1if not modules then modules = { } end modules ['font-imp-quality'] = {
2 version = 1.001,
3 comment = "companion to font-ini.mkiv and hand-ini.mkiv",
4 author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
5 copyright = "PRAGMA ADE / ConTeXt Development Team",
6 license = "see context related readme files"
7}
8
9if not context then return end
10
11local next, type, tonumber = next, type, tonumber
12
13local fonts = fonts
14local utilities = utilities
15
16local handlers = fonts.handlers
17local otf = handlers.otf
18local afm = handlers.afm
19local registerotffeature = otf.features.register
20local registerafmfeature = afm.features.register
21
22local allocate = utilities.storage.allocate
23local getparameters = utilities.parsers.getparameters
24
25local implement = interfaces and interfaces.implement
26
27local trace_protrusion = false trackers.register("fonts.protrusion", function(v) trace_protrusion = v end)
28local trace_expansion = false trackers.register("fonts.expansion", function(v) trace_expansion = v end)
29
30local report_expansions = logs.reporter("fonts","expansions")
31local report_protrusions = logs.reporter("fonts","protrusions")
32
33
34
35
36
37local function get_class_and_vector(tfmdata,value,where)
38 local g_where = tfmdata.goodies and tfmdata.goodies[where]
39 local f_where = fonts[where]
40 local g_classes = g_where and g_where.classes
41 local f_classes = f_where and f_where.classes
42 local class = (g_classes and g_classes[value]) or (f_classes and f_classes[value])
43 if class then
44 local class_vector = class.vector
45 local g_vectors = g_where and g_where.vectors
46 local f_vectors = f_where and f_where.vectors
47 local vector = (g_vectors and g_vectors[class_vector]) or (f_vectors and f_vectors[class_vector])
48 return class, vector
49 end
50end
51
52
53
54
55
56local expansions = fonts.expansions or allocate()
57
58fonts.expansions = expansions
59
60local classes = expansions.classes or allocate()
61local vectors = expansions.vectors or allocate()
62
63expansions.classes = classes
64expansions.vectors = vectors
65
66classes.preset = {
67 stretch = 2,
68 shrink = 2,
69 step = .5,
70 factor = 1,
71}
72
73classes['quality'] = {
74 stretch = 2,
75 shrink = 2,
76 step = .5,
77 vector = 'default',
78 factor = 1,
79}
80
81vectors['default'] = {
82 [0x0041] = 0.5,
83 [0x0042] = 0.7,
84 [0x0043] = 0.7,
85 [0x0044] = 0.5,
86 [0x0045] = 0.7,
87 [0x0046] = 0.7,
88 [0x0047] = 0.5,
89 [0x0048] = 0.7,
90 [0x004B] = 0.7,
91 [0x004D] = 0.7,
92 [0x004E] = 0.7,
93 [0x004F] = 0.5,
94 [0x0050] = 0.7,
95 [0x0051] = 0.5,
96 [0x0052] = 0.7,
97 [0x0053] = 0.7,
98 [0x0055] = 0.7,
99 [0x0057] = 0.7,
100 [0x005A] = 0.7,
101 [0x0061] = 0.7,
102 [0x0062] = 0.7,
103 [0x0063] = 0.7,
104 [0x0064] = 0.7,
105 [0x0065] = 0.7,
106 [0x0067] = 0.7,
107 [0x0068] = 0.7,
108 [0x006B] = 0.7,
109 [0x006D] = 0.7,
110 [0x006E] = 0.7,
111 [0x006F] = 0.7,
112 [0x0070] = 0.7,
113 [0x0071] = 0.7,
114 [0x0073] = 0.7,
115 [0x0075] = 0.7,
116 [0x0077] = 0.7,
117 [0x007A] = 0.7,
118 [0x0032] = 0.7,
119 [0x0033] = 0.7,
120 [0x0036] = 0.7,
121 [0x0038] = 0.7,
122 [0x0039] = 0.7,
123}
124
125vectors['quality'] = vectors['default']
126
127
128
129
130local function initialize(tfmdata,value)
131 if value then
132 local class, vector = get_class_and_vector(tfmdata,value,"expansions")
133 if class then
134 if vector then
135 local stretch = class.stretch or 0
136 local shrink = class.shrink or 0
137 local step = class.step or 0
138 local factor = class.factor or 1
139 if trace_expansion then
