On 10/6/14 03:05, Martin Hosken wrote:
Dear Jonathan,
Our current mark-zeroing code, in zero_mark_widths_by_gdef() and
zero_mark_widths_by_unicode(), modifies only the advance of the glyphs,
so that they no longer take up any space on the line.
I'm wondering whether we should also adjust the offset, by subtracting
the advance from it before we zero the advance. (Though perhaps only if
there's no GPOS positioning?)
How would that affect anchor positioning? Would the offset be ignored or would
one need to subtract the advance from all the anchors too?
This is part of the heuristics to try and make legacy fonts that lack
real layout tables behave acceptably. So I'd suggest we only do this if
the font does not include actual GPOS positioning rules. If it does,
then we trust them.
JK
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