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
|
if not modules then modules = { } end modules ['font-mps'] = {
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 concat = table.concat
local formatters = string.formatters
-- QP0 [QP1] QP2 => CP0 [CP1 CP2] CP3
-- CP0 = QP0
-- CP3 = QP2
--
-- CP1 = QP0 + 2/3 *(QP1-QP0)
-- CP2 = QP2 + 2/3 *(QP1-QP2)
fonts = fonts or { }
local metapost = fonts.metapost or { }
fonts.metapost = metapost
local trace_skips = false trackers.register("metapost.outlines.skips",function(v) trace_skips = v end)
local f_moveto = formatters["(%.4F,%.4F)"]
local f_lineto = formatters["--(%.4F,%.4F)"]
local f_curveto = formatters["..controls(%.4F,%.4F)and(%.4F,%.4F)..(%.4F,%.4F)"]
local s_cycle = "--cycle"
local f_nofill = formatters["nofill %s;"]
local f_dofill = formatters["fill %s;"]
local f_draw_trace = formatters["drawpathonly %s;"]
local f_draw = formatters["draw %s;"]
local f_boundingbox = formatters["((%.4F,%.4F)--(%.4F,%.4F)--(%.4F,%.4F)--(%.4F,%.4F)--cycle)"]
local f_vertical = formatters["((%.4F,%.4F)--(%.4F,%.4F))"]
function metapost.boundingbox(d,factor)
local bounds = d.boundingbox
local factor = factor or 1
local llx = factor*bounds[1]
local lly = factor*bounds[2]
local urx = factor*bounds[3]
local ury = factor*bounds[4]
return f_boundingbox(llx,lly,urx,lly,urx,ury,llx,ury)
end
function metapost.widthline(d,factor)
local bounds = d.boundingbox
local factor = factor or 1
local lly = factor*bounds[2]
local ury = factor*bounds[4]
local width = factor*d.width
return f_vertical(width,lly,width,ury)
end
function metapost.zeroline(d,factor)
local bounds = d.boundingbox
local factor = factor or 1
local lly = factor*bounds[2]
local ury = factor*bounds[4]
return f_vertical(0,lly,0,ury)
end
function metapost.paths(d,xfactor,yfactor)
local sequence = d.sequence
local segments = d.segments
local list = { }
local path = { } -- recycled
local size = 0
local xfactor = xfactor or 1
local yfactor = yfactor or xfactor
if sequence then
local i = 1
local n = #sequence
while i < n do
local operator = sequence[i]
if operator == "m" then -- "moveto"
if size > 0 then
size = size + 1
path[size] = s_cycle
list[#list+1] = concat(path,"",1,size)
size = 1
else
size = size + 1
end
path[size] = f_moveto(xfactor*sequence[i+1],yfactor*sequence[i+2])
i = i + 3
elseif operator == "l" then -- "lineto"
size = size + 1
path[size] = f_lineto(xfactor*sequence[i+1],yfactor*sequence[i+2])
i = i + 3
elseif operator == "c" then -- "curveto"
size = size + 1
path[size] = f_curveto(xfactor*sequence[i+1],yfactor*sequence[i+2],xfactor*sequence[i+3],yfactor*sequence[i+4],xfactor*sequence[i+5],yfactor*sequence[i+6])
i = i + 7
elseif operator =="q" then -- "quadraticto"
size = size + 1
-- first is always a moveto
local l_x, l_y = xfactor*sequence[i-2], yfactor*sequence[i-1]
local m_x, m_y = xfactor*sequence[i+1], yfactor*sequence[i+2]
local r_x, r_y = xfactor*sequence[i+3], yfactor*sequence[i+4]
path[size] = f_curveto (
l_x + 2/3 * (m_x-l_x),
l_y + 2/3 * (m_y-l_y),
r_x + 2/3 * (m_x-r_x),
r_y + 2/3 * (m_y-r_y),
r_x, r_y
)
i = i + 5
else
-- weird
i = i + 1
end
end
elseif segments then
for i=1,#segments do
local segment = segments[i]
local operator = segment[#segment]
if operator == "m" then -- "moveto"
if size > 0 then
size = size + 1
path[size] = s_cycle
list[#list+1] = concat(path,"",1,size)
size = 1
else
size = size + 1
end
path[size] = f_moveto(xfactor*segment[1],yfactor*segment[2])
elseif operator == "l" then -- "lineto"
size = size + 1
path[size] = f_lineto(xfactor*segment[1],yfactor*segment[2])
elseif operator == "c" then -- "curveto"
size = size + 1
path[size] = f_curveto(xfactor*segment[1],yfactor*segment[2],xfactor*segment[3],yfactor*segment[4],xfactor*segment[5],yfactor*segment[6])