140 report_expansions("setting class %a, vector %a, factor %a, stretch %a, shrink %a, step %a",
141 value,class.vector,factor,stretch,shrink,step)
142 end
143 tfmdata.parameters.expansion = {
144 stretch = 10 * stretch,
145 shrink = 10 * shrink,
146 step = 10 * step,
147 factor = factor,
148 class = class,
149 vector = vector,
150 }
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186
187 elseif trace_expansion then
188 report_expansions("unknown vector %a in class %a",class.vector,value)
189 end
190 elseif trace_expansion then
191 report_expansions("unknown class %a",value)
192 end
193 end
194end
195
196local specification = {
197 name = "expansion",
198 description = "apply hz optimization",
199 initializers = {
200 base = initialize,
201 node = initialize,
202 }
203}
204
205registerotffeature(specification)
206registerafmfeature(specification)
207
208fonts.goodies.register("expansions", function(...) return fonts.goodies.report("expansions", trace_expansion, ...) end)
209
210implement {
211 name = "setupfontexpansion",
212 arguments = "2 strings",
213 actions = function(class,settings) getparameters(classes,class,'preset',settings) end
214}
215
216
217
218classes.math = {
219 stretch = 2,
220 shrink = 2,
221 step = .5,
222 vector = 'math',
223 factor = 1,
224}
225
226vectors.math = {
227 [0x002B] = { 4, 0 },
228 [0x2212] = { 4, 0 },
229 [0x003C] = { 8, 0 },
230 [0x003D] = { 8, 0 },
231 [0x003E] = { 8, 0 },
232 [0x002F] = { 2, 0 },
233 [0x0028] = { 2, 0 },
234 [0x0029] = { 2, 0 },
235 [0x005B] = { 2, 0 },
236 [0x005D] = { 2, 0 },
237}
238
239local function initialize(tfmdata,value)
240 if value then
241 local class, vector = get_class_and_vector(tfmdata,value,"expansions")
242 if class then
243 if vector then
244 local stretch = class.stretch or 0
245 local shrink = class.shrink or 0
246 local step = class.step or 0
247 local factor = class.factor or 1
248 if trace_expansion then
249 report_expansions("setting class %a, vector %a, factor %a, stretch %a, shrink %a, step %a",
250 value,class.vector,factor,stretch,shrink,step)
251 end
252 tfmdata.parameters.expansion = {
253 stretch = 10 * stretch,
254 shrink = 10 * shrink,
255 step = 10 * step,
256 factor = factor,
257 }
258 local characters = tfmdata.characters
259 for u, v in next, vector do
260 local chr = characters[u]
261 if type(v) == "table" then
262 local e = v[1]
263 local c = v[2] or 0
264 if e ~= 0 then
265 chr.expansion = e*factor
266 end
267 if c ~= 0 then
268 chr.compression = c*factor
269 end
270 elseif v ~= 0 then
271 chr.expansion = v*factor
272 end
273 end
274 elseif trace_expansion then
275 report_expansions("unknown vector %a in class %a",class.vector,value)
276 end
277 elseif trace_expansion then
278 report_expansions("unknown class %a",value)
279 end
280 end
281end
282
283registerotffeature {
284 name = "mathexpansion",
285 description = "apply hz optimization to math",
286 initializers = {
287 base = initialize,
288 node = initialize,
289 }
290}
291
292
293
294
295
296fonts.protrusions = allocate()
297local protrusions = fonts.protrusions
298
299protrusions.classes = allocate()
300protrusions.vectors = allocate()
301
302local classes = protrusions.classes
303local vectors = protrusions.vectors
304
305
306
307classes.preset = {
308 factor = 1,
309 left = 1,
310 right = 1,
311}
312
313classes['pure'] = { vector = 'pure', factor = 1 }
314classes['punctuation'] = { vector = 'punctuation', factor = 1 }
315classes['alpha'] = { vector = 'alpha', factor = 1 }
316classes['quality'] = { vector = 'quality', factor = 1 }
317
318vectors['pure'] = {
319
320 [0x002C] = { 0, 1 },
