--- /dev/null
+package Font::TTF::Mort::Chain;
+
+=head1 NAME
+
+Font::TTF::Mort::Chain - Chain Mort subtable for AAT
+
+=cut
+
+use strict;
+use Font::TTF::Utils;
+use Font::TTF::AATutils;
+use Font::TTF::Mort::Subtable;
+use IO::File;
+
+=head2 $t->new
+
+=cut
+
+sub new
+{
+ my ($class, %parms) = @_;
+ my ($self) = {};
+ my ($p);
+
+ $class = ref($class) || $class;
+ foreach $p (keys %parms)
+ { $self->{" $p"} = $parms{$p}; }
+ bless $self, $class;
+}
+
+=head2 $t->read($fh)
+
+Reads the chain into memory
+
+=cut
+
+sub read
+{
+ my ($self, $fh) = @_;
+ my ($dat);
+
+ my $chainStart = $fh->tell();
+ $fh->read($dat, 12);
+ my ($defaultFlags, $chainLength, $nFeatureEntries, $nSubtables) = TTF_Unpack("LLSS", $dat);
+
+ my $featureEntries = [];
+ foreach (1 .. $nFeatureEntries) {
+ $fh->read($dat, 12);
+ my ($featureType, $featureSetting, $enableFlags, $disableFlags) = TTF_Unpack("SSLL", $dat);
+ push @$featureEntries, {
+ 'type' => $featureType,
+ 'setting' => $featureSetting,
+ 'enable' => $enableFlags,
+ 'disable' => $disableFlags
+ };
+ }
+
+ my $subtables = [];
+ foreach (1 .. $nSubtables) {
+ my $subtableStart = $fh->tell();
+
+ $fh->read($dat, 8);
+ my ($length, $coverage, $subFeatureFlags) = TTF_Unpack("SSL", $dat);
+ my $type = $coverage & 0x0007;
+
+ my $subtable = Font::TTF::Mort::Subtable->create($type, $coverage, $subFeatureFlags, $length);
+ $subtable->read($fh);
+ $subtable->{' PARENT'} = $self;
+
+ push @$subtables, $subtable;
+ $fh->seek($subtableStart + $length, IO::File::SEEK_SET);
+ }
+
+ $self->{'defaultFlags'} = $defaultFlags;
+ $self->{'featureEntries'} = $featureEntries;
+ $self->{'subtables'} = $subtables;
+
+ $fh->seek($chainStart + $chainLength, IO::File::SEEK_SET);
+
+ $self;
+}
+
+=head2 $t->out($fh)
+
+Writes the table to a file either from memory or by copying
+
+=cut
+
+sub out
+{
+ my ($self, $fh) = @_;
+
+ my $chainStart = $fh->tell();
+ my ($featureEntries, $subtables) = ($_->{'featureEntries'}, $_->{'subtables'});
+ $fh->print(TTF_Pack("LLSS", $_->{'defaultFlags'}, 0, scalar @$featureEntries, scalar @$subtables)); # placeholder for length
+
+ foreach (@$featureEntries) {
+ $fh->print(TTF_Pack("SSLL", $_->{'type'}, $_->{'setting'}, $_->{'enable'}, $_->{'disable'}));
+ }
+
+ foreach (@$subtables) {
+ $_->out($fh);
+ }
+
+ my $chainLength = $fh->tell() - $chainStart;
+ $fh->seek($chainStart + 4, IO::File::SEEK_SET);
+ $fh->print(pack("N", $chainLength));
+ $fh->seek($chainStart + $chainLength, IO::File::SEEK_SET);
+}
+
+=head2 $t->print($fh)
+
+Prints a human-readable representation of the chain
+
+=cut
+
+sub feat
+{
+ my ($self) = @_;
+
+ my $feat = $self->{' PARENT'}{' PARENT'}{'feat'};
+ if (defined $feat) {
+ $feat->read;
+ }
+ else {
+ $feat = {};
+ }
+
+ return $feat;
+}
+
+sub print
+{
+ my ($self, $fh) = @_;
+
+ $fh->printf("version %f\n", $self->{'version'});
+
+ my $defaultFlags = $self->{'defaultFlags'};
+ $fh->printf("chain: defaultFlags = %08x\n", $defaultFlags);
+
+ my $feat = $self->feat();
+ my $featureEntries = $self->{'featureEntries'};
+ foreach (@$featureEntries) {
+ $fh->printf("\tfeature %d, setting %d : enableFlags = %08x, disableFlags = %08x # '%s: %s'\n",
+ $_->{'type'}, $_->{'setting'}, $_->{'enable'}, $_->{'disable'},
+ $feat->settingName($_->{'type'}, $_->{'setting'}));
+ }
+
+ my $subtables = $self->{'subtables'};
+ foreach (@$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
+ ) );
+
+ $_->print($fh);
+ }
+}
+
+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<Jonathan_Kew@sil.org>. See L<Font::TTF::Font> for copyright and
+licensing.
+
+=cut
+