summaryrefslogtreecommitdiff
path: root/Master/texmf-dist/tex/generic/context/luatex/luatex-fonts-ext.lua
blob: 7d9c58ccbfed65768b9064e70103b9b5b358acbb (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
if not modules then modules = { } end modules ['luatex-fonts-ext'] = {
    version   = 1.001,
    comment   = "companion to luatex-*.tex",
    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
    copyright = "PRAGMA ADE / ConTeXt Development Team",
    license   = "see context related readme files"
}

if context then
    texio.write_nl("fatal error: this module is not for context")
    os.exit()
end

local fonts       = fonts
local otffeatures = fonts.constructors.features.otf

-- A few generic extensions.

local function initializeitlc(tfmdata,value)
    if value then
        -- the magic 40 and it formula come from Dohyun Kim but we might need another guess
        local parameters = tfmdata.parameters
        local italicangle = parameters.italicangle
        if italicangle and italicangle ~= 0 then
            local properties = tfmdata.properties
            local factor = tonumber(value) or 1
            properties.hasitalics = true
            properties.autoitalicamount = factor * (parameters.uwidth or 40)/2
        end
    end
end

otffeatures.register {
    name        = "itlc",
    description = "italic correction",
    initializers = {
        base = initializeitlc,
        node = initializeitlc,
    }
}

-- slant and extend

local function initializeslant(tfmdata,value)
    value = tonumber(value)
    if not value then
        value =  0
    elseif value >  1 then
        value =  1
    elseif value < -1 then
        value = -1
    end
    tfmdata.parameters.slantfactor = value
end

otffeatures.register {
    name        = "slant",
    description = "slant glyphs",
    initializers = {
        base = initializeslant,
        node = initializeslant,
    }
}

local function initializeextend(tfmdata,value)
    value = tonumber(value)
    if not value then
        value =  0
    elseif value >  10 then
        value =  10
    elseif value < -10 then
        value = -10
    end
    tfmdata.parameters.extendfactor = value
end

otffeatures.register {
    name        = "extend",
    description = "scale glyphs horizontally",
    initializers = {
        base = initializeextend,
        node = initializeextend,
    }
}

-- expansion and protrusion

fonts.protrusions        = fonts.protrusions        or { }
fonts.protrusions.setups = fonts.protrusions.setups or { }

local setups = fonts.protrusions.setups

local function initializeprotrusion(tfmdata,value)
    if value then
        local setup = setups[value]
        if setup then
            local factor, left, right = setup.factor or 1, setup.left or 1, setup.right or 1
            local emwidth = tfmdata.parameters.quad
            tfmdata.parameters.protrusion = {
                auto = true,
            }
            for i, chr in next, tfmdata.characters do
                local v, pl, pr = setup[i], nil, nil
                if v then
                    pl, pr = v[1], v[2]
                end
                if pl and pl ~= 0 then chr.left_protruding  = left *pl*factor end
                if pr and pr ~= 0 then chr.right_protruding = right*pr*factor end
            end
        end
    end
end

otffeatures.register {
    name        = "protrusion",
    description = "shift characters into the left and or right margin",
    initializers = {
        base = initializeprotrusion,
        node = initializeprotrusion,
    }
}

fonts.expansions         = fonts.expansions        or { }
fonts.expansions.setups  = fonts.expansions.setups or { }

local setups = fonts.expansions.setups

local function initializeexpansion(tfmdata,value)
    if value then
        local setup = setups[value]
        if setup then
            local factor = setup.factor or 1
            tfmdata.parameters.expansion = {
                stretch = 10 * (setup.stretch or 0),
                shrink  = 10 * (setup.shrink  or 0),
                step    = 10 * (setup.step    or 0),
                auto    = true,
            }
            for i, chr in next, tfmdata.characters do
                local v = setup[i]
                if v and v ~= 0 then
                    chr.expansion_factor = v*factor
                else -- can be option
                    chr.expansion_factor = factor
                end
            end
        end
    end
end

otffeatures.register {
    name        = "expansion",
    description = "apply hz optimization",
    initializers = {
        base = initializeexpansion,
        node = initializeexpansion,
    }
}

