--- /dev/null
+package Font::TTF::OldCmap;
+
+=head1 NAME
+
+Font::TTF::OldCmap - Character map table
+
+This module is deprecated
+
+=head1 DESCRIPTION
+
+Looks after the character map. The primary structure used for handling a cmap
+is the L<Font::TTF::Segarr> which handles the segmented arrays of format 4 tables,
+and in a simpler form for format 0 tables.
+
+Due to the complexity of working with segmented arrays, most of the handling of
+such arrays is via methods rather than via instance variables.
+
+One important feature of a format 4 table is that it always contains a segment
+with a final address of 0xFFFF. If you are creating a table from scratch this is
+important (although L<Font::TTF::Segarr> can work quite happily without it).
+
+
+=head1 INSTANCE VARIABLES
+
+The instance variables listed here are not preceeded by a space due to their
+emulating structural information in the font.
+
+=over 4
+
+=item Num
+
+Number of subtables in this table
+
+=item Tables
+
+An array of subtables ([0..Num-1])
+
+=back
+
+Each subtables also has its own instance variables which are, again, not
+preceeded by a space.
+
+=over 4
+
+=item Platform
+
+The platform number for this subtable
+
+=item Encoding
+
+The encoding number for this subtable
+
+=item Format
+
+Gives the stored format of this subtable
+
+=item Ver
+
+Gives the version (or language) information for this subtable
+
+=item val
+
+This points to a L<Font::TTF::Segarr> which contains the content of the particular
+subtable.
+
+=back
+
+=head1 METHODS
+
+=cut
+
+use strict;
+use vars qw(@ISA);
+require Font::TTF::Table;
+require Font::TTF::Segarr;
+
+@ISA = qw(Font::TTF::Table);
+
+
+=head2 $t->read
+
+Reads the cmap into memory. Format 4 subtables read the whole subtable and
+fill in the segmented array accordingly.
+
+Format 2 subtables are not read at all.
+
+=cut
+
+sub read
+{
+ my ($self) = @_;
+ my ($dat, $i, $j, $k, $id, @ids, $s);
+ my ($start, $end, $range, $delta, $form, $len, $num, $ver);
+ my ($fh) = $self->{' INFILE'};
+
+ $self->SUPER::read or return $self;
+ $fh->read($dat, 4);
+ $self->{'Num'} = unpack("x2n", $dat);
+ $self->{'Tables'} = [];
+ for ($i = 0; $i < $self->{'Num'}; $i++)
+ {
+ $s = {};
+ $fh->read($dat, 8);
+ ($s->{'Platform'}, $s->{'Encoding'}, $s->{'LOC'}) = (unpack("nnN", $dat));
+ $s->{'LOC'} += $self->{' OFFSET'};
+ push(@{$self->{'Tables'}}, $s);
+ }
+ for ($i = 0; $i < $self->{'Num'}; $i++)
+ {
+ $s = $self->{'Tables'}[$i];
+ $fh->seek($s->{'LOC'}, 0);
+ $fh->read($dat, 6);
+ ($form, $len, $ver) = (unpack("n3", $dat));
+
+ $s->{'Format'} = $form;
+ $s->{'Ver'} = $ver;
+ if ($form == 0)
+ {
+ $s->{'val'} = Font::TTF::Segarr->new;
+ $fh->read($dat, 256);
+ $s->{'val'}->fastadd_segment(0, 2, unpack("C*", $dat));
+ $s->{'Start'} = 0;
