2016-08-27 13:40:00

2 files changed, 17 insertions, 0 deletions

diff --git a/doc/context/sources/general/manuals/luatex/luatex-fonts.tex b/doc/context/sources/general/manuals/luatex/luatex-fonts.tex
index 90412ea81..221c0ce85 100644
--- a/doc/context/sources/general/manuals/luatex/luatex-fonts.tex
+++ b/doc/context/sources/general/manuals/luatex/luatex-fonts.tex
@@ -77,6 +77,8 @@ The top|-|level keys in the table are as follows:
 \NC nomath           \NC no  \NC no  \NC yes \NC boolean\NC This key allows a minor speedup for text fonts. If it
                                                             is present and true, then \LUATEX\ will not check the
                                                             character entries for math|-|specific keys. \NC \NR
+\NC oldmath          \NC no  \NC no  \NC yes \NC boolean\NC This key flags a font as representing an old school \TEX\
+                                                            math font and disables the \OPENTYPE\ code path. \NC \NR
 \NC slant            \NC no  \NC no  \NC yes \NC number \NC This has the same semantics as the \type {SlantFont}
                                                             operator in font map files. \NC \NR
 \NC extent           \NC no  \NC no  \NC yes \NC number \NC This has the same semantics as the \type {ExtendFont}
diff --git a/doc/context/sources/general/manuals/luatex/luatex-math.tex b/doc/context/sources/general/manuals/luatex/luatex-math.tex
index 91d2420f5..fe255de31 100644
--- a/doc/context/sources/general/manuals/luatex/luatex-math.tex
+++ b/doc/context/sources/general/manuals/luatex/luatex-math.tex
@@ -980,6 +980,21 @@ primitive \type {\mathoption} has been introduced (so that we don't end up with
 many new commands). The approach of options also permits us to see what effect a
 specific solution has.
 
+\subsubsection {\type {\mathoption old}}
+
+This option was introduced for testing purposes when the math engine got split
+code paths and it forces the engine to treat new fonts as old ones with respect
+to italic correction etc. There are no guarantees given with respect to the final
+result and unexpected side effects are not seens as bugs as they relate to font
+properties.
+
+\startbuffer
+\mathoption old 1
+\stopbuffer
+
+The \type {oldmath} boolean flag in the \LUA\ font table is the official way to
+force old treatment as it's bound to fonts.
+
 \subsubsection {\type {\mathoption noitaliccompensation}}
 
 This option compensates placement for characters with a built|-|in italic