[Bug 13801] Very slow text rendering in AutoCAD

wine-bugs at winehq.org wine-bugs at winehq.org
Sat Sep 20 13:29:40 CDT 2008


--- Comment #32 from max at veneto.com  2008-09-20 13:29:40 ---
(In reply to comment #31)
> (In reply to comment #30)
> > I have to retract that. Further experiments reveal that the locking mechanism
> > per se does not cause trouble. The bad performance can be instead attributed to
> > the call to XShmGetImage in X11DRV_DIB_GetImageBits (which is invoked a lot
> > from X11DRV_DIB_Coerce when text rendering operations are performed).
> > Commenting out just that call makes, like the previously described actions, all
> > text disappear and restores good performance.
> > 
> > Elsewhere I read that XShmGetImage may be slow because of pixel data being
> > stored directly in the video memory and having to be transferred to the main
> > memory. Inspired by this explanation, I switched from the proprietary nvidia
> > driver 96.43.07 (my video card is a GeForce4 MX 440 AGP) to the framebuffer
> > device driver. Lo and behold, it also restored good performance! This
> > workaround is easy and good enough for playing the TSE2 game, but probably too
> > drastic in general. However, it could also be that the particular versions of
> > the nvidia driver and video hardware are to blame, so it is recommended that
> > other people try to reproduce this bug to help estimate its significance.
> > 
> I tried to remove the XShmGetImage() call from inside dlls/winex11.drv/dib.c
> but it did nothing to AutoCAD.... uhmm... need some more testing.
> Max

But, indeed, disablng X11DRV_DIB_Coerce() does speed stuffs enormously.... And,
strange enough, the fonts ARE displayed correctly. But, many glitches in
graphics bitmap are present.


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