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MHOSKEN / Font-TTF-0.23 / lib / Font / TTF / Maxp.pm 

            

              
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package Font::TTF::Maxp;
=head1 NAME
Font::TTF::Maxp - Maximum Profile table in a font
=head1 DESCRIPTION
A collection of useful instance variables following the TTF standard. Probably
the most used being C<numGlyphs>. Note that this particular value is
foundational and should be kept up to date by the application, it is not updated
by C<update>.
Handles table versions 0.5, 1.0
=head1 INSTANCE VARIABLES
No others beyond those specified in the standard:
    numGlyphs
    maxPoints
    maxContours
    maxCompositePoints
    maxCompositeContours
    maxZones
    maxTwilightPoints
    maxStorage
    maxFunctionDefs
    maxInstructionDefs
    maxStackElements
    maxSizeOfInstructions
    maxComponentElements
    maxComponentDepth
=head1 METHODS
=cut
use strict;
use vars qw(@ISA %fields);
use Font::TTF::Utils;
@ISA = qw(Font::TTF::Table);
sub init
{
    my ($k, $v, $c);
    while (<Font::TTF::Maxp::DATA>)
    {
        ($k, $v, $c) = TTF_Init_Fields($_, $c);
        next unless defined $k && $k ne "";
        $fields{$k} = $v;
    }  
}
=head2 $t->read
Reads the table into memory
=cut
sub read
{
    my ($self) = @_;
    my ($dat);
    $self->SUPER::read or return $self;
    init unless defined $fields{'numGlyphs'};    # any key would do
    $self->{' INFILE'}->read($dat, 4);
    $self->{'version'} = TTF_Unpack("f", $dat);
    if ($self->{'version'} == 0.5)
    {
        $self->{' INFILE'}->read($dat, 2);
        $self->{'numGlyphs'} = unpack("n", $dat);
    } else
    {
        $self->{' INFILE'}->read($dat, 28);
        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'};
    $fh->print(TTF_Pack("f", $self->{'version'}));
     
    if ($self->{'version'} == 0.5)
    { $fh->print(pack("n", $self->{'numGlyphs'})); }
    else
    { $fh->print(TTF_Out_Fields($self, \%fields, 28)); }
    $self;
}
=head2 $t->update
Calculates all the maximum values for a font based on the glyphs in the font.
Only those fields which require hinting code interpretation are ignored and
left as they were read.
=cut
sub update
{
    my ($self) = @_;
    my ($i, $num, @n, @m, $j);
    my (@name) = qw(maxPoints maxContours maxCompositePoints maxCompositeContours
                    maxSizeOfInstructions maxComponentElements maxComponentDepth);
    return undef if ($self->{'version'} == 0.5);        # only got numGlyphs
    return undef unless (defined $self->{' PARENT'}{'loca'} && $self->{' PARENT'}{'loca'}{' isDirty'});
    $num = $self->{'numGlyphs'};
    for ($i = 0; $i < $num; $i++)
    {
        my ($g) = $self->{' PARENT'}{'loca'}{'glyphs'}[$i] || next;
        @n = $g->maxInfo($self->{' PARENT'}{'loca'}{'glyphs'});
        for ($j = 0; $j <= $#n; $j++)
        { $m[$j] = $n[$j] if $n[$j] > $m[$j]; }
    }
    foreach ('prep', 'fpgm')
    { $m[4] = length($self->{' PARENT'}{$_}{' dat'})
            if (length($self->{' PARENT'}{$_}{' dat'}) > $m[4]);
    }
    for ($j = 0; $j <= $#name; $j++)
    { $self->{$name[$j]} = $m[$j]; }
    $self->{' isDirty'} = 1;
    $self;
}
1;
=head1 BUGS
None known
=head1 AUTHOR
Martin Hosken Martin_Hosken@sil.org. See L<Font::TTF::Font> for copyright and
licensing.
=cut
__DATA__
numGlyphs, S
maxPoints, S
maxContours, S
maxCompositePoints, S
maxCompositeContours, S
maxZones, S
maxTwilightPoints, S
maxStorage, S
maxFunctionDefs, S
maxInstructionDefs, S
maxStackElements, S
maxSizeOfInstructions, S
maxComponentElements, S
maxComponentDepth, S