722 lines
26 KiB
Perl
722 lines
26 KiB
Perl
package Font::TTF::OldMort;
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=head1 NAME
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Font::TTF::OldMort - Glyph Metamorphosis table in a font
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=head1 DESCRIPTION
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=head1 INSTANCE VARIABLES
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=over
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=item version
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table version number (Fixed: currently 1.0)
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=item chains
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list of metamorphosis chains, each of which has its own fields:
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=over
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=item defaultFlags
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chain's default subfeature flags (UInt32)
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=item featureEntries
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list of feature entries, each of which has fields:
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=over
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=item type
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=item setting
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=item enable
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=item disable
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=back
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=item subtables
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list of metamorphosis subtables, each of which has fields:
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=over
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=item type
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subtable type (0: rearrangement; 1: contextual substitution; 2: ligature;
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4: non-contextual substitution; 5: insertion)
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=item direction
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processing direction ('LR' or 'RL')
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=item orientation
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applies to text in which orientation ('VH', 'V', or 'H')
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=item subFeatureFlags
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the subfeature flags controlling whether the table is used (UInt32)
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=back
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Further fields depend on the type of subtable:
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=over
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Rearrangement table:
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=over
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=item classes
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array of lists of glyphs
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=item states
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array of arrays of hashes{'nextState', 'flags'}
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=back
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Contextual substitution table:
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=over
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=item classes
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array of lists of glyphs
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=item states
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array of array of hashes{'nextState', 'flags', 'actions'}, where C<actions>
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is an array of two elements which are offsets to be added to [marked, current]
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glyph to get index into C<mappings> (or C<undef> if no mapping to be applied)
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=item mappings
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list of glyph codes mapped to through the state table mappings
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=back
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Ligature table:
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Non-contextual substitution table:
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Insertion table:
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=back
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=back
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=back
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=head1 METHODS
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=cut
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use strict;
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use vars qw(@ISA);
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use Font::TTF::Utils;
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use Font::TTF::AATutils;
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use IO::File;
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@ISA = qw(Font::TTF::Table);
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=over
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=back
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=head2 $t->read
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Reads the table into memory
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=cut
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sub read
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{
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my ($self) = @_;
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my ($dat, $fh, $numChains);
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$self->SUPER::read or return $self;
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$fh = $self->{' INFILE'};
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$fh->read($dat, 8);
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($self->{'version'}, $numChains) = TTF_Unpack("fL", $dat);
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my $chains = [];
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foreach (1 .. $numChains) {
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my $chainStart = $fh->tell();
