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
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
|
if not modules then modules = { } end modules ['font-ext'] = {
version = 1.001,
comment = "companion to font-ini.mkiv and hand-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local utf = unicode.utf8
local next, type, byte = next, type, string.byte
local gmatch, concat = string.gmatch, table.concat
local utfchar = utf.char
local trace_protrusion = false trackers.register("fonts.protrusion", function(v) trace_protrusion = v end)
local trace_expansion = false trackers.register("fonts.expansion", function(v) trace_expansion = v end)
commands = commands or { }
--[[ldx--
<p>When we implement functions that deal with features, most of them
will depend of the font format. Here we define the few that are kind
of neutral.</p>
--ldx]]--
fonts.triggers = fonts.triggers or { }
fonts.initializers = fonts.initializers or { }
fonts.methods = fonts.methods or { }
fonts.initializers.common = fonts.initializers.common or { }
local initializers = fonts.initializers
local methods = fonts.methods
--[[ldx--
<p>This feature will remove inter-digit kerns.</p>
--ldx]]--
table.insert(fonts.triggers,"equaldigits")
function initializers.common.equaldigits(tfmdata,value)
if value then
local chr = tfmdata.characters
for i = utfbyte('0'), utfbyte('9') do
local c = chr[i]
if c then
c.kerns = nil
end
end
end
end
--[[ldx--
<p>This feature will give all glyphs an equal height and/or depth. Valid
values are <type>none</type>, <type>height</type>, <type>depth</type> and
<type>both</type>.</p>
--ldx]]--
table.insert(fonts.triggers,"lineheight")
function initializers.common.lineheight(tfmdata,value)
if value and type(value) == "string" then
if value == "none" then
for _,v in next, tfmdata.characters do
v.height, v.depth = 0, 0
end
else
local ascender, descender = tfmdata.ascender, tfmdata.descender
if ascender and descender then
local ht, dp = ascender or 0, descender or 0
if value == "height" then
dp = 0
elseif value == "depth" then
ht = 0
end
if ht > 0 then
if dp > 0 then
for _,v in next, tfmdata.characters do
v.height, v.depth = ht, dp
end
else
for _,v in next, tfmdata.characters do
v.height = ht
end
end
elseif dp > 0 then
for _,v in next, tfmdata.characters do
v.depth = dp
end
end
end
end
end
end
-- -- -- -- -- --
-- shared
-- -- -- -- -- --
local function get_class_and_vector(tfmdata,value,where) -- "expansions"
local g_where = tfmdata.goodies and tfmdata.goodies[where]
local f_where = fonts[where]
local g_classes = g_where and g_where.classes
local class = g_where and g_where[value] or f_where.classes[value]
if class then
local class_vector = class.vector
local g_vectors = g_where and g_where.vectors
local vector = g_vectors and g_vectors[class_vector] or f_where.vectors[class_vector]
return class, vector
end
end
-- -- -- -- -- --
-- expansion (hz)
-- -- -- -- -- --
fonts.expansions = fonts.expansions or { }
fonts.expansions.classes = fonts.expansions.classes or { }
fonts.expansions.vectors = fonts.expansions.vectors or { }
local expansions = fonts.expansions
local classes = fonts.expansions.classes
local vectors = fonts.expansions.vectors
-- beware, pdftex itself uses percentages * 10
classes.preset = { stretch = 2, shrink = 2, step = .5, factor = 1 }
function commands.setupfontexpansion(class,settings)
aux.getparameters(classes,class,'preset',settings)
end
classes['quality'] = {
stretch = 2, shrink = 2, step = .5, vector = 'default', factor = 1
}
vectors['default'] = {
[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,
}
vectors['quality'] = vectors['default'] -- metatable ?
--~ function table.locator(...)
