[cairo] OpenType font variations and cairo

[Matthias Clasen]

On Wed, Sep 13, 2017 at 6:04 PM, Adrian Johnson <ajohnson at redneon.com>
wrote:

> On 14/09/17 07:11, Matthias Clasen wrote:
> > Over the last few days, Behdad and I worked together on supporting
> > OpenType font variations in the Linux text rendering stack. This
> > requires small additions to pango, fontconfig, and ... cairo.
> >
> > The cairo patch is simple and ready (i'm still debugging some issues on
> > the pango side).
> >
> > It adds a new member to the font options struct, a string which contains
> > the font variation settings.
> >
> >
>
> > + * Sets the OpenType font variations for the font options object.
> > + * Font variations are specified as a string of the form
> > + * AXIS1=VALUE1,AXIS2=VALUE2,... with each AXIS being a 4 character
> > + * tag naming a font variation axis such as wdth or wght, and each
> > + * VALUE being a floating point number.
>
> cairo_tag_begin() attributes uses space instead of comma to separate a
> list of key=value. Maybe we could try to be consistent?
>

I don't have a strong opinion on this. The current format is convenient,
since we can pass it through directly from PangoFontDescription. A
space-separated format would be harder to integrate there.

The pango patch I mentioned is working now, you can find it here:
https://bugzilla.gnome.org/show_bug.cgi?id=786016
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