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$fh->read($dat, 12);
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my ($defaultFlags, $chainLength, $nFeatureEntries, $nSubtables) = TTF_Unpack("LLSS", $dat);
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my $featureEntries = [];
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foreach (1 .. $nFeatureEntries) {
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$fh->read($dat, 12);
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my ($featureType, $featureSetting, $enableFlags, $disableFlags) = TTF_Unpack("SSLL", $dat);
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push @$featureEntries, {
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'type' => $featureType,
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'setting' => $featureSetting,
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'enable' => $enableFlags,
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'disable' => $disableFlags
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};
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}
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my $subtables = [];
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foreach (1 .. $nSubtables) {
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my $subtableStart = $fh->tell();
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$fh->read($dat, 8);
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my ($length, $coverage, $subFeatureFlags) = TTF_Unpack("SSL", $dat);
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my $type = $coverage & 0x0007;
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my $subtable = {
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'type' => $type,
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'direction' => (($coverage & 0x4000) ? 'RL' : 'LR'),
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'orientation' => (($coverage & 0x2000) ? 'VH' : ($coverage & 0x8000) ? 'V' : 'H'),
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'subFeatureFlags' => $subFeatureFlags
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};
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if ($type == 0) { # rearrangement
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my ($classes, $states) = AAT_read_state_table($fh, 0);
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$subtable->{'classes'} = $classes;
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$subtable->{'states'} = $states;
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}
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elsif ($type == 1) { # contextual
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my $stateTableStart = $fh->tell();
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my ($classes, $states, $entries) = AAT_read_state_table($fh, 2);
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$fh->seek($stateTableStart, IO::File::SEEK_SET);
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$fh->read($dat, 10);
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my ($stateSize, $classTable, $stateArray, $entryTable, $mappingTables) = unpack("nnnnn", $dat);
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my $limits = [$classTable, $stateArray, $entryTable, $mappingTables, $length - 8];
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foreach (@$entries) {
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my $actions = $_->{'actions'};
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foreach (@$actions) {
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$_ = $_ ? $_ - ($mappingTables / 2) : undef;
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}
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}
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$subtable->{'classes'} = $classes;
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$subtable->{'states'} = $states;
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$subtable->{'mappings'} = [unpack("n*", AAT_read_subtable($fh, $stateTableStart, $mappingTables, $limits))];
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}
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elsif ($type == 2) { # ligature
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my $stateTableStart = $fh->tell();
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my ($classes, $states, $entries) = AAT_read_state_table($fh, 0);
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$fh->seek($stateTableStart, IO::File::SEEK_SET);
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$fh->read($dat, 14);
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my ($stateSize, $classTable, $stateArray, $entryTable,
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$ligActionTable, $componentTable, $ligatureTable) = unpack("nnnnnnn", $dat);
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my $limits = [$classTable, $stateArray, $entryTable, $ligActionTable, $componentTable, $ligatureTable, $length - 8];
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my %actions;
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my $actionLists;
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foreach (@$entries) {
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my $offset = $_->{'flags'} & 0x3fff;
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$_->{'flags'} &= ~0x3fff;
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if ($offset != 0) {
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if (not defined $actions{$offset}) {
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$fh->seek($stateTableStart + $offset, IO::File::SEEK_SET);
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my $actionList;
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while (1) {
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$fh->read($dat, 4);
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my $action = unpack("N", $dat);
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my ($last, $store, $component) = (($action & 0x80000000) != 0, ($action & 0xC0000000) != 0, ($action & 0x3fffffff));
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$component -= 0x40000000 if $component > 0x1fffffff;
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$component -= $componentTable / 2;
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push @$actionList, { 'store' => $store, 'component' => $component };
