[cairo] OpenType font variations and cairo

[Matthias Clasen]

On Thu, Sep 21, 2017 at 5:42 AM, Adrian Johnson <ajohnson at redneon.com>
wrote:

> On 21/09/17 12:03, Matthias Clasen wrote:
> > On Wed, Sep 20, 2017 at 6:15 PM, Behdad Esfahbod
> > <behdad.esfahbod at gmail.com <mailto:behdad.esfahbod at gmail.com>> wrote:
> >
> >     The test was really broken...
> >
> >     Ok, I've pushed some things there that should help Matthias move
> foward:
> >
> >       https://github.com/behdad/cairo/commits/font-variations
> >     <https://github.com/behdad/cairo/commits/font-variations>
> >
> >
> > Thanks for those fixes, Behdad. Taking another look at the test, I'm not
> > sure what I was thinking - it was checking the width axis, but the font
> > we use only has weight and contrast as axes.
> > i've pushed all the fixes to
> >
> > https://github.com/matthiasclasen/cairo/tree/wip/
> matthiasc/font-variations
> >
> > Does this work for you now, Adrian ?
>
> It works with freetype 2.8.0, but not 2.8.1. Here are the results of
> testing with different combinations of freetype and fontconfig.
>
> freetype 2.8.0, fontconfig 2.11.0 : pass
>
> freetype 2.8.0, fontconfig 2.12.5 : pass
>
> freetype 2.8.0, Behdad's fontconfig (2d0063948a44) : pass
>
> freetype 2.8.1, fontconfig 2.11.0 : fail
>
>   axis Weight, value 300
>   axis CNTR, value 0
>   axis Weight, value 0
>   axis CNTR, value 0
>   Axis Weight: not expected value (0 != 300.5)
>
> freetype 2.8.1, fontconfig 2.12.5 : fail
>
>   axis Weight, value 300
>   axis CNTR, value 0
>   axis Weight, value 0
>   axis CNTR, value 0
>   Axis Weight: not expected value (0 != 300.5)
>
> freetype 2.8.1, Behdad's fontconfig (2d0063948a44) : fail
>
>   axis Weight, value 300
>   axis CNTR, value 0
>   axis Weight, value 0
>   axis CNTR, value 0
>   Axis Weight: not expected value (0 != 300.5)
>
>

I'm seeing those failures with freetype 2.8.1 too. They are somewhat
mysterious - if I reorder the tests different ones fail. The fact that they
sometimes report values that are nowhere to be found in the input, and
sometime reports 0, which is not in the allowed range for the axis
makes me think that something goes wrong in freetype.
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