From d9aa299de0f736f75f90b98ab284e5bc73515949 Mon Sep 17 00:00:00 2001 From: Hans Hagen Date: Thu, 26 Mar 2020 22:27:51 +0100 Subject: 2020-03-26 21:49:00 --- .../manuals/luametatex/luametatex-fonts.tex | 24 +++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) (limited to 'doc/context/sources/general/manuals/luametatex/luametatex-fonts.tex') diff --git a/doc/context/sources/general/manuals/luametatex/luametatex-fonts.tex b/doc/context/sources/general/manuals/luametatex/luametatex-fonts.tex index 917ebfeb8..7cea6f865 100644 --- a/doc/context/sources/general/manuals/luametatex/luametatex-fonts.tex +++ b/doc/context/sources/general/manuals/luametatex/luametatex-fonts.tex @@ -140,7 +140,6 @@ For example, here is the character \quote {f} (decimal 102) in the font \type } \stoptyping - Two very special string indexes can be used also: \type {left_boundary} is a virtual character whose ligatures and kerns are used to handle word boundary processing. \type {right_boundary} is similar but not actually used for anything @@ -589,6 +588,29 @@ font.current( i) % % \stopsubsection +\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 + +\stopsubsection + \stopsection \stopchapter -- cgit v1.2.3