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last if $last;
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}
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push @$actionLists, $actionList;
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$actions{$offset} = $#$actionLists;
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}
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$_->{'actions'} = $actions{$offset};
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}
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}
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$subtable->{'componentTable'} = $componentTable;
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my $components = [unpack("n*", AAT_read_subtable($fh, $stateTableStart, $componentTable, $limits))];
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foreach (@$components) {
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$_ = ($_ - $ligatureTable) . " +" if $_ >= $ligatureTable;
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}
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$subtable->{'components'} = $components;
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$subtable->{'ligatureTable'} = $ligatureTable;
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$subtable->{'ligatures'} = [unpack("n*", AAT_read_subtable($fh, $stateTableStart, $ligatureTable, $limits))];
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$subtable->{'classes'} = $classes;
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$subtable->{'states'} = $states;
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$subtable->{'actionLists'} = $actionLists;
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}
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elsif ($type == 4) { # non-contextual
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my ($format, $lookup) = AAT_read_lookup($fh, 2, $length - 8, undef);
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$subtable->{'format'} = $format;
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$subtable->{'lookup'} = $lookup;
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}
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elsif ($type == 5) { # insertion
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my $stateTableStart = $fh->tell();
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my ($classes, $states, $entries) = AAT_read_state_table($fh, 2);
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my %insertListHash;
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my $insertLists;
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foreach (@$entries) {
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my $flags = $_->{'flags'};
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my @insertCount = (($flags & 0x03e0) >> 5, ($flags & 0x001f));
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my $actions = $_->{'actions'};
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foreach (0 .. 1) {
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if ($insertCount[$_] > 0) {
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$fh->seek($stateTableStart + $actions->[$_], IO::File::SEEK_SET);
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$fh->read($dat, $insertCount[$_] * 2);
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if (not defined $insertListHash{$dat}) {
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push @$insertLists, [unpack("n*", $dat)];
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$insertListHash{$dat} = $#$insertLists;
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}
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$actions->[$_] = $insertListHash{$dat};
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}
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else {
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$actions->[$_] = undef;
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}
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}
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}
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$subtable->{'classes'} = $classes;
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$subtable->{'states'} = $states;
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$subtable->{'insertLists'} = $insertLists;
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}
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else {
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die "unknown subtable type";
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}
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push @$subtables, $subtable;
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$fh->seek($subtableStart + $length, IO::File::SEEK_SET);
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}
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push @$chains, {
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'defaultFlags' => $defaultFlags,
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'featureEntries' => $featureEntries,
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'subtables' => $subtables
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};
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$fh->seek($chainStart + $chainLength, IO::File::SEEK_SET);
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}
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$self->{'chains'} = $chains;
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$self;
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}
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=head2 $t->out($fh)
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Writes the table to a file either from memory or by copying
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=cut
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sub out
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{
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my ($self, $fh) = @_;
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return $self->SUPER::out($fh) unless $self->{' read'};
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my $chains = $self->{'chains'};
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$fh->print(TTF_Pack("fL", $self->{'version'}, scalar @$chains));
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foreach (@$chains) {
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my $chainStart = $fh->tell();
