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}


=head2 $t->read

Reads the table into memory as instance variables

=cut

sub read
{
    my ($self) = @_;
    my ($dat);

    $self->SUPER::read or return $self;
    init unless defined $fields{'Ascender'};
    $self->{' INFILE'}->read($dat, 36);

    TTF_Read_Fields($self, $dat, \%fields);
    $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'};

    $self->{'numberOfVMetrics'} = $self->{' PARENT'}{'vmtx'}->numMetrics || $self->{'numberOfVMetrics'};
    $fh->print(TTF_Out_Fields($self, \%fields, 36));
    $self;
}

=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 36;
}


=head2 $t->update

Updates various parameters in the hhea table from the hmtx table, assuming
the C<hmtx> table is dirty.

=cut

sub update
{
    my ($self) = @_;
    my ($vmtx) = $self->{' PARENT'}{'vmtx'};
    my ($glyphs);
    my ($num);
    my ($i, $maw, $mlsb, $mrsb, $mext, $aw, $lsb, $ext);

    return undef unless ($self->SUPER::update);
    return undef unless (defined $vmtx && defined $self->{' PARENT'}{'loca'});
    $vmtx->read->update;
    $self->{' PARENT'}{'loca'}->read->update;
    $glyphs = $self->{' PARENT'}{'loca'}{'glyphs'};
    $num = $self->{' PARENT'}{'maxp'}{'numGlyphs'};

    for ($i = 0; $i < $num; $i++)
    {
        $aw = $vmtx->{'advance'}[$i];
        $lsb = $vmtx->{'top'}[$i];
        if (defined $glyphs->[$i])
        { $ext = $lsb + $glyphs->[$i]->read->{'yMax'} - $glyphs->[$i]{'yMin'}; }
        else
        { $ext = $aw; }
        $maw = $aw if ($aw > $maw);
        $mlsb = $lsb if ($lsb < $mlsb or $i == 0);
        $mrsb = $aw - $ext if ($aw - $ext < $mrsb or $i == 0);
        $mext = $ext if ($ext > $mext);
    }
    $self->{'advanceHeightMax'} = $maw;
    $self->{'minTopSideBearing'} = $mlsb;
    $self->{'minBottomSideBearing'} = $mrsb;
    $self->{'yMaxExtent'} = $mext;
    $self->{'numberOfVMetrics'} = $vmtx->numMetrics;
    $self;
}


1;


=head1 BUGS

None known

=head1 AUTHOR

Martin Hosken 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