package Font::TTF::Mort;

=head1 NAME

Font::TTF::Mort - Glyph Metamorphosis table in a font

=head1 METHODS

=cut

use strict;
use vars qw(@ISA);
use Font::TTF::Utils;
use Font::TTF::AATutils;
use Font::TTF::Mort::Chain;

@ISA = qw(Font::TTF::Table);

=head2 $t->read

Reads the table into memory

=cut

sub read
{
    my ($self) = @_;
    my ($dat, $fh, $numChains);
    
    $self->SUPER::read or return $self;

    $fh = $self->{' INFILE'};

    $fh->read($dat, 8);
    ($self->{'version'}, $numChains) = TTF_Unpack("vL", $dat);
    
    my $chains = [];
    foreach (1 .. $numChains) {
        my $chain = new Font::TTF::Mort::Chain->new;
        $chain->read($fh);
        $chain->{' PARENT'} = $self;
        push @$chains, $chain;
    }

    $self->{'chains'} = $chains;

    $self;
}

=head2 $t->out($fh)

Writes the table to a file either from memory or by copying

=cut

sub out
{
    my ($self, $fh) = @_;
    
    return $self->SUPER::out($fh) unless $self->{' read'};

    my $chains = $self->{'chains'};
    $fh->print(TTF_Pack("vL", $self->{'version'}, scalar @$chains));

    foreach (@$chains) {
        $_->out($fh);
    }
}

=head2 $t->minsize()

Returns the minimum size this table can be. If it is smaller than this, then the table
must be bad and should be deleted or whatever.

=cut

sub minsize
{
    return 8;
}

=head2 $t->print($fh)

Prints a human-readable representation of the table

=cut

sub print
{
    my ($self, $fh) = @_;
    
    $self->read unless $self->{' read'};
    my $feat = $self->{' PARENT'}->{'feat'};
    $feat->read;
    my $post = $self->{' PARENT'}->{'post'};
    $post->read;
    
    $fh = 'STDOUT' unless defined $fh;

    $fh->printf("version %f\n", $self->{'version'});
    
    my $chains = $self->{'chains'};
    foreach (@$chains) {
        $_->print($fh);
    }
}

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.

The test suite contains test fonts released under the SIL Open Font License 1.1, see OFL.txt.

=cut