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my ($featureEntries, $subtables) = ($_->{'featureEntries'}, $_->{'subtables'});
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$fh->print(TTF_Pack("LLSS", $_->{'defaultFlags'}, 0, scalar @$featureEntries, scalar @$subtables)); # placeholder for length
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foreach (@$featureEntries) {
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$fh->print(TTF_Pack("SSLL", $_->{'type'}, $_->{'setting'}, $_->{'enable'}, $_->{'disable'}));
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}
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foreach (@$subtables) {
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my $subtableStart = $fh->tell();
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my $type = $_->{'type'};
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my $coverage = $type;
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$coverage += 0x4000 if $_->{'direction'} eq 'RL';
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$coverage += 0x2000 if $_->{'orientation'} eq 'VH';
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$coverage += 0x8000 if $_->{'orientation'} eq 'V';
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$fh->print(TTF_Pack("SSL", 0, $coverage, $_->{'subFeatureFlags'})); # placeholder for length
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if ($type == 0) { # rearrangement
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AAT_write_state_table($fh, $_->{'classes'}, $_->{'states'}, 0);
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}
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elsif ($type == 1) { # contextual
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my $stHeader = $fh->tell();
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$fh->print(pack("nnnnn", (0) x 5)); # placeholders for stateSize, classTable, stateArray, entryTable, mappingTables
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my $classTable = $fh->tell() - $stHeader;
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my $classes = $_->{'classes'};
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AAT_write_classes($fh, $classes);
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my $stateArray = $fh->tell() - $stHeader;
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my $states = $_->{'states'};
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my ($stateSize, $entries) = AAT_write_states($fh, $classes, $stateArray, $states,
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sub {
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my $actions = $_->{'actions'};
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( $_->{'flags'}, @$actions )
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}
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);
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my $entryTable = $fh->tell() - $stHeader;
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my $offset = ($entryTable + 8 * @$entries) / 2;
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foreach (@$entries) {
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my ($nextState, $flags, @parts) = split /,/;
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$fh->print(pack("nnnn", $nextState, $flags, map { $_ eq "" ? 0 : $_ + $offset } @parts));
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}
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my $mappingTables = $fh->tell() - $stHeader;
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my $mappings = $_->{'mappings'};
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$fh->print(pack("n*", @$mappings));
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my $loc = $fh->tell();
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$fh->seek($stHeader, IO::File::SEEK_SET);
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$fh->print(pack("nnnnn", $stateSize, $classTable, $stateArray, $entryTable, $mappingTables));
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$fh->seek($loc, IO::File::SEEK_SET);
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}
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elsif ($type == 2) { # ligature
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my $stHeader = $fh->tell();
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$fh->print(pack("nnnnnnn", (0) x 7)); # placeholders for stateSize, classTable, stateArray, entryTable, actionLists, components, ligatures
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my $classTable = $fh->tell() - $stHeader;
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my $classes = $_->{'classes'};
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AAT_write_classes($fh, $classes);
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my $stateArray = $fh->tell() - $stHeader;
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my $states = $_->{'states'};
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my ($stateSize, $entries) = AAT_write_states($fh, $classes, $stateArray, $states,
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sub {
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( $_->{'flags'} & 0xc000, $_->{'actions'} )
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}
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);
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my $actionLists = $_->{'actionLists'};
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my %actionListOffset;
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my $actionListDataLength = 0;
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my @actionListEntries;
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foreach (0 .. $#$entries) {
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my ($nextState, $flags, $offset) = split(/,/, $entries->[$_]);
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if ($offset eq "") {
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$offset = undef;
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}
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else {
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if (defined $actionListOffset{$offset}) {
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$offset = $actionListOffset{$offset};
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}
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else {
