Re: OpenType Patches

[Eric Mader <mader jtcsv com>]

At 07:10 PM 8/30/2002, I wrote:
> I've been chasing an obscure bug having to do with accent positioning in 
> OpenType fonts. The symptom is that sometimes, accents are positioned too 
> far to left. After chasing my tail for quite a while, I've narrowed this 
> bug down to the fact that the face the indic-ot shaper passes to the 
> OpenType routines has face->size.metrics.x_scale == 0. (actually 
> everything in the metrics record is zero) This causes the OT code which 
> returns anchor points to return them all as zero 'cause it multiplies to 
> co-ordinates by x_scale. My shaper gets the face like this:
>
>     face = pango_xft_font_lock_face (font);
>
> So I assume that the problem is somewhere in pango_xft_font_lock_face... 
> does anybody have any idea where I should start looking?

I've tracked this some more; pango_xft_font_lock_face ends up calling 
_XftLockFile, which may call FT_New_Face if f->face is null. I assume that 
the face returned by FT_New_Face would have face->size->metrics.x_scale == 
0. Can anybody confirm that this is indeed the problem? Better still, does 
anybody have any idea what to do about this?

Regards,
Eric