[cairo] Division by zero in cairo-ft-font.c

[Keith Packard]

On Fri, 2005-07-22 at 18:24 -0400, Owen Taylor wrote:
> Turns out that loading a size zero font was causing badness:
> 
>  http://bugzilla.gnome.org/show_bug.cgi?id=311299
> 
> Absolutley huge (700M+) surfaces were  being created for glyphs,
> etc.
> 
> I put in a pretty quick fix, attached below. I'm not absolutely
> sure that there aren't still problems with near zero fonts, but
> being late on a Friday, I just wanted to get something in that
> would stop the problems.

Your fix looks pretty reasonable. We might treat 'really small' fonts as
if they were zero as well. As scaled fonts are immutable, we'd do that
when creating the font though.

-keith

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