[Bug 13801] Very slow text rendering in AutoCAD

[wine-bugs at winehq.org]

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

--- Comment #47 from max at veneto.com 2010-09-12 10:09:02 CDT ---
(In reply to comment #46)
> I just installed the Autocad 2008 trial to test the speed of font rendering
> when font-smoothing is both enabled and disabled (recently Thunderbird and I
> noticed that font rendering can be 70x faster if font smoothing is enabled).
> 
> However, I've been totally unable to find any slow down at all. Everything is
> quite snappy with both smoothing enabled and disabled and using the attached
> samples.
> 
> Max, can you retest this in 1.1.26 without the DIB engine? I'm wondering if
> Thunderbird's recent XRender updates have had a knock on effect. It might just
> be that my PC is too fast to notice though :)

Hi Luke,

I tested it recently on a production drawing, and the slowness is still there.
If you don't notice it, check if :

1) You've got enough text on display, and test it on various zoom scales
2) You've got TT fonts on display. The default (txt) font used by autocad is a
self-drawn vector font which doesn't suffer of the problem. Even if you open a
drawing which contains TT fonts, if they're not installed on your system
they'll be replaced by txt and so are fast.

So, if you want to test it correctly, do the following :

1) Install msttcorefonts (for example with winetricks)
2) create a new drawing, set up a style using, for example, arial font
3) Draw some hundreds of texts with it. You can do multiple copies of the same
text.

You'll notice the difference from vector fonts (txt, simplex, romans, romand)
and TT fonts (arial, ....) as latter appears filled, former just outlined (and
looks ugly....).
You'll see that with enough text displayed panning the drawing becomes
completely useless, you'll need some seconds (!!!) to pan the drawing.
With the engine enabled, it's instantaneous.

Ciao

Max

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