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$actionListOffset{$offset} = $actionListDataLength;
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my $list = $actionLists->[$offset];
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$actionListDataLength += 4 * @$list;
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push @actionListEntries, $list;
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$offset = $actionListOffset{$offset};
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}
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}
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$entries->[$_] = [ $nextState, $flags, $offset ];
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}
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my $entryTable = $fh->tell() - $stHeader;
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my $ligActionLists = ($entryTable + @$entries * 4 + 3) & ~3;
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foreach (@$entries) {
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$_->[2] += $ligActionLists if defined $_->[2];
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$fh->print(pack("nn", $_->[0], $_->[1] + $_->[2]));
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}
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$fh->print(pack("C*", (0) x ($ligActionLists - $entryTable - @$entries * 4)));
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die "internal error" if $fh->tell() != $ligActionLists + $stHeader;
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my $componentTable = $fh->tell() - $stHeader + $actionListDataLength;
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my $actionList;
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foreach $actionList (@actionListEntries) {
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foreach (0 .. $#$actionList) {
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my $action = $actionList->[$_];
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my $val = $action->{'component'} + $componentTable / 2;
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$val += 0x40000000 if $val < 0;
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$val &= 0x3fffffff;
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$val |= 0x40000000 if $action->{'store'};
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$val |= 0x80000000 if $_ == $#$actionList;
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$fh->print(pack("N", $val));
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}
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}
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die "internal error" if $fh->tell() != $componentTable + $stHeader;
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my $components = $_->{'components'};
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my $ligatureTable = $componentTable + @$components * 2;
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$fh->print(pack("n*", map { (index($_, '+') >= 0 ? $ligatureTable : 0) + $_ } @$components));
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my $ligatures = $_->{'ligatures'};
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$fh->print(pack("n*", @$ligatures));
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my $loc = $fh->tell();
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$fh->seek($stHeader, IO::File::SEEK_SET);
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$fh->print(pack("nnnnnnn", $stateSize, $classTable, $stateArray, $entryTable, $ligActionLists, $componentTable, $ligatureTable));
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$fh->seek($loc, IO::File::SEEK_SET);
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}
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elsif ($type == 4) { # non-contextual
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AAT_write_lookup($fh, $_->{'format'}, $_->{'lookup'}, 2, undef);
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}
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elsif ($type == 5) { # insertion
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}
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else {
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die "unknown subtable type";
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}
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my $length = $fh->tell() - $subtableStart;
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my $padBytes = (4 - ($length & 3)) & 3;
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$fh->print(pack("C*", (0) x $padBytes));
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$length += $padBytes;
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$fh->seek($subtableStart, IO::File::SEEK_SET);
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$fh->print(pack("n", $length));
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$fh->seek($subtableStart + $length, IO::File::SEEK_SET);
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}
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my $chainLength = $fh->tell() - $chainStart;
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$fh->seek($chainStart + 4, IO::File::SEEK_SET);
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$fh->print(pack("N", $chainLength));
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$fh->seek($chainStart + $chainLength, IO::File::SEEK_SET);
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}
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}
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=head2 $t->print($fh)
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Prints a human-readable representation of the table
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=cut
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sub print
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{
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my ($self, $fh) = @_;
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$self->read;
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my $feat = $self->{' PARENT'}->{'feat'};
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$feat->read;
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my $post = $self->{' PARENT'}->{'post'};
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$post->read;
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$fh = 'STDOUT' unless defined $fh;
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$fh->printf("version %f\n", $self->{'version'});
