Re: OpenType font variations and cairo

Also, here's how you can test with pango-view:

$ pango-view --text Test --font 'voto serif gx 123 @wght=900'

Currently it's broken completely.  I'm investigating.

On Thu, Sep 28, 2017 at 7:03 PM, Behdad Esfahbod <[email protected]>
wrote:

> +Khaled,Werner
>
> Two things:
>
>   * Werner, please please please remove code that change
> face->face_index.  It's bad bad bad.
>
>   * With Matthias's branch, we break Khaled's code, ie. if user creates
> FT_Face, sets variations on it, and creates cairo_face_t from, we reset /
> ignore those variations.  The fix would require savings the variations that
> were on the face when face was created, and use those instead of
> instance-defaults in apply_variations().  Matthias, any chance you can do
> this?
>
> b
>
> On Thu, Sep 28, 2017 at 7:01 PM, Behdad Esfahbod <
> [email protected]> wrote:
>
>> On Thu, Sep 28, 2017 at 6:09 PM, Adrian Johnson <[email protected]>
>> wrote:
>>
>>> On 29/09/17 06:06, Matthias Clasen wrote:
>>> I pulled your latest changes and tested with various combinations of
>>> freetype and fontconfig - see below. All good on the cairo side, except
>>> for the build fail with FT 2.6.3 but I mentioned that needs fixing in my
>>> review comments.
>>>
>>> There appears to be a bug in fontconfig master when using freetype 2.8.
>>>
>>> If you cleanup and rebase your commits to master with all review
>>> comments addressed, I'll do a final check and then it should be good to
>>> commit.
>>>
>>
>> Thanks Adrian for all the help.
>>
>> freetype 2.6.3: build failed - FT_Get_Var_Design_Coordinates not found
>>>
>>> freetype 2.8, fontconfig 2.11.0 : pass
>>>
>>> freetype 2.8, fontconfig 2.12.5 : pass
>>>
>>> freetype 2.8, fontconfig master :
>>>
>>> When running the fc-cache built from master I get:
>>>   fc-cache: fcfreetype.c:2143: IA__FcFreeTypeQueryAll: Assertion
>>>   `mm_var' failed.
>>>
>>> fc-cache succeeds after removing AdobeVFPrototype.ttf from ~/.fonts
>>>
>>> I tried again with AdobeVFPrototype.otf. fc-cache ran successfully and
>>> the cairo test passed.
>>>
>>
>> Humm.  This sounds very much like what might happen with old FreeType .
>> If not, can you elaborate what happens again?  Can you reproduce?  What
>> FreeType exactly?   Does `fc-query AdobeVFPrototype.ttf` work?
>>
>> I can probably replace assert with a less harsh mode of failure.
>>
>>
>>
>>> freetype 2.8.1, fontconfig 2.11.0 : pass
>>>
>>> freetype 2.8.1, fontconfig 2.12.5 : pass
>>>
>>> freetype 2.8.1, fontconfig master : pass
>>>
>>> freetype master, fontconfig master : pass
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>> --
>> behdad
>> http://behdad.org/
>>
>
>
>
> --
> behdad
> http://behdad.org/
>



-- 
behdad
http://behdad.org/

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