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-rw-r--r--src/luaotfload-auxiliary.lua26
1 files changed, 16 insertions, 10 deletions
diff --git a/src/luaotfload-auxiliary.lua b/src/luaotfload-auxiliary.lua
index e544dd7..e482aba 100644
--- a/src/luaotfload-auxiliary.lua
+++ b/src/luaotfload-auxiliary.lua
@@ -100,17 +100,21 @@ luaotfload_callbacks [#luaotfload_callbacks + 1] = {
"patch_font", set_sscale_dimens, "set_sscale_dimens",
}
+local default_units = 1000
+
--- fontobj -> int
local lookup_units = function (fontdata)
- local metadata = fontdata.shared and fontdata.shared.rawdata.metadata
- if metadata and metadata.units then
- return metadata.units
- elseif fontdata.parameters and fontdata.parameters.units then
- return fontdata.parameters.units
- elseif fontdata.units then --- v1.x
- return fontdata.units
+ local units = fontdata.units
+ if units and units > 0 then return units end
+ local shared = fontdata.shared if not shared then return default_units end
+ local rawdata = shared.rawdata if not rawdata then return default_units end
+ local metadata = rawdata.metadata if not metadata then return default_units end
+ local capheight = metadata.capheight if not capheight then return default_units end
+ local units = metadata.units or fontdata.units
+ if not units or units == 0 then
+ return default_units
end
- return 1000
+ return units
end
--[[doc--
@@ -213,8 +217,9 @@ local query_ascender = function (fontdata)
local metadata = rawdata.metadata if not metadata then return false end
local ascender = parameters.ascender
or metadata.ascender if not ascender then return false end
- local units = metadata.units if units == 0 then return false end
local size = parameters.size if not size then return false end
+ local units = lookup_units (fontdata)
+ if not units or units == 0 then return false end
return ascender * size / units
end
@@ -224,8 +229,9 @@ local query_capheight = function (fontdata)
local rawdata = shared.rawdata if not rawdata then return false end
local metadata = rawdata.metadata if not metadata then return false end
local capheight = metadata.capheight if not capheight then return false end
- local units = metadata.units if units == 0 then return false end
local size = parameters.size if not size then return false end
+ local units = lookup_units (fontdata)
+ if not units or units == 0 then return false end
return capheight * size / units
end