Bennett Helm wrote:
On May 29, 2006, at 12:52 PM, Bennett Helm wrote:
I've tried it with 1.4/qt3 on Mac. It seems to help in two respects:
1. scrolling speed gives me an improvement similar to what Abdel
reported: 39 seconds down to 35.
2. although typing doesn't lag on either version, without the patch I
can push processor usage up to 75-80% when typing fast in lyx, whereas
with it I can't get above 50%.
I'll test later to see if it makes LyX/Mac on my slow (466MHz) laptop
bearable.
Now I've tested: it is usable on my slow laptop, but it just barely
keeps up with typing speed. More speed improvements would be welcome,
but this is a great help.
I have been experimenting using a QPicture "cache" inside QLPainter
instead of drawing directly to the pixmap for each operation. The
purpose of a QPicture is to record painting operation and replay them on
a file, an image or the screen when told to. The gain in speed is
*impressive*. Unfortunately the lyx core drawing assumes that the
painting device is a pixmap so the drawing on screen is all scrambled.
Fixing the drawing routine would break the other frontends so I don't
think this would be a welcome change in the short term.
In the longer term, I think it should be possible to use Qt rich text
editor directly instead of doing everything by hand.
Abdel.
