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Speed up patches backported from
http://robotics.dei.unipd.it/~koral/KDE/kflicker.html
and
http://lists.kde.org/?l=kde-optimize&m=105382164111363&w=2 (complete thread)
diff -u qt-2.3.7_old/src/iconview/qiconview.cpp qt-2.3.7/src/iconview/qiconview.cpp
--- qt-2.3.7_old/src/iconview/qiconview.cpp 2004-06-13 22:29:56.000000000 +0200
+++ qt-2.3.7/src/iconview/qiconview.cpp 2004-06-13 22:33:32.000000000 +0200
@@ -1,5 +1,5 @@
/****************************************************************************
-** $Id$
+** $Id$
**
** Implementation of QIconView widget class
**
@@ -220,6 +220,7 @@
QIconView::SelectionMode selectionMode;
QIconViewItem *currentItem, *tmpCurrentItem, *highlightedItem, *startDragItem, *pressedItem, *selectAnchor;
QRect *rubber;
+ QPixmap *backBuffer;
QTimer *scrollTimer, *adjustTimer, *updateTimer, *inputTimer,
*fullRedrawTimer;
int rastX, rastY, spacing;
@@ -2263,6 +2264,7 @@
d->currentItem = 0;
d->highlightedItem = 0;
d->rubber = 0;
+ d->backBuffer = 0;
d->scrollTimer = 0;
d->startDragItem = 0;
d->tmpCurrentItem = 0;
@@ -2411,6 +2413,8 @@
delete item;
item = tmp;
}
+ delete d->backBuffer;
+ d->backBuffer = 0;
delete d->fm;
d->fm = 0;
#ifndef QT_NO_TOOLTIP
@@ -2877,6 +2881,48 @@
}
/*!
+ This function grabs all paintevents that otherwise would have been
+ processed by the QScrollView::viewportPaintEvent(). Here we use a
+ doublebuffer to reduce 'on-paint' flickering on QIconView
+ (and of course its childs).
+
+ \sa QScrollView::viewportPaintEvent(), QIconView::drawContents()
+*/
+
+void QIconView::bufferedPaintEvent( QPaintEvent* pe )
+{
+ QWidget* vp = viewport();
+ QRect r = pe->rect() & vp->rect();
+ int ex = r.x() + contentsX();
+ int ey = r.y() + contentsY();
+ int ew = r.width();
+ int eh = r.height();
+
+ if ( !d->backBuffer )
+ d->backBuffer = new QPixmap(vp->size());
+ if ( d->backBuffer->size() != vp->size() ) {
+ //Resize function (with hysteesis). Uses a good compromise between memory
+ //consumption and speed (number) of resizes.
+ float newWidth = (float)vp->width();
+ float newHeight = (float)vp->height();
+ if ( newWidth > d->backBuffer->width() || newHeight > d->backBuffer->height() )
+ {
+ newWidth *= 1.1892;
+ newHeight *= 1.1892;
+ d->backBuffer->resize( (int)newWidth, (int)newHeight );
+ } else if ( 1.5*newWidth < d->backBuffer->width() || 1.5*newHeight < d->backBuffer->height() )
+ d->backBuffer->resize( (int)newWidth, (int)newHeight );
+ }
+
+ QPainter p;
+ p.begin(d->backBuffer, vp);
+ drawContentsOffset(&p, contentsX(), contentsY(), ex, ey, ew, eh);
+ p.end();
+ bitBlt(vp, r.x(), r.y(), d->backBuffer, r.x(), r.y(), ew, eh);
+}
+
+/*!
+
\reimp
*/
@@ -4855,7 +4901,7 @@
if ( !d->rubber )
drawDragShapes( d->oldDragPos );
}
- viewportPaintEvent( (QPaintEvent*)e );
+ bufferedPaintEvent ((QPaintEvent*)e );
if ( d->dragging ) {
if ( !d->rubber )
drawDragShapes( d->oldDragPos );
@@ -5286,11 +5332,19 @@
return;
if ( item->d->container1 && d->firstContainer ) {
- item->d->container1->items.removeRef( item );
+ //Special-case checking of the last item, since this may be
+ //called a few times for the same item.
+ if (item->d->container1->items.last() == item)
+ item->d->container1->items.removeLast();
+ else
+ item->d->container1->items.removeRef( item );
}
item->d->container1 = 0;
if ( item->d->container2 && d->firstContainer ) {
- item->d->container2->items.removeRef( item );
+ if (item->d->container2->items.last() == item)
+ item->d->container2->items.removeLast();
+ else
+ item->d->container2->items.removeRef( item );
}
item->d->container2 = 0;
diff -u qt-2.3.7_old/src/iconview/qiconview.h qt-2.3.7/src/iconview/qiconview.h
--- qt-2.3.7_old/src/iconview/qiconview.h 2004-06-13 22:29:56.000000000 +0200
+++ qt-2.3.7/src/iconview/qiconview.h 2004-06-13 22:33:32.000000000 +0200
@@ -444,6 +444,7 @@
virtual void contentsDropEvent( QDropEvent *e );
#endif
+ void bufferedPaintEvent( QPaintEvent* );
virtual void resizeEvent( QResizeEvent* e );
virtual void keyPressEvent( QKeyEvent *e );
virtual void focusInEvent( QFocusEvent *e );
--- qt-2.3.7-old/src/widgets/qscrollview.cpp 2004-07-23 15:22:56.000000000 +0200
+++ qt-2.3.7/src/widgets/qscrollview.cpp 2004-07-23 19:23:10.000000000 +0200
@@ -1266,6 +1277,9 @@
case QEvent::LayoutHint:
d->autoResizeHint(this);
break;
+ case QEvent::WindowActivate:
+ case QEvent::WindowDeactivate:
+ return TRUE;
default:
break;
}
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