[latex3-commits] [git/LaTeX3-latex3-luaotfload] dev: Add aux.provides_axis (d94739c)

Marcel Fabian Krüger tex at 2krueger.de
Sat Oct 1 12:35:57 CEST 2022


Repository : https://github.com/latex3/luaotfload
On branch  : dev
Link       : https://github.com/latex3/luaotfload/commit/d94739c5c7864598430c8961793d9f6e4d9bb672

>---------------------------------------------------------------

commit d94739c5c7864598430c8961793d9f6e4d9bb672
Author: Marcel Fabian Krüger <tex at 2krueger.de>
Date:   Sat Oct 1 12:13:09 2022 +0200

    Add aux.provides_axis


>---------------------------------------------------------------

d94739c5c7864598430c8961793d9f6e4d9bb672
 src/luaotfload-auxiliary.lua | 56 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/src/luaotfload-auxiliary.lua b/src/luaotfload-auxiliary.lua
index 0c9551a..8130552 100644
--- a/src/luaotfload-auxiliary.lua
+++ b/src/luaotfload-auxiliary.lua
@@ -583,6 +583,62 @@ function aux.provides_language(font_id, asked_script, asked_language)
   end
 end
 
+--[[doc--
+A function to check if a font is a variabe font with a given axis.
+--doc]]--
+
+function aux.provides_axis(font_id, asked_axis)
+  if not font_id      or type (font_id)      ~= "number"
+  or not asked_axis or type (asked_axis) ~= "string"
+  then
+    logreport ("both", 0, "aux",
+               "invalid parameters to provides_axis(%s, %s)",
+               tostring (font_id), tostring (asked_axis))
+    return false
+  end
+  -- asked_axis = stringlower(asked_axis)
+  local tfmdata = identifiers[font_id]
+  if not tfmdata then
+    logreport ("log", 0, "aux", "no font with id %d", font_id)
+    return false
+  end
+  local hbface = get_hbface(tfmdata)
+  if hbface then
+    if not hbface:ot_var_has_data() then return false end
+
+    if #asked_axis <= 4 then
+      local tag = harf.Tag.new(asked_axis)
+      local info = hbface:ot_var_find_axis_info(tag)
+      if info then
+        return true -- TODO: More info?
+      end
+    end
+
+    asked_axis = stringlower(asked_axis)
+    local infos = hbface:ot_var_get_axis_infos()
+    for i=1, #infos do
+      local info = infos[i]
+      if hbface:get_name(info.name_id):lower() == asked_axis then
+        return true -- TODO: More info?
+      end
+    end
+  else
+    asked_axis = stringlower(asked_axis)
+    local resources = tfmdata.resources
+    local variabledata = resources and resources.variabledata
+    if not variabledata then return false end
+    local axes = variabledata.axis
+    if not axes then return false end -- Shouldn't happen
+    for i=1, #axes do
+      local axis = axes[i]
+      if axis.tag == asked_axis or axis.name == asked_axis then
+        return true -- TODO: More info?
+      end
+    end
+  end
+  return false
+end
+
 --[[doc--
 We strip the syntax elements from feature definitions (shouldn’t
 actually be there in the first place, but who cares ...)





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