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-rw-r--r--luaotfload.dtx17
1 files changed, 17 insertions, 0 deletions
diff --git a/luaotfload.dtx b/luaotfload.dtx
index 6c3dafd..0cb371e 100644
--- a/luaotfload.dtx
+++ b/luaotfload.dtx
@@ -678,6 +678,23 @@ local function def_font(...)
mc["FractionDelimiterDisplayStyleSize"] = 2.39 * size
fontdata.MathConstants = mc
+% \end{macrocode}
+%
+% \LuaTeX\ does not provide interface to accessing
+% \texttt{(Script)ScriptPercentScaleDown} math constants, so we emulate
+% \XeTeX\ behaviour by setting \cs{fontdimen10} and \cs{fontdimen11}.
+%
+% \begin{macrocode}
+ if mc["ScriptPercentScaleDown"] then
+ fontdata.parameters[10] = mc["ScriptPercentScaleDown"]
+ else -- resort to plain TeX default
+ fontdata.parameters[10] = 70
+ end
+ if mc["ScriptScriptPercentScaleDown"] then
+ fontdata.parameters[11] = mc["ScriptScriptPercentScaleDown"]
+ else -- resort to plain TeX default
+ fontdata.parameters[11] = 50
+ end
end
end