-- left over

function fonts.loggers.onetimemessage() end

-- example vectors

local byte = string.byte

fonts.expansions.setups['default'] = {

    stretch = 2, shrink = 2, step = .5, factor = 1,

    [byte('A')] = 0.5, [byte('B')] = 0.7, [byte('C')] = 0.7, [byte('D')] = 0.5, [byte('E')] = 0.7,
    [byte('F')] = 0.7, [byte('G')] = 0.5, [byte('H')] = 0.7, [byte('K')] = 0.7, [byte('M')] = 0.7,
    [byte('N')] = 0.7, [byte('O')] = 0.5, [byte('P')] = 0.7, [byte('Q')] = 0.5, [byte('R')] = 0.7,
    [byte('S')] = 0.7, [byte('U')] = 0.7, [byte('W')] = 0.7, [byte('Z')] = 0.7,
    [byte('a')] = 0.7, [byte('b')] = 0.7, [byte('c')] = 0.7, [byte('d')] = 0.7, [byte('e')] = 0.7,
    [byte('g')] = 0.7, [byte('h')] = 0.7, [byte('k')] = 0.7, [byte('m')] = 0.7, [byte('n')] = 0.7,
    [byte('o')] = 0.7, [byte('p')] = 0.7, [byte('q')] = 0.7, [byte('s')] = 0.7, [byte('u')] = 0.7,
    [byte('w')] = 0.7, [byte('z')] = 0.7,
    [byte('2')] = 0.7, [byte('3')] = 0.7, [byte('6')] = 0.7, [byte('8')] = 0.7, [byte('9')] = 0.7,
}

fonts.protrusions.setups['default'] = {

    factor = 1, left = 1, right = 1,

    [0x002C] = { 0, 1    }, -- comma
    [0x002E] = { 0, 1    }, -- period
    [0x003A] = { 0, 1    }, -- colon
    [0x003B] = { 0, 1    }, -- semicolon
    [0x002D] = { 0, 1    }, -- hyphen
    [0x2013] = { 0, 0.50 }, -- endash
    [0x2014] = { 0, 0.33 }, -- emdash
    [0x3001] = { 0, 1    }, -- ideographic comma      、
    [0x3002] = { 0, 1    }, -- ideographic full stop  。
    [0x060C] = { 0, 1    }, -- arabic comma           ،
    [0x061B] = { 0, 1    }, -- arabic semicolon       ؛
    [0x06D4] = { 0, 1    }, -- arabic full stop       ۔

}

-- normalizer

fonts.handlers.otf.features.normalize = function(t)
    if t.rand then
        t.rand = "random"
    end
    return t
end

-- bonus

function fonts.helpers.nametoslot(name)
    local t = type(name)
    if t == "string" then
        local tfmdata = fonts.hashes.identifiers[currentfont()]
        local shared  = tfmdata and tfmdata.shared
        local fntdata = shared and shared.rawdata
        return fntdata and fntdata.resources.unicodes[name]
    elseif t == "number" then
        return n
    end
end

-- \font\test=file:somefont:reencode=mymessup
--
--  fonts.encodings.reencodings.mymessup = {
--      [109] = 110, -- m
--      [110] = 109, -- n
--  }

fonts.encodings             = fonts.encodings or { }
local reencodings           = { }
fonts.encodings.reencodings = reencodings

local function specialreencode(tfmdata,value)
    -- we forget about kerns as we assume symbols and we
    -- could issue a message if ther are kerns but it's
    -- a hack anyway so we odn't care too much here
    local encoding = value and reencodings[value]
    if encoding then
        local temp = { }
        local char = tfmdata.characters
        for k, v in next, encoding do
            temp[k] = char[v]
        end
        for k, v in next, temp do
            char[k] = temp[k]
        end
        -- if we use the font otherwise luatex gets confused so
        -- we return an additional hash component for fullname
        return string.format("reencoded:%s",value)
    end
end

local function reencode(tfmdata,value)
    tfmdata.postprocessors = tfmdata.postprocessors or { }
    table.insert(tfmdata.postprocessors,
        function(tfmdata)
            return specialreencode(tfmdata,value)
        end
    )
end

otffeatures.register {
    name         = "reencode",
    description  = "reencode characters",
    manipulators = {
        base = reencode,
        node = reencode,
    }
}

local function ignore(tfmdata,key,value)
    if value then
        tfmdata.mathparameters = nil
    end
end

otffeatures.register {
    name         = "ignoremathconstants",
    description  = "ignore math constants table",
    initializers = {
        base = ignore,
        node = ignore,
    }
}

local setmetatableindex = table.setmetatableindex

local function additalictowidth(tfmdata,key,value)
    local characters = tfmdata.characters
    local resources  = tfmdata.resources
    local additions  = { }
    local private    = resources.private
    for unicode, old_c in next, characters do
        -- maybe check for math
        local oldwidth  = old_c.width
        local olditalic = old_c.italic
        if olditalic and olditalic ~= 0 then
            private = private + 1
            local new_c = {
                width    = oldwidth + olditalic,
                height   = old_c.height,
                depth    = old_c.depth,
                commands = {
                    { "slot", 1, private },
                    { "right", olditalic },
                },
            }
            setmetatableindex(new_c,old_c)
            characters[unicode] = new_c
            additions[private]  = old_c
        end
    end
    for k, v in next, additions do
        characters[k] = v
    end
    resources.private = private
end

otffeatures.register {
    name        = "italicwidths",
    description = "add italic to width",
    manipulators = {
        base = additalictowidth,
     -- node = additalictowidth, -- only makes sense for math
    }
}