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 preceded 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
preceded 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) = @_;
$self->SUPER::read or return $self;
my ($dat, $i, $j, $k, $id, @ids, $s);
my ($start, $end, $range, $delta, $form, $len, $num, $ver);
my ($fh) = $self->{' INFILE'};
$fh->read($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 L<http://scripts.sil.org/FontUtils>.
=head1 LICENSING
Copyright (c) 1998-2016, SIL International (http://www.sil.org)
This module is released under the terms of the Artistic License 2.0.
For details, see the full text of the license in the file LICENSE.
=cut