[cairo] Color fonts

Sat Jul 29 15:30:11 UTC 2017

On Sat, Jul 29, 2017 at 11:58 AM, Uli Schlachter <psychon at znc.in> wrote:

> Hi Behdad
>
> I don't think that is my decision to make. When thinking about "fonts in
> cairo", I'm thinking "Behdad". I'm just asking weird questions from the
> sideline. :-)
>

Thanks. :-)  Pushed!!!!  At least ten people already asked me "what's up
with emoji" at GUADEC...

> Uli
>
> P.S.: How relevant and up to date is the CC list here? I always get a
> "your message to gtk-devel-list awaits moderator approval"-mail when
> replying to this thread...
>

My messages go through, yours probably don't because you are not a member.
It's valuable still.

Cheers,
b

> On 28.07.2017 16:38, Behdad Esfahbod wrote:
> > Uli,
> >
> > Can we commit this?  I don't think waiting another few years will result
> in
> > a superior patchset. :)
> >
> > Cheers,
> >
> > behdad
> >
> > On Wed, Jul 19, 2017 at 1:53 AM, Behdad Esfahbod <behdad at behdad.org>
> wrote:
> >
> >> Right.  In the future we would want to make it show glyphs in the input
> >> order, ie. not separate color vs non-color.  That's the order required
> by
> >> CSS for example.  In a show-text-glyphs call with
> CAIRO_TEXT_CLUSTER_FLAG_BACKWARD,
> >> it might be desirable to show back-to-front.
> >>
> >> On Tue, Jul 18, 2017 at 1:59 PM, Matthias Clasen <
> >> matthias.clasen at gmail.com> wrote:
> >>
> >>> On Sat, Jul 15, 2017 at 4:05 AM, Uli Schlachter <psychon at znc.in>
> wrote:
> >>>
> >>>> On 07.07.2017 15:23, Matthias Clasen wrote:
> >>>>> On Sat, Jul 1, 2017 at 2:25 AM, Uli Schlachter <psychon at znc.in>
> wrote:
> >>>>>> On 30.06.2017 17:29, Behdad Esfahbod wrote:
> >>>>>>> On Jun 30, 2017 7:51 PM, "Matthias Clasen" <mclasen at redhat.com>
> >>>> wrote:
> >>>>>>> On Fri, 2017-06-30 at 17:02 +0200, Uli Schlachter wrote:
> >>>>>>>> On 28.06.2017 14:23, Behdad Esfahbod wrote:
> >>>>>>>>> All of you have asked me about the status of color fonts in
> >>>>>>>>> cairo.  There's
> >>>>>>>>> some discussion here:
> >>>>>>>>
> >>>>>>>> what was the solution to make this fit into cairo's drawing model?
> >>>>>>>> Text
> >>>>>>>> / glyphs are used as a mask and a mask does not have colors.
> >>>>>>>>
> >>>>>>>
> >>>>>>> There is no solution to that. The assumption in cairo's drawing
> model
> >>>>>>> about glyphs/fonts has simply been invalidated by reality.
> >>>>>>>
> >>>>>>>
> >>>>>>> Correct.
> >>>>>>
> >>>>>> Okay... so what is the new model? What happens when I draw a color
> >>>> glyph
> >>>>>> with operator XOR and a red source?
> >>>>>
> >>>>>
> >>>>> The red source is ignored for color glyphs because they are used as
> the
> >>>>> source.
> >>>>
> >>>> Hi again,
> >>>>
> >>>> I just came up with another question: How are overlapping glyphs
> handled?
> >>>>
> >>>> Let's say I have a red glyph and a blue glyph and I draw them in such
> a
> >>>> way that they overlap. Let's say this additionally overlaps with a
> >>>> non-colored glyph in the same position and I use a green source with
> 50%
> >>>> alpha (cairo_set_source_rgba(cr, 0, 1, 0, 0.5)).
> >>>>
> >>>> What's the visible result?
> >>>>
> >>>>
> >>> Here is what my implementation does: It renders the color glyphs, in
> >>> order, followed by the non-color glyphs.
> >>>
> >>> In practice, I don't think the case of mixed color and non-color glyphs
> >>> in the same call will be all that common.
> >>> Most apps will explicitly set a color font just for the emoji and they
> >>> won't render regular text with an emoji font,
> >>> with the result that runs of color glyphs and non-color glyphs will
> >>> typically be in separate calls.
> >>>
> >>
> >>
> >>
> >> --
> >> behdad
> >> http://behdad.org/
> >>
> >
> >
> >
>
>
> --
> "Why make things difficult, when it is possible to make them cryptic
> and totally illogical, with just a little bit more effort?" -- A. P. J.
>

-- 
behdad
http://behdad.org/
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