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author | Hans Hagen <pragma@wxs.nl> | 2020-04-08 15:36:51 +0200 |
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committer | Context Git Mirror Bot <phg@phi-gamma.net> | 2020-04-08 15:36:51 +0200 |
commit | 9a1b9756939e12e328dea3633d9fe3cbde8f154b (patch) | |
tree | 22407c5d909d99866cb0cca7053288bd3d38d52b /doc/context/sources/general/manuals/luatex/luatex-enhancements.tex | |
parent | 8dcafbcc0fbdde27cf480584450516602daacd42 (diff) | |
download | context-9a1b9756939e12e328dea3633d9fe3cbde8f154b.tar.gz |
2020-04-08 14:37:00
Diffstat (limited to 'doc/context/sources/general/manuals/luatex/luatex-enhancements.tex')
-rw-r--r-- | doc/context/sources/general/manuals/luatex/luatex-enhancements.tex | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/doc/context/sources/general/manuals/luatex/luatex-enhancements.tex b/doc/context/sources/general/manuals/luatex/luatex-enhancements.tex index b81e1dbda..537961661 100644 --- a/doc/context/sources/general/manuals/luatex/luatex-enhancements.tex +++ b/doc/context/sources/general/manuals/luatex/luatex-enhancements.tex @@ -1266,6 +1266,29 @@ related primitives. \stopsubsection +\startsubsection[title={\prm {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 behaviour: 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 \startsection[title={Control and debugging}] |