773154 - use of per-word shaping breaks contextual rules used in OpenType features

Status: RESOLVED DUPLICATE of bug 761442

(Core :: Graphics: Text, defect)

Description

[John Daggett (:jtd)]

Attachment: screenshot, trunk vs. chrome dev rendering

Steps: open the linked testcase

Result: several of the symbols do not display correctly, the 2nd and 3rd columns should display identically.

The font includes contextual ligatures for things like "thumbs up".  Since the shaping code breaks this up into "thumbs" and "up", we lose the ability to match those contextual rules.

Comment 1

[John Daggett (:jtd)]

We probably should take into account the maxContext data in the OS/2 table:

http://www.microsoft.com/typography/otspec/os2.htm#mc

Comment 2

[Robert O'Callahan (:roc) (email my personal email if necessary)]

Isn't this a duplicate of bug 761442?

Comment 3

[John Daggett (:jtd)]

(In reply to Robert O'Callahan (:roc) (Mozilla Corporation) from comment #2)
> Isn't this a duplicate of bug 761442?

Ah, right, I did log a bug on this...