From 9a1b9756939e12e328dea3633d9fe3cbde8f154b Mon Sep 17 00:00:00 2001 From: Hans Hagen Date: Wed, 8 Apr 2020 15:36:51 +0200 Subject: 2020-04-08 14:37:00 --- .../sources/general/manuals/luatex/luatex-fonts.tex | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'doc/context/sources/general/manuals/luatex/luatex-fonts.tex') diff --git a/doc/context/sources/general/manuals/luatex/luatex-fonts.tex b/doc/context/sources/general/manuals/luatex/luatex-fonts.tex index 400550a96..e944b2c5b 100644 --- a/doc/context/sources/general/manuals/luatex/luatex-fonts.tex +++ b/doc/context/sources/general/manuals/luatex/luatex-fonts.tex @@ -861,6 +861,27 @@ value is the index in \type {font.fonts}, the second the font itself, as a \LUA\ table. The indices are listed incrementally, but they do not always form an array of consecutive numbers: in some cases there can be holes in the sequence. +\startsubsection[title={\type{\glyphdimensionsmode}}] + +Already in the early days of \LUATEX\ the decision was made to calculate the +effective height and depth of glyphs in a way that reflected the applied vertical +offset. The height got that offset added, the depth only when the offset was +larger than zero. We can now control this in more detail with this mode +parameter. An offset is added to the height and|/|or subtracted from the depth. +The effective values are never negative. The zero mode is the default. + +\starttabulate[|l|pl|] +\DB value \BC effect \NC\NR +\TB +\NC \type {0} \NC the old behavior: add the offset to the height and only subtract + the offset only from the depth when it is positive \NC \NR +\NC \type {1} \NC add the offset to the height and subtract it from the depth \NC \NR +\NC \type {2} \NC add the offset to the height and subtract it from the depth but + keep the maxima of the current and previous results \NC \NR +\NC \type {3} \NC use the height and depth of the glyph, so no offset is applied \NC \NR +\LL +\stoptabulate + \stopsection \stopchapter -- cgit v1.2.3