--~ local k = { ... }
--~ return function(t)
--~ for i=1,#k do
--~ t = t[k[i]]
--~ if not k then
--~ return false
--~ end
--~ end
--~ return t
--~ end
--~ end
--~ local locate = table.locator { "goodies", "expansions" }
function initializers.common.expansion(tfmdata,value)
if value then
local class, vector = get_class_and_vector(tfmdata,value,"expansions")
if class then
if vector then
local stretch, shrink, step, factor = class.stretch or 0, class.shrink or 0, class.step or 0, class.factor or 1
if trace_expansion then
logs.report("fonts","set expansion class %s, vector: %s, factor: %s, stretch: %s, shrink: %s, step: %s",value,class_vector,factor,stretch,shrink,step)
end
tfmdata.stretch, tfmdata.shrink, tfmdata.step, tfmdata.auto_expand = stretch * 10, shrink * 10, step * 10, true
local data = characters and characters.data
for i, chr in next, tfmdata.characters do
local v = vector[i]
if data and not v then -- we could move the data test outside (needed for plain)
local d = data[i]
if d then
local s = d.shcode
if not s then
-- sorry
elseif type(s) == "table" then
v = ((vector[s[1]] or 0) + (vector[s[#s]] or 0)) / 2
else
v = vector[s] or 0
end
end
end
if v and v ~= 0 then
chr.expansion_factor = v*factor
else -- can be option
chr.expansion_factor = factor
end
end
elseif trace_expansion then
logs.report("fonts","unknown expansion vector '%s' in class '%s",class_vector,value)
end
elseif trace_expansion then
logs.report("fonts","unknown expansion class '%s'",value)
end
end
end
table.insert(fonts.manipulators,"expansion")
initializers.base.otf.expansion = initializers.common.expansion
initializers.node.otf.expansion = initializers.common.expansion
initializers.base.afm.expansion = initializers.common.expansion
initializers.node.afm.expansion = initializers.common.expansion
fonts.goodies.register("expansions", function(...) return fonts.goodies.report("expansions", trace_expansion, ...) end)
-- -- -- -- -- --
-- protrusion
-- -- -- -- -- --
fonts.protrusions = fonts.protrusions or { }
fonts.protrusions.classes = fonts.protrusions.classes or { }
fonts.protrusions.vectors = fonts.protrusions.vectors or { }
local protrusions = fonts.protrusions
local classes = fonts.protrusions.classes
local vectors = fonts.protrusions.vectors
-- the values need to be revisioned
classes.preset = { factor = 1, left = 1, right = 1 }
function commands.setupfontprotrusion(class,settings)
aux.getparameters(classes,class,'preset',settings)
end
classes['pure'] = {
vector = 'pure', factor = 1
}
classes['punctuation'] = {
vector = 'punctuation', factor = 1
}
classes['alpha'] = {
vector = 'alpha', factor = 1
}
classes['quality'] = {
vector = 'quality', factor = 1
}
vectors['pure'] = {
[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 ۔
}
vectors['punctuation'] = {
[0x003F] = { 0, 0.20 }, -- ?
[0x00BF] = { 0, 0.20 }, -- ¿
[0x0021] = { 0, 0.20 }, -- !
[0x00A1] = { 0, 0.20 }, -- ¡
[0x0028] = { 0.05, 0 }, -- (
[0x0029] = { 0, 0.05 }, -- )
[0x005B] = { 0.05, 0 }, -- [
[0x005D] = { 0, 0.05 }, -- ]
[0x002C] = { 0, 0.70 }, -- comma
[0x002E] = { 0, 0.70 }, -- period
[0x003A] = { 0, 0.50 }, -- colon
[0x003B] = { 0, 0.50 }, -- semicolon
[0x002D] = { 0, 0.70 }, -- hyphen
[0x2013] = { 0, 0.30 }, -- endash
[0x2014] = { 0, 0.20 }, -- emdash
[0x060C] = { 0, 0.70 }, -- arabic comma
[0x061B] = { 0, 0.50 }, -- arabic semicolon
[0x06D4] = { 0, 0.70 }, -- arabic full stop
[0x061F] = { 0, 0.20 }, -- ؟
-- todo: left and right quotes: .5 double, .7 single
[0x2039] = { 0.70, 0.70 }, -- left single guillemet ‹
[0x203A] = { 0.70, 0.70 }, -- right single guillemet ›
[0x00AB] = { 0.50, 0.50 }, -- left guillemet «
[0x00BB] = { 0.50, 0.50 }, -- right guillemet »
[0x2018] = { 0.70, 0.70 }, -- left single quotation mark ‘
[0x2019] = { 0, 0.70 }, -- right single quotation mark ’
[0x201A] = { 0.70, 0 }, -- single low-9 quotation mark ,
[0x201B] = { 0.70, 0 }, -- single high-reversed-9 quotation mark ‛
[0x201C] = { 0.50, 0.50 }, -- left double quotation mark “
[0x201D] = { 0, 0.50 }, -- right double quotation mark ”
[0x201E] = { 0.50, 0 }, -- double low-9 quotation mark „
[0x201F] = { 0.50, 0 }, -- double high-reversed-9 quotation mark ‟
}
vectors['alpha'] = {
[byte("A")] = { .05, .05 },
[byte("F")] = { 0, .05 },
[byte("J")] = { .05, 0 },
[byte("K")] = { 0, .05 },
[byte("L")] = { 0, .05 },
[byte("T")] = { .05, .05 },
[byte("V")] = { .05, .05 },
[byte("W")] = { .05, .05 },
[byte("X")] = { .05, .05 },
[byte("Y")] = { .05, .05 },
[byte("k")] = { 0, .05 },
[byte("r")] = { 0, .05 },
[byte("t")] = { 0, .05 },
[byte("v")] = { .05, .05 },
[byte("w")] = { .05, .05 },
[byte("x")] = { .05, .05 },
[byte("y")] = { .05, .05 },
}
vectors['quality'] = table.merge( {},
vectors['punctuation'],
vectors['alpha']
)
-- As this is experimental code, users should not depend on it. The
-- implications are still discussed on the ConTeXt Dev List and we're
-- not sure yet what exactly the spec is (the next code is tested with
-- a gyre font patched by / fea file made by Khaled Hosny). The double
-- trick should not be needed it proper hanging punctuation is used in
-- which case values < 1 can be used.