elseif operator =="q" then -- "quadraticto"
size = size + 1
-- first is always a moveto
local prev = segments[i-1]
local l_x, l_y = xfactor*prev[#prev-2], yfactor*prev[#prev-1]
local m_x, m_y = xfactor*segment[1], yfactor*segment[2]
local r_x, r_y = xfactor*segment[3], yfactor*segment[4]
path[size] = f_curveto (
l_x + 2/3 * (m_x-l_x),
l_y + 2/3 * (m_y-l_y),
r_x + 2/3 * (m_x-r_x),
r_y + 2/3 * (m_y-r_y),
r_x, r_y
)
else
-- weird
end
end
else
return
end
if size > 0 then
size = size + 1
path[size] = s_cycle
list[#list+1] = concat(path,"",1,size)
end
return list
end
function metapost.fill(paths)
local r = { }
local n = #paths
for i=1,n do
if i < n then
r[i] = f_nofill(paths[i])
else
r[i] = f_dofill(paths[i])
end
end
return concat(r)
end
function metapost.draw(paths,trace)
local r = { }
local n = #paths
for i=1,n do
if trace then
r[i] = f_draw_trace(paths[i])
else
r[i] = f_draw(paths[i])
end
end
return concat(r)
end
function metapost.maxbounds(data,index,factor)
local maxbounds = data.maxbounds
local factor = factor or 1
local glyphs = data.glyphs
local glyph = glyphs[index]
local boundingbox = glyph.boundingbox
local xmin, ymin, xmax, ymax
if not maxbounds then
xmin, ymin, xmax, ymax = 0, 0, 0, 0
for i=1,#glyphs do
local d = glyphs[i]
if d then
local b = d.boundingbox
if b then
if b[1] < xmin then xmin = b[1] end
if b[2] < ymin then ymin = b[2] end
if b[3] > xmax then xmax = b[3] end
if b[4] > ymax then ymax = b[4] end
end
end
end
maxbounds = { xmin, ymin, xmax, ymax }
data.maxbounds = maxbounds
else
xmin = maxbounds[1]
ymin = maxbounds[2]
xmax = maxbounds[3]
ymax = maxbounds[4]
end
local llx = boundingbox[1]
local lly = boundingbox[2]
local urx = boundingbox[3]
local ury = boundingbox[4]
local width = glyph.width
if llx > 0 then
llx = 0
end
if width > urx then
urx = width
end
return f_boundingbox(
factor*llx,factor*ymin,
factor*urx,factor*ymin,
factor*urx,factor*ymax,
factor*llx,factor*ymax
)
end
----- formatters = string.formatters
----- concat = table.concat
local nodecodes = nodes.nodecodes -- no nuts yet
local glyph_code = nodecodes.glyph
local disc_code = nodecodes.disc
local kern_code = nodecodes.kern
local glue_code = nodecodes.glue
local hlist_code = nodecodes.hlist
local vlist_code = nodecodes.vlist
local rule_code = nodecodes.rule
local penalty_code = nodecodes.penalty
local find_tail = nodes.tail
----- metapost = fonts.glyphs.metapost
local characters = fonts.hashes.characters
local quaddata = fonts.hashes.emwidths
local shapes = fonts.hashes.shapes
local topaths = metapost.paths
local f_code = formatters["mfun_do_outline_text_flush(%q,%i,%.4F,%.4F)(%,t);"]
local s_nothing = "(origin scaled 10)"
local f_trace_rule = formatters["draw rule(%6F,%6F,%6F) shifted (%6F,%6F) withcolor .5white;"]
local f_strut = formatters["strut(%6F,%6F);"]
local f_hrule = formatters["draw rule(%6F,%6F,%6F);"]
local f_vrule = formatters["draw rule(%6F,%6F,%6F) shifted (%6F,%6F);"]
local f_bounds = formatters["checkbounds(%6F,%6F,%6F,%6F);"]
local sc = 10
local fc = number.dimenfactors.bp * sc / 10
-- todo: make the next more efficient:
function metapost.output(kind,font,char,advance,shift,ex)
local character = characters[font][char]
if character then
local index = character.index
if index then
local shapedata = shapes[font]
local glyphs = shapedata.glyphs -- todo: subfonts fonts.shapes.indexed(font,sub)
if glyphs then
local glyf = glyphs[index]
if glyf then
local units = shapedata.units or 1000
local yfactor = sc/units
local xfactor = yfactor
local shift = shift or 0
local advance = advance or 0
local exfactor = ex or 0
local wfactor = 1
if exfactor ~= 0 then
wfactor = (1+(ex/units)/1000)
xfactor = xfactor * wfactor
end
