Re: [cairo] Color fonts
- Date: Fri, 28 Jul 2017 15:38:45 +0100
- From: Behdad Esfahbod <behdad@xxxxxxxxxx>
- Subject: Re: [cairo] Color fonts
Uli,Can we commit this? I don't think waiting another few years will result in a superior patchset. :)
On Wed, Jul 19, 2017 at 1:53 AM, Behdad Esfahbod <behdad@xxxxxxxxxx> 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@xxxxxxxxx> wrote:On Sat, Jul 15, 2017 at 4:05 AM, Uli Schlachter <psychon@xxxxxx> wrote:On 07.07.2017 15:23, Matthias Clasen wrote:
> On Sat, Jul 1, 2017 at 2:25 AM, Uli Schlachter <psychon@xxxxxx> wrote:
>> On 30.06.2017 17:29, Behdad Esfahbod wrote:
>>> On Jun 30, 2017 7:51 PM, "Matthias Clasen" <mclasen@xxxxxxxxxx> 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?
>>>> / 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.
>> 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
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
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