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my $chains = $self->{'chains'};
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foreach (@$chains) {
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my $defaultFlags = $_->{'defaultFlags'};
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$fh->printf("chain: defaultFlags = %08x\n", $defaultFlags);
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my $featureEntries = $_->{'featureEntries'};
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foreach (@$featureEntries) {
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$fh->printf("\tfeature %d, setting %d : enableFlags = %08x, disableFlags = %08x # '%s: %s'\n",
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$_->{'type'}, $_->{'setting'}, $_->{'enable'}, $_->{'disable'},
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$feat->settingName($_->{'type'}, $_->{'setting'}));
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}
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my $subtables = $_->{'subtables'};
|
|
foreach (@$subtables) {
|
|
my $type = $_->{'type'};
|
|
my $subFeatureFlags = $_->{'subFeatureFlags'};
|
|
$fh->printf("\n\t%s table, %s, %s, subFeatureFlags = %08x # %s (%s)\n",
|
|
subtable_type_($type), $_->{'direction'}, $_->{'orientation'}, $subFeatureFlags,
|
|
"Default " . ((($subFeatureFlags & $defaultFlags) != 0) ? "On" : "Off"),
|
|
join(", ",
|
|
map {
|
|
join(": ", $feat->settingName($_->{'type'}, $_->{'setting'}) )
|
|
} grep { ($_->{'enable'} & $subFeatureFlags) != 0 } @$featureEntries
|
|
) );
|
|
|
|
if ($type == 0) { # rearrangement
|
|
print_classes_($fh, $_, $post);
|
|
|
|
$fh->print("\n");
|
|
my $states = $_->{'states'};
|
|
my @verbs = ( "0", "Ax->xA", "xD->Dx", "AxD->DxA",
|
|
"ABx->xAB", "ABx->xBA", "xCD->CDx", "xCD->DCx",
|
|
"AxCD->CDxA", "AxCD->DCxA", "ABxD->DxAB", "ABxD->DxBA",
|
|
"ABxCD->CDxAB", "ABxCD->CDxBA", "ABxCD->DCxAB", "ABxCD->DCxBA");
|
|
foreach (0 .. $#$states) {
|
|
$fh->printf("\t\tState %d:", $_);
|
|
my $state = $states->[$_];
|
|
foreach (@$state) {
|
|
my $flags;
|
|
$flags .= "!" if ($_->{'flags'} & 0x4000);
|
|
$flags .= "<" if ($_->{'flags'} & 0x8000);
|
|
$flags .= ">" if ($_->{'flags'} & 0x2000);
|
|
$fh->printf("\t(%s%d,%s)", $flags, $_->{'nextState'}, $verbs[($_->{'flags'} & 0x000f)]);
|
|
}
|
|
$fh->print("\n");
|
|
}
|
|
}
|
|
|
|
elsif ($type == 1) { # contextual
|
|
print_classes_($fh, $_, $post);
|
|
|
|
$fh->print("\n");
|
|
my $states = $_->{'states'};
|
|
foreach (0 .. $#$states) {
|
|
$fh->printf("\t\tState %d:", $_);
|
|
my $state = $states->[$_];
|
|
foreach (@$state) {
|
|
my $flags;
|
|
$flags .= "!" if ($_->{'flags'} & 0x4000);
|
|
$flags .= "*" if ($_->{'flags'} & 0x8000);
|
|
my $actions = $_->{'actions'};
|
|
$fh->printf("\t(%s%d,%s,%s)", $flags, $_->{'nextState'}, map { defined $_ ? $_ : "=" } @$actions);
|
|
}
|
|
$fh->print("\n");
|
|
}
|
|
|
|
$fh->print("\n");
|
|
my $mappings = $_->{'mappings'};
|
|
foreach (0 .. $#$mappings) {
|
|
$fh->printf("\t\tMapping %d: %d [%s]\n", $_, $mappings->[$_], $post->{'VAL'}[$mappings->[$_]]);
|
|
}
|
|
}
|
|
|
|
elsif ($type == 2) { # ligature
|
|
print_classes_($fh, $_, $post);
|
|
|
|
$fh->print("\n");
|
|
my $states = $_->{'states'};
|
|
foreach (0 .. $#$states) {
|
|
$fh->printf("\t\tState %d:", $_);
|
|
my $state = $states->[$_];
|
|
foreach (@$state) {
|
|
my $flags;
|
|
$flags .= "!" if ($_->{'flags'} & 0x4000);
|
|
$flags .= "*" if ($_->{'flags'} & 0x8000);
|
|
$fh->printf("\t(%s%d,%s)", $flags, $_->{'nextState'}, defined $_->{'actions'} ? $_->{'actions'} : "=");
|
|
}
|
|
$fh->print("\n");
|
|
}
|
|
|
|
$fh->print("\n");
|
|
my $actionLists = $_->{'actionLists'};
|
|
foreach (0 .. $#$actionLists) {
|
|
$fh->printf("\t\tList %d:\t", $_);
|
|
my $actionList = $actionLists->[$_];
|
|
$fh->printf("%s\n", join(", ", map { ($_->{'component'} . ($_->{'store'} ? "*" : "") ) } @$actionList));
|
|
}
|
|
|
|
my $ligatureTable = $_->{'ligatureTable'};
|
|
|
|
$fh->print("\n");
|
|
my $components = $_->{'components'};
|
|
foreach (0 .. $#$components) {
|
|
$fh->printf("\t\tComponent %d: %s\n", $_, $components->[$_]);
|
|
}
|
|
|
|
$fh->print("\n");
|
|
my $ligatures = $_->{'ligatures'};
|
|
foreach (0 .. $#$ligatures) {
|
|
$fh->printf("\t\tLigature %d: %d [%s]\n", $_, $ligatures->[$_], $post->{'VAL'}[$ligatures->[$_]]);
|
|
}
|
|
}
|
|
|
|
elsif ($type == 4) { # non-contextual
|
|
my $lookup = $_->{'lookup'};
|
|
$fh->printf("\t\tLookup format %d\n", $_->{'format'});
|
|
if (defined $lookup) {
|
|
foreach (sort { $a <=> $b } keys %$lookup) {
|
|
$fh->printf("\t\t\t%d [%s] -> %d [%s])\n", $_, $post->{'VAL'}[$_], $lookup->{$_}, $post->{'VAL'}[$lookup->{$_}]);
|
|
}
|
|
}
|
|
}
|
|
|
|
elsif ($type == 5) { # insertion
|
|
print_classes_($fh, $_, $post);
|
|
|
|
$fh->print("\n");
|
|
my $states = $_->{'states'};
|
|
foreach (0 .. $#$states) {
|
|
$fh->printf("\t\tState %d:", $_);
|
|
my $state = $states->[$_];
|
|
foreach (@$state) {
|
|
my $flags;
|
|
$flags .= "!" if ($_->{'flags'} & 0x4000);
|
|
$flags .= "*" if ($_->{'flags'} & 0x8000);
|
|
my $actions = $_->{'actions'};
|
|
$fh->printf("\t(%s%d,%s,%s)", $flags, $_->{'nextState'}, map { defined $_ ? $_ : "=" } @$actions);
|
|
}
|
|
$fh->print("\n");
|
|
}
|
|
|
|
$fh->print("\n");
|
|
my $insertLists = $_->{'insertLists'};
|
|
foreach (0 .. $#$insertLists) {
|
|
my $insertList = $insertLists->[$_];
|
|
$fh->printf("\t\tList %d: %s\n", $_, join(", ", map { $_ . " [" . $post->{'VAL'}[$_] . "]" } @$insertList));
|
|
}
|
|
}
|
|
|
|
else {
|
|
# unknown
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
sub print_classes_
|
|
{
|
|
my ($fh, $subtable, $post) = @_;
|
|
|
|
my $classes = $subtable->{'classes'};
|
|
foreach (0 .. $#$classes) {
|
|
my $class = $classes->[$_];
|
|
if (defined $class) {
|
|
$fh->printf("\t\tClass %d:\t%s\n", $_, join(", ", map { $_ . " [" . $post->{'VAL'}[$_] . "]" } @$class));
|
|
}
|
|
}
|
|
}
|
|
|
|
sub subtable_type_
|
|
{
|
|
my ($val) = @_;
|
|
my ($res);
|
|
|
|
my @types = (
|
|
'Rearrangement',
|
|
'Contextual',
|
|
'Ligature',
|
|
undef,
|
|
'Non-contextual',
|
|
'Insertion',
|
|
);
|
|
$res = $types[$val] or ('Undefined (' . $val . ')');
|
|
|
|
$res;
|
|
}
|
|
|
|
1;
|
|
|
|
=head1 BUGS
|
|
|
|
None known
|
|
|
|
=head1 AUTHOR
|
|
|
|
Jonathan Kew L<http://scripts.sil.org/FontUtils>.
|
|
|
|
|
|
=head1 LICENSING
|
|
|
|
Copyright (c) 1998-2016, 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 |