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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>.
=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
|
