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Wait two seconds before deleting the scratch pixmap in the paint redirector

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in case we need it again.

This should improve performance with drivers where creating pixmaps is
expensive.

svn path=/trunk/KDE/kdebase/workspace/; revision=1104069
This commit is contained in:
Fredrik Höglund 2010-03-16 16:34:39 +00:00
parent c83c168c16
commit e969813b4a
2 changed files with 25 additions and 4 deletions
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25
paintredirector.cpp
View file

@ -27,6 +27,7 @@ DEALINGS IN THE SOFTWARE.
#include <kdebug.h>
#include <qevent.h>
#include <qpainter.h>
#include <qmath.h>
namespace KWin
{
@ -43,15 +44,22 @@ PaintRedirector::PaintRedirector( QWidget* w )
QPixmap PaintRedirector::performPendingPaint()
{
//qDebug() << "### performing paint, pending:" << pending.boundingRect();
QPixmap pixmap( pending.boundingRect().size());
pixmap.fill( Qt::transparent );
const QSize size = pending.boundingRect().size();
if ( scratch.width() < size.width() || scratch.height() < size.height() )
{
int w = qCeil( size.width() / 128. ) * 128;
int h = qCeil( size.height() / 128. ) * 128;
scratch = QPixmap( qMax( scratch.width(), w ), qMax( scratch.height(), h ) );
}
scratch.fill( Qt::transparent );
recursionCheck = true;
// do not use DrawWindowBackground, it's ok to be transparent
widget->render( &pixmap, QPoint(), pending.boundingRect(), QWidget::DrawChildren );
widget->render( &scratch, QPoint(), pending.boundingRect(), QWidget::DrawChildren );
recursionCheck = false;
pending = QRegion();
scheduled = QRegion();
return pixmap;
cleanupTimer.start(2000, this);
return scratch;
}
bool PaintRedirector::isToolTip( QWidget *object ) const
@ -128,6 +136,15 @@ void PaintRedirector::removed( QWidget* w )
w->installEventFilter( this );
}
void PaintRedirector::timerEvent( QTimerEvent* event )
{
if ( event->timerId() == cleanupTimer.timerId() )
{
cleanupTimer.stop();
scratch = QPixmap();
}
}
} // namespace
#include "paintredirector.moc"

4
paintredirector.h
View file

@ -28,6 +28,7 @@ DEALINGS IN THE SOFTWARE.
#include <qregion.h>
#include <qtimer.h>
#include <qwidget.h>
#include <qbasictimer.h>
namespace KWin
{
@ -50,11 +51,14 @@ class PaintRedirector
void added( QWidget* widget );
void removed( QWidget* widget );
bool isToolTip( QWidget* widget ) const;
void timerEvent( QTimerEvent* event );
QWidget* widget;
QRegion pending;
QRegion scheduled;
QPixmap scratch;
bool recursionCheck;
QTimer timer;
QBasicTimer cleanupTimer;
};
} // namespace