[Devel] Line Gap / TrueType fonts

[Robert Dolan]

Hello,

Can someone tell me why height is adjusted in sfobjs.c when the horizontal 
header table line gap is 0?

from sfobjs.c:

        /* if the line_gap is 0, we add an extra 15% to the text height --  */
        /* this computation is based on various versions of Times New Roman */
        if ( face->horizontal.Line_Gap == 0 )
          root->height = (FT_Short)( ( root->height * 115 + 50 ) / 100 );

Fonts with form drawing characters and some symbol fonts have a line gap of 0 
by design.  Adding 15% to the height is causing problems for me when it comes 
to supporting legacy code that relies on form characters.  Things seem to be 
much better after removing the height adjustment.

Are there any pitfalls that await me if I push forward and take the horizontal 
header line gap as is?

Rob Dolan