On 29/08/2023 19:27, Heiko Oberdiek via luatex wrote:
Hello,
using LuaTeX to review the glyphs of a font, I discovered an oddity
about U+0387 ANO TELEIA. LuaTeX shows U+00B7 MIDDLE DOT instead.
Minimal example (the font does not matter, if it contains both glyphs
that are different in some way, e.g. shape or position):
\documentclass{standalone}
\usepackage{fontspec}
\newfontface\TestFont{FreeSans.ttf}
\begin{document}
\TestFont
\symbol{"00B7}% MIDDLE DOT
\symbol{"0387}% ANO TELEIA
\end{document}
The bounding boxes of the glyphs can be retrieved with FontForge:
#!/usr/bin/env fontforge
import fontforge
font = fontforge.open('FreeSans.ttf')
print(f'U+00B7: {font[0x00B7].boundingBox()}')
print(f'U+0387: {font[0x0387].boundingBox()}')
The result:
U+00B7: (87.0, 227.0, 191.0, 331.0)
U+0387: (86.0, 420.0, 190.0, 524.0)
The vertical positions of the dots are quite different with
U+0387 at a higher position.
* But LuaTeX 1.16.0 (TeX Live 2023/Cygwin) with
development id 7567 shows the middle dot in both cases.
* XeTeX 3.141592653-2.6-0.999995 (TeX Live 2023/Cygwin)
shows the expected result where U+0387 is shown at a
higher vertical position.
Yours sincerely
Heiko
From UnicodeData.txt:
0387;GREEK ANO TELEIA;Po;0;ON;00B7;;;;N;;;;;
so it looks like it's a simple normalisation.
Joseph