+ $s->{'Num'} = 256;
+ } elsif ($form == 6)
+ {
+ my ($start, $ecount);
+
+ $fh->read($dat, 4);
+ ($start, $ecount) = unpack("n2", $dat);
+ $fh->read($dat, $ecount << 1);
+ $s->{'val'} = Font::TTF::Segarr->new;
+ $s->{'val'}->fastadd_segment($start, 2, unpack("n*", $dat));
+ $s->{'Start'} = $start;
+ $s->{'Num'} = $ecount;
+ } elsif ($form == 2)
+ {
+# no idea what to do here yet
+ } elsif ($form == 4)
+ {
+ $fh->read($dat, 8);
+ $num = unpack("n", $dat);
+ $num >>= 1;
+ $fh->read($dat, $len - 14);
+ $s->{'val'} = Font::TTF::Segarr->new;
+ for ($j = 0; $j < $num; $j++)
+ {
+ $end = unpack("n", substr($dat, $j << 1, 2));
+ $start = unpack("n", substr($dat, ($j << 1) + ($num << 1) + 2, 2));
+ $delta = unpack("n", substr($dat, ($j << 1) + ($num << 2) + 2, 2));
+ $delta -= 65536 if $delta > 32767;
+ $range = unpack("n", substr($dat, ($j << 1) + $num * 6 + 2, 2));
+ @ids = ();
+ for ($k = $start; $k <= $end; $k++)
+ {
+ if ($range == 0)
+ { $id = $k + $delta; }
+ else
+ { $id = unpack("n", substr($dat, ($j << 1) + $num * 6 +
+ 2 + ($k - $start) * 2 + $range, 2)) + $delta; }
+ $id -= 65536 if $id > 65536;
+ push (@ids, $id);
+ }
+ $s->{'val'}->fastadd_segment($start, 0, @ids);
+ }
+ $s->{'val'}->tidy;
+ $s->{'Num'} = 0x10000; # always ends here
+ $s->{'Start'} = $s->{'val'}[0]{'START'};
+ }
+ }
+ $self;
+}
+
+
+=head2 $t->ms_lookup($uni)
+
+Given a Unicode value in the MS table (Platform 3, Encoding 1) locates that
+table and looks up the appropriate glyph number from it.
+
+=cut
+
+sub ms_lookup
+{
+ my ($self, $uni) = @_;
+
+ $self->find_ms || return undef unless (defined $self->{' mstable'});
+ return $self->{' mstable'}{'val'}->at($uni);
+}
+
+
+=head2 $t->find_ms
+
+Finds the Microsoft Unicode table and sets the C<mstable> instance variable
+to it if found. Returns the table it finds.
+
+=cut
+sub find_ms
+{
+ my ($self) = @_;
+ my ($i, $s, $alt);
+
+ return $self->{' mstable'} if defined $self->{' mstable'};
+ $self->read;
+ for ($i = 0; $i < $self->{'Num'}; $i++)
+ {
+ $s = $self->{'Tables'}[$i];
+ if ($s->{'Platform'} == 3)
+ {
+ $self->{' mstable'} = $s;
+ last if ($s->{'Encoding'} == 1);
+ } elsif ($s->{'Platform'} == 0 || ($s->{'Platform'} == 2 && $s->{'Encoding'} == 1))
+ { $self->{' mstable'} = $s; }
+ }
+ $self->{' mstable'};
+}
+
+
+=head2 $t->out($fh)
+
+Writes out a cmap table to a filehandle. If it has not been read, then
+just copies from input file to output
+
+=cut
+
+sub out
+{
+ my ($self, $fh) = @_;
+ my ($loc, $s, $i, $base_loc, $j);
+
+ return $self->SUPER::out($fh) unless $self->{' read'};
+
+ $base_loc = $fh->tell();
+ $fh->print(pack("n2", 0, $self->{'Num'}));
+
+ for ($i = 0; $i < $self->{'Num'}; $i++)
+ { $fh->print(pack("nnN", $self->{'Tables'}[$i]{'Platform'}, $self->{'Tables'}[$i]{'Encoding'}, 0)); }
+
