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package Font::TTF::Mort::Contextual;
=head1 NAME
Font::TTF::Mort::Contextual - Contextual Mort subtable for AAT
=head1 METHODS
=cut
use strict;
use vars qw(@ISA);
use Font::TTF::Utils;
use Font::TTF::AATutils;
use IO::File;
@ISA = qw(Font::TTF::Mort::Subtable);
sub new
{
my ($class, $direction, $orientation, $subFeatureFlags) = @_;
my ($self) = {
'direction' => $direction,
'orientation' => $orientation,
'subFeatureFlags' => $subFeatureFlags
};
$class = ref($class) || $class;
bless $self, $class;
}
=head2 $t->read
Reads the table into memory
=cut
sub read
{
my ($self, $fh) = @_;
my ($dat);
my $stateTableStart = $fh->tell();
my ($classes, $states, $entries) = AAT_read_state_table($fh, 2);
$fh->seek($stateTableStart, IO::File::SEEK_SET);
$fh->read($dat, 10);
my ($stateSize, $classTable, $stateArray, $entryTable, $mappingTables) = unpack("nnnnn", $dat);
my $limits = [$classTable, $stateArray, $entryTable, $mappingTables, $self->{'length'} - 8];
foreach (@$entries) {
my $actions = $_->{'actions'};
foreach (@$actions) {
$_ = $_ ? $_ - ($mappingTables / 2) : undef;
}
}
$self->{'classes'} = $classes;
$self->{'states'} = $states;
$self->{'mappings'} = [unpack("n*", AAT_read_subtable($fh, $stateTableStart, $mappingTables, $limits))];
$self;
}
=head2 $t->pack_sub()
=cut
sub pack_sub
{
my ($self) = @_;
my ($dat) = pack("nnnnn", (0) x 5); # placeholders for stateSize, classTable, stateArray, entryTable, mappingTables
my $classTable = length($dat);
my $classes = $self->{'classes'};
$dat .= AAT_pack_classes($classes);
my $stateArray = length($dat);
my $states = $self->{'states'};
my ($dat1, $stateSize, $entries) = AAT_pack_states($classes, $stateArray, $states,
sub {
my $actions = $_->{'actions'};
( $_->{'flags'}, @$actions )
}
);
$dat .= $dat1;
my $entryTable = length($dat);
my $offset = ($entryTable + 8 * @$entries) / 2;
foreach (@$entries) {
my ($nextState, $flags, @parts) = split /,/;
$dat .= pack("nnnn", $nextState, $flags, map { $_ eq "" ? 0 : $_ + $offset } @parts);
}
my $mappingTables = length($dat);
my $mappings = $self->{'mappings'};
$dat .= pack("n*", @$mappings);
$dat1 = pack("nnnnn", $stateSize, $classTable, $stateArray, $entryTable, $mappingTables);
substr($dat, 0, length($dat1)) = $dat1;
return $dat;
}
=head2 $t->print($fh)
Prints a human-readable representation of the table
=cut
sub print
{
my ($self, $fh) = @_;
my $post = $self->post();
$fh = 'STDOUT' unless defined $fh;
$self->print_classes($fh);
$fh->print("\n");
my $states = $self->{'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 = $self->{'mappings'};
foreach (0 .. $#$mappings) {
$fh->printf("\t\tMapping %d: %d [%s]\n", $_, $mappings->[$_], $post->{'VAL'}[$mappings->[$_]]);
}
}
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
|
