Re: [Fontforge-users] Another puzzle with Hebrew ligatures

[George W. <gw...@si...>]

On Wed, 2007-10-10 at 14:03, Mark E. Shoulson wrote:
> When editing U+FB4F HEBREW LIGATURE ALEF LAMED, I find that adding 
> anchor points only gives me one of each, set to type "Base Char".  The 
> "Base Lig" type is greyed-out and inaccessible.  But I know it's 
> possible; I think that's what it used to do, and I have seen proper 
> multiple ligature-appropriate anchors when reverse-engineering other 
> Hebrew fonts.
You must define a mark to ligature lookup before you can use base
ligatures.
> 
> 
> This is even when the character's OT glyph class is explicitly set to 
> "Base Ligature" (and not left on Automatic).
This is irrelevant in this context.
> 
> 
> (actually, I even tried hacking the SFD file, copying the syntax from a 
> reverse-engineered Hebrew font.  It showed up as a ligature anchor, but 
> the "Base Lig" type was still greyed-out, even though it was selected, 
> whereas in the other font it was normal.  I put the SFD back the way I 
> found it)
Don't do that. You can't have a base ligature in a mark-to-base lookup,
the OT formats are different.