Editing Use a TrueType font
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A TrueType (or Openype) font can be used without going through a TFM or an OFM file, like in XeTeX. | A TrueType (or Openype) font can be used without going through a TFM or an OFM file, like in XeTeX. | ||
| − | + | The best way to do so is to use the package luaotfload, on the CTAN, and developped here: http://github.com/mpg/luaotfload/ | |
The code shows how we can use the table of a TrueType font to produce an internal TeX font table: | The code shows how we can use the table of a TrueType font to produce an internal TeX font table: | ||
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\pdfoutput1 | \pdfoutput1 | ||
\directlua{ | \directlua{ | ||
| − | callback.register( | + | callback.register('define_font', |
function(name, size) | function(name, size) | ||
| − | + | fonttype = nil | |
| − | + | filename = kpse.find_file(name,"opentype fonts") | |
| − | + | if (filename) | |
| − | + | then fonttype = 'opentype' | |
| + | else filename = kpse.find_file(name, "truetype fonts") | ||
| + | end | ||
| + | if filename and not fonttype then fonttype = 'truetype' end | ||
if fonttype then | if fonttype then | ||
| − | + | if (size < 0) then size = (- 655.36) * size end | |
| − | + | ttffont = fontforge.to_table(fontforge.open(filename)) | |
| − | |||
| − | |||
| − | ttffont = | ||
if ttffont then | if ttffont then | ||
f = { } | f = { } | ||
| Line 27: | Line 27: | ||
f.designsize = size | f.designsize = size | ||
f.size = size | f.size = size | ||
| − | + | direction = 0 | |
f.parameters.slant = 0 | f.parameters.slant = 0 | ||
f.parameters.space = size * 0.25 | f.parameters.space = size * 0.25 | ||
| Line 38: | Line 38: | ||
local mag = size / ttffont.units_per_em | local mag = size / ttffont.units_per_em | ||
| − | + | names_of_char = { } | |
| − | for char, glyph in pairs(ttffont.map.map) do | + | for char, glyph in pairs(ttffont.map.map) |
| − | names_of_char[ttffont.glyphs[glyph].name] = ttffont.map.backmap[glyph] | + | do |
| + | names_of_char[ttffont.glyphs[glyph].name] | ||
| + | = ttffont.map.backmap[glyph] | ||
end | end | ||
| − | + | for char, glyph in pairs(ttffont.map.map) | |
| − | + | do | |
| + | glyph_table = ttffont.glyphs[glyph] | ||
f.characters[char] = { | f.characters[char] = { | ||
index = glyph, | index = glyph, | ||
width = glyph_table.width * mag, | width = glyph_table.width * mag, | ||
| − | name = glyph_table.name } | + | name = glyph_table.name, |
| + | } | ||
if glyph_table.boundingbox[4] then | if glyph_table.boundingbox[4] then | ||
f.characters[char].height = glyph_table.boundingbox[4] * mag | f.characters[char].height = glyph_table.boundingbox[4] * mag | ||
| Line 59: | Line 63: | ||
if glyph_table.kerns then | if glyph_table.kerns then | ||
local kerns = { } | local kerns = { } | ||
| − | for _, kern in pairs(glyph_table.kerns) do | + | for _, kern in pairs(glyph_table.kerns) |
| + | do | ||
kerns[names_of_char[kern.char]] = kern.off * mag | kerns[names_of_char[kern.char]] = kern.off * mag | ||
end | end | ||
| − | + | f.characters[char].kerns = kerns | |
end | end | ||
end | end | ||
| − | |||
f.filename = filename | f.filename = filename | ||
| − | f.type = | + | f.type = 'real' |
f.format = fonttype | f.format = fonttype | ||
f.embedding = "subset" | f.embedding = "subset" | ||
| Line 74: | Line 78: | ||
ordering = "Identity", | ordering = "Identity", | ||
supplement = 0, | supplement = 0, | ||
| − | version = 1 } | + | version = 1 |
| + | } | ||
end | end | ||
else | else | ||
| Line 80: | Line 85: | ||
end | end | ||
return f | return f | ||
| − | end) | + | end |
| + | ) | ||
} | } | ||
</pre> | </pre> | ||
| Line 86: | Line 92: | ||
The index of the <tt>f.characters</tt> table is the Unicode value, among the properties of each entry of that table we have <tt>index</tt> which is the glyph index. Using this property we get the mapping between Unicode characters and glyphs. Kerning is handled via TeX font LKP. | The index of the <tt>f.characters</tt> table is the Unicode value, among the properties of each entry of that table we have <tt>index</tt> which is the glyph index. Using this property we get the mapping between Unicode characters and glyphs. Kerning is handled via TeX font LKP. | ||
| − | What is missing in the code above is better calculation of standard TeX font parameters and OpenType features. | + | What is missing in the code above is better calculation of standard TeX font parameters and OpenType features. � suivre... |
