/usr/lib/python3/dist-packages/fontTools/varLib/merger.py is in python3-fonttools 3.21.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 | """
Merge OpenType Layout tables (GDEF / GPOS / GSUB).
"""
from __future__ import print_function, division, absolute_import
from fontTools.misc.py23 import *
from fontTools.misc import classifyTools
from fontTools.ttLib.tables import otTables as ot
from fontTools.ttLib.tables import otBase as otBase
from fontTools.ttLib.tables.DefaultTable import DefaultTable
from fontTools.varLib import builder, varStore
from fontTools.varLib.varStore import VarStoreInstancer
from functools import reduce
class Merger(object):
def __init__(self, font=None):
self.font = font
@classmethod
def merger(celf, clazzes, attrs=(None,)):
assert celf != Merger, 'Subclass Merger instead.'
if 'mergers' not in celf.__dict__:
celf.mergers = {}
if type(clazzes) == type:
clazzes = (clazzes,)
if type(attrs) == str:
attrs = (attrs,)
def wrapper(method):
assert method.__name__ == 'merge'
done = []
for clazz in clazzes:
if clazz in done: continue # Support multiple names of a clazz
done.append(clazz)
mergers = celf.mergers.setdefault(clazz, {})
for attr in attrs:
assert attr not in mergers, \
"Oops, class '%s' has merge function for '%s' defined already." % (clazz.__name__, attr)
mergers[attr] = method
return None
return wrapper
@classmethod
def mergersFor(celf, thing, _default={}):
typ = type(thing)
for celf in celf.mro():
mergers = getattr(celf, 'mergers', None)
if mergers is None:
break;
m = celf.mergers.get(typ, None)
if m is not None:
return m
return _default
def mergeObjects(self, out, lst, exclude=()):
keys = sorted(vars(out).keys())
assert all(keys == sorted(vars(v).keys()) for v in lst), \
(keys, [sorted(vars(v).keys()) for v in lst])
mergers = self.mergersFor(out)
defaultMerger = mergers.get('*', self.__class__.mergeThings)
try:
for key in keys:
if key in exclude: continue
value = getattr(out, key)
values = [getattr(table, key) for table in lst]
mergerFunc = mergers.get(key, defaultMerger)
mergerFunc(self, value, values)
except Exception as e:
e.args = e.args + ('.'+key,)
raise
def mergeLists(self, out, lst):
count = len(out)
assert all(count == len(v) for v in lst), (count, [len(v) for v in lst])
for i,(value,values) in enumerate(zip(out, zip(*lst))):
try:
self.mergeThings(value, values)
except Exception as e:
e.args = e.args + ('[%d]' % i,)
raise
def mergeThings(self, out, lst):
clazz = type(out)
try:
assert all(type(item) == clazz for item in lst), (out, lst)
mergerFunc = self.mergersFor(out).get(None, None)
if mergerFunc is not None:
mergerFunc(self, out, lst)
elif hasattr(out, '__dict__'):
self.mergeObjects(out, lst)
elif isinstance(out, list):
self.mergeLists(out, lst)
else:
assert all(out == v for v in lst), (out, lst)
except Exception as e:
e.args = e.args + (clazz.__name__,)
raise
def mergeTables(self, font, master_ttfs, tables):
for tag in tables:
if tag not in font: continue
self.mergeThings(font[tag], [m[tag] for m in master_ttfs])
#
# Aligning merger
#
class AligningMerger(Merger):
pass
def _SinglePosUpgradeToFormat2(self):
if self.Format == 2: return self
ret = ot.SinglePos()
ret.Format = 2
ret.Coverage = self.Coverage
ret.ValueFormat = self.ValueFormat
ret.Value = [self.Value for g in ret.Coverage.glyphs]
ret.ValueCount = len(ret.Value)
return ret
def _merge_GlyphOrders(font, lst, values_lst=None, default=None):
"""Takes font and list of glyph lists (must be sorted by glyph id), and returns
two things:
- Combined glyph list,
- If values_lst is None, return input glyph lists, but padded with None when a glyph
was missing in a list. Otherwise, return values_lst list-of-list, padded with None
to match combined glyph lists.
