[cairo] Color fonts

[Matthias Clasen]

On Wed, Jun 28, 2017 at 8:23 AM, Behdad Esfahbod <behdad at behdad.org> wrote:

> Hello,
>
> All of you have asked me about the status of color fonts in cairo.
> There's some discussion here:
>
> https://github.com/googlei18n/noto-emoji/issues/36
>
> The remaining part is indeed the cairo patchset.  Matthias had a reworked
> version, which Chris Wilson objected to.  I agree with parts of his
> objection.  In particular, I don't think we should need to touch every
> compositor.
>
> IMO, this is how it should work:
>
>   - Extend glyph cache to also hold a color-glyph object possibly,
>
>   - Early on, perhals in _cairo_surface_show_text_glyphs(), ask
> scaled_font to see if it has color.  If it does, call a special function
> that iterates over the glyphs, for each, load it and see if it has color.
> Show the color ones using image ops, show the rest using text ops. Or just
> show all as image ops, that's feasible too.
>
> With the above, we wouldn't need to touch any compositor whatsoever.
>
> Unfortunately I'm too busy / lazy to do this any time soon.  However, I
> just bought my ticket to GUADEC, so working on it together there definitely
> is an option.
>
>
Thanks for the guidance on fixing up the cairo patchset. And yay for coming
to GUADEC!
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