<div dir="ltr">On Sat, Jul 15, 2017 at 4:05 AM, Uli Schlachter <<a href="mailto:psychon@znc.in" target="_blank">psychon@znc.in</a>> wrote: <div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On 07.07.2017 15:23, Matthias Clasen wrote: > On Sat, Jul 1, 2017 at 2:25 AM, Uli Schlachter <<a href="mailto:psychon@znc.in">psychon@znc.in</a>> wrote: >> On 30.06.2017 17:29, Behdad Esfahbod wrote: >>> On Jun 30, 2017 7:51 PM, "Matthias Clasen" <<a href="mailto:mclasen@redhat.com">mclasen@redhat.com</a>> 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? </blockquote><div> </div><div>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. </div></div></div></div>