#=======================================================================
# ____ ____ _____ _ ____ ___ ____
# | _ \| _ \| ___| _ _ / \ | _ \_ _| |___ \
# | |_) | | | | |_ (_) (_) / _ \ | |_) | | __) |
# | __/| |_| | _| _ _ / ___ \| __/| | / __/
# |_| |____/|_| (_) (_) /_/ \_\_| |___| |_____|
#
# 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 Jonathan Kew L<Jonathan_Kew@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: Contextual.pm,v 2.0 2005/11/16 02:16:00 areibens Exp $
#
#=======================================================================
=head1 NAME
PDF::API2::Basic::TTF::Mort::Contextual
=head1 METHODS
=cut
use strict;
use vars qw(@ISA);
@ISA = qw(PDF::API2::Basic::TTF::AAT::Mort::Subtable);
sub new
{
my ($class, $direction, $orientation, $subFeatureFlags) = @_;
my ($self) = {
'direction' => $direction,
'orientation' => $orientation,
'subFeatureFlags' => $subFeatureFlags
};
$class = ref($class) || $class;
bless $self, $class;
}
=head2 $t->read
Reads the table into memory
=cut
sub read
{
my ($self, $fh) = @_;
my ($dat);
my $stateTableStart = $fh->tell();
my ($classes, $states, $entries) = AAT_read_state_table($fh, 2);
$fh->seek($stateTableStart, IO::File::SEEK_SET);
$fh->read($dat, 10);
my ($stateSize, $classTable, $stateArray, $entryTable, $mappingTables) = unpack("nnnnn", $dat);
my $limits = [$classTable, $stateArray, $entryTable, $mappingTables, $self->{'length'} - 8];
foreach (@$entries) {
my $actions = $_->{'actions'};
foreach (@$actions) {
$_ = $_ ? $_ - ($mappingTables / 2) : undef;
}
}
$self->{'classes'} = $classes;
$self->{'states'} = $states;
$self->{'mappings'} = [unpack("n*", AAT_read_subtable($fh, $stateTableStart, $mappingTables, $limits))];
$self;
}
=head2 $t->pack_sub()
=cut
sub pack_sub
{
my ($self) = @_;
my ($dat) = pack("nnnnn", (0) x 5); # placeholders for stateSize, classTable, stateArray, entryTable, mappingTables
my $classTable = length($dat);
my $classes = $self->{'classes'};
$dat .= AAT_pack_classes($classes);
my $stateArray = length($dat);
my $states = $self->{'states'};
my ($dat1, $stateSize, $entries) = AAT_pack_states($classes, $stateArray, $states,
sub {
my $actions = $_->{'actions'};
( $_->{'flags'}, @$actions )
}
);
$dat .= $dat1;
my $entryTable = length($dat);
my $offset = ($entryTable + 8 * @$entries) / 2;
foreach (@$entries) {
my ($nextState, $flags, @parts) = split /,/;
$dat .= pack("nnnn", $nextState, $flags, map { $_ eq "" ? 0 : $_ + $offset } @parts);
}
my $mappingTables = length($dat);
my $mappings = $self->{'mappings'};
$dat .= pack("n*", @$mappings);
$dat1 = pack("nnnnn", $stateSize, $classTable, $stateArray, $entryTable, $mappingTables);
substr($dat, 0, length($dat1)) = $dat1;
return $dat;
}
=head2 $t->print($fh)
Prints a human-readable representation of the table
=cut
sub print
{
my ($self, $fh) = @_;
my $post = $self->post();
$fh = 'STDOUT' unless defined $fh;
$self->print_classes($fh);
$fh->print("\n");
my $states = $self->{'states'};
foreach (0 .. $#$states) {
$fh->printf("\t\tState %d:", $_);
my $state = $states->[$_];
foreach (@$state) {
my $flags;
$flags .= "!" if ($_->{'flags'} & 0x4000);
$flags .= "*" if ($_->{'flags'} & 0x8000);
my $actions = $_->{'actions'};
$fh->printf("\t(%s%d,%s,%s)", $flags, $_->{'nextState'}, map { defined $_ ? $_ : "=" } @$actions);
}
$fh->print("\n");
}
$fh->print("\n");
my $mappings = $self->{'mappings'};
foreach (0 .. $#$mappings) {
$fh->printf("\t\tMapping %d: %d [%s]\n", $_, $mappings->[$_], $post->{'VAL'}[$mappings->[$_]]);
}
}
1;
=head1 BUGS
None known
=head1 AUTHOR
Jonathan Kew L<Jonathan_Kew@sil.org>. See L<PDF::API2::Basic::TTF::Font> for copyright and
licensing.
=cut