+++ /dev/null
-package Font::TTF::Coverage;
-
-=head1 NAME
-
-Font::TTF::Coverage - Opentype coverage and class definition objects
-
-=head1 DESCRIPTION
-
-Coverage tables and class definition objects are virtually identical concepts
-in OpenType. Their difference comes purely in their storage. Therefore we can
-say that a coverage table is a class definition in which the class definition
-for each glyph is the corresponding index in the coverage table. The resulting
-data structure is that a Coverage table has the following fields:
-
-=item cover
-
-A boolean to indicate whether this table is a coverage table (TRUE) or a
-class definition (FALSE)
-
-=item val
-
-A hash of glyph ids against values (either coverage index or class value)
-
-=item fmt
-
-The storage format used is given here, but is recalculated when the table
-is written out.
-
-=item count
-
-A count of the elements in a coverage table for use with add. Each subsequent
-addition is added with the current count and increments the count.
-
-=head1 METHODS
-
-=cut
-
-=head2 new($isCover [, vals])
-
-Creates a new coverage table or class definition table, depending upon the
-value of $isCover. if $isCover then vals may be a list of glyphs to include in order.
-If no $isCover, then vals is a hash of glyphs against class values.
-
-=cut
-
-sub new
-{
- my ($class) = shift;
- my ($isCover) = shift;
- my ($self) = {};
-
- $self->{'cover'} = $isCover;
- $self->{'count'} = 0;
- if ($isCover)
- {
- my ($v);
- foreach $v (@_)
- { $self->{'val'}{$v} = $self->{'count'}++; }
- }
- else
- {
- $self->{'val'} = {@_};
- foreach (values %{$self->{'val'}}) {$self->{'max'} = $_ if $_ > $self->{'max'}}
- }
- bless $self, $class;
-}
-
-
-=head2 read($fh)
-
-Reads the coverage/class table from the given file handle
-
-=cut
-
-sub read
-{
- my ($self, $fh) = @_;
- my ($dat, $fmt, $num, $i, $c);
-
- $fh->read($dat, 4);
- ($fmt, $num) = unpack("n2", $dat);
- $self->{'fmt'} = $fmt;
-
- if ($self->{'cover'})
- {
- if ($fmt == 1)
- {
- $fh->read($dat, $num << 1);
- map {$self->{'val'}{$_} = $i++} unpack("n*", $dat);
- } elsif ($fmt == 2)
- {
- $fh->read($dat, $num * 6);
- for ($i = 0; $i < $num; $i++)
- {
- ($first, $last, $c) = unpack("n3", substr($dat, $i * 6, 6));
- map {$self->{'val'}{$_} = $c++} ($first .. $last);
- }
- }
- $self->{'count'} = $num;
- } elsif ($fmt == 1)
- {
- $fh->read($dat, 2);
- $first = $num;
- ($num) = unpack("n", $dat);
- $fh->read($dat, $num << 1);
- map {$self->{'val'}{$first++} = $_; $self->{'max'} = $_ if ($_ > $self->{'max'})} unpack("n*", $dat);
- } elsif ($fmt == 2)
- {
- $fh->read($dat, $num * 6);
- for ($i = 0; $i < $num; $i++)
- {
- ($first, $last, $c) = unpack("n3", substr($dat, $i * 6, 6));
- map {$self->{'val'}{$_} = $c} ($first .. $last);
- $self->{'max'} = $c if ($c > $self->{'max'});
- }
- }
- $self;
-}
-
-
-=head2 out($fh, $state)
-
-Writes the coverage/class table to the given file handle. If $state is 1 then
-the output string is returned rather than being output to a filehandle.