--
-- preferred (in context, usine vectors):
--
-- \definefontfeature[whatever][default][mode=node,protrusion=quality]
--
-- using lfbd and rtbd, with possibibility to enable only one side :
--
-- \definefontfeature[whocares][default][mode=node,protrusion=yes, opbd=yes,script=latn]
-- \definefontfeature[whocares][default][mode=node,protrusion=right,opbd=yes,script=latn]
--
-- idem, using multiplier
--
-- \definefontfeature[whocares][default][mode=node,protrusion=2,opbd=yes,script=latn]
-- \definefontfeature[whocares][default][mode=node,protrusion=double,opbd=yes,script=latn]
--
-- idem, using named feature file (less frozen):
--
-- \definefontfeature[whocares][default][mode=node,protrusion=2,opbd=yes,script=latn,featurefile=texgyrepagella-regularxx.fea]
classes['double'] = { -- for testing opbd
factor = 2, left = 1, right = 1,
}
local function map_opbd_onto_protrusion(tfmdata,value,opbd)
local characters, descriptions = tfmdata.characters, tfmdata.descriptions
local otfdata = tfmdata.shared.otfdata
local singles = otfdata.shared.featuredata.gpos_single
local script, language = tfmdata.script, tfmdata.language
local done, factor, left, right = false, 1, 1, 1
local class = classes[value]
if class then
factor = class.factor or 1
left = class.left or 1
right = class.right or 1
else
factor = tonumber(value) or 1
end
if opbd ~= "right" then
local validlookups, lookuplist = fonts.otf.collect_lookups(otfdata,"lfbd",script,language)
if validlookups then
for i=1,#lookuplist do
local lookup = lookuplist[i]
local data = singles[lookup]
if data then
if trace_protrusion then
logs.report("fonts","set left protrusion using lfbd lookup '%s'",lookup)
end
for k, v in next, data do
-- local p = - v[3] / descriptions[k].width-- or 1 ~= 0 too but the same
local p = - (v[1] / 1000) * factor * left
characters[k].left_protruding = p
if trace_protrusion then
logs.report("opbd","lfbd -> %s -> 0x%05X (%s) -> %0.03f (%s)",lookup,k,utfchar(k),p,concat(v," "))
end
end
done = true
end
end
end
end
if opbd ~= "left" then
local validlookups, lookuplist = fonts.otf.collect_lookups(otfdata,"rtbd",script,language)
if validlookups then
for i=1,#lookuplist do
local lookup = lookuplist[i]
local data = singles[lookup]
if data then
if trace_protrusion then
logs.report("fonts","set right protrusion using rtbd lookup '%s'",lookup)
end
for k, v in next, data do
-- local p = v[3] / descriptions[k].width -- or 3
local p = (v[1] / 1000) * factor * right
characters[k].right_protruding = p
if trace_protrusion then
logs.report("opbd","rtbd -> %s -> 0x%05X (%s) -> %0.03f (%s)",lookup,k,utfchar(k),p,concat(v," "))
end
end
end
done = true
end
end
end
tfmdata.auto_protrude = done
end
-- The opbd test is just there because it was discussed on the
-- context development list. However, the mentioned fxlbi.otf font
-- only has some kerns for digits. So, consider this feature not
-- supported till we have a proper test font.
