1 files changed, 58 insertions, 1 deletions
diff --git a/tex/generic/context/luatex/luatex-fonts-ext.lua b/tex/generic/context/luatex/luatex-fonts-ext.lua
index b60d04512..7d9c58ccb 100644
--- a/tex/generic/context/luatex/luatex-fonts-ext.lua
+++ b/tex/generic/context/luatex/luatex-fonts-ext.lua
@@ -12,7 +12,7 @@ if context then
 end
 
 local fonts       = fonts
-local otffeatures = fonts.constructors.newfeatures("otf")
+local otffeatures = fonts.constructors.features.otf
 
 -- A few generic extensions.
 
@@ -270,3 +270,60 @@ otffeatures.register {
         node = reencode,
     }
 }
+
+local function ignore(tfmdata,key,value)
+    if value then
+        tfmdata.mathparameters = nil
+    end
+end
+
+otffeatures.register {
+    name         = "ignoremathconstants",
+    description  = "ignore math constants table",
+    initializers = {
+        base = ignore,
+        node = ignore,
+    }
+}
+
+local setmetatableindex = table.setmetatableindex
+
+local function additalictowidth(tfmdata,key,value)
+    local characters = tfmdata.characters
+    local resources  = tfmdata.resources
+    local additions  = { }
+    local private    = resources.private
+    for unicode, old_c in next, characters do
+        -- maybe check for math
+        local oldwidth  = old_c.width
+        local olditalic = old_c.italic
+        if olditalic and olditalic ~= 0 then
+            private = private + 1
+            local new_c = {
+                width    = oldwidth + olditalic,
+                height   = old_c.height,
+                depth    = old_c.depth,
+                commands = {
+                    { "slot", 1, private },
+                    { "right", olditalic },
+                },
+            }
+            setmetatableindex(new_c,old_c)
+            characters[unicode] = new_c
+            additions[private]  = old_c
+        end
+    end
+    for k, v in next, additions do
+        characters[k] = v
+    end
+    resources.private = private
+end
+
+otffeatures.register {
+    name        = "italicwidths",
+    description = "add italic to width",
+    manipulators = {
+        base = additalictowidth,
+     -- node = additalictowidth, -- only makes sense for math
+    }
+}