[cairo] OpenType font variations and cairo

[Behdad Esfahbod]

On Thu, Sep 14, 2017 at 2:54 PM, Adrian Johnson <ajohnson at redneon.com>
wrote:

> On 15/09/17 05:52, Matthias Clasen wrote:
> > On Thu, Sep 14, 2017 at 12:37 PM, Behdad Esfahbod
> > <behdad.esfahbod at gmail.com <mailto:behdad.esfahbod at gmail.com>> wrote:
> >
> >     Thanks Matthias.  I took a look at the patch.  Looks good!  Minor
> >     comments:
> >
> >     - Moving the format towards CSS by default (no comma, no equal sign;
> >     just spaces!) while accepting both is what I do in HarfBuzz. Maybe
> >     advertise the same here,  UPDATE: I was wrong.  CSS uses comma as
> >     well.  It's the equal sign that they don't use, they use space.  We
> >     should accept both.
> >
> >
> > I've made the parser a bit more flexible. It now accepts variations like
> >
> > wdth=200,wght=300
> > wdth 200, wght=300
> > wdth 200 , wght 300
>
> Does it work with decimal commas?
>

Good point.  HarfBuzz has same problem.  glib has g_ascii_strtod() that
always uses '.' as decimal separator.  We need something like that in cairo
and HarfBuzz.  Such a pain :(.

  https://git.gnome.org/browse/glib/tree/glib/gstrfuncs.c#n687


>
> >
> >     - Maybe make the variations member be "const char *" instead of
> >     "char *".
> >
> >
> > But I'm strdup'ing and freeing it. The const will get in the way there.
> >
> >
> >     - In +cairo_font_options_set_variations(), typically in these kinds
> >     of functions I like copying then freeing the old value, such that
> >     the input can be the return value of get_variations() on the same
> >     object.
> >
> >
> > Done
> >
> >
> >     -
> >     (((uint8_t)p[0])<<24)|(((uint8_t)p[1])<<16)|(((uint8_t)
> p[2])<<8)|((uint8_t)p[3]);
> >     FreeType has a macro for that: FT_MAKE_TAG()
> >
> >
> > Thanks for the reminder. Done.
> >
> >     (Generally I find it easier pushing a tree on github and reviewing
> >     there; also because I can just fix stuff and push my own tree.)
> >
> >
> > You can find the new version here:
> >
> > https://github.com/matthiasclasen/cairo/commits/
> wip/matthiasc/font-variations
> >
> >
> >
>
>


-- 
behdad
http://behdad.org/
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