45 lines
1.5 KiB
Lua
45 lines
1.5 KiB
Lua
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require'luametalatex-font-resolve' -- Ensure that font.fonts exists
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local keymap = {}
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-- There are multiple criteria for sharing backend fonts:
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-- * Obviously encodingbytes have to be the same.
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-- * The filename better is the same too.
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-- * Similarly the index must be the same.
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-- * Specifically in the PK font case *without* fixed DPI,
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-- The size must be the same too.
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-- * For fontmap based fonts, compare the name field instead,
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-- of the normal filename, especially to capture encoding differences.
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-- An alternative might be to only take the encoding into account.
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-- This is also required for other fonts which might not be backed by
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-- traditional files
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local function build_sharekey(fontdir)
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local encodingbytes = assert(fontdir.encodingbytes)
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local key = string.format("%i:%s:", fontdir.encodingbytes, fontdir.format)
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if encodingbytes == 1 then
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if fontdir.format == "type3" then
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return string.format("%s%i:%s", key, fontdir.size, fontdir.name)
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end
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key = string.format("%s%s:", key, fontdir.encoding or '')
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end
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key = string.format("%s%i:%s", key, fontdir.subfont or 1, fontdir.filename)
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return key
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end
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local fonts = font.fonts
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local fontmap = setmetatable({}, {
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__index = function(t, fid)
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local key = build_sharekey(assert(fonts[fid]))
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local mapped = keymap[key]
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local share_parent = mapped and t[mapped] or fid
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t[fid] = share_parent
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return share_parent
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end,
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})
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function pdf.getfontname(fid)
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return fontmap[fid]
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end
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return fontmap
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