/usr/share/perl5/Font/TTF/Glyph.pm is in libfont-ttf-perl 1.04-1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 | package Font::TTF::Glyph;
=head1 NAME
Font::TTF::Glyph - Holds a information for a single glyph
=head1 DESCRIPTION
This is a single glyph description as held in a TT font. On creation only its
header is read. Thus you can get the bounding box of each glyph without having
to read all the other information.
=head1 INSTANCE VARIABLES
In addition to the named variables in a glyph header (C<xMin> etc.), there are
also all capital instance variables for holding working information, mostly
from the location table.
The standard attributes each glyph has are:
numberOfContours
xMin
yMin
xMax
yMax
There are also other, derived, instance variables for each glyph which are read
when the whole glyph is read (via C<read_dat>):
=over 4
=item instLen
Number of bytes in the hinting instructions (Warning this variable is deprecated,
use C<length($g->{'hints'})> instead).
=item hints
The string containing the hinting code for the glyph
=back
In addition there are other attribute like instance variables for simple glyphs:
=over 4
For each contour there is:
=over 4
=item endPoints
An array of endpoints for each contour in the glyph. There are
C<numberOfContours> contours in a glyph. The number of points in a glyph is
equal to the highest endpoint of a contour.
=back
There are also a number of arrays indexed by point number
=over 4
=item flags
The flags associated with reading this point. The flags for a point are
recalculated for a point when it is C<update>d. Thus the flags are not very
useful. The only important bit is bit 0 which indicates whether the point is
an 'on' curve point, or an 'off' curve point.
=item x
The absolute x co-ordinate of the point.
=item y
The absolute y co-ordinate of the point
=back
=back
For composite glyphs there are other variables
=over 4
=item metric
This holds the component number (not its glyph number) of the component from
which the metrics for this glyph should be taken.
=item comps
This is an array of hashes for each component. Each hash has a number of
elements:
=over 4
=item glyph
The glyph number of the glyph which comprises this component of the composite.
NOTE: In some badly generated fonts, C<glyph> may contain a numerical value
but that glyph might not actually exist in the font file. This could
occur in any glyph, but is particularly likely for glyphs that have
no strokes, such as SPACE, U+00A0 NO-BREAK SPACE, or
U+200B ZERO WIDTH SPACE.
=item args
An array of two arguments which may be an x, y co-ordinate or two attachment
points (one on the base glyph the other on the component). See flags for details.
=item flag
The flag for this component
=item scale
A 4 number array for component scaling. This allows stretching, rotating, etc.
Note that scaling applies to placement co-ordinates (rather than attachment points)
before locating rather than after.
=back
=item numPoints
This is a generated value which contains the number of components read in for this
compound glyph.
=back
The private instance variables are:
=over 4
=item INFILE (P)
The input file form which to read any information
=item LOC (P)
Location relative to the start of the glyf table in the read file
=item BASE (P)
The location of the glyf table in the read file
=item LEN (P)
This is the number of bytes required by the glyph. It should be kept up to date
by calling the C<update> method whenever any of the glyph content changes.
=item OUTLOC (P)
Location relative to the start of the glyf table. This variable is only active
whilst the output process is going on. It is used to inform the location table
where the glyph is located, since the glyf table is output before the loca
table due to alphabetical ordering.
=item OUTLEN (P)
This indicates the length of the glyph data when it is output. This more
accurately reflects the internal memory form than the C<LEN> variable which
only reflects the read file length. The C<OUTLEN> variable is only set after
calling C<out> or C<out_dat>.
=back
=head2 Editing
If you want to edit a glyph in some way, then you should read_dat the glyph, then
make your changes and then update the glyph or set the $g->{' isDirty'} variable.
The application must ensure that the following instance variables are
correct, from which update will calculate the rest, including the bounding box
information.
numPoints
numberOfContours
endPoints
x, y, flags (only flags bit 0)
instLen
hints
For components, the numPoints, x, y, endPoints & flags are not required but
the following information is required for each component.
