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[librarian.git] / font-optimizer / ext / Font-TTF / lib / Font / TTF / Vhea.pm

diff --git a/font-optimizer/ext/Font-TTF/lib/Font/TTF/Vhea.pm b/font-optimizer/ext/Font-TTF/lib/Font/TTF/Vhea.pm
new file mode 100644 (file)
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+++ b/font-optimizer/ext/Font-TTF/lib/Font/TTF/Vhea.pm
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+package Font::TTF::Vhea;
+
+=head1 NAME
+
+Font::TTF::Vhea - Vertical Header table
+
+=head1 DESCRIPTION
+
+This is a simple table with just standards specified instance variables
+
+=head1 INSTANCE VARIABLES
+
+    version
+    Ascender
+    Descender
+    LineGap
+    advanceHeightMax
+    minTopSideBearing
+    minBottomSideBearing
+    yMaxExtent
+    caretSlopeRise
+    caretSlopeRun
+    metricDataFormat
+    numberOfVMetrics
+
+
+=head1 METHODS
+
+=cut
+
+use strict;
+use vars qw(@ISA %fields @field_info);
+
+require Font::TTF::Table;
+use Font::TTF::Utils;
+
+@ISA = qw(Font::TTF::Table);
+@field_info = (
+    'version' => 'v',
+    'Ascender' => 's',
+    'Descender' => 's',
+    'LineGap' => 's',
+    'advanceHeightMax' => 'S',
+    'minTopSideBearing' => 's',
+    'minBottomSideBearing' => 's',
+    'yMaxExtent' => 's',
+    'caretSlopeRise' => 's',
+    'caretSlopeRun' => 's',
+    'metricDataFormat' => '+10s',
+    'numberOfVMetrics' => 's');
+
+sub init
+{
+    my ($k, $v, $c, $i);
+    for ($i = 0; $i < $#field_info; $i += 2)
+    {
+        ($k, $v, $c) = TTF_Init_Fields($field_info[$i], $c, $field_info[$i + 1]);
+        next unless defined $k && $k ne "";
+        $fields{$k} = $v;
+    }
+}
+
+
+=head2 $t->read
+
+Reads the table into memory as instance variables
+
+=cut
+
+sub read
+{
+    my ($self) = @_;
+    my ($dat);
+
+    $self->SUPER::read or return $self;
+    init unless defined $fields{'Ascender'};
+    $self->{' INFILE'}->read($dat, 36);
+
+    TTF_Read_Fields($self, $dat, \%fields);
+    $self;
+}
+
+
+=head2 $t->out($fh)
+
+Writes the table to a file either from memory or by copying.
+
+=cut
+
+sub out
+{
+    my ($self, $fh) = @_;
+
+    return $self->SUPER::out($fh) unless $self->{' read'};
+
+    $self->{'numberOfVMetrics'} = $self->{' PARENT'}{'vmtx'}->numMetrics || $self->{'numberOfVMetrics'};
+    $fh->print(TTF_Out_Fields($self, \%fields, 36));
+    $self;
+}
+
+
+=head2 $t->update
+
+Updates various parameters in the hhea table from the hmtx table, assuming
+the C<hmtx> table is dirty.
+
+=cut
+
+sub update
+{
+    my ($self) = @_;
+    my ($vmtx) = $self->{' PARENT'}{'vmtx'};
+    my ($glyphs);
+    my ($num);
+    my ($i, $maw, $mlsb, $mrsb, $mext, $aw, $lsb, $ext);
+
+    return undef unless ($self->SUPER::update);
+    return undef unless (defined $vmtx && defined $self->{' PARENT'}{'loca'});
+    $vmtx->read->update;
+    $self->{' PARENT'}{'loca'}->read->update;
+    $glyphs = $self->{' PARENT'}{'loca'}{'glyphs'};
+    $num = $self->{' PARENT'}{'maxp'}{'numGlyphs'};
+
+    for ($i = 0; $i < $num; $i++)
+    {
+        $aw = $vmtx->{'advance'}[$i];
+        $lsb = $vmtx->{'top'}[$i];
+        if (defined $glyphs->[$i])
+        { $ext = $lsb + $glyphs->[$i]->read->{'yMax'} - $glyphs->[$i]{'yMin'}; }
+        else
+        { $ext = $aw; }
+        $maw = $aw if ($aw > $maw);
+        $mlsb = $lsb if ($lsb < $mlsb or $i == 0);
+        $mrsb = $aw - $ext if ($aw - $ext < $mrsb or $i == 0);
+        $mext = $ext if ($ext > $mext);
+    }
+    $self->{'advanceHeightMax'} = $maw;
+    $self->{'minTopSideBearing'} = $mlsb;
+    $self->{'minBottomSideBearing'} = $mrsb;
+    $self->{'yMaxExtent'} = $mext;
+    $self->{'numberOfVMetrics'} = $vmtx->numMetrics;
+    $self;
+}
+
+
+1;
+
+
+=head1 BUGS
+
+None known
+
+=head1 AUTHOR
+
+Martin Hosken Martin_Hosken@sil.org. See L<Font::TTF::Font> for copyright and
+licensing.
+
+=cut
+