Abdelrazak Younes wrote:
Andre Poenitz wrote:
On Wed, Jun 14, 2006 at 10:05:33AM +0200, Abdelrazak Younes wrote:
The more I think about it the more I reckon Qt painting speed is not
the issue. This is comforted by these numbers:
-Modules, 42.530127
-QtGui4.dll (SymExport), 18.157461
QPainter::drawTextItem, 3.968417
QPainter::drawPixmap, 1.599013
Where are the remaining 12 or 13 seconds?
Most likely in the row breaking code and in *.width() calls.
I think there might be something about the frequency of the
paintEvent. Qt4 adjust the number of paintEvent per second depending
on the need but there's a maximum update rate.
Is there some documentation about this behaviour?
No, only what I write on this list :-)
More seriously, I understood that by putting a:
cout << i++ << " " ;
in WorkArea::paintEvent(). When nothing is done and the cursor is not
visible I only see a few screen update per second. With cursor blinking
it's a bit more and when you scroll down with PageDown, it's a lot more.
I tried to force a repaint instead of an update in WorkArea::expose but
I get the exact same performance WRT srolling UserGuide. So I guess I am
wrong here... Not the first time I say that :-(
Abdel.