flag (bits 2, 10, 11, 12)
glyph
args
scale
metric (glyph instance variable)
=head1 METHODS
=cut
use strict;
use vars qw(%fields @field_info);
use Font::TTF::Utils;
use Font::TTF::Table;
@field_info = (
'numberOfContours' => 's',
'xMin' => 's',
'yMin' => 's',
'xMax' => 's',
'yMax' => 's');
sub init
{
my ($k, $v, $c, $i);
for ($i = 0; $i < $#field_info; $i += 2)
{
($k, $v, $c) = TTF_Init_Fields($field_info[$i], $c, $field_info[$i + 1]);
next unless defined $k && $k ne "";
$fields{$k} = $v;
}
}
=head1 Font::TTF::Glyph->new(%parms)
Creates a new glyph setting various instance variables
=cut
sub new
{
my ($class, %parms) = @_;
my ($self) = {};
my ($p);
bless $self, $class;
foreach $p (keys %parms)
{ $self->{" $p"} = $parms{$p}; }
init unless defined $fields{'xMin'};
$self;
}
=head2 $g->read
Reads the header component of the glyph (numberOfContours and bounding box) and also the
glyph content, but into a data field rather than breaking it down into
its constituent structures. Use read_dat for this.
=cut
sub read
{
my ($self) = @_;
my ($fh) = $self->{' INFILE'};
my ($dat);
return $self if (defined $self->{' read'} && $self->{' read'} > 0);
$self->{' read'} = 1;
$fh->seek($self->{' LOC'} + $self->{' BASE'}, 0);
$fh->read($self->{' DAT'}, $self->{' LEN'});
TTF_Read_Fields($self, $self->{' DAT'}, \%fields);
$self;
}
=head2 $g->read_dat
Reads the contents of the glyph (components and curves, etc.) from the memory
store C<DAT> into structures within the object.
=cut
sub read_dat
{
my ($self) = @_;
my ($dat, $num, $max, $i, $flag, $len, $val, $val1, $fp);
return $self if (defined $self->{' read'} && $self->{' read'} > 1);
$self->read unless $self->{' read'};
$dat = $self->{' DAT'};
$fp = 10;
$num = $self->{'numberOfContours'};
if ($num > 0)
{
$self->{'endPoints'} = [unpack("n*", substr($dat, $fp, $num << 1))];
$fp += $num << 1;
$max = 0;
foreach (@{$self->{'endPoints'}})
{ $max = $_ if $_ > $max; }
# print STDERR join(",", unpack('C*', $self->{" DAT"}));
# printf STDERR ("(%d,%d in %d=%d @ %d)", scalar @{$self->{'endPoints'}}, $max, length($dat), $self->{' LEN'}, $fp);
$max++ if (@{$self->{'endPoints'}});
$self->{'numPoints'} = $max;
$self->{'instLen'} = unpack("n", substr($dat, $fp));
$self->{'hints'} = substr($dat, $fp + 2, $self->{'instLen'});
$fp += 2 + $self->{'instLen'};
# read the flags array
for ($i = 0; $i < $max; $i++)
{
$flag = unpack("C", substr($dat, $fp++));
$self->{'flags'}[$i] = $flag;
if ($flag & 8)
{
$len = unpack("C", substr($dat, $fp++));
while ($len-- > 0)
{
$i++;
$self->{'flags'}[$i] = $flag;
}
}
}
#read the x array
for ($i = 0; $i < $max; $i++)
{
$flag = $self->{'flags'}[$i];
if ($flag & 2)
{
$val = unpack("C", substr($dat, $fp++));
$val = -$val unless ($flag & 16);
} elsif ($flag & 16)
{ $val = 0; }
else
{
$val = TTF_Unpack("s", substr($dat, $fp));
$fp += 2;
}
$self->{'x'}[$i] = $i == 0 ? $val : $self->{'x'}[$i - 1] + $val;
}
#read the y array
for ($i = 0; $i < $max; $i++)
{
$flag = $self->{'flags'}[$i];
if ($flag & 4)
{
$val = unpack("C", substr($dat, $fp++));
$val = -$val unless ($flag & 32);
} elsif ($flag & 32)
{ $val = 0; }
else
{
$val = TTF_Unpack("s", substr($dat, $fp));
$fp += 2;
}
$self->{'y'}[$i] = $i == 0 ? $val : $self->{'y'}[$i - 1] + $val;
}
}
# compound glyph
elsif ($num < 0)
{
$flag = 1 << 5; # cheat to get the loop going
for ($i = 0; $flag & 32; $i++)
{
($flag, $self->{'comps'}[$i]{'glyph'}) = unpack("n2", substr($dat, $fp));