local paths = topaths(glyf,xfactor,yfactor)
local code = f_code(kind,#paths,advance,shift,paths)
return code, character.width * fc * wfactor
end
end
end
end
return s_nothing, 10 * sc/1000
end
-- not ok yet: leftoffset in framed not handled well
local signal = -0x3FFFFFFF - 1
function fonts.metapost.boxtomp(n,kind)
local result = { }
local advance = 0 -- in bp
local distance = 0
local llx, lly, urx, ury = 0, 0, 0, 0
local boxtomp
local function horizontal(current,shift,glue_sign,glue_set,glue_order,ht,dp)
shift = shift or 0
while current do
local id = current.id
if id == glyph_code then
local code, width = metapost.output(kind,current.font,current.char,advance,-shift*fc,current.expansion_factor)
result[#result+1] = code
advance = advance + width
elseif id == disc_code then
local replace = current.replace
if replace then
horizontal(replace,shift,glue_sign,glue_set,glue_order,ht,dp)
end
elseif id == kern_code then
local kern = current.kern * fc
if trace_skips then
result[#result+1] = f_trace_rule(kern,0.8*ht*fc,0.8*dp*fc,advance,-shift*fc)
end
advance = advance + kern
elseif id == glue_code then
local width = current.width
if glue_sign == 1 then
if current.stretch_order == glue_order then
width = (width + current.stretch * glue_set) * fc
else
width = width * fc
end
elseif glue_sign == 2 then
if current.shrink_order == glue_order then
width = (width - current.shrink * glue_set) * fc
else
width = width * fc
end
else
width = width * fc
end
if trace_skips then
result[#result+1] = f_trace_rule(width,0.1*ht*fc,0.1*dp*fc,advance,-shift*fc)
end
advance = advance + width
elseif id == hlist_code then
local a = advance
boxtomp(current,shift+current.shift,current.glue_sign,current.glue_set,current.glue_order)
advance = a + current.width * fc
elseif id == vlist_code then
boxtomp(current) -- ,distance + shift,current.glue_set*current.glue_sign)
advance = advance + current.width * fc
elseif id == rule_code then
local wd = current.width
local ht = current.height
local dp = current.depth
if not (ht == signal or dp == signal or wd == signal) then
ht = ht - shift
dp = dp - shift
if wd == 0 then
result[#result+1] = f_strut(ht*fc,-dp*fc)
else
result[#result+1] = f_hrule(wd*fc,ht*fc,-dp*fc)
end
end
if wd ~= signal then
advance = advance + wd * fc
end
end
current = current.next
end
end
local function vertical(current,shift)
shift = shift or 0
current = find_tail(current) -- otherwise bad bbox
while current do
local id = current.id
if id == hlist_code then
distance = distance - current.depth
boxtomp(current,distance + shift,current.glue_set*current.glue_sign)
distance = distance - current.height
elseif id == vlist_code then
print("vertical >>>")
vertical(current.list,0)
elseif id == kern_code then
distance = distance - current.kern
advance = 0
elseif id == glue_code then
distance = distance - current.width
advance = 0
elseif id == rule_code then
local wd = current.width
local ht = current.height
local dp = current.depth
if not (ht == signal or dp == signal or wd == signal) then
distance = distance - dp
if wd == 0 then
result[#result+1] = f_strut(ht*fc,-dp*fc)
else
result[#result+1] = f_vrule(wd*fc,ht*fc,-dp*fc,0,distance+shift)
end
distance = distance - ht
end
end
current = current.prev
end
end
boxtomp = function(list,shift)
local current = list.list
if current then
if list.id == hlist_code then
horizontal(current,shift,list.glue_sign,list.glue_set,list.glue_order,list.height,list.depth)
else
vertical(current,shift)
end
end
end
local box = tex.box[n]
boxtomp(box,box.shift,box.glue_sign,box.glue_set,box.glue_order)
local wd = box.width
local ht = box.height
local dp = box.depth
local sh = box.shift
result[#result+1] = f_bounds(0,-dp*fc,wd*fc,ht*fc)
return concat(result)
end
|