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kwin/clients/oxygen/oxygenshadowcache.cpp
Hugo Pereira Da Costa 99a0cddd77 Reduce cache size and truncate opacity settings for shadow focus transition, based on the 
animation durations. For default duration (200msec), this reduces the size of the cache by about a 
factor 10, and still corresponds to a 120Hz frame rate.

BUG: 234187




svn path=/trunk/KDE/kdebase/workspace/; revision=1114935
2010-04-14 22:21:08 +00:00

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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 "oxygenclient.h"
#include "oxygen.h"
#include "oxygenhelper.h"
#include <cassert>
#include <KColorUtils>
#include <QtGui/QPainter>
#include <QtCore/QTextStream>
namespace Oxygen
{
//_______________________________________________________
OxygenShadowCache::OxygenShadowCache( OxygenDecoHelper& helper ):
helper_( helper ),
activeShadowConfiguration_( OxygenShadowConfiguration( QPalette::Active ) ),
inactiveShadowConfiguration_( OxygenShadowConfiguration( QPalette::Inactive ) )
{
setEnabled( true );
setMaxIndex( 256 );
}
//_______________________________________________________
bool OxygenShadowCache::shadowConfigurationChanged( const OxygenShadowConfiguration& other ) const
{
const OxygenShadowConfiguration& local = (other.colorGroup() == QPalette::Active ) ? activeShadowConfiguration_:inactiveShadowConfiguration_;
return !(local == other);
}
//_______________________________________________________
void OxygenShadowCache::setShadowConfiguration( const OxygenShadowConfiguration& other )
{
OxygenShadowConfiguration& local = (other.colorGroup() == QPalette::Active ) ? activeShadowConfiguration_:inactiveShadowConfiguration_;
local = other;
}
//_______________________________________________________
TileSet* OxygenShadowCache::tileSet( const OxygenClient* client )
{
// construct key
Key key( client );
// check if tileset already in cache
int hash( key.hash() );
if( shadowCache_.contains(hash) ) return shadowCache_.object(hash);
// create tileset otherwise
qreal size( shadowSize() );
TileSet* tileSet = new TileSet( shadowPixmap( client, key.active ), size, size, 1, 1);
shadowCache_.insert( hash, tileSet );
return tileSet;
}
//_______________________________________________________
TileSet* OxygenShadowCache::tileSet( const OxygenClient* client, qreal opacity )
{
int index( opacity*maxIndex_ );
assert( index <= maxIndex_ );
// construct key
Key key( client );
key.index = index;
// check if tileset already in cache
int hash( key.hash() );
if( animatedShadowCache_.contains(hash) ) return animatedShadowCache_.object(hash);
// create shadow and tileset otherwise
qreal size( shadowSize() );
QPixmap shadow( size*2, size*2 );
shadow.fill( Qt::transparent );
QPainter p( &shadow );
p.setRenderHint( QPainter::Antialiasing );
QPixmap inactiveShadow( shadowPixmap( client, 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( client, 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 OxygenShadowCache::shadowPixmap(const OxygenClient* client, bool active ) const
{
// get window color
Key key( client );
QPalette palette( client->backgroundPalette( client->widget(), client->widget()->palette() ) );
QColor color( palette.color( client->widget()->backgroundRole() ) );
return simpleShadowPixmap( color, key, active );
}
//_______________________________________________________
QPixmap OxygenShadowCache::simpleShadowPixmap( const QColor& color, const Key& key, bool active ) const
{
// local reference to relevant shadow configuration
const OxygenShadowConfiguration& shadowConfiguration(
active && key.useOxygenShadows ?
activeShadowConfiguration_:inactiveShadowConfiguration_ );
static const qreal fixedSize = 25.5;
qreal size( shadowSize() );
qreal shadowSize( shadowConfiguration.isEnabled() ? shadowConfiguration.shadowSize():0 );
QPixmap shadow = QPixmap( size*2, size*2 );
