<div dir="ltr">It was actually not that complicated: <a href="https://bugs.freedesktop.org/show_bug.cgi?id=102661">https://bugs.freedesktop.org/show_bug.cgi?id=102661</a> </div><div class="gmail_extra"> <div class="gmail_quote">On Mon, Sep 11, 2017 at 1:44 AM, Uli Schlachter <<a href="mailto:psychon@znc.in" target="_blank">psychon@znc.in</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi everyone, yesterday I was asked to comment here: <a href="https://github.com/i3/i3/pull/2925" rel="noreferrer" target="_blank">https://github.com/i3/i3/pull/2925</a> The issue seems to be: With operator SOURCE, drawing a color glyph clears the entire surface. So, while "normal" glyphs are supposed to be a mask that is then filled, color glyphs seem to be handled as an unbounded source. This doesn't make a difference for OVER, but for lots of other operators (at least SOURCE) it obviously matters. I didn't investigate this at all. I did not even try to reproduce. Hence, this ping. Could one of you please look at this, confirm this really happens, and say what should be done about this? Thanks. And yes, in the thread on color fonts, Matthias Clasen answered one of my questions with: >> 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. So apparently this behaviour is by design, meaning that glyphs can only really be used with operator OVER any more (well, and some others). So let me ask this another why: Is this really a good behaviour? Oh and one more thing: Who updates cairo's docs and all the explanations on the web page? ("glyphs work like this, except when they do not"). Cheers, Uli P.S.: The list of recipents is copied from the recent thread on color fonts. I have no overview of how people ended up in this list. Sorry if $YOU are the wrong recipent. P.P.S: Yes, I also included Gtk-devel-list. I vaguely remember someone saying that this stuff is relevant there. Dear moderator, sorry for the work that this causes you. -- 99 little bugs in the code 99 little bugs in the code Take one down, patch it around 117 little bugs in the code -- @irqed </blockquote></div> -- <div class="gmail_signature" data-smartmail="gmail_signature">behdad <a href="http://behdad.org/" target="_blank">http://behdad.org/</a></div> </div>