innerColor();
for( int i = 0; i < nPoints; i++ )
{
qreal x = qreal(i)/nPoints;
c.setAlphaF( f(x) );
radialGradient.setColorAt( x, c );
}
painter.setBrush( radialGradient );
renderGradient( painter, shadow.rect(), radialGradient, hasBorder );
}
{
// mid gradient
const qreal gradientSize = qMin( shadowSize, (shadowSize+2*fixedSize)/3 );
const qreal voffset = qMin( 8.0*(gradientSize*InactiveShadowConfiguration::verticalOffset())/fixedSize, 4.0 );
// gaussian shadow is used
QRadialGradient radialGradient = QRadialGradient( size, size+voffset, gradientSize );
radialGradient.setColorAt(1, Qt::transparent );
int nPoints( (10*gradientSize)/fixedSize );
Gaussian f( 0.54, 0.21);
QColor c = InactiveShadowConfiguration::useOuterColor() ? InactiveShadowConfiguration::outerColor():InactiveShadowConfiguration::innerColor();
for( int i = 0; i < nPoints; i++ )
{
qreal x = qreal(i)/nPoints;
c.setAlphaF( f(x) );
radialGradient.setColorAt( x, c );
}
painter.setBrush( radialGradient );
painter.drawRect( shadow.rect() );
}
{
// outer (spread) gradient
const qreal gradientSize = shadowSize;
const qreal voffset = qMin( 20.0*(gradientSize*InactiveShadowConfiguration::verticalOffset())/fixedSize, 4.0 );
// gaussian shadow is used
QRadialGradient radialGradient = QRadialGradient( size, size+voffset, gradientSize );
radialGradient.setColorAt(1, Qt::transparent );
int nPoints( (20*gradientSize)/fixedSize );
Gaussian f( 0.155, 0.445);
QColor c = InactiveShadowConfiguration::useOuterColor() ? InactiveShadowConfiguration::outerColor():InactiveShadowConfiguration::innerColor();
for( int i = 0; i < nPoints; i++ )
{
qreal x = qreal(i)/nPoints;
c.setAlphaF( f(x) );
radialGradient.setColorAt( x, c );
}
painter.setBrush( radialGradient );
painter.drawRect( shadow.rect() );
}
}
// mask
painter.setCompositionMode(QPainter::CompositionMode_DestinationOut);
painter.setBrush( Qt::black );
painter.drawEllipse( QRectF( size-3, size-3, 6, 6 ) );
painter.end();
return shadow;
}
//_______________________________________________________
void ShadowCache::renderGradient( QPainter& painter, const QRectF& rect, const QRadialGradient& radialGradient, bool hasBorder ) const
{
if( hasBorder )
{
painter.setBrush( radialGradient );
painter.drawRect( rect );
return;
}
const qreal size( rect.width()/2.0 );
const qreal hoffset( radialGradient.center().x() - size );
const qreal voffset( radialGradient.center().y() - size );
const qreal radius( radialGradient.radius() );
// load gradient stops
QGradientStops stops( radialGradient.stops() );
// draw ellipse for the upper rect
{
QRectF rect( hoffset, voffset, 2*size-hoffset, size );
painter.setBrush( radialGradient );
painter.drawRect( rect );
}
// draw square gradients for the lower rect
{
// vertical lines
const 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++ )
{
const QColor c( stops[i].second );
const qreal xx( stops[i].first*radius );
lg.setColorAt( (size-xx)/(2.0*size), c );
lg.setColorAt( (size+xx)/(2.0*size), c );
}
painter.setBrush( lg );
painter.drawRect( rect );
}
{
// horizontal line
const 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++ )
{
const QColor c( stops[i].second );
const qreal xx( stops[i].first*radius );
lg.setColorAt( (size+xx)/(2.0*size), c );
}
painter.setBrush( lg );
painter.drawRect( rect );
}
{
// bottom-left corner
const QRectF rect( hoffset, size+voffset+4, size-4, size );
QRadialGradient radialGradient = QRadialGradient( size+hoffset-4, size+voffset+4, radius );
for( int i = 0; i<stops.size(); i++ )
{
QColor c( stops[i].second );
qreal xx( stops[i].first -4.0/radius );
if( xx<0 )
{
if( i < stops.size()-1 )
{
const qreal x1( stops[i+1].first -4.0/radius );
c = KColorUtils::mix( c, stops[i+1].second, -xx/(x1-xx) );
}
xx = 0;
}
radialGradient.setColorAt( xx, c );
}
painter.setBrush( radialGradient );
painter.drawRect( rect );
}
{
// bottom-right corner
const QRectF rect( size+hoffset+4, size+voffset+4, size-4, size );
QRadialGradient radialGradient = QRadialGradient( size+hoffset+4, size+voffset+4, radius );
for( int i = 0; i<stops.size(); i++ )
{
QColor c( stops[i].second );
qreal xx( stops[i].first -4.0/radius );
if( xx<0 )
{
if( i < stops.size()-1 )
{
const qreal x1( stops[i+1].first -4.0/radius );
c = KColorUtils::mix( c, stops[i+1].second, -xx/(x1-xx) );
}
xx = 0;
}
radialGradient.setColorAt( xx, c );
}
painter.setBrush( radialGradient );
painter.drawRect( rect );
}
}
}
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