shadow.fill( Qt::transparent );
QPainter p( &shadow );
p.setRenderHint( QPainter::Antialiasing );
p.setPen( Qt::NoPen );
// offsets are scaled with the shadow size
// so that the ratio Top-shadow/Bottom-shadow is kept constant
// when shadow size is changed
qreal hoffset = shadowConfiguration.horizontalOffset()*shadowSize/fixedSize;
qreal voffset = shadowConfiguration.verticalOffset()*shadowSize/fixedSize;
// some gradients rendering are different at bottom corners if client has no border
bool hasBorder( key.hasBorder || key.isShade );
if( shadowSize )
{
if( active && key.useOxygenShadows )
{
{
// inner (shark) gradient
int nPoints = 7;
qreal x[7] = {0, 0.05, 0.1, 0.15, 0.2, 0.3, 0.4 };
int values[7] = {203, 200, 175, 105, 45, 2, 0 };
QRadialGradient rg = QRadialGradient( size+12.0*hoffset, size+12.0*voffset, shadowSize );
QColor c = shadowConfiguration.innerColor();
for( int i = 0; i<nPoints; i++ )
{ c.setAlpha( values[i] ); rg.setColorAt( x[i], c ); }
p.setBrush( rg );
renderGradient( p, shadow.rect(), rg, hasBorder );
}
if( true ) {
// outer (spread) gradient
int nPoints = 7;
qreal x[7] = {0, 0.15, 0.3, 0.45, 0.65, 0.75, 1 };
int values[7] = {120, 95, 50, 20, 10, 5, 0 };
QRadialGradient rg = QRadialGradient( size+12.0*hoffset, size+12.0*voffset, shadowSize );
QColor c = shadowConfiguration.outerColor();
for( int i = 0; i<nPoints; i++ )
{ c.setAlpha( values[i] ); rg.setColorAt( x[i], c ); }
p.setBrush( rg );
p.drawRect( shadow.rect() );
}
} else {
{
// inner (sharp gradient)
int nPoints = 5;
qreal values[5] = { 1, 0.32, 0.22, 0.03, 0 };
qreal x[5] = { 0, 4.5, 5.0, 5.5, 6.5 };
QRadialGradient rg = QRadialGradient( size+hoffset, size+voffset, shadowSize );
QColor c = shadowConfiguration.innerColor();
for( int i = 0; i<nPoints; i++ )
{ c.setAlphaF( values[i] ); rg.setColorAt( x[i]/fixedSize, c ); }
renderGradient( p, shadow.rect(), rg, hasBorder );
}
{
// mid gradient
int nPoints = 7;
qreal values[7] = {0.55, 0.25, 0.20, 0.1, 0.06, 0.015, 0 };
qreal x[7] = {0, 4.5, 5.5, 7.5, 8.5, 11.5, 14.5 };
QRadialGradient rg = QRadialGradient( size+10.0*hoffset, size+10.0*voffset, shadowSize );
QColor c = shadowConfiguration.midColor();
for( int i = 0; i<nPoints; i++ )
{ c.setAlphaF( values[i] ); rg.setColorAt( x[i]/fixedSize, c ); }
p.setBrush( rg );
p.drawRect( shadow.rect() );
}
{
// outer (spread) gradient
int nPoints = 9;
qreal values[9] = { 0.17, 0.12, 0.11, 0.075, 0.06, 0.035, 0.025, 0.01, 0 };
qreal x[9] = {0, 4.5, 6.6, 8.5, 11.5, 14.5, 17.5, 21.5, 25.5 };
QRadialGradient rg = QRadialGradient( size+20.0*hoffset, size+20.0*voffset, shadowSize );
QColor c = shadowConfiguration.outerColor();
for( int i = 0; i<nPoints; i++ )
{ c.setAlphaF( values[i] ); rg.setColorAt( x[i]/fixedSize, c ); }
p.setBrush( rg );
p.drawRect( shadow.rect() );
}
}
}
// draw the corner of the window - actually all 4 corners as one circle
// this is all fixedSize. Does not scale with shadow size
QLinearGradient lg = QLinearGradient(0.0, size-4.5, 0.0, size+4.5);
lg.setColorAt(0.0, helper().calcLightColor( helper().backgroundTopColor(color) ));
lg.setColorAt(0.51, helper().backgroundBottomColor(color) );
lg.setColorAt(1.0, helper().backgroundBottomColor(color) );
// draw ellipse.
p.setBrush( lg );
p.drawEllipse( QRectF( size-4, size-4, 8, 8 ) );
p.end();
return shadow;
}
//_______________________________________________________
void OxygenShadowCache::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 );
}
}
OxygenShadowCache::Key::Key( const OxygenClient* client):
index(0)
{
active = client->isActive() || client->isForcedActive();
useOxygenShadows = client->configuration().useOxygenShadows();
isShade = client->isShade();
hasTitleOutline = client->configuration().drawTitleOutline();
hasBorder = ( client->configuration().frameBorder() > OxygenConfiguration::BorderNone );
}
}
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