$fp += 4;
$self->{'comps'}[$i]{'flag'} = $flag;
if ($flag & 1) # ARGS1_AND_2_ARE_WORDS
{
$self->{'comps'}[$i]{'args'} = [TTF_Unpack("s2", substr($dat, $fp))];
$fp += 4;
} else
{
$self->{'comps'}[$i]{'args'} = [unpack("c2", substr($dat, $fp))];
$fp += 2;
}
if ($flag & 8)
{
$val = TTF_Unpack("F", substr($dat, $fp));
$fp += 2;
$self->{'comps'}[$i]{'scale'} = [$val, 0, 0, $val];
} elsif ($flag & 64)
{
($val, $val1) = TTF_Unpack("F2", substr($dat, $fp));
$fp += 4;
$self->{'comps'}[$i]{'scale'} = [$val, 0, 0, $val1];
} elsif ($flag & 128)
{
$self->{'comps'}[$i]{'scale'} = [TTF_Unpack("F4", substr($dat, $fp))];
$fp += 8;
}
$self->{'metric'} = $i if ($flag & 512);
}
$self->{'numPoints'} = $i;
if ($flag & 256) # HAVE_INSTRUCTIONS
{
$self->{'instLen'} = unpack("n", substr($dat, $fp));
$self->{'hints'} = substr($dat, $fp + 2, $self->{'instLen'});
$fp += 2 + $self->{'instLen'};
}
}
return undef if ($fp > length($dat));
$self->{' read'} = 2;
$self;
}
=head2 $g->out($fh)
Writes the glyph data to outfile
=cut
sub out
{
my ($self, $fh) = @_;
$self->read unless $self->{' read'};
$self->update if $self->{' isDirty'};
$fh->print($self->{' DAT'});
$self->{' OUTLEN'} = length($self->{' DAT'});
$self;
}
=head2 $g->out_xml($context, $depth)
Outputs an XML description of the glyph
=cut
sub out_xml
{
my ($self, $context, $depth) = @_;
my ($addr) = ($self =~ m/\((.+)\)$/o);
my ($k, $ndepth);
if ($context->{'addresses'}{$addr})
{
$context->{'fh'}->printf("%s<glyph gid='%s' id_ref='%s'/>\n", $depth, $context->{'gid'}, $context->{'addresses'}{$addr});
return $self;
}
else
{
$context->{'fh'}->printf("%s<glyph gid='%s'>\n", $depth, $context->{'gid'});
}
$ndepth = $depth . $context->{'indent'};
$self->read_dat;
foreach $k (sort grep {$_ !~ m/^\s/o} keys %{$self})
{
$self->XML_element($context, $ndepth, $k, $self->{$k});
}
$context->{'fh'}->print("$depth</glyph>\n");
delete $context->{'done_points'};
$self;
}
sub XML_element
{
my ($self, $context, $depth, $key, $val) = @_;
my ($fh) = $context->{'fh'};
my ($dind) = $depth . $context->{'indent'};
my ($i);
if ($self->{'numberOfContours'} >= 0 && ($key eq 'x' || $key eq 'y' || $key eq 'flags'))
{
return $self if ($context->{'done_points'});
$context->{'done_points'} = 1;
$fh->print("$depth<points>\n");
for ($i = 0; $i <= $#{$self->{'flags'}}; $i++)
{ $fh->printf("%s<point x='%s' y='%s' flags='0x%02X'/>\n", $dind,
$self->{'x'}[$i], $self->{'y'}[$i], $self->{'flags'}[$i]); }
$fh->print("$depth</points>\n");
}
elsif ($key eq 'hints')
{
my ($dat);
$fh->print("$depth<hints>\n");
# Font::TTF::Utils::XML_hexdump($context, $depth . $context->{'indent'}, $self->{'hints'});
$dat = Font::TTF::Utils::XML_binhint($self->{'hints'}) || "";
$dat =~ s/\n(?!$)/\n$depth$context->{'indent'}/mg;
$fh->print("$depth$context->{'indent'}$dat");
$fh->print("$depth</hints>\n");
}
else
{ return Font::TTF::Table::XML_element(@_); }
$self;
}
=head2 $g->dirty($val)
This sets the dirty flag to the given value or 1 if no given value. It returns the
value of the flag
=cut
sub dirty
{
my ($self, $val) = @_;
my ($res) = $self->{' isDirty'};
$self->{' isDirty'} = defined $val ? $val : 1;
$res;
}
=head2 $g->update
Generates a C<$self->{'DAT'}> from the internal structures, if the data has
been read into structures in the first place. If you are building a glyph
from scratch you will need to set the instance variable C<' isDirty'>.
