On Sat, Jul 15, 2017 at 4:05 AM, Uli Schlachter <psyc...@znc.in> wrote:
> On 07.07.2017 15:23, Matthias Clasen wrote: > > On Sat, Jul 1, 2017 at 2:25 AM, Uli Schlachter <psyc...@znc.in> wrote: > >> On 30.06.2017 17:29, Behdad Esfahbod wrote: > >>> On Jun 30, 2017 7:51 PM, "Matthias Clasen" <mcla...@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.
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