[ft-devel] Problem with ligatures and strikes

[Behdad Esfahbod]

Hi,

The Calibri font shipped in Windows XP has bitmap strikes for a variety of
sizes, but from what I understand, no bitmap glyphs for many ligature
combination it defines in its GSUB table, for example, for 'tt', 'ft', 'ffi'
among others.  That results in very ugly rendering (see attached).

My question is, how does Windows deal with this?  Do they turn certain
features off if using strikes?  Not form the ligature if not found in the
current strike?  I need help understanding this to implement the correct
behavior since I don't have access to Windows.

behdad

strike.png
Description: PNG image