=cut
sub update
{
my ($self) = @_;
my ($dat, $loc, $len, $flag, $x, $y, $i, $comp, $num, @rflags, $repeat);
return $self unless ($self->{' isDirty'});
$self->read_dat->update_bbox;
$self->{' DAT'} = TTF_Out_Fields($self, \%fields, 10);
$num = $self->{'numberOfContours'};
if ($num > 0)
{
$self->{' DAT'} .= pack("n*", @{$self->{'endPoints'}});
$len = $self->{'instLen'};
$self->{' DAT'} .= pack("n", $len);
$self->{' DAT'} .= pack("a" . $len, substr($self->{'hints'}, 0, $len)) if ($len > 0);
$repeat = 0;
for ($i = 0; $i < $self->{'numPoints'}; $i++)
{
$flag = $self->{'flags'}[$i] & 1;
if ($i == 0)
{
$x = $self->{'x'}[$i];
$y = $self->{'y'}[$i];
} else
{
$x = $self->{'x'}[$i] - $self->{'x'}[$i - 1];
$y = $self->{'y'}[$i] - $self->{'y'}[$i - 1];
}
$flag |= 16 if ($x == 0);
$flag |= 32 if ($y == 0);
if (($flag & 16) == 0 && $x < 256 && $x > -256)
{
$flag |= 2;
$flag |= 16 if ($x >= 0);
}
if (($flag & 32) == 0 && $y < 256 && $y > -256)
{
$flag |= 4;
$flag |= 32 if ($y >= 0);
}
if ($i > 0 && $rflags[-1] == $flag && $repeat < 255)
{
$repeat++;
} else
{
if ($repeat)
{
$rflags[-1] |= 8;
push @rflags, $repeat;
}
push @rflags, $flag;
$repeat = 0;
}
$self->{'flags'}[$i] = $flag;
}
# Add final repeat if needed, then pack up the flag bytes:
if ($repeat)
{
$rflags[-1] |= 8;
push @rflags, $repeat;
}
$self->{' DAT'} .= pack("C*", @rflags);
for ($i = 0; $i < $self->{'numPoints'}; $i++)
{
$flag = $self->{'flags'}[$i];
$x = $self->{'x'}[$i] - (($i == 0) ? 0 : $self->{'x'}[$i - 1]);
if (($flag & 18) == 0)
{ $self->{' DAT'} .= TTF_Pack("s", $x); }
elsif (($flag & 18) == 18)
{ $self->{' DAT'} .= pack("C", $x); }
elsif (($flag & 18) == 2)
{ $self->{' DAT'} .= pack("C", -$x); }
}
for ($i = 0; $i < $self->{'numPoints'}; $i++)
{
$flag = $self->{'flags'}[$i];
$y = $self->{'y'}[$i] - (($i == 0) ? 0 : $self->{'y'}[$i - 1]);
if (($flag & 36) == 0)
{ $self->{' DAT'} .= TTF_Pack("s", $y); }
elsif (($flag & 36) == 36)
{ $self->{' DAT'} .= pack("C", $y); }
elsif (($flag & 36) == 4)
{ $self->{' DAT'} .= pack("C", -$y); }
}
}
elsif ($num < 0)
{
for ($i = 0; $i <= $#{$self->{'comps'}}; $i++)
{
$comp = $self->{'comps'}[$i];
$flag = $comp->{'flag'} & 7158; # bits 2,10,11,12
$flag |= 1 unless ($comp->{'args'}[0] > -129 && $comp->{'args'}[0] < 128
&& $comp->{'args'}[1] > -129 && $comp->{'args'}[1] < 128);
if (defined $comp->{'scale'})
{
if ($comp->{'scale'}[1] == 0 && $comp->{'scale'}[2] == 0)
{
if ($comp->{'scale'}[0] == $comp->{'scale'}[3])
{ $flag |= 8 unless ($comp->{'scale'}[0] == 0
|| $comp->{'scale'}[0] == 1); }
else
{ $flag |= 64; }
} else
{ $flag |= 128; }
}
$flag |= 512 if (defined $self->{'metric'} && $self->{'metric'} == $i);
if ($i == $#{$self->{'comps'}})
{ $flag |= 256 if (defined $self->{'instLen'} && $self->{'instLen'} > 0); }
else
{ $flag |= 32; }
$self->{' DAT'} .= pack("n", $flag);
$self->{' DAT'} .= pack("n", $comp->{'glyph'});
$comp->{'flag'} = $flag;
if ($flag & 1)
