On 12/12/2012 12:53 PM, Thorsten Behrens wrote:
Kohei Yoshida wrote:
I'm just wondering, whether our anti-aliasing is done strictly at software
level, or via hardware, and if former, what it would take to do it via
hardware so that we can take advantage of GPU to speed it up if it's there.
On Linux, we use cairo, and XRender directly in vcl, so in theory that
trapezoid rendering should be hw-accelerated. There were some
unfortunate impedance mismatches though between cairo and gpu
semantics, so at times this will fallback to software rendering.
Thanks for the info. So, I'm guess this fallback happens inside cairo
library? IOW there isn't much we can do about it on the LibreOffice side?
My main concern was that, and the reason why I asked it was that when
the anti-aliasing is enabled, the scrolling inside some quite complex
Draw document becomes very very slow, and wondered if there was anything
we could do about it. When anti-alising is disabled, the scroll becomes
smooth again.
Anyway, thanks a lot. I'll sit on this.
Kohei
--
Kohei Yoshida, LibreOffice hacker, Calc
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