"""
if values_lst is None:
dict_sets = [set(l) for l in lst]
else:
dict_sets = [{g:v for g,v in zip(l,vs)} for l,vs in zip(lst,values_lst)]
combined = set()
combined.update(*dict_sets)
sortKey = font.getReverseGlyphMap().__getitem__
order = sorted(combined, key=sortKey)
# Make sure all input glyphsets were in proper order
assert all(sorted(vs, key=sortKey) == vs for vs in lst)
del combined
paddedValues = None
if values_lst is None:
padded = [[glyph if glyph in dict_set else default
for glyph in order]
for dict_set in dict_sets]
else:
assert len(lst) == len(values_lst)
padded = [[dict_set[glyph] if glyph in dict_set else default
for glyph in order]
for dict_set in dict_sets]
return order, padded
def _Lookup_SinglePos_get_effective_value(subtables, glyph):
for self in subtables:
if self is None or \
type(self) != ot.SinglePos or \
self.Coverage is None or \
glyph not in self.Coverage.glyphs:
continue
if self.Format == 1:
return self.Value
elif self.Format == 2:
return self.Value[self.Coverage.glyphs.index(glyph)]
else:
assert 0
return None
def _Lookup_PairPos_get_effective_value_pair(subtables, firstGlyph, secondGlyph):
for self in subtables:
if self is None or \
type(self) != ot.PairPos or \
self.Coverage is None or \
firstGlyph not in self.Coverage.glyphs:
continue
if self.Format == 1:
ps = self.PairSet[self.Coverage.glyphs.index(firstGlyph)]
pvr = ps.PairValueRecord
for rec in pvr: # TODO Speed up
if rec.SecondGlyph == secondGlyph:
return rec
continue
elif self.Format == 2:
klass1 = self.ClassDef1.classDefs.get(firstGlyph, 0)
klass2 = self.ClassDef2.classDefs.get(secondGlyph, 0)
return self.Class1Record[klass1].Class2Record[klass2]
else:
assert 0
return None
@AligningMerger.merger(ot.SinglePos)
def merge(merger, self, lst):
self.ValueFormat = valueFormat = reduce(int.__or__, [l.ValueFormat for l in lst], 0)
assert len(lst) == 1 or (valueFormat & ~0xF == 0), valueFormat
# If all have same coverage table and all are format 1,
if all(v.Format == 1 for v in lst) and all(self.Coverage.glyphs == v.Coverage.glyphs for v in lst):
self.Value = otBase.ValueRecord(valueFormat)
merger.mergeThings(self.Value, [v.Value for v in lst])
self.ValueFormat = self.Value.getFormat()
return
# Upgrade everything to Format=2
self.Format = 2
lst = [_SinglePosUpgradeToFormat2(v) for v in lst]
# Align them
glyphs, padded = _merge_GlyphOrders(merger.font,
[v.Coverage.glyphs for v in lst],
[v.Value for v in lst])
self.Coverage.glyphs = glyphs
self.Value = [otBase.ValueRecord(valueFormat) for g in glyphs]
self.ValueCount = len(self.Value)
for i,values in enumerate(padded):
for j,glyph in enumerate(glyphs):