{ $self->{' DAT'} .= TTF_Pack("s2", @{$comp->{'args'}}); }
else
{ $self->{' DAT'} .= pack("CC", @{$comp->{'args'}}); }
if ($flag & 8)
{ $self->{' DAT'} .= TTF_Pack("F", $comp->{'scale'}[0]); }
elsif ($flag & 64)
{ $self->{' DAT'} .= TTF_Pack("F2", $comp->{'scale'}[0], $comp->{'scale'}[3]); }
elsif ($flag & 128)
{ $self->{' DAT'} .= TTF_Pack("F4", @{$comp->{'scale'}}); }
}
if (defined $self->{'instLen'} && $self->{'instLen'} > 0)
{
$len = $self->{'instLen'};
$self->{' DAT'} .= pack("n", $len);
$self->{' DAT'} .= pack("a" . $len, substr($self->{'hints'}, 0, $len));
}
}
my ($olen) = length($self->{' DAT'});
$self->{' DAT'} .= ("\000") x (4 - ($olen & 3)) if ($olen & 3);
$self->{' OUTLEN'} = length($self->{' DAT'});
$self->{' read'} = 2; # changed from 1 to 2 so we don't read_dat() again
# we leave numPoints and instLen since maxp stats use this
$self;
}
=head2 $g->update_bbox
Updates the bounding box for this glyph according to the points in the glyph
=cut
sub update_bbox
{
my ($self) = @_;
my ($num, $maxx, $minx, $maxy, $miny, $i, $comp, $x, $y, $compg);
return $self unless (defined $self->{' read'} && $self->{' read'} > 1); # only if read_dat done
$miny = $minx = 65537; $maxx = $maxy = -65537;
$num = $self->{'numberOfContours'};
if ($num > 0)
{
for ($i = 0; $i < $self->{'numPoints'}; $i++)
{
($x, $y) = ($self->{'x'}[$i], $self->{'y'}[$i]);
$maxx = $x if ($x > $maxx);
$minx = $x if ($x < $minx);
$maxy = $y if ($y > $maxy);
$miny = $y if ($y < $miny);
}
}
elsif ($num < 0)
{
foreach $comp (@{$self->{'comps'}})
{
my ($gnx, $gny, $gxx, $gxy);
my ($sxx, $sxy, $syx, $syy);
my $otherg = $self->{' PARENT'}{'loca'}{'glyphs'}[$comp->{'glyph'}];
# work around bad fonts: see documentation for 'comps' above
next unless (defined $otherg);
$compg = $otherg->read->update_bbox;
($gnx, $gny, $gxx, $gxy) = @{$compg}{'xMin', 'yMin', 'xMax', 'yMax'};
if (defined $comp->{'scale'})
{
($sxx, $sxy, $syx, $syy) = @{$comp->{'scale'}};
($gnx, $gny, $gxx, $gxy) = ($gnx*$sxx+$gny*$syx + $comp->{'args'}[0],
$gnx*$sxy+$gny*$syy + $comp->{'args'}[1],
$gxx*$sxx+$gxy*$syx + $comp->{'args'}[0],
$gxx*$sxy+$gxy*$syy + $comp->{'args'}[1]);
} elsif ($comp->{'args'}[0] || $comp->{'args'}[1])
{
$gnx += $comp->{'args'}[0];
$gny += $comp->{'args'}[1];
$gxx += $comp->{'args'}[0];
$gxy += $comp->{'args'}[1];
}
($gnx, $gxx) = ($gxx, $gnx) if $gnx > $gxx;
($gny, $gxy) = ($gxy, $gny) if $gny > $gxy;
$maxx = $gxx if $gxx > $maxx;
$minx = $gnx if $gnx < $minx;
$maxy = $gxy if $gxy > $maxy;
$miny = $gny if $gny < $miny;
}
}
$self->{'xMax'} = $maxx;
$self->{'xMin'} = $minx;
$self->{'yMax'} = $maxy;
$self->{'yMin'} = $miny;
$self;
}
=head2 $g->maxInfo
Returns lots of information about a glyph so that the C<maxp> table can update
itself. Returns array containing contributions of this glyph to maxPoints, maxContours,
maxCompositePoints, maxCompositeContours, maxSizeOfInstructions, maxComponentElements,
and maxComponentDepth.