+ for ($i = 0; $i < $self->{'Num'}; $i++)
+ {
+ $s = $self->{'Tables'}[$i];
+ $s->{'val'}->tidy;
+ $s->{' outloc'} = $fh->tell();
+ $fh->print(pack("n3", $s->{'Format'}, 0, $s->{'Ver'})); # come back for length
+ if ($s->{'Format'} == 0)
+ {
+ $fh->print(pack("C256", $s->{'val'}->at(0, 256)));
+ } elsif ($s->{'Format'} == 6)
+ {
+ $fh->print(pack("n2", $s->{'Start'}, $s->{'Num'}));
+ $fh->print(pack("n*", $s->{'val'}->at($s->{'Start'}, $s->{'Num'})));
+ } elsif ($s->{'Format'} == 2)
+ {
+ } elsif ($s->{'Format'} == 4)
+ {
+ my ($num, $sRange, $eSel);
+ my (@deltas, $delta, @range, $flat, $k, $segs, $count);
+
+ $num = $#{$s->{'val'}} + 1;
+ $segs = $s->{'val'};
+ for ($sRange = 1, $eSel = 0; $sRange <= $num; $eSel++)
+ { $sRange <<= 1;}
+ $eSel--;
+ $fh->print(pack("n4", $num * 2, $sRange, $eSel, ($num * 2) - $sRange));
+ $fh->print(pack("n*", map {$_->{'START'} + $_->{'LEN'} - 1} @$segs));
+ $fh->print(pack("n", 0));
+ $fh->print(pack("n*", map {$_->{'START'}} @$segs));
+
+ for ($j = 0; $j < $num; $j++)
+ {
+ $delta = $segs->[$j]{'VAL'}[0]; $flat = 1;
+ for ($k = 1; $k < $segs->[$j]{'LEN'}; $k++)
+ {
+ if ($segs->[$j]{'VAL'}[$k] == 0)
+ { $flat = 0; }
+ if ($delta + $k != $segs->[$j]{'VAL'}[$k])
+ {
+ $delta = 0;
+ last;
+ }
+ }
+ push (@range, $flat);
+ push (@deltas, ($delta ? $delta - $segs->[$j]{'START'} : 0));
+ }
+ $fh->print(pack("n*", @deltas));
+
+ $count = 0;
+ for ($j = 0; $j < $num; $j++)
+ {
+ $delta = $deltas[$j];
+ if ($delta != 0 && $range[$j] == 1)
+ { $range[$j] = 0; }
+ else
+ {
+ $range[$j] = ($count + $num - $j) << 1;
+ $count += $segs->[$j]{'LEN'};
+ }
+ }
+
+ $fh->print(pack("n*", @range));
+
+ for ($j = 0; $j < $num; $j++)
+ {
+ next if ($range[$j] == 0);
+ for ($k = 0; $k < $segs->[$j]{'LEN'}; $k++)
+ { $fh->print(pack("n", $segs->[$j]{'VAL'}[$k])); }
+ }
+ }
+
+ $loc = $fh->tell();
+ $fh->seek($s->{' outloc'} + 2, 0);
+ $fh->print(pack("n", $loc - $s->{' outloc'}));
+ $fh->seek($base_loc + 8 + ($i << 3), 0);
+ $fh->print(pack("N", $s->{' outloc'} - $base_loc));
+ $fh->seek($loc, 0);
+ }
+ $self;
+}
+
+
+=head2 @map = $t->reverse([$num])
+
+Returns a reverse map of the table of given number or the Microsoft
+cmap. I.e. given a glyph gives the Unicode value for it.
+
+=cut
+
+sub reverse
+{
+ my ($self, $tnum) = @_;
+ my ($table) = defined $tnum ? $self->{'Tables'}[$tnum] : $self->find_ms;
+ my (@res, $i, $s, $first);
+
+ foreach $s (@{$table->{'val'}})
+ {
+ $first = $s->{'START'};
+ map {$res[$_] = $first unless $res[$_]; $first++;} @{$s->{'VAL'}};
+ }
+ @res;
+}
+
+1;
+
+=head1 BUGS
+
+=over 4
+
+=item *
+
+No support for format 2 tables (MBCS)
+
+=back
+
+=head1 AUTHOR
+
+Martin Hosken Martin_Hosken@sil.org. See L<Font::TTF::Font> for copyright and
+licensing.
+
+=cut
+
fnp / librarian.git / blobdiff