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