function initializers.common.protrusion(tfmdata,value)
if value then
local opbd = tfmdata.shared.features.opbd
if opbd then
-- possible values: left right both yes no (experimental)
map_opbd_onto_protrusion(tfmdata,value,opbd)
else
local class, vector = get_class_and_vector(tfmdata,value,"protrusions")
if class then
if vector then
local factor = class.factor or 1
local left = class.left or 1
local right = class.right or 1
if trace_protrusion then
logs.report("fonts","set protrusion class %s, vector: %s, factor: %s, left: %s, right: %s",value,class_vector,factor,left,right)
end
local data = characters.data
local emwidth = tfmdata.parameters.quad
tfmdata.auto_protrude = true
for i, chr in next, tfmdata.characters do
local v, pl, pr = vector[i], nil, nil
if v then
pl, pr = v[1], v[2]
else
local d = data[i]
if d then
local s = d.shcode
if not s then
-- sorry
elseif type(s) == "table" then
local vl, vr = vector[s[1]], vector[s[#s]]
if vl then pl = vl[1] end
if vr then pr = vr[2] end
else
v = vector[s]
if v then
pl, pr = v[1], v[2]
end
end
end
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
elseif trace_protrusion then
logs.report("fonts","unknown protrusion vector '%s' in class '%s",class_vector,value)
end
elseif trace_protrusion then
logs.report("fonts","unknown protrusion class '%s'",value)
end
end
end
end
table.insert(fonts.manipulators,"protrusion")
initializers.base.otf.protrusion = initializers.common.protrusion
initializers.node.otf.protrusion = initializers.common.protrusion
initializers.base.afm.protrusion = initializers.common.protrusion
initializers.node.afm.protrusion = initializers.common.protrusion
fonts.goodies.register("protrusions", function(...) return fonts.goodies.report("protrusions", trace_protrusion, ...) end)
-- -- --
function initializers.common.nostackmath(tfmdata,value)
tfmdata.ignore_stack_math = value
end
table.insert(fonts.manipulators,"nostackmath")
initializers.base.otf.nostackmath = initializers.common.nostackmath
initializers.node.otf.nostackmath = initializers.common.nostackmath
table.insert(fonts.triggers,"itlc")
function initializers.common.itlc(tfmdata,value)
if value then
-- the magic 40 and it formula come from Dohyun Kim
local fontdata = tfmdata.shared.otfdata or tfmdata.shared.afmdata
local metadata = fontdata and fontdata.metadata
if metadata then
local italicangle = metadata.italicangle
if italicangle and italicangle ~= 0 then
local uwidth = (metadata.uwidth or 40)/2
for unicode, d in next, tfmdata.descriptions do
local it = d.boundingbox[3] - d.width + uwidth
if it ~= 0 then
d.italic = it
end
end
tfmdata.has_italic = true
end
end
end
end
initializers.base.otf.itlc = initializers.common.itlc
initializers.node.otf.itlc = initializers.common.itlc
initializers.base.afm.itlc = initializers.common.itlc
initializers.node.afm.itlc = initializers.common.itlc
-- slanting
table.insert(fonts.triggers,"slant")
function initializers.common.slant(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.slant_factor = value
end
initializers.base.otf.slant = initializers.common.slant
initializers.node.otf.slant = initializers.common.slant
initializers.base.afm.slant = initializers.common.slant
initializers.node.afm.slant = initializers.common.slant
table.insert(fonts.triggers,"extend")
function initializers.common.extend(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.extend_factor = value
end
initializers.base.otf.extend = initializers.common.extend
initializers.node.otf.extend = initializers.common.extend
initializers.base.afm.extend = initializers.common.extend
initializers.node.afm.extend = initializers.common.extend
-- historic stuff, move from font-ota
local delete_node = nodes.delete
local glyph = node.id("glyph")
local fontdata = fonts.ids
fonts.strippables = fonts.strippables or { -- just a placeholder
[0x200C] = true, -- zwnj
[0x200D] = true, -- zwj
}
local strippables = fonts.strippables
local function processformatters(head,font)
local how = fontdata[font].shared.features.formatters
if how == nil or how == "strip" then -- nil when forced
local current, done = head, false
while current do
if current.id == glyph and current.subtype<256 and current.font == font then
local char = current.char
if strippables[char] then
head, current = delete_node(head,current)
done = true
else
current = current.next
end
else
current = current.next
end
end
return head, done
else
return head, false
end
end
methods.node.otf.formatters = processformatters
methods.base.otf.formatters = processformatters
fonts.otf.tables.features['formatters'] = 'Hide Formatting Characters'
fonts.otf.features.register("formatters")
table.insert(fonts.manipulators,"formatters") -- at end
|