321 [0x002E] = { 0, 1 },
322 [0x003A] = { 0, 1 },
323 [0x003B] = { 0, 1 },
324 [0x002D] = { 0, 1 },
325 [0x00AD] = { 0, 1 },
326 [0x2013] = { 0, 0.50 },
327 [0x2014] = { 0, 0.33 },
328 [0x3001] = { 0, 1 },
329 [0x3002] = { 0, 1 },
330 [0x060C] = { 0, 1 },
331 [0x061B] = { 0, 1 },
332 [0x06D4] = { 0, 1 },
333
334}
335
336vectors['punctuation'] = {
337
338 [0x003F] = { 0, 0.20 },
339 [0x00BF] = { 0.20, 0 },
340 [0x0021] = { 0, 0.20 },
341 [0x00A1] = { 0.20, 0, },
342 [0x0028] = { 0.05, 0 },
343 [0x0029] = { 0, 0.05 },
344 [0x005B] = { 0.05, 0 },
345 [0x005D] = { 0, 0.05 },
346 [0x002C] = { 0, 0.70 },
347 [0x002E] = { 0, 0.70 },
348 [0x003A] = { 0, 0.50 },
349 [0x003B] = { 0, 0.50 },
350 [0x002D] = { 0, 0.70 },
351 [0x00AD] = { 0, 0.70 },
352 [0x2013] = { 0, 0.30 },
353 [0x2014] = { 0, 0.20 },
354 [0x060C] = { 0, 0.70 },
355 [0x061B] = { 0, 0.50 },
356 [0x06D4] = { 0, 0.70 },
357 [0x061F] = { 0, 0.20 },
358
359
360
361 [0x2039] = { 0.70, 0.70 },
362 [0x203A] = { 0.70, 0.70 },
363 [0x00AB] = { 0.50, 0.50 },
364 [0x00BB] = { 0.50, 0.50 },
365
366 [0x2018] = { 0.70, 0.70 },
367 [0x2019] = { 0, 0.70 },
368 [0x201A] = { 0.70, 0 },
369 [0x201B] = { 0.70, 0 },
370 [0x201C] = { 0.50, 0.50 },
371 [0x201D] = { 0, 0.50 },
372 [0x201E] = { 0.50, 0 },
373 [0x201F] = { 0.50, 0 },
374
375}
376
377vectors['alpha'] = {
378
379 [0x0041] = { .05, .05 },
380 [0x0046] = { 0, .05 },
381 [0x004A] = { .05, 0 },
382 [0x004B] = { 0, .05 },
383 [0x004C] = { 0, .05 },
384 [0x0054] = { .05, .05 },
385 [0x0056] = { .05, .05 },
386 [0x0057] = { .05, .05 },
387 [0x0058] = { .05, .05 },
388 [0x0059] = { .05, .05 },
389
390 [0x006B] = { 0, .05 },
391 [0x0072] = { 0, .05 },
392 [0x0074] = { 0, .05 },
393 [0x0076] = { .05, .05 },
394 [0x0077] = { .05, .05 },
395 [0x0078] = { .05, .05 },
396 [0x0079] = { .05, .05 },
397
398}
399
400vectors['quality'] = table.merged(
401 vectors['punctuation'],
402 vectors['alpha']
403)
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552local function initialize(tfmdata,value)
553 if value then
554
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558
559 local class, vector = get_class_and_vector(tfmdata,value,"protrusions")
560 if class then
561 if vector then
562 local factor = class.factor or 1
563 local left = class.left or 1
564 local right = class.right or 1
565 if trace_protrusion then
566 report_protrusions("setting class %a, vector %a, factor %a, left %a, right %a",
567 value,class.vector,factor,left,right)
568 end
569 local data = characters.data
570 local lfactor = left * factor
571 local rfactor = right * factor
572 if trace_protrusion then
573 report_protrusions("left factor %0.3F, right factor %0.3F",lfactor,rfactor)
574 end
575 tfmdata.parameters.protrusion = {
576 factor = factor,
577 left = left,
578 right = right,
579 class = class,
580 vector = vector,
581 }
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623
624 elseif trace_protrusion then
625 report_protrusions("unknown vector %a in class %a",class.vector,value)
626 end
627 elseif trace_protrusion then
628 report_protrusions("unknown class %a",value)
629 end
630
631 end
632end
633
634local specification = {
635 name = "protrusion",
636 description = "l/r margin character protrusion",
637 initializers = {
638 base = initialize,
639 node = initialize,
640 }
641}
642
643registerotffeature(specification)
644registerafmfeature(specification)
645
646fonts.goodies.register("protrusions", function(...) return fonts.goodies.report("protrusions", trace_protrusion, ...) end)
647
648implement {
649 name = "setupfontprotrusion",
650 arguments = "2 strings",