if values[j] is not None: continue
# Fill in value from other subtables
# Note!!! This *might* result in behavior change if ValueFormat2-zeroedness
# is different between used subtable and current subtable!
# TODO(behdad) Check and warn if that happens?
v = _Lookup_SinglePos_get_effective_value(merger.lookup_subtables[i], glyph)
if v is None:
v = otBase.ValueRecord(valueFormat)
values[j] = v
merger.mergeLists(self.Value, padded)
# Merge everything else; though, there shouldn't be anything else. :)
merger.mergeObjects(self, lst,
exclude=('Format', 'Coverage', 'Value', 'ValueCount'))
self.ValueFormat = reduce(int.__or__, [v.getFormat() for v in self.Value], 0)
@AligningMerger.merger(ot.PairSet)
def merge(merger, self, lst):
# Align them
glyphs, padded = _merge_GlyphOrders(merger.font,
[[v.SecondGlyph for v in vs.PairValueRecord] for vs in lst],
[vs.PairValueRecord for vs in lst])
self.PairValueRecord = pvrs = []
for glyph in glyphs:
pvr = ot.PairValueRecord()
pvr.SecondGlyph = glyph
pvr.Value1 = otBase.ValueRecord(merger.valueFormat1) if merger.valueFormat1 else None
pvr.Value2 = otBase.ValueRecord(merger.valueFormat2) if merger.valueFormat2 else None
pvrs.append(pvr)
self.PairValueCount = len(self.PairValueRecord)
for i,values in enumerate(padded):
for j,glyph in enumerate(glyphs):
# Fill in value from other subtables
v = ot.PairValueRecord()
v.SecondGlyph = glyph
if values[j] is not None:
vpair = values[j]
else:
vpair = _Lookup_PairPos_get_effective_value_pair(merger.lookup_subtables[i], self._firstGlyph, glyph)
if vpair is None:
v1, v2 = None, None
else:
v1, v2 = vpair.Value1, vpair.Value2
v.Value1 = otBase.ValueRecord(merger.valueFormat1, src=v1) if merger.valueFormat1 else None
v.Value2 = otBase.ValueRecord(merger.valueFormat2, src=v2) if merger.valueFormat2 else None
values[j] = v
del self._firstGlyph
merger.mergeLists(self.PairValueRecord, padded)
def _PairPosFormat1_merge(self, lst, merger):
assert _all_equal([l.ValueFormat2 == 0 for l in lst if l.PairSet]), "Report bug against fonttools."
# Merge everything else; makes sure Format is the same.
merger.mergeObjects(self, lst,
exclude=('Coverage',
'PairSet', 'PairSetCount',
'ValueFormat1', 'ValueFormat2'))
empty = ot.PairSet()
empty.PairValueRecord = []
empty.PairValueCount = 0
# Align them
glyphs, padded = _merge_GlyphOrders(merger.font,
[v.Coverage.glyphs for v in lst],
[v.PairSet for v in lst],
default=empty)
self.Coverage.glyphs = glyphs
self.PairSet = [ot.PairSet() for g in glyphs]
self.PairSetCount = len(self.PairSet)
for glyph, ps in zip(glyphs, self.PairSet):
ps._firstGlyph = glyph
merger.mergeLists(self.PairSet, padded)
def _ClassDef_invert(self, allGlyphs=None):
if isinstance(self, dict):
classDefs = self
else:
classDefs = self.classDefs if self and self.classDefs else {}
m = max(classDefs.values()) if classDefs else 0
ret = []
for _ in range(m + 1):
ret.append(set())
for k,v in classDefs.items():
ret[v].add(k)
# Class-0 is special. It's "everything else".
if allGlyphs is None:
ret[0] = None
else:
# Limit all classes to glyphs in allGlyphs.
# Collect anything without a non-zero class into class=zero.
ret[0] = class0 = set(allGlyphs)
for s in ret[1:]:
s.intersection_update(class0)
class0.difference_update(s)
return ret
def _ClassDef_merge_classify(lst, allGlyphs=None):
self = ot.ClassDef()
self.classDefs = classDefs = {}
classifier = classifyTools.Classifier()
for l in lst:
sets = _ClassDef_invert(l, allGlyphs=allGlyphs)
if allGlyphs is None:
sets = sets[1:]
classifier.update(sets)
classes = classifier.getClasses()
if allGlyphs is None:
classes.insert(0, set())
for i,classSet in enumerate(classes):
if i == 0:
continue
for g in classSet:
classDefs[g] = i
return self, classes
def _ClassDef_calculate_Format(self, font):
fmt = 2
ranges = self._getClassRanges(font)
if ranges:
startGlyph = ranges[0][1]
endGlyph = ranges[-1][3]
glyphCount = endGlyph - startGlyph + 1
if len(ranges) * 3 >= glyphCount + 1:
# Format 1 is more compact
fmt = 1
self.Format = fmt
def _PairPosFormat2_align_matrices(self, lst, font, transparent=False):
matrices = [l.Class1Record for l in lst]
# Align first classes
self.ClassDef1, classes = _ClassDef_merge_classify([l.ClassDef1 for l in lst], allGlyphs=set(self.Coverage.glyphs))
_ClassDef_calculate_Format(self.ClassDef1, font)
self.Class1Count = len(classes)
new_matrices = []
for l,matrix in zip(lst, matrices):
nullRow = None
coverage = set(l.Coverage.glyphs)
classDef1 = l.ClassDef1.classDefs
class1Records = []
for classSet in classes:
exemplarGlyph = next(iter(classSet))
if exemplarGlyph not in coverage:
if nullRow is None:
nullRow = ot.Class1Record()
class2records = nullRow.Class2Record = []
# TODO: When merger becomes selfless, revert e6125b353e1f54a0280ded5434b8e40d042de69f
for _ in range(l.Class2Count):
if transparent:
rec2 = None
else:
rec2 = ot.Class2Record()
rec2.Value1 = otBase.ValueRecord(self.ValueFormat1) if self.ValueFormat1 else None
rec2.Value2 = otBase.ValueRecord(self.ValueFormat2) if self.ValueFormat2 else None
class2records.append(rec2)
rec1 = nullRow
else:
klass = classDef1.get(exemplarGlyph, 0)
rec1 = matrix[klass] # TODO handle out-of-range?
class1Records.append(rec1)
new_matrices.append(class1Records)
matrices = new_matrices
del new_matrices
# Align second classes
self.ClassDef2, classes = _ClassDef_merge_classify([l.ClassDef2 for l in lst])
_ClassDef_calculate_Format(self.ClassDef2, font)
self.Class2Count = len(classes)
new_matrices = []
for l,matrix in zip(lst, matrices):
classDef2 = l.ClassDef2.classDefs
class1Records = []
for rec1old in matrix:
oldClass2Records = rec1old.Class2Record
rec1new = ot.Class1Record()
class2Records = rec1new.Class2Record = []
for classSet in classes:
if not classSet: # class=0
rec2 = oldClass2Records[0]
else:
exemplarGlyph = next(iter(classSet))
klass = classDef2.get(exemplarGlyph, 0)
rec2 = oldClass2Records[klass]
class2Records.append(rec2)
class1Records.append(rec1new)
new_matrices.append(class1Records)
matrices = new_matrices
del new_matrices
return matrices
def _PairPosFormat2_merge(self, lst, merger):
assert _all_equal([l.ValueFormat2 == 0 for l in lst if l.Class1Record]), "Report bug against fonttools."
merger.mergeObjects(self, lst,
exclude=('Coverage',
'ClassDef1', 'Class1Count',
'ClassDef2', 'Class2Count',
'Class1Record',
'ValueFormat1', 'ValueFormat2'))
# Align coverages
glyphs, _ = _merge_GlyphOrders(merger.font,
[v.Coverage.glyphs for v in lst])
