PDF::API3::Compat::API2::Basic::TTF::Maxp - Maximum Profile table in a font

PDF-API3 documentation Contained in the PDF-API3 distribution.

Index

Code Index:

NAME

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PDF::API3::Compat::API2::Basic::TTF::Maxp - Maximum Profile table in a font

DESCRIPTION

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A collection of useful instance variables following the TTF standard. Probably the most used being numGlyphs. Note that this particular value is foundational and should be kept up to date by the application, it is not updated by update.

Handles table versions 0.5, 1.0

INSTANCE VARIABLES

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No others beyond those specified in the standard:

    numGlyphs
    maxPoints
    maxContours
    maxCompositePoints
    maxCompositeContours
    maxZones
    maxTwilightPoints
    maxStorage
    maxFunctionDefs
    maxInstructionDefs
    maxStackElements
    maxSizeOfInstructions
    maxComponentElements
    maxComponentDepth

METHODS

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$t->read

Reads the table into memory

$t->out($fh)

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

$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.

BUGS

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None known

AUTHOR

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Martin Hosken Martin_Hosken@sil.org. See PDF::API3::Compat::API2::Basic::TTF::Font for copyright and licensing.

PDF-API3 documentation Contained in the PDF-API3 distribution. 
#=======================================================================
#    ____  ____  _____              _    ____ ___   ____
#   |  _ \|  _ \|  ___|  _   _     / \  |  _ \_ _| |___ \
#   | |_) | | | | |_    (_) (_)   / _ \ | |_) | |    __) |
#   |  __/| |_| |  _|    _   _   / ___ \|  __/| |   / __/
#   |_|   |____/|_|     (_) (_) /_/   \_\_|  |___| |_____|
#
#   A Perl Module Chain to faciliate the Creation and Modification
#   of High-Quality "Portable Document Format (PDF)" Files.
#
#=======================================================================
#
#   THIS IS A REUSED PERL MODULE, FOR PROPER LICENCING TERMS SEE BELOW:
#
#
#   Copyright Martin Hosken <Martin_Hosken@sil.org>
#
#   No warranty or expression of effectiveness, least of all regarding
#   anyone's safety, is implied in this software or documentation.
#
#   This specific module is licensed under the Perl Artistic License.
#
#
#   $Id: Maxp.pm,v 2.0 2005/11/16 02:16:00 areibens Exp $
#
#=======================================================================
package PDF::API3::Compat::API2::Basic::TTF::Maxp;


use strict;
use vars qw(@ISA %fields @field_info);
use PDF::API3::Compat::API2::Basic::TTF::Utils;

@ISA = qw(PDF::API3::Compat::API2::Basic::TTF::Table);
@field_info = (
    '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');

sub init
{
    my ($k, $v, $c, $i);
    for ($i = 0; $i < $#field_info; $i += 2)
    {
        ($k, $v, $c) = TTF_Init_Fields($field_info[$i], $c, $field_info[$i + 1]);
        next unless defined $k && $k ne "";
        $fields{$k} = $v;
    }
}



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;
}



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;
}



sub update
{
    my ($self) = @_;
    my ($i, $num, @n, @m, $j);
    my (@name) = qw(maxPoints maxContours maxCompositePoints maxCompositeContours
                    maxSizeOfInstructions maxComponentElements maxComponentDepth);

    return undef unless ($self->SUPER::update);
    return undef if ($self->{'version'} == 0.5);        # only got numGlyphs
    return undef unless (defined $self->{' PARENT'}{'loca'});
    $self->{' PARENT'}{'loca'}->update;
    $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 (defined $self->{' PARENT'}{$_}
                && length($self->{' PARENT'}{$_}{' dat'}) > $m[4]);
    }

    for ($j = 0; $j <= $#name; $j++)
    { $self->{$name[$j]} = $m[$j]; }
    $self;
}
1;