Underline definition

Glyphs
1

If I set custom parameters underlineThickness and underlinePosition in the font master, the underlinePosition is reduced by the half thickness in the post table of the exported font. When I define e.g. thickness 128 and position -256 this results in an actual underlinePosition value of -192. If I reimport the exported font into Glyphs the “corrected” underlinePosition is imported but no thickness value at all. Same in 1.4.4 and 2 Beta.

Edit: If I export as OTF, the values in the CFF Table are correct but not in the post table. If I reimport the OTF the correct position is importet but still no thickness value.

2

That is because these two values are calculated differently. One calculates the offset as the middle of the stroke the other as the upper rim of the stroke.

3

Ok, thanks for clarification. But Glyphs should then recalculate again on import of TTF and also import the thickness value.

4

There was indeed a bug that prevented the thickness to be read correctly. thanks for finding it.

5

The current 1.4.4-603 still dosen’t import the thickness. In Version 2.0.0-640 it is fixed for otf fonts, but with ttf the position value is recalculated wrong. If I export a ttf with thickness 128 and position -256, reimporting the ttf gives a position value of -192 which is off by the half thickness.

6

This issue is now fixed in 2.0.0-653 but still missing in 1.4.4-606. Would be great if pure bugfixes could be backported to G1 for the rest of us who still are on 10.6 to 10.8 … thanks.