self.Coverage.glyphs = glyphs
# Currently, if the coverage of PairPosFormat2 subtables are different,
# we do NOT bother walking down the subtable list when filling in new
# rows for alignment. As such, this is only correct if current subtable
# is the last subtable in the lookup. Ensure that.
#
# Note that our canonicalization process merges trailing PairPosFormat2's,
# so in reality this is rare.
for l,subtables in zip(lst,merger.lookup_subtables):
if l.Coverage.glyphs != glyphs:
assert l == subtables[-1]
matrices = _PairPosFormat2_align_matrices(self, lst, merger.font)
self.Class1Record = list(matrices[0]) # TODO move merger to be selfless
merger.mergeLists(self.Class1Record, matrices)
@AligningMerger.merger(ot.PairPos)
def merge(merger, self, lst):
merger.valueFormat1 = self.ValueFormat1 = reduce(int.__or__, [l.ValueFormat1 for l in lst], 0)
merger.valueFormat2 = self.ValueFormat2 = reduce(int.__or__, [l.ValueFormat2 for l in lst], 0)
if self.Format == 1:
_PairPosFormat1_merge(self, lst, merger)
elif self.Format == 2:
_PairPosFormat2_merge(self, lst, merger)
else:
assert False
del merger.valueFormat1, merger.valueFormat2
# Now examine the list of value records, and update to the union of format values,
# as merge might have created new values.
vf1 = 0
vf2 = 0
if self.Format == 1:
for pairSet in self.PairSet:
for pairValueRecord in pairSet.PairValueRecord:
pv1 = pairValueRecord.Value1
if pv1 is not None:
vf1 |= pv1.getFormat()
pv2 = pairValueRecord.Value2
if pv2 is not None:
vf2 |= pv2.getFormat()
elif self.Format == 2:
for class1Record in self.Class1Record:
for class2Record in class1Record.Class2Record:
pv1 = class2Record.Value1
if pv1 is not None:
vf1 |= pv1.getFormat()
pv2 = class2Record.Value2
if pv2 is not None:
vf2 |= pv2.getFormat()
self.ValueFormat1 = vf1
self.ValueFormat2 = vf2
def _PairSet_flatten(lst, font):
self = ot.PairSet()
self.Coverage = ot.Coverage()
self.Coverage.Format = 1
# Align them
glyphs, padded = _merge_GlyphOrders(font,
[[v.SecondGlyph for v in vs.PairValueRecord] for vs in lst],
[vs.PairValueRecord for vs in lst])
self.Coverage.glyphs = glyphs
self.PairValueRecord = pvrs = []
for values in zip(*padded):
for v in values:
if v is not None:
pvrs.append(v)
break
else:
assert False
self.PairValueCount = len(self.PairValueRecord)
return self
def _Lookup_PairPosFormat1_subtables_flatten(lst, font):
assert _all_equal([l.ValueFormat2 == 0 for l in lst if l.PairSet]), "Report bug against fonttools."
self = ot.PairPos()
self.Format = 1
self.Coverage = ot.Coverage()
self.Coverage.Format = 1
self.ValueFormat1 = reduce(int.__or__, [l.ValueFormat1 for l in lst], 0)
self.ValueFormat2 = reduce(int.__or__, [l.ValueFormat2 for l in lst], 0)
# Align them
glyphs, padded = _merge_GlyphOrders(font,
[v.Coverage.glyphs for v in lst],
[v.PairSet for v in lst])
self.Coverage.glyphs = glyphs
self.PairSet = [_PairSet_flatten([v for v in values if v is not None], font)
for values in zip(*padded)]
self.PairSetCount = len(self.PairSet)
return self
def _Lookup_PairPosFormat2_subtables_flatten(lst, font):
assert _all_equal([l.ValueFormat2 == 0 for l in lst if l.Class1Record]), "Report bug against fonttools."
self = ot.PairPos()
self.Format = 2
self.Coverage = ot.Coverage()
self.Coverage.Format = 1
self.ValueFormat1 = reduce(int.__or__, [l.ValueFormat1 for l in lst], 0)
self.ValueFormat2 = reduce(int.__or__, [l.ValueFormat2 for l in lst], 0)
# Align them
glyphs, _ = _merge_GlyphOrders(font,
[v.Coverage.glyphs for v in lst])
self.Coverage.glyphs = glyphs
matrices = _PairPosFormat2_align_matrices(self, lst, font, transparent=True)
matrix = self.Class1Record = []
for rows in zip(*matrices):
row = ot.Class1Record()
matrix.append(row)
row.Class2Record = []
row = row.Class2Record
for cols in zip(*list(r.Class2Record for r in rows)):
col = next(iter(c for c in cols if c is not None))
row.append(col)
return self
def _Lookup_PairPos_subtables_canonicalize(lst, font):
"""Merge multiple Format1 subtables at the beginning of lst,
and merge multiple consecutive Format2 subtables that have the same
Class2 (ie. were split because of offset overflows). Returns new list."""
