+++ /dev/null
-package Font::TTF::Loca;
-
-=head1 NAME
-
-Font::TTF::Loca - the Locations table, which is intimately tied to the glyf table
-
-=head1 DESCRIPTION
-
-The location table holds the directory of locations of each glyph within the
-glyf table. Due to this relationship and the unimportance of the actual locations
-when it comes to holding glyphs in memory, reading the location table results
-in the creation of glyph objects for each glyph and stores them here.
-So if you are looking for glyphs, don't look in the C<glyf> table, look here
-instead.
-
-Things get complicated if you try to change the glyph list within the one table.
-The recommendation is to create another clean location object to replace this
-table in the font, ensuring that the old table is read first and to transfer
-or copy glyphs across from the read table to the new table.
-
-=head1 INSTANCE VARIABLES
-
-The instance variables do not start with a space
-
-=over 4
-
-=item glyphs
-
-An array of glyph objects for each glyph.
-
-=item glyphtype
-
-A string containing the class name to create for each new glyph. If empty,
-defaults to L<Font::TTF::Glyph>.
-
-=back
-
-=head1 METHODS
-
-=cut
-
-use strict;
-use vars qw(@ISA);
-@ISA = qw(Font::TTF::Table);
-
-require Font::TTF::Glyph;
-
-
-=head2 $t->new
-
-Creates a new location table making sure it has a glyphs array
-
-=cut
-
-sub new
-{
- my ($class) = shift;
- my ($res) = $class->SUPER::new(@_);
- $res->{'glyphs'} = [];
- $res;
-}
-
-=head2 $t->read
-
-Reads the location table creating glyph objects (L<Font::TTF::Glyph>) for each glyph
-allowing their later reading.
-
-=cut
-
-sub read
-{
- my ($self) = @_;
- my ($fh) = $self->{' INFILE'};
- my ($locFmt) = $self->{' PARENT'}{'head'}{'indexToLocFormat'};
- my ($numGlyphs) = $self->{' PARENT'}{'maxp'}{'numGlyphs'};
- my ($glyfLoc) = $self->{' PARENT'}{'glyf'}{' OFFSET'};
- my ($dat, $last, $i, $loc);
-
- $self->SUPER::read or return $self;
- $fh->read($dat, $locFmt ? 4 : 2);
- $last = unpack($locFmt ? "N" : "n", $dat);
- for ($i = 0; $i < $numGlyphs; $i++)
- {
- $fh->read($dat, $locFmt ? 4 : 2);
- $loc = unpack($locFmt ? "N" : "n", $dat);
- $self->{'glyphs'}[$i] = ($self->{'glyphtype'} || "Font::TTF::Glyph")->new(
- LOC => $last << ($locFmt ? 0 : 1),
- OUTLOC => $last << ($locFmt ? 0 : 1),
- PARENT => $self->{' PARENT'},
- INFILE => $fh,
- BASE => $glyfLoc,
- OUTLEN => ($loc - $last) << ($locFmt ? 0 : 1),
- LEN => ($loc - $last) << ($locFmt ? 0 : 1)) if ($loc != $last);
- $last = $loc;
- }
- $self;
-}
-
-
-=head2 $t->out($fh)
-
-Writes the location table out to $fh. Notice that not having read the location
-table implies that the glyf table has not been read either, so the numbers in
-the location table are still valid. Let's hope that C<maxp/numGlyphs> and
-C<head/indexToLocFmt> haven't changed otherwise we are in big trouble.
-
-The function uses the OUTLOC location in the glyph calculated when the glyf
-table was attempted to be output.
-
-=cut
-
-sub out
-{
- my ($self, $fh) = @_;
- my ($locFmt) = $self->{' PARENT'}{'head'}{'indexToLocFormat'};
- my ($numGlyphs) = $self->{' PARENT'}{'maxp'}{'numGlyphs'};
- my ($count, $i, $offset, $g);
-
- return $self->SUPER::out($fh) unless ($self->{' read'});
-
- $count = 0;
- for ($i = 0; $i < $numGlyphs; $i++)
- {
- $g = ($self->{'glyphs'}[$i]) || "";
- unless ($g)
- {
- $count++;
- next;
- } else
- {
- if ($locFmt)
- { $fh->print(pack("N", $g->{' OUTLOC'}) x ($count + 1)); }
- else
- { $fh->print(pack("n", $g->{' OUTLOC'} >> 1) x ($count + 1)); }
- $count = 0;
- $offset = $g->{' OUTLOC'} + $g->{' OUTLEN'};
- }
- }
- $fh->print(pack($locFmt ? "N" : "n", ($locFmt ? $offset: $offset >> 1)) x ($count + 1));
-}
-
-
-=head2 $t->out_xml($context, $depth)
-
-No need to output a loca table, this is dynamically generated
-
-=cut
-
-sub out_xml
-{ return $_[0]; }
-
-
-=head2 $t->glyphs_do(&func)
-
-Calls func for each glyph in this location table in numerical order:
-
- &func($glyph, $glyph_num)
-
-=cut
-
-sub glyphs_do
-{
- my ($self, $func) = @_;
- my ($i);
-
- for ($i = 0; $i <= $#{$self->{'glyphs'}}; $i++)
- { &$func($self->{'glyphs'}[$i], $i) if defined $self->{'glyphs'}[$i]; }
- $self;
-}
-
-1;
-
-=head1 BUGS
-
-None known
-
-=head1 AUTHOR
-
-Martin Hosken Martin_Hosken@sil.org. See L<Font::TTF::Font> for copyright and
-licensing.
-
-=cut
-
fnp / librarian.git / blobdiff