-
-=cut
-
-sub out
-{
- my ($self, $fh, $state) = @_;
- my ($g, $eff, $grp, $out);
- my ($shipout) = ($state ? sub {$out .= $_[0];} : sub {$fh->print($_[0]);});
- my (@gids) = sort {$a <=> $b} keys %{$self->{'val'}};
-
- $fmt = 1; $grp = 1; $eff = 0;
- for ($i = 1; $i <= $#gids; $i++)
- {
- if ($self->{'val'}{$gids[$i]} < $self->{'val'}{$gids[$i-1]} && $self->{'cover'})
- {
- $fmt = 2;
- last;
- } elsif ($gids[$i] == $gids[$i-1] + 1 && ($self->{'cover'} || $self->{'val'}{$gids[$i]} == $self->{'val'}{$gids[$i-1]}))
- { $eff++; }
- else
- {
- $grp++;
- $eff += $gids[$i] - $gids[$i-1] if (!$self->{'cover'});
- }
- }
-# if ($self->{'cover'})
- { $fmt = 2 if ($eff / $grp > 3); }
-# else
-# { $fmt = 2 if ($grp > 1); }
-
- if ($fmt == 1 && $self->{'cover'})
- {
- my ($last) = 0;
- &$shipout(pack('n2', 1, scalar @gids));
- &$shipout(pack('n*', @gids));
- } elsif ($fmt == 1)
- {
- my ($last) = $gids[0];
- &$shipout(pack("n3", 1, $last, $gids[-1] - $last + 1));
- foreach $g (@gids)
- {
- if ($g > $last + 1)
- { &$shipout(pack('n*', (0) x ($g - $last - 1))); }
- &$shipout(pack('n', $self->{'val'}{$g}));
- $last = $g;
- }
- } else
- {
- my ($start, $end, $ind, $numloc, $endloc, $num);
- &$shipout(pack("n2", 2, 0));
- $numloc = $fh->tell() - 2 unless $state;
-
- $start = 0; $end = 0; $num = 0;
- while ($end < $#gids)
- {
- if ($gids[$end + 1] == $gids[$end] + 1
- && $self->{'val'}{$gids[$end + 1]}
- == $self->{'val'}{$gids[$end]}
- + ($self->{'cover'} ? 1 : 0))
- {
- $end++;
- next;
- }
-
- &$shipout(pack("n3", $gids[$start], $gids[$end],
- $self->{'val'}{$gids[$start]}));
- $start = $end + 1;
- $end++;
- $num++;
- }
- &$shipout(pack("n3", $gids[$start], $gids[$end],
- $self->{'val'}{$gids[$start]}));
- $num++;
- if ($state)
- { substr($out, 2, 2) = pack('n', $num); }
- else
- {
- $endloc = $fh->tell();
- $fh->seek($numloc, 0);
- $fh->print(pack("n", $num));
- $fh->seek($endloc, 0);
- }
- }
- return ($state ? $out : $self);
-}
-
-
-=head2 $c->add($glyphid[, $class])
-
-Adds a glyph id to the coverage table incrementing the count so that each subsequent addition
-has the next sequential number. Returns the index number of the glyphid added
-
-=cut
-
-sub add
-{
- my ($self, $gid, $class) = @_;
-
- return $self->{'val'}{$gid} if (defined $self->{'val'}{$gid});
- if ($self->{'cover'})
- {
- $self->{'val'}{$gid} = $self->{'count'};
- return $self->{'count'}++;
- }
- else
- {
- $self->{'val'}{$gid} = $class || '0';
- $self->{'max'} = $class if ($class > $self->{'max'});
- return $class;
- }
-}
-
-
-=head2 $c->signature
-
-Returns a vector of all the glyph ids covered by this coverage table or class
-
-=cut
-
-sub signature
-{
- my ($self) = @_;
- my ($vec, $range, $size);
-
-if (0)
-{
- if ($self->{'cover'})
- { $range = 1; $size = 1; }
- else
- {
- $range = $self->{'max'};
- $size = 1;
- while ($range > 1)
- {
- $size = $size << 1;
- $range = $range >> 1;
- }
- $range = $self->{'max'} + 1;
- }
- foreach (keys %{$self->{'val'}})
- { vec($vec, $_, $size) = $self->{'val'}{$_} > $range ? $range : $self->{'val'}{$_}; }
- length($vec) . ":" . $vec;
-}
- $vec = join(";", map{"$_,$self->{'val'}{$_}"} keys %{$self->{'val'}});
-}
-
-=head2 @map=$c->sort
-
-Sorts the coverage table so that indexes are in ascending order of glyphid.
-Returns a map such that $map[$new_index]=$old_index.
-
-=cut
-
-sub sort
-{
- my ($self) = @_;
- my (@res, $i);
-
- foreach (sort {$a <=> $b} keys %{$self->{'val'}})
- {
- push(@res, $self->{'val'}{$_});
- $self->{'val'}{$_} = $i++;
- }
- @res;
-}
-
-=head2 $c->out_xml($context)
-
-Outputs this coverage/class in XML
-
-=cut
-
-sub out_xml
-{
- my ($self, $context, $depth) = @_;
- my ($fh) = $context->{'fh'};
-
- $fh->print("$depth<" . ($self->{'cover'} ? 'coverage' : 'class') . ">\n");
- foreach $gid (sort {$a <=> $b} keys %{$self->{'val'}})
- {
- $fh->printf("$depth$context->{'indent'}<gref glyph='%s' val='%s'/>\n", $gid, $self->{'val'}{$gid});
- }
- $fh->print("$depth</" . ($self->{'cover'} ? 'coverage' : 'class') . ">\n");
- $self;
-}
-
-sub release
-{ }
-
-
-=head1 AUTHOR
-
-Martin Hosken Martin_Hosken@sil.org. See L<Font::TTF::Font> for copyright and
-licensing.
-
-=cut
-
-1;
-
fnp / librarian.git / blobdiff