package Font::TTF::Fdsc;

=head1 NAME

Font::TTF::Fdsc - Font Descriptors table in a font

=head1 DESCRIPTION

=head1 INSTANCE VARIABLES

=over

=item version

=item descriptors

Hash keyed by descriptor tags

=back 

=head1 METHODS

=cut

use strict;

use vars qw(@ISA %fields);

use Font::TTF::Utils;

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

=head2 $t->read

Reads the table into memory

=cut

sub read

{

    my ($self) = @_;

    my ($dat, $fh, $numDescs, $tag, $descs);

    $self->SUPER::read or return $self;

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

    $fh->read($dat, 4);

    $self->{'version'} = TTF_Unpack("v", $dat);

    $fh->read($dat, 4);

    foreach (1 .. unpack("N", $dat)) {

        $fh->read($tag, 4);

        $fh->read($dat, 4);

        $descs->{$tag} = ($tag eq 'nalf') ? unpack("N", $dat) : TTF_Unpack("f", $dat);

    }

    $self->{'descriptors'} = $descs;

    $self;

}

=head2 $t->out($fh)

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

=cut

sub out

{

    my ($self, $fh) = @_;

    my ($descs);

    return $self->SUPER::out($fh) unless $self->{' read'};

    $fh->print(TTF_Pack("v", $self->{'version'}));

    $descs = $self->{'descriptors'} || {};

    $fh->print(pack("N", scalar keys %$descs));    

    foreach (sort keys %$descs) {

        $fh->print($_);

        $fh->print(($_ eq 'nalf') ? pack("N", $descs->{$_}) : TTF_Pack("f", $descs->{$_}));

    }

    $self;

}

=head2 $t->print($fh)

Prints a human-readable representation of the table

=cut

sub print

{

    my ($self, $fh) = @_;

    my ($descs, $k);

    $self->read;

    $fh = 'STDOUT' unless defined $fh;

    $descs = $self->{'descriptors'};

    foreach $k (sort keys %$descs) {

        if ($k eq 'nalf') {

            $fh->printf("Descriptor '%s' = %d\n", $k, $descs->{$k});

        }

        else {

            $fh->printf("Descriptor '%s' = %f\n", $k, $descs->{$k});

        }

    }

    $self;

}

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