local font_metric_table = {}
aux.font_metric_table = font_metric_table
+local function is_harf(t)
+ return luaharfbuzz and package.loaded['harf'] and require("harf-base")
+end
+
local getfont = font.getfont
local provides_feature = luaotfload.aux.provides_feature
function aux.exist_feature(id, name)
local t = getfont(id)
if t and t.shared and t.shared.features then
t.shared.features[name] = true
- elseif t and t.hb then -- HARFLOAD
+ elseif t and is_harf(t) then -- HARFLOAD
local hb, tf = require("harf-base"), t.hb.spec.features
tf[#tf+1] = hb.Feature.new(name)
end
aux.get_cidinfo = get_cidinfo
end
+local function get_asc_des(id)
+ local t, v = getfont(id), font_metric_table[id]
+ local a, d
+ if t and t.shared then
+ local u = t.units
+ local t2 = t.shared.rawdata.metadata
+ if t2 then
+ a, d = t2.ascender and t2.ascender/u, t2.descender and -t2.descender/u
+ end
+ -- HARFLOAD h_extents() returns "too large" value...?
+ -- rawdata.metadata.horizontalmetrics is same
+ end
+ v.ascender, v.descender = (a or 0.88)*t.size, (d or 0.12)*t.size
+end
local function get_ascender(id) -- scaled points
- if font_metric_table[id].ascender then return font_metric_table[id].ascender end
- local t = getfont(id)
- local a = t and t.parameters and t.parameters.ascender or t.size*0.88
- font_metric_table[id].descender = a; return a
+ if not font_metric_table[id].ascender then get_asc_des(id) end
+ return font_metric_table[id].ascender
end
local function get_descender(id) -- scaled points
- if font_metric_table[id].descender then return font_metric_table[id].descender end
- local t = getfont(id)
- local a = t and t.parameters and t.parameters.descender or t.size*0.12
- font_metric_table[id].descender = a; return a
+ if not font_metric_table[id].descender then get_asc_des(id) end
+ return font_metric_table[id].descender
end
aux.get_ascender, aux.get_descender = get_ascender, get_descender