lst = list(lst)
l = len(lst)
i = 0
while i < l and lst[i].Format == 1:
i += 1
lst[:i] = [_Lookup_PairPosFormat1_subtables_flatten(lst[:i], font)]
l = len(lst)
i = l
while i > 0 and lst[i - 1].Format == 2:
i -= 1
lst[i:] = [_Lookup_PairPosFormat2_subtables_flatten(lst[i:], font)]
return lst
@AligningMerger.merger(ot.Lookup)
def merge(merger, self, lst):
subtables = merger.lookup_subtables = [l.SubTable for l in lst]
# Remove Extension subtables
for l,sts in list(zip(lst,subtables))+[(self,self.SubTable)]:
if not sts:
continue
if sts[0].__class__.__name__.startswith('Extension'):
assert _all_equal([st.__class__ for st in sts])
assert _all_equal([st.ExtensionLookupType for st in sts])
l.LookupType = sts[0].ExtensionLookupType
new_sts = [st.ExtSubTable for st in sts]
del sts[:]
sts.extend(new_sts)
isPairPos = self.SubTable and isinstance(self.SubTable[0], ot.PairPos)
if isPairPos:
# AFDKO and feaLib sometimes generate two Format1 subtables instead of one.
# Merge those before continuing.
# https://github.com/fonttools/fonttools/issues/719
self.SubTable = _Lookup_PairPos_subtables_canonicalize(self.SubTable, merger.font)
subtables = merger.lookup_subtables = [_Lookup_PairPos_subtables_canonicalize(st, merger.font) for st in subtables]
merger.mergeLists(self.SubTable, subtables)
self.SubTableCount = len(self.SubTable)
if isPairPos:
# If format-1 subtable created during canonicalization is empty, remove it.
assert len(self.SubTable) >= 1 and self.SubTable[0].Format == 1
if not self.SubTable[0].Coverage.glyphs:
self.SubTable.pop(0)
self.SubTableCount -= 1
# If format-2 subtable created during canonicalization is empty, remove it.
assert len(self.SubTable) >= 1 and self.SubTable[-1].Format == 2
if not self.SubTable[-1].Coverage.glyphs:
self.SubTable.pop(-1)
self.SubTableCount -= 1
merger.mergeObjects(self, lst, exclude=['SubTable', 'SubTableCount'])
del merger.lookup_subtables
#
# InstancerMerger
#
class InstancerMerger(AligningMerger):
"""A merger that takes multiple master fonts, and instantiates
an instance."""
def __init__(self, font, model, location):
Merger.__init__(self, font)
self.model = model
self.location = location
self.scalars = model.getScalars(location)
@InstancerMerger.merger(ot.Anchor)
def merge(merger, self, lst):
XCoords = [a.XCoordinate for a in lst]
YCoords = [a.YCoordinate for a in lst]
model = merger.model
scalars = merger.scalars
self.XCoordinate = round(model.interpolateFromMastersAndScalars(XCoords, scalars))
self.YCoordinate = round(model.interpolateFromMastersAndScalars(YCoords, scalars))
@InstancerMerger.merger(otBase.ValueRecord)
def merge(merger, self, lst):
model = merger.model
scalars = merger.scalars
# TODO Handle differing valueformats
for name, tableName in [('XAdvance','XAdvDevice'),
('YAdvance','YAdvDevice'),
('XPlacement','XPlaDevice'),
('YPlacement','YPlaDevice')]:
assert not hasattr(self, tableName)
if hasattr(self, name):
values = [getattr(a, name, 0) for a in lst]
value = round(model.interpolateFromMastersAndScalars(values, scalars))
setattr(self, name, value)
#
# MutatorMerger
#
class MutatorMerger(AligningMerger):
"""A merger that takes a variable font, and instantiates
an instance."""
