[Bug 13801] Very slow text rendering in AutoCAD

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=13801





--- Comment #43 from max at veneto.com  2009-07-08 04:36:37 ---
(In reply to comment #42)
> Hi,
> 
> I'm working on replacing big chunks of the Wine bitblt code with XRender. This
> will in the end also eliminate some DIB bottlenecks because XRender can do
> depth conversion, so we don't have to that during a X11DRV_DIB_SetImageBits and
> in other places.
> 
> It was mentioned in this bug report that text rendering is slow due to a part
> of the DIB stuff. Did you perform any profiling e.g. using sysprof/oprofile to
> see which functions consume most time? In the report depth conversion isn't
> mentioned but I guess that this might be one of the most time consuming parts.
> Is this the case? My work might be able to accelerate AutoCad quite a bit (sure
> not as much as a complete DIB engine).
> 
> Roderick

I didn't make a true profiling, but some (long) time ago I traced down the code
flow, and the bottleneck was (IIRC....) on ExtTextOut function, which did some
DIB_Coerce() calls. Removing the coerce stuffs gave back the speed at the
expense of missing text, obviously. The problem is not the bitblt, but the text
output on a dib with format different than screen's one. I guess your patch
won't speed up this stuff.....
Of course, if you have a way to use XRENDER to paint fonts on different bit
depths without doing a conversion, then yes, you can have the speed gain.
But then you should patch ExtTextOut() functions to use yours.

Ciao

Max

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