=cut
sub maxInfo
{
my ($self) = @_;
my (@res, $i, @n);
$self->read_dat; # make sure we've read some data
$res[4] = length($self->{'hints'}) if defined $self->{'hints'};
$res[6] = 1;
if ($self->{'numberOfContours'} > 0)
{
$res[0] = $self->{'numPoints'};
$res[1] = $self->{'numberOfContours'};
} elsif ($self->{'numberOfContours'} < 0)
{
for ($i = 0; $i <= $#{$self->{'comps'}}; $i++)
{
my $otherg =
$self->{' PARENT'}{'loca'}{'glyphs'}
[$self->{'comps'}[$i]{'glyph'}];
# work around bad fonts: see documentation for 'comps' above
next unless (defined $otherg );
@n = $otherg->maxInfo;
$res[2] += $n[2] == 0 ? $n[0] : $n[2];
$res[3] += $n[3] == 0 ? $n[1] : $n[3];
$res[5]++;
$res[6] = $n[6] + 1 if ($n[6] >= $res[6]);
}
}
@res;
}
=head2 $g->empty
Empties the glyph of all information to the level of not having been read.
Useful for saving memory in apps with many glyphs being read
=cut
sub empty
{
my ($self) = @_;
my (%keep) = map {(" $_" => 1)} ('LOC', 'OUTLOC', 'PARENT', 'INFILE', 'BASE',
'OUTLEN', 'LEN');
map {delete $self->{$_} unless $keep{$_}} keys %$self;
$self;
}
=head2 $g->get_points
This method creates point information for a compound glyph. The information is
stored in the same place as if the glyph was not a compound, but since
numberOfContours is negative, the glyph is still marked as being a compound
=cut
sub get_points
{
my ($self) = @_;
my ($comp, $compg, $nump, $e, $i);
$self->read_dat;
return undef unless ($self->{'numberOfContours'} < 0);
foreach $comp (@{$self->{'comps'}})
{
$compg = $self->{' PARENT'}{'loca'}{'glyphs'}[$comp->{'glyph'}];
# work around bad fonts: see documentation for 'comps' above
next unless (defined $compg );
$compg->get_points;
for ($i = 0; $i < $compg->{'numPoints'}; $i++)
{
my ($x, $y) = ($compg->{'x'}[$i], $compg->{'y'}[$i]);
if (defined $comp->{'scale'})
{
($x, $y) = ($x * $comp->{'scale'}[0] + $y * $comp->{'scale'}[2],
$x * $comp->{'scale'}[1] + $y * $comp->{'scale'}[3]);
}
if (defined $comp->{'args'})
{ ($x, $y) = ($x + $comp->{'args'}[0], $y + $comp->{'args'}[1]); }
push (@{$self->{'x'}}, $x);
push (@{$self->{'y'}}, $y);
push (@{$self->{'flags'}}, $compg->{'flags'}[$i]);
}
foreach $e (@{$compg->{'endPoints'}})
{ push (@{$self->{'endPoints'}}, $e + $nump); }
$nump += $compg->{'numPoints'};
}
$self->{'numPoints'} = $nump;
$self;
}
=head2 $g->get_refs
Returns an array of all the glyph ids that are used to make up this glyph. That
is all the compounds and their references and so on. If this glyph is not a
compound, then returns an empty array.
Please note the warning about bad fonts that reference nonexistant glyphs
under INSTANCE VARIABLES above. This function will not attempt to
filter out nonexistant glyph numbers.
=cut
sub get_refs
{
my ($self) = @_;
my (@res, $g);
$self->read_dat;
return unless ($self->{'numberOfContours'} < 0);
foreach $g (@{$self->{'comps'}})
{
push (@res, $g->{'glyph'});
my $otherg = $self->{' PARENT'}{'loca'}{'glyphs'}[$g->{'glyph'}];
# work around bad fonts: see documentation for 'comps' above
next unless (defined $otherg);
my @list = $otherg->get_refs;
push(@res, @list);
}
return @res;
}
1;
=head1 BUGS
=over 4
=item *
The instance variables used here are somewhat clunky and inconsistent with
the other tables.
=item *
C<update> doesn't re-calculate the bounding box or C<numberOfContours>.
=back
=head1 AUTHOR
Martin Hosken L<Martin_Hosken@sil.org>.
=head1 LICENSING
Copyright (c) 1998-2013, SIL International (http://www.sil.org)
This module is released under the terms of the Artistic License 2.0.
For details, see the full text of the license in the file LICENSE.
=cut
|