def __init__(self, font, location):
Merger.__init__(self, font)
self.location = location
store = None
if 'GDEF' in font:
gdef = font['GDEF'].table
if gdef.Version >= 0x00010003:
store = gdef.VarStore
self.instancer = VarStoreInstancer(store, font['fvar'].axes, location)
def instantiate(self):
font = self.font
self.mergeTables(font, [font], ['GPOS'])
if 'GDEF' in font:
gdef = font['GDEF'].table
if gdef.Version >= 0x00010003:
del gdef.VarStore
gdef.Version = 0x00010002
if gdef.MarkGlyphSetsDef is None:
del gdef.MarkGlyphSetsDef
gdef.Version = 0x00010000
if not (gdef.LigCaretList or
gdef.MarkAttachClassDef or
gdef.GlyphClassDef or
gdef.AttachList or
(gdef.Version >= 0x00010002 and gdef.MarkGlyphSetsDef)):
del font['GDEF']
@MutatorMerger.merger(ot.Anchor)
def merge(merger, self, lst):
if self.Format != 3:
return
instancer = merger.instancer
for v in "XY":
tableName = v+'DeviceTable'
if not hasattr(self, tableName):
continue
dev = getattr(self, tableName)
delattr(self, tableName)
if dev is None:
continue
assert dev.DeltaFormat == 0x8000
varidx = (dev.StartSize << 16) + dev.EndSize
delta = round(instancer[varidx])
attr = v+'Coordinate'
setattr(self, attr, getattr(self, attr) + delta)
self.Format = 1
@MutatorMerger.merger(otBase.ValueRecord)
def merge(merger, self, lst):
# All other structs are merged with self pointing to a copy of base font,
# except for ValueRecords which are sometimes created later and initialized
# to have 0/None members. Hence the copy.
self.__dict__ = lst[0].__dict__.copy()
instancer = merger.instancer
# TODO Handle differing valueformats
for name, tableName in [('XAdvance','XAdvDevice'),
('YAdvance','YAdvDevice'),
('XPlacement','XPlaDevice'),
('YPlacement','YPlaDevice')]:
if not hasattr(self, tableName):
continue
dev = getattr(self, tableName)
delattr(self, tableName)
if dev is None:
continue
assert dev.DeltaFormat == 0x8000
varidx = (dev.StartSize << 16) + dev.EndSize
delta = round(instancer[varidx])
setattr(self, name, getattr(self, name) + delta)
#
# VariationMerger
#
class VariationMerger(AligningMerger):
"""A merger that takes multiple master fonts, and builds a
variable font."""
def __init__(self, model, axisTags, font):
Merger.__init__(self, font)
self.model = model
self.store_builder = varStore.OnlineVarStoreBuilder(axisTags)
self.store_builder.setModel(model)
def _all_equal(lst):
if not lst:
return True
it = iter(lst)
v0 = next(it)
for v in it:
if v0 != v:
return False
return True
def buildVarDevTable(store_builder, master_values):
if _all_equal(master_values):
return master_values[0], None
base, varIdx = store_builder.storeMasters(master_values)
return base, builder.buildVarDevTable(varIdx)
@VariationMerger.merger(ot.Anchor)
def merge(merger, self, lst):
assert self.Format == 1
self.XCoordinate, XDeviceTable = buildVarDevTable(merger.store_builder, [a.XCoordinate for a in lst])
self.YCoordinate, YDeviceTable = buildVarDevTable(merger.store_builder, [a.YCoordinate for a in lst])
if XDeviceTable or YDeviceTable:
self.Format = 3
self.XDeviceTable = XDeviceTable
self.YDeviceTable = YDeviceTable
@VariationMerger.merger(otBase.ValueRecord)
def merge(merger, self, lst):
for name, tableName in [('XAdvance','XAdvDevice'),
('YAdvance','YAdvDevice'),
('XPlacement','XPlaDevice'),
('YPlacement','YPlaDevice')]:
if hasattr(self, name):
value, deviceTable = buildVarDevTable(merger.store_builder,
[getattr(a, name, 0) for a in lst])
setattr(self, name, value)
if deviceTable:
setattr(self, tableName, deviceTable)
|