#=======================================================================
# ____ ____ _____ _ ____ ___ ____
# | _ \| _ \| ___| _ _ / \ | _ \_ _| |___ \
# | |_) | | | | |_ (_) (_) / _ \ | |_) | | __) |
# | __/| |_| | _| _ _ / ___ \| __/| | / __/
# |_| |____/|_| (_) (_) /_/ \_\_| |___| |_____|
#
# 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: Ligature.pm,v 2.0 2005/11/16 02:16:00 areibens Exp $
#
#=======================================================================
=head1 NAME
PDF::API2::Basic::TTF::Mort::Ligature
=head1 METHODS
=cut
use strict;
use vars qw(@ISA);
@ISA = qw(PDF::API2::Basic::TTF::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, 0);
$fh->seek($stateTableStart, IO::File::SEEK_SET);
$fh->read($dat, 14);
my ($stateSize, $classTable, $stateArray, $entryTable,
$ligActionTable, $componentTable, $ligatureTable) = unpack("nnnnnnn", $dat);
my $limits = [$classTable, $stateArray, $entryTable, $ligActionTable, $componentTable, $ligatureTable, $self->{'length'} - 8];
my %actions;
my $actionLists;
foreach (@$entries) {
my $offset = $_->{'flags'} & 0x3fff;
$_->{'flags'} &= ~0x3fff;
if ($offset != 0) {
if (not defined $actions{$offset}) {
$fh->seek($stateTableStart + $offset, IO::File::SEEK_SET);
my $actionList;
while (1) {
$fh->read($dat, 4);
my $action = unpack("N", $dat);
my ($last, $store, $component) = (($action & 0x80000000) != 0, ($action & 0xC0000000) != 0, ($action & 0x3fffffff));
$component -= 0x40000000 if $component > 0x1fffffff;
$component -= $componentTable / 2;
push @$actionList, { 'store' => $store, 'component' => $component };
last if $last;
}
push @$actionLists, $actionList;
$actions{$offset} = $#$actionLists;
}
$_->{'actions'} = $actions{$offset};
}
}
$self->{'componentTable'} = $componentTable;
my $components = [unpack("n*", AAT_read_subtable($fh, $stateTableStart, $componentTable, $limits))];
foreach (@$components) {
$_ = ($_ - $ligatureTable) . " +" if $_ >= $ligatureTable;
}
$self->{'components'} = $components;
$self->{'ligatureTable'} = $ligatureTable;
$self->{'ligatures'} = [unpack("n*", AAT_read_subtable($fh, $stateTableStart, $ligatureTable, $limits))];
$self->{'classes'} = $classes;
$self->{'states'} = $states;
$self->{'actionLists'} = $actionLists;
$self;
}
=head2 $t->pack_sub($fh)
=cut
sub pack_sub
{
my ($self) = @_;
my ($dat);
$dat .= pack("nnnnnnn", (0) x 7); # placeholders for stateSize, classTable, stateArray, entryTable, actionLists, components, ligatures
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 {
( $_->{'flags'} & 0xc000, $_->{'actions'} )
}
);
$dat .= $dat1;
my $actionLists = $self->{'actionLists'};
my %actionListOffset;
my $actionListDataLength = 0;
my @actionListEntries;
foreach (0 .. $#$entries) {
my ($nextState, $flags, $offset) = split(/,/, $entries->[$_]);
if ($offset eq "") {
$offset = undef;
}
else {
if (defined $actionListOffset{$offset}) {
$offset = $actionListOffset{$offset};
}
else {
$actionListOffset{$offset} = $actionListDataLength;
my $list = $actionLists->[$offset];
$actionListDataLength += 4 * @$list;
push @actionListEntries, $list;
$offset = $actionListOffset{$offset};
}
}
$entries->[$_] = [ $nextState, $flags, $offset ];
}
my $entryTable = length($dat);
my $ligActionLists = ($entryTable + @$entries * 4 + 3) & ~3;
foreach (@$entries) {
$_->[2] += $ligActionLists if defined $_->[2];
$dat .= pack("nn", $_->[0], $_->[1] + $_->[2]);
}
$dat .= pack("C*", (0) x ($ligActionLists - $entryTable - @$entries * 4));
die "internal error" unless length($dat) == $ligActionLists;
my $componentTable = length($dat) + $actionListDataLength;
my $actionList;
foreach $actionList (@actionListEntries) {
foreach (0 .. $#$actionList) {
my $action = $actionList->[$_];
my $val = $action->{'component'} + $componentTable / 2;
$val += 0x40000000 if $val < 0;
$val &= 0x3fffffff;
$val |= 0x40000000 if $action->{'store'};
$val |= 0x80000000 if $_ == $#$actionList;
$dat .= pack("N", $val);
}
}
die "internal error" unless length($dat) == $componentTable;
my $components = $self->{'components'};
my $ligatureTable = $componentTable + @$components * 2;
$dat .= pack("n*", map { (index($_, '+') >= 0 ? $ligatureTable : 0) + $_ } @$components);
my $ligatures = $self->{'ligatures'};
$dat .= pack("n*", @$ligatures);
$dat1 = pack("nnnnnnn", $stateSize, $classTable, $stateArray, $entryTable, $ligActionLists, $componentTable, $ligatureTable);
substr($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);
$fh->printf("\t(%s%d,%s)", $flags, $_->{'nextState'}, defined $_->{'actions'} ? $_->{'actions'} : "=");
}
$fh->print("\n");
}
$fh->print("\n");
my $actionLists = $self->{'actionLists'};
foreach (0 .. $#$actionLists) {
$fh->printf("\t\tList %d:\t", $_);
my $actionList = $actionLists->[$_];
$fh->printf("%s\n", join(", ", map { ($_->{'component'} . ($_->{'store'} ? "*" : "") ) } @$actionList));
}
my $ligatureTable = $self->{'ligatureTable'};
$fh->print("\n");
my $components = $self->{'components'};
foreach (0 .. $#$components) {
$fh->printf("\t\tComponent %d: %s\n", $_, $components->[$_]);
}
$fh->print("\n");
my $ligatures = $self->{'ligatures'};
foreach (0 .. $#$ligatures) {
$fh->printf("\t\tLigature %d: %d [%s]\n", $_, $ligatures->[$_], $post->{'VAL'}[$ligatures->[$_]]);
}
}
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