651 actions = function(class,settings) getparameters(classes,class,'preset',settings) end
652}
653
654local function initialize(tfmdata,value)
655 local properties = tfmdata.properties
656 local parameters = tfmdata.parameters
657 if properties then
658 value = tonumber(value)
659 if value then
660 if value < 0 then
661 value = 0
662 elseif value > 10 then
663 report_expansions("threshold for %a @ %p limited to 10 pct",properties.fontname,parameters.size)
664 value = 10
665 end
666 if value > 5 then
667 report_expansions("threshold for %a @ %p exceeds 5 pct",properties.fontname,parameters.size)
668 end
669 end
670 properties.threshold = value or nil
671 end
672end
673
674local specification = {
675 name = "threshold",
676 description = "threshold for quality features",
677 initializers = {
678 base = initialize,
679 node = initialize,
680 }
681}
682
683registerotffeature(specification)
684registerafmfeature(specification)
685
686
687
688local function addquality(id)
689 local tfmdata = fonts.hashes.identifiers[id]
690 if tfmdata then
691 local expansion = tfmdata.parameters.expansion
692 if expansion then
693 local class = expansion.class
694 local vector = expansion.vector
695 if class and vector then
696 local stretch = class.stretch or 0
697 local shrink = class.shrink or 0
698 local step = class.step or 0
699 local factor = class.factor or 1
700 local data = characters and characters.data
701 for i, chr in next, tfmdata.characters do
702 local v = vector[i]
703 if data and not v then
704 local d = data[i]
705 if d then
706 local s = d.shcode
707 if not s then
708
709 elseif type(s) == "table" then
710 v = ((vector[s[1]] or 0) + (vector[s[#s]] or 0)) / 2
711 else
712 v = vector[s] or 0
713 end
714 end
715 end
716
717 if v then
718 if type(v) == "table" then
719 local e = v[1]
720 local c = v[2] or 0
721 if e ~= 0 then
722 chr.expansion = e * factor * 1000
723 end
724 if c ~= 0 then
725 chr.compression = c * factor * 1000
726 end
727 elseif v == 0 then
728
729 else
730 chr.expansion = v * factor * 1000
731 end
732 elseif factor ~= 1 then
733 chr.expansion = factor * 1000
734 end
735 end
736 end
737 end
738
739 local protrusion = tfmdata.parameters.protrusion
740 if protrusion then
741 local class = protrusion.class
742 local vector = protrusion.vector
743 if class and vector then
744 local factor = class.factor or 1
745 local left = class.left or 1
746 local right = class.right or 1
747 local data = characters.data
748 local lfactor = left * factor
749 local rfactor = right * factor
750 for i, chr in next, tfmdata.characters do
751 local v = vector[i]
752 local pl = nil
753 local pr = nil
754 if v then
755 pl = v[1]
756 pr = v[2]
757 else
758 local d = data[i]
759 if d then
760 local s = d.shcode
761 if not s then
762
763 elseif type(s) == "table" then
764 local vl = vector[s[1]]
765 local vr = vector[s[#s]]
766 if vl then pl = vl[1] end
767 if vr then pr = vr[2] end
768 else
769 v = vector[s]
770 if v then
771 pl = v[1]
772 pr = v[2]
773 end
774 end
775 end
776 end
777 if pl and pl ~= 0 then
778 pl = pl * lfactor * chr.width
779 if trace_protrusion then
780 report_protrusions("left -> %0.3F %C ",pl,i)
781 end
782 chr.leftprotrusion = pl
783 end
784 if pr and pr ~= 0 then
785 pr = pr * rfactor * chr.width
786 chr.rightprotrusion = pr
787 if trace_protrusion then
788 report_protrusions("right -> %0.3F %C",pr,i)
789 end
790 end
791 end
792 end
793 end
794
795 if expansion or protrusion then
796 font.addquality(id,tfmdata)
797 end
798 end
799end
800
801callback.register("quality_font",addquality)
802 |
