423632 - small gaps show up in Arabic text at large sizes

Status: NEW

(Core :: Graphics: Text, defect, P3)

Description

[John Daggett (:jtd)]

Attachment: testcase, small 1px gaps show in Arabic text

When rendered at large sizes, small gaps show up in Arabic text.  The attached testcase shows this for huge text but the problem occurs at sizes even as small as 36pt.  There consistently seems to be a 1px white gap between some of the glyphs, this spacing doesn't change when shrinking and enlarging the text.

Comment 1

[John Daggett (:jtd)]

Attachment: screenshot, shows gaps in Arabic text

Comment 2

[Smokey Ardisson (offline for a while; not following bugs - do not email)]

This is a long-time OS or font bug.  It happens in TextEdit, too (or at least pre-CoreText TextEdits; I'm not at the right Mac right now to check 10.5 atm). It's really a shame, since DecoType Naskh is such a lovely face; I just try not to use it for screen matter intended for large sizes (the gaps go away when printed).

Comment 3

[Smokey Ardisson (offline for a while; not following bugs - do not email)]

Yeah, I see this in Safari 3 and TextEdit on 10.5, too.  My guess is there's nothing we can do about it (though I'd of course love to be proven wrong if someone had a lot of free time ;) ).

Comment 4

[Vladimir Vukicevic [:vlad] [:vladv] (needinfo me, slow to respond)]

Is this just with that particular font?  If so, I'd minus this (and possibly set a different default font), because it sounds like it's an OS/font level issue.

Comment 5

[Smokey Ardisson (offline for a while; not following bugs - do not email)]

(In reply to comment #4)
> Is this just with that particular font?  

Yes (or at least it is for me).

> If so, I'd minus this (and possibly set a different default font),

It's only the default for the "cursive" style, so I don't think that's much of an issue; 99.99999% of users won't see this problem.

Comment 6

[Vladimir Vukicevic [:vlad] [:vladv] (needinfo me, slow to respond)]

Yeah, -'ing.. would be nice to special-case this font if we can figure out the right workaround in the future.

Comment 7

[John Daggett (:jtd)]

Yeah, this doesn't need to block if it's really an underlying font/system problem.  When we have time we can dig into a little more and log a bug with Apple to try and get it fixed on their end.

Comment 8

[Sylvestre Ledru [:Sylvestre]]

Moving to p3 because no activity for at least 1 year(s).
See https://github.com/mozilla/bug-handling/blob/master/policy/triage-bugzilla.md#how-do-you-triage for more information