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Old 07-20-06, 03:07 PM   #88
Linuxhippy
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Join Date: Feb 2004
Posts: 585
Default Re: Slow AA text rendering in KDE

I just wanted to warm-up this topic ... since I guess I've found an explanation why GTK performs much better than QT based applications.

GTK uses a lot of very short-living pixmaps which are never moved to vram (so, almost all rendering in GTK applications is done in software and you GPU stays unused).
And because the most expensive part of software rendering to hw-accalerated surfaces is vram-readback and upload its a lot faster since the desination surface is already in RAM.
After drawing a singly large ram->vram transport happens instead of many small ones, which again should be faster.

So GTK has faster subipxel-rendering more or less through an accident, but looses almost all possible hw-accalerated drawing. I hope both problems will be addressed in future.

lg Clemens
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