183 lines
3.5 KiB
Perl
183 lines
3.5 KiB
Perl
package Font::TTF::Hhea;
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=head1 NAME
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Font::TTF::Hhea - Horizontal Header table
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=head1 DESCRIPTION
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This is a simplte table with just standards specified instance variables
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=head1 INSTANCE VARIABLES
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version
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Ascender
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Descender
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LineGap
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advanceWidthMax
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minLeftSideBearing
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minRightSideBearing
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xMaxExtent
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caretSlopeRise
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caretSlopeRun
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metricDataFormat
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numberOfHMetrics
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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 %fields @field_info);
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require Font::TTF::Table;
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use Font::TTF::Utils;
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@ISA = qw(Font::TTF::Table);
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@field_info = (
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'version' => 'v',
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'Ascender' => 's',
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'Descender' => 's',
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'LineGap' => 's',
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'advanceWidthMax' => 'S',
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'minLeftSideBearing' => 's',
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'minRightSideBearing' => 's',
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'xMaxExtent' => 's',
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'caretSlopeRise' => 's',
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'caretSlopeRun' => 's',
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'metricDataFormat' => '+10s',
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'numberOfHMetrics' => 'S');
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sub init
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{
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my ($k, $v, $c, $i);
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for ($i = 0; $i < $#field_info; $i += 2)
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{
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($k, $v, $c) = TTF_Init_Fields($field_info[$i], $c, $field_info[$i + 1]);
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next unless defined $k && $k ne "";
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$fields{$k} = $v;
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}
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}
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=head2 $t->read
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Reads the table into memory as instance variables
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=cut
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sub read
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{
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my ($self) = @_;
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my ($dat);
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$self->SUPER::read or return $self;
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init unless defined $fields{'Ascender'};
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$self->{' INFILE'}->read($dat, 36);
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TTF_Read_Fields($self, $dat, \%fields);
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$self;
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}
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=head2 $t->out($fh)
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Writes the table to a file either from memory or by copying.
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=cut
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sub out
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{
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my ($self, $fh) = @_;
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return $self->SUPER::out($fh) unless $self->{' read'};
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$self->{'numberOfHMetrics'} = $self->{' PARENT'}{'hmtx'}->numMetrics || $self->{'numberOfHMetrics'};
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$fh->print(TTF_Out_Fields($self, \%fields, 36));
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$self;
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}
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=head2 $t->minsize()
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Returns the minimum size this table can be. If it is smaller than this, then the table
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must be bad and should be deleted or whatever.
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=cut
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sub minsize
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{
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return 36;
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}
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=head2 $t->update
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Updates various parameters in the hhea table from the hmtx table.
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=cut
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sub update
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{
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my ($self) = @_;
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my ($hmtx) = $self->{' PARENT'}{'hmtx'};
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my ($glyphs);
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my ($num, $res);
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my ($i, $maw, $mlsb, $mrsb, $mext, $aw, $lsb, $ext);
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return undef unless ($self->SUPER::update);
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return undef unless (defined $hmtx && defined $self->{' PARENT'}{'loca'});
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$hmtx->read->update;
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$self->{' PARENT'}{'loca'}->read->update;
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$glyphs = $self->{' PARENT'}{'loca'}{'glyphs'};
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$num = $self->{' PARENT'}{'maxp'}{'numGlyphs'};
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for ($i = 0; $i < $num; $i++)
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{
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$aw = $hmtx->{'advance'}[$i];
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$lsb = $hmtx->{'lsb'}[$i];
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if (defined $glyphs->[$i])
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{ $ext = $lsb + $glyphs->[$i]->read->{'xMax'} - $glyphs->[$i]{'xMin'}; }
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else
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{ $ext = $aw; }
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$maw = $aw if ($aw > $maw);
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$mlsb = $lsb if ($lsb < $mlsb or $i == 0);
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$mrsb = $aw - $ext if ($aw - $ext < $mrsb or $i == 0);
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$mext = $ext if ($ext > $mext);
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}
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$self->{'advanceWidthMax'} = $maw;
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$self->{'minLeftSideBearing'} = $mlsb;
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$self->{'minRightSideBearing'} = $mrsb;
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$self->{'xMaxExtent'} = $mext;
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$self->{'numberOfHMetrics'} = $hmtx->numMetrics;
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$self;
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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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