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[patch] The mentioned patch.

flickerfree_qiconview_buffered.patch (text/plain), 3.27 KB, created by Jan Janeček on 2013-02-18 12:01:02 CST

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Description: The mentioned patch.

Filename:

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Creator: Jan Janeček

Created: 2013-02-18 12:01:02 CST

Size: 3.27 KB

patch

obsolete

>Buffered QIconView. > >For every QIconView this patch creates a backbuffer where the image will >grow up (aka will be painted) before blitting the results to the screen. >This solves the konqueror flickering problems at its roots. There are >some more bugs that make conqueror repaint without reason.. patches >will follow. > Enrico Ros <eros.kde@email.it> > >--- src.orig/iconview/qiconview.cpp 2004-03-24 15:58:05.000000000 +0000 >+++ src/iconview/qiconview.cpp 2004-03-30 16:23:32.521253280 +0000 >@@ -211,6 +211,7 @@ > QIconViewItem *currentItem, *tmpCurrentItem, *highlightedItem, > *startDragItem, *pressedItem, *selectAnchor, *renamingItem; > QRect *rubber; >+ QPixmap *backBuffer; > QTimer *scrollTimer, *adjustTimer, *updateTimer, *inputTimer, > *fullRedrawTimer; > int rastX, rastY, spacing; >@@ -2731,6 +2732,7 @@ > d->currentItem = 0; > d->highlightedItem = 0; > d->rubber = 0; >+ d->backBuffer = 0; > d->scrollTimer = 0; > d->startDragItem = 0; > d->tmpCurrentItem = 0; >@@ -2883,6 +2885,8 @@ > delete item; > item = tmp; > } >+ delete d->backBuffer; >+ d->backBuffer = 0; > delete d->fm; > d->fm = 0; > #ifndef QT_NO_TOOLTIP >@@ -4845,6 +4849,47 @@ > #endif > > /*! >+ 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 > */ > >@@ -5627,7 +5676,7 @@ > if ( !d->rubber ) > drawDragShapes( d->oldDragPos ); > } >- viewportPaintEvent( (QPaintEvent*)e ); >+ bufferedPaintEvent( (QPaintEvent*)e ); > if ( d->dragging ) { > if ( !d->rubber ) > drawDragShapes( d->oldDragPos ); >--- src.orig/iconview/qiconview.h 2004-03-30 16:00:47.605751976 +0000 >+++ src/iconview/qiconview.h 2003-05-16 13:02:38.000000000 +0000 >@@ -445,6 +445,7 @@ > void contentsDropEvent( QDropEvent *e ); > #endif > >+ void bufferedPaintEvent( QPaintEvent* ); > void resizeEvent( QResizeEvent* e ); > void keyPressEvent( QKeyEvent *e ); > void focusInEvent( QFocusEvent *e ); View Attachment As Diff View Attachment As Raw

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