package Font::TTF::Bsln;

=head1 NAME

Font::TTF::Bsln - Baseline table in a font

=head1 DESCRIPTION

=head1 INSTANCE VARIABLES

=over 

=item version

=item xformat

=item defaultBaseline

=item deltas

=item stdGlyph

=item ctlPoints

=item lookupFormat

=item lookup

=back 

=head1 METHODS

=cut

use strict;

use vars qw(@ISA);

use Font::TTF::AATutils;

use Font::TTF::Utils;

require Font::TTF::Table;

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

=head2 $t->read

Reads the table into memory

=cut

sub read

{

    my ($self) = @_;

    my ($dat, $fh);

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

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

    $fh->read($dat, 8);

    my ($version, $format, $defaultBaseline) = TTF_Unpack("vSS", $dat);

    if ($format == 0 or $format == 1) {

        $fh->read($dat, 64);

        $self->{'deltas'} = [TTF_Unpack("s*", $dat)];

    }

    elsif ($format == 2 or $format == 3) {

        $fh->read($dat, 2);

        $self->{'stdGlyph'} = unpack("n", $dat);

        $fh->read($dat, 64);

        $self->{'ctlPoints'} = unpack("n*", $dat);

    }

    else {

        die "unknown table format";

    }

    if ($format == 1 or $format == 3) {

        my $len = $self->{' LENGTH'} - ($fh->tell() - $self->{' OFFSET'});

        my ($lookupFormat, $lookup) = AAT_read_lookup($fh, 2, $len, $defaultBaseline);

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

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

    }

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

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

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

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

    my $defaultBaseline = $self->{'defaultBaseline'};

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

    AAT_write_lookup($fh, $self->{'lookupFormat'}, $self->{'lookup'}, 2, $defaultBaseline) if ($format == 1 or $format == 3);

}

=head2 $t->print($fh)

Prints a human-readable representation of the table

=cut

sub print

{

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

    $self->read;

    $fh = 'STDOUT' unless defined $fh;

    my $format = $self->{'format'};

    $fh->printf("version %f\nformat %d\ndefaultBaseline %d\n", $self->{'version'}, $format, $self->{'defaultBaseline'});

    if ($format == 0 or $format == 1) {

        $fh->printf("\tdeltas:\n");

        my $deltas = $self->{'deltas'};

        foreach (0 .. 31) {

            $fh->printf("\t\t%d: %d%s\n", $_, $deltas->[$_], defined baselineName_($_) ? "\t# " . baselineName_($_) : "");

        }

    }

    if ($format == 2 or $format == 3) {

        $fh->printf("\tstdGlyph = %d\n", $self->{'stdGlyph'});

        my $ctlPoints = $self->{'ctlPoints'};

        foreach (0 .. 31) {

            $fh->printf("\t\t%d: %d%s\n", $_, $ctlPoints->[$_], defined baselineName_($_) ? "\t# " . baselineName_($_) : "");

        }

    }

    if ($format == 1 or $format == 3) {

        $fh->printf("lookupFormat %d\n", $self->{'lookupFormat'});

        my $lookup = $self->{'lookup'};

        foreach (sort { $a <=> $b } keys %$lookup) {

            $fh->printf("\tglyph %d: %d%s\n", $_, $lookup->{$_}, defined baselineName_($_) ? "\t# " . baselineName_($_) : "");

        }

    }

}

sub baselineName_

{

    my ($b) = @_;

    my @baselines = ( 'Roman', 'Ideographic centered', 'Ideographic low', 'Hanging', 'Math' );

    $baselines[$b];

}

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