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
|
if not modules then modules = { } end modules ['font-fbk'] = {
version = 1.001,
comment = "companion to font-ini.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files"
}
local cos, tan, rad, format = math.cos, math.tan, math.rad, string.format
local utfbyte, utfchar = utf.byte, utf.char
local trace_combining = false trackers.register("fonts.combining", function(v) trace_combining = v end)
local trace_combining_all = false trackers.register("fonts.combining.all", function(v) trace_combining_all = v end)
local force_combining = false -- just for demo purposes (see mk)
trackers.register("fonts.composing", "fonts.combining")
local report_combining = logs.reporter("fonts","combining")
local allocate = utilities.storage.allocate
--[[ldx--
<p>This is very experimental code!</p>
--ldx]]--
local fonts = fonts
local handlers = fonts.handlers
local constructors = fonts.constructors
local vf = handlers.vf
local commands = vf.combiner.commands
local otffeatures = constructors.newfeatures("otf")
local registerotffeature = otffeatures.register
local afmfeatures = constructors.newfeatures("afm")
local registerafmfeature = afmfeatures.register
local unicodecharacters = characters.data
local unicodefallbacks = characters.fallbacks
local push = vf.predefined.push
local pop = vf.predefined.pop
local force_composed = false
local cache = { } -- we could make these weak
local fraction = 0.15 -- 30 units for lucida
local function composecharacters(tfmdata)
-- this assumes that slot 1 is self, there will be a proper self some day
local characters = tfmdata.characters
local descriptions = tfmdata.descriptions
local parameters = tfmdata.parameters
local properties = tfmdata.properties
local Xdesc = descriptions[utfbyte("X")]
local xdesc = descriptions[utfbyte("x")]
if Xdesc and xdesc then
local scale = parameters.factor or 1
local deltaxheight = scale * (Xdesc.boundingbox[4] - xdesc.boundingbox[4])
local extraxheight = fraction * deltaxheight -- maybe use compose value
local italicfactor = parameters.italicfactor or 0
local vfspecials = backends.tables.vfspecials --brr
local red, green, blue, black
if trace_combining then
red = vfspecials.red
green = vfspecials.green
blue = vfspecials.blue
black = vfspecials.black
end
local compose = fonts.goodies.getcompositions(tfmdata)
if compose and trace_combining then
report_combining("using compose information from goodies file")
end
local done = false
for i,c in next, unicodecharacters do -- loop over all characters ... not that efficient but a specials hash takes memory
if force_combining or not characters[i] then
local s = c.specials
if s and s[1] == 'char' then
local chr = s[2]
local charschr = characters[chr]
if charschr then
local cc = c.category
if cc == 'll' or cc == 'lu' or cc == 'lt' then -- characters.is_letter[cc]
local acc = s[3]
local t = { }
for k, v in next, charschr do
if k ~= "commands" then
t[k] = v
end
end
local charsacc = characters[acc]
--~ local ca = charsacc.category
--~ if ca == "mn" then
--~ -- mark nonspacing
--~ elseif ca == "ms" then
--~ -- mark spacing combining
--~ elseif ca == "me" then
--~ -- mark enclosing
--~ else
if not charsacc then -- fallback accents
acc = unicodefallbacks[acc]
charsacc = acc and characters[acc]
end
local chr_t = cache[chr]
if not chr_t then
chr_t = {"slot", 1, chr}
cache[chr] = chr_t
end
if charsacc then
if trace_combining_all then
report_combining("%s (U+%05X) = %s (U+%05X) + %s (U+%05X)",utfchar(i),i,utfchar(chr),chr,utfchar(acc),acc)
end
local acc_t = cache[acc]
if not acc_t then
acc_t = {"slot", 1, acc}
cache[acc] = acc_t
end
local cb = descriptions[chr].boundingbox
local ab = descriptions[acc].boundingbox
-- todo: adapt height
if cb and ab then
-- can be sped up for scale == 1
local c_llx, c_lly, c_urx, c_ury = scale*cb[1], scale*cb[2], scale*cb[3], scale*cb[4]
local a_llx, a_lly, a_urx, a_ury = scale*ab[1], scale*ab[2], scale*ab[3], scale*ab[4]
local dx = (c_urx - a_urx - a_llx + c_llx)/2
local dd = (c_urx - c_llx)*italicfactor
if a_ury < 0 then
if trace_combining then
t.commands = { push, {"right", dx-dd}, red, acc_t, black, pop, chr_t }
else
t.commands = { push, {"right", dx-dd}, acc_t, pop, chr_t }
end
elseif c_ury > a_lly then -- messy test
local dy
if compose then
-- experimental: we could use sx but all that testing
-- takes time and code
dy = compose[i]
if dy then
dy = dy.DY
end
if not dy then
dy = compose[acc]
if dy then
dy = dy and dy.DY
end
end
if not dy then
dy = compose.DY
end
if not dy then
dy = - deltaxheight + extraxheight
elseif dy > -1.5 and dy < 1.5 then
-- we assume a fraction of (percentage)
dy = - dy * deltaxheight
else
-- we assume fontunits (value smaller than 2 make no sense)
dy = - dy * scale
end
else
dy = - deltaxheight + extraxheight
end
if trace_combining then
t.commands = { push, {"right", dx+dd}, {"down", dy}, green, acc_t, black, pop, chr_t }
else
t.commands = { push, {"right", dx+dd}, {"down", dy}, acc_t, pop, chr_t }
end
else
if trace_combining then
t.commands = { push, {"right", dx+dd}, blue, acc_t, black, pop, chr_t }
else
t.commands = { push, {"right", dx+dd}, acc_t, pop, chr_t }
end
end
else
t.commands = { chr_t } -- else index mess
end
else
if trace_combining_all then
report_combining("%s (U+%05X) = %s (U+%05X) (simplified)",utfchar(i),i,utfchar(chr),chr)
end
t.commands = { chr_t } -- else index mess
end
done = true
characters[i] = t
local d = { }
for k, v in next, descriptions[chr] do
d[k] = v
end
descriptions[i] = d
end
end
end
end
end
if done then
properties.virtualized = true
end
end
end
registerotffeature {
name = "compose",
description = "additional composed characters",
manipulators = {
base = composecharacters,
node = composecharacters,
}
}
registerafmfeature {
name = "compose",
description = "additional composed characters",
manipulators = {
base = composecharacters,
node = composecharacters,
}
}
vf.helpers.composecharacters = composecharacters
-- This installs the builder into the regular virtual font builder,
-- which only makes sense as demo.
commands["compose.trace.enable"] = function()
trace_combining = true
end
commands["compose.trace.disable"] = function()
trace_combining = false
end
commands["compose.force.enable"] = function()
force_combining = true
end
commands["compose.force.disable"] = function()
force_combining = false
end
commands["compose.trace.set"] = function(g,v)
if v[2] == nil then
trace_combining = true
else
trace_combining = v[2]
end
end
commands["compose.apply"] = function(g,v)
composecharacters(g)
end
-- vf builder
-- {'special', 'pdf: q ' .. s .. ' 0 0 '.. s .. ' 0 0 cm'},
-- {'special', 'pdf: q 1 0 0 1 ' .. -w .. ' ' .. -h .. ' cm'},
-- {'special', 'pdf: /Fm\XX\space Do'},
-- {'special', 'pdf: Q'},
-- {'special', 'pdf: Q'},
|
