X-Git-Url: https://git.mdrn.pl/librarian.git/blobdiff_plain/e316fc14bef26f958937aec0e6854b61f71a3b34..09dded3d8606e8e4406fffcf477ceb4a1c97fee2:/librarian/font-optimizer/ext/Font-TTF/lib/Font/TTF/Mort/Chain.pm

diff --git a/librarian/font-optimizer/ext/Font-TTF/lib/Font/TTF/Mort/Chain.pm b/librarian/font-optimizer/ext/Font-TTF/lib/Font/TTF/Mort/Chain.pm
new file mode 100644
index 0000000..b8e7b93
--- /dev/null
+++ b/librarian/font-optimizer/ext/Font-TTF/lib/Font/TTF/Mort/Chain.pm
@@ -0,0 +1,196 @@
+package Font::TTF::Mort::Chain;
+
+=head1 NAME
+
+Font::TTF::Mort::Chain - Chain Mort subtable for AAT
+
+=cut
+
+use strict;
+use Font::TTF::Utils;
+use Font::TTF::AATutils;
+use Font::TTF::Mort::Subtable;
+use IO::File;
+
+=head2 $t->new
+
+=cut
+
+sub new
+{
+    my ($class, %parms) = @_;
+    my ($self) = {};
+    my ($p);
+
+    $class = ref($class) || $class;
+    foreach $p (keys %parms)
+    { $self->{" $p"} = $parms{$p}; }
+    bless $self, $class;
+}
+
+=head2 $t->read($fh)
+
+Reads the chain into memory
+
+=cut
+
+sub read
+{
+    my ($self, $fh) = @_;
+    my ($dat);
+
+    my $chainStart = $fh->tell();
+    $fh->read($dat, 12);
+    my ($defaultFlags, $chainLength, $nFeatureEntries, $nSubtables) = TTF_Unpack("LLSS", $dat);
+
+    my $featureEntries = [];
+    foreach (1 .. $nFeatureEntries) {
+        $fh->read($dat, 12);
+        my ($featureType, $featureSetting, $enableFlags, $disableFlags) = TTF_Unpack("SSLL", $dat);
+        push @$featureEntries,    {
+                                    'type'        => $featureType,
+                                    'setting'    => $featureSetting,
+                                    'enable'    => $enableFlags,
+                                    'disable'    => $disableFlags
+                                };
+    }
+
+    my $subtables = [];
+    foreach (1 .. $nSubtables) {
+        my $subtableStart = $fh->tell();
+        
+        $fh->read($dat, 8);
+        my ($length, $coverage, $subFeatureFlags) = TTF_Unpack("SSL", $dat);
+        my $type = $coverage & 0x0007;
+
+        my $subtable = Font::TTF::Mort::Subtable->create($type, $coverage, $subFeatureFlags, $length);
+        $subtable->read($fh);
+        $subtable->{' PARENT'} = $self;
+        
+        push @$subtables, $subtable;
+        $fh->seek($subtableStart + $length, IO::File::SEEK_SET);
+    }
+    
+    $self->{'defaultFlags'} = $defaultFlags;
+    $self->{'featureEntries'} = $featureEntries;
+    $self->{'subtables'} = $subtables;
+
+    $fh->seek($chainStart + $chainLength, IO::File::SEEK_SET);
+
+    $self;
+}
+
+=head2 $t->out($fh)
+
+Writes the table to a file either from memory or by copying
+
+=cut
+
+sub out
+{
+    my ($self, $fh) = @_;
+    
+    my $chainStart = $fh->tell();
+    my ($featureEntries, $subtables) = ($_->{'featureEntries'}, $_->{'subtables'});
+    $fh->print(TTF_Pack("LLSS", $_->{'defaultFlags'}, 0, scalar @$featureEntries, scalar @$subtables)); # placeholder for length
+    
+    foreach (@$featureEntries) {
+        $fh->print(TTF_Pack("SSLL", $_->{'type'}, $_->{'setting'}, $_->{'enable'}, $_->{'disable'}));
+    }
+    
+    foreach (@$subtables) {
+        $_->out($fh);
+    }
+    
+    my $chainLength = $fh->tell() - $chainStart;
+    $fh->seek($chainStart + 4, IO::File::SEEK_SET);
+    $fh->print(pack("N", $chainLength));
+    $fh->seek($chainStart + $chainLength, IO::File::SEEK_SET);
+}
+
+=head2 $t->print($fh)
+
+Prints a human-readable representation of the chain
+
+=cut
+
+sub feat
+{
+    my ($self) = @_;
+    
+    my $feat = $self->{' PARENT'}{' PARENT'}{'feat'};
+    if (defined $feat) {
+        $feat->read;
+    }
+    else {
+        $feat = {};
+    }
+    
+    return $feat;
+}
+
+sub print
+{
+    my ($self, $fh) = @_;
+    
+    $fh->printf("version %f\n", $self->{'version'});
+    
+    my $defaultFlags = $self->{'defaultFlags'};
+    $fh->printf("chain: defaultFlags = %08x\n", $defaultFlags);
+    
+    my $feat = $self->feat();
+    my $featureEntries = $self->{'featureEntries'};
+    foreach (@$featureEntries) {
+        $fh->printf("\tfeature %d, setting %d : enableFlags = %08x, disableFlags = %08x # '%s: %s'\n",
+                    $_->{'type'}, $_->{'setting'}, $_->{'enable'}, $_->{'disable'},
+                    $feat->settingName($_->{'type'}, $_->{'setting'}));
+    }
+    
+    my $subtables = $self->{'subtables'};
+    foreach (@$subtables) {
+        my $type = $_->{'type'};
+        my $subFeatureFlags = $_->{'subFeatureFlags'};
+        $fh->printf("\n\t%s table, %s, %s, subFeatureFlags = %08x # %s (%s)\n",
+                    subtable_type_($type), $_->{'direction'}, $_->{'orientation'}, $subFeatureFlags,
+                    "Default " . ((($subFeatureFlags & $defaultFlags) != 0) ? "On" : "Off"),
+                    join(", ",
+                        map {
+                            join(": ", $feat->settingName($_->{'type'}, $_->{'setting'}) )
+                        } grep { ($_->{'enable'} & $subFeatureFlags) != 0 } @$featureEntries
+                    ) );
+        
+        $_->print($fh);
+    }
+}
+
+sub subtable_type_
+{
+    my ($val) = @_;
+    my ($res);
+    
+    my @types =    (
+                    'Rearrangement',
+                    'Contextual',
+                    'Ligature',
+                    undef,
+                    'Non-contextual',
+                    'Insertion',
+                );
+    $res = $types[$val] or ('Undefined (' . $val . ')');
+    
+    $res;
+}
+
+1;
+
+=head1 BUGS
+
+None known
+
+=head1 AUTHOR
+
+Jonathan Kew L<Jonathan_Kew@sil.org>. See L<Font::TTF::Font> for copyright and
+licensing.
+
+=cut
+