[cairo] Cairo, pango and Win32.. incorrect font rendering

Peter Clifton pcjc2 at cam.ac.uk
Sat Jan 16 08:38:21 PST 2010

On Sat, 2010-01-16 at 14:12 +0000, Peter Clifton wrote:
> Hi guys,
> Vague I know, but I wondered if this rang any bells.
> The gEDA suite (electronic design tools) now uses cairo and pango to
> render its schematics. This works really well on Linux, and on Mac OSX
> when the right magic is used to build it.
> However, I've just cross-built for Win32, which has worked in the past,
> and have had reported issues of text rendering at the wrong size.
> (See screen-shot here:
> http://www.xs4all.nl/~ljh4timm/downloads/gschem-1.6.0_add_text_testing.png
> )
> The same program works fine under Wine, but fails under Win32. No other
> font rendering in the program, or the toolkit is affected.
> I built with pango-1.26.0 and cairo 1.8.8.
> Configure logs attached.
> Does anyone have any ideas how to debug this (I have no access to a
> Windows machine), or ideas as to what might be wrong?

Further debug info:

The bounding boxes of the characters remain approx. the same size no
matter how you zoom in or out.


This sounds _very_ similar to a bug reported by a user who compiled it
on Mac OS X without the "right" config. In that case, the fonts didn't
scale either - but were reportedly shown much larger.

So I'm guessing this could be our code doing something wrong, or at
least something which doesn't work for non free-type backends. The fact
if behaves differently across different backends does suggest some
inconsistency in them though - even if I'm doing something stupid with
the APIs.

Best wishes,

Peter C.

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