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package Font::TTF::Glyf;
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=head1 NAME
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Font::TTF::Glyf - The Glyf data table
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=head1 DESCRIPTION
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This is a stub table. The real data is held in the loca table. If you want to get a glyf
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look it up in the loca table as C<$f->{'loca'}{'glyphs'}[$num]>. It will not be here!
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The difference between reading this table as opposed to the loca table is that
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reading this table will cause updated glyphs to be written out rather than just
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copying the glyph information from the input file. This causes font writing to be
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slower. So read the glyf as opposed to the loca table if you want to change glyf
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data. Read the loca table only if you are just wanting to read the glyf information.
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This class is used when writing the glyphs though.
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=head1 METHODS
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=cut
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use strict;
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use vars qw(@ISA);
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@ISA = qw(Font::TTF::Table);
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=head2 $t->read
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Reads the C<loca> table instead!
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=cut
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sub read
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{
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my ($self) = @_;
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$self->{' PARENT'}{'loca'}->read;
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$self->{' read'} = 1;
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$self;
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}
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# Internal function called by loca -- decompresses WOFF data if needed.
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sub _read
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{
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my ($self) = @_;
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$self->SUPER::read or return $self;
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# Nothing else to do
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$self;
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}
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=head2 $t->out($fh)
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Writes out all the glyphs in the parent's location table, calculating a new
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output location for each one.
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=cut
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# ' match for syntax coloring
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sub out
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{
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my ($self, $fh) = @_;
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my ($i, $loca, $offset, $numGlyphs);
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return $self->SUPER::out($fh) unless $self->{' read'};
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$loca = $self->{' PARENT'}{'loca'}{'glyphs'};
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$numGlyphs = $self->{' PARENT'}{'maxp'}{'numGlyphs'};
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$offset = 0;
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for ($i = 0; $i < $numGlyphs; $i++)
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{
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next unless defined $loca->[$i];
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$loca->[$i]->update;
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$loca->[$i]{' OUTLOC'} = $offset;
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$loca->[$i]->out($fh);
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$offset += $loca->[$i]{' OUTLEN'};
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}
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$self->{' PARENT'}{'head'}{'indexToLocFormat'} = ($offset >= 0x20000);
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$self;
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}
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=head2 $t->out_xml($context, $depth)
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Outputs all the glyphs in the glyph table just where they are supposed to be output!
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=cut
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sub out_xml
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{
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my ($self, $context, $depth) = @_;
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my ($fh) = $context->{'fh'};
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my ($loca, $i, $numGlyphs);
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$loca = $self->{' PARENT'}{'loca'}{'glyphs'};
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$numGlyphs = $self->{' PARENT'}{'maxp'}{'numGlyphs'};
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for ($i = 0; $i < $numGlyphs; $i++)
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{
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$context->{'gid'} = $i;
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$loca->[$i]->out_xml($context, $depth) if (defined $loca->[$i]);
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}
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$self;
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}
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=head2 $t->XML_start($context, $tag, %attrs)
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Pass control to glyphs as they occur
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=cut
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sub XML_start
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{
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my ($self) = shift;
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my ($context, $tag, %attrs) = @_;
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if ($tag eq 'glyph')
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{
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$context->{'tree'}[-1] = Font::TTF::Glyph->new(read => 2, PARENT => $self->{' PARENT'});
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$context->{'receiver'} = $context->{'tree'}[-1];
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}
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}
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=head2 $t->XML_end($context, $tag, %attrs)
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Collect up glyphs and put them into the loca table
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=cut
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sub XML_end
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{
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my ($self) = shift;
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my ($context, $tag, %attrs) = @_;
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if ($tag eq 'glyph')
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{
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unless (defined $context->{'glyphs'})
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{
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if (defined $self->{' PARENT'}{'loca'})
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{ $context->{'glyphs'} = $self->{' PARENT'}{'loca'}{'glyphs'}; }
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else
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{ $context->{'glyphs'} = []; }
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}
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$context->{'glyphs'}[$attrs{'gid'}] = $context->{'tree'}[-1];
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return $context;
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} else
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{ return $self->SUPER::XML_end(@_); }
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}
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1;
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=head1 BUGS
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None known
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=head1 AUTHOR
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Martin Hosken L<http://scripts.sil.org/FontUtils>.
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=head1 LICENSING
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Copyright (c) 1998-2016, SIL International (http://www.sil.org)
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This module is released under the terms of the Artistic License 2.0.
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For details, see the full text of the license in the file LICENSE.
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=cut
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