--- /dev/null
+package Font::TTF::Head;
+
+=head1 NAME
+
+Font::TTF::Head - The head table for a TTF Font
+
+=head1 DESCRIPTION
+
+This is a very basic table with just instance variables as described in the
+TTF documentation, using the same names. One of the most commonly used is
+C<unitsPerEm>.
+
+=head1 INSTANCE VARIABLES
+
+The C<head> table has no internal instance variables beyond those common to all
+tables and those specified in the standard:
+
+ version
+ fontRevision
+ checkSumAdjustment
+ magicNumber
+ flags
+ unitsPerEm
+ created
+ modified
+ xMin
+ yMin
+ xMax
+ yMax
+ macStyle
+ lowestRecPPEM
+ fontDirectionHint
+ indexToLocFormat
+ glyphDataFormat
+
+The two dates are held as an array of two unsigned longs (32-bits)
+
+=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',
+ 'fontRevision' => 'f',
+ 'checkSumAdjustment' => 'L',
+ 'magicNumber' => 'L',
+ 'flags' => 'S',
+ 'unitsPerEm' => 'S',
+ 'created' => 'L2',
+ 'modified' => 'L2',
+ 'xMin' => 's',
+ 'yMin' => 's',
+ 'xMax' => 's',
+ 'yMax' => 's',
+ 'macStyle' => 'S',
+ 'lowestRecPPEM' => 'S',
+ 'fontDirectionHint' => 's',
+ 'indexToLocFormat' => 's',
+ 'glyphDataFormat' => '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 $t->read
+
+Reads the table into memory thanks to some utility functions
+
+=cut
+
+sub read
+{
+ my ($self) = @_;
+ my ($dat);
+
+ $self->SUPER::read || return $self;
+
+ init unless defined $fields{'Ascender'};
+ $self->{' INFILE'}->read($dat, 54);
+
+ TTF_Read_Fields($self, $dat, \%fields);
+ $self;
+}
+
+
+=head2 $t->out($fh)
+
+Writes the table to a file either from memory or by copying. If in memory
+(which is usually) the checkSumAdjustment field is set to 0 as per the default
+if the file checksum is not to be considered.
+
+=cut
+
+sub out
+{
+ my ($self, $fh) = @_;
+
+ return $self->SUPER::out($fh) unless $self->{' read'}; # this is never true
+# $self->{'checkSumAdjustment'} = 0 unless $self->{' PARENT'}{' wantsig'};
+ $fh->print(TTF_Out_Fields($self, \%fields, 54));
+ $self;
+}
+
+
+=head2 $t->XML_element($context, $depth, $key, $value)
+
+Handles date process for the XML exporter
+
+=cut
+
+sub XML_element
+{
+ my ($self) = shift;
+ my ($context, $depth, $key, $value) = @_;
+ my ($fh) = $context->{'fh'};
+ my ($output, @time);
+ my (@month) = qw(JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC);
+
+ return $self->SUPER::XML_element(@_) unless ($key eq 'created' || $key eq 'modified');
+
+ @time = gmtime($self->getdate($key eq 'created'));
+ $output = sprintf("%d/%s/%d %d:%d:%d", $time[3], $month[$time[4]], $time[5] + 1900,
+ $time[2], $time[1], $time[0]);
+ $fh->print("$depth<$key>$output</$key>\n");
+ $self;
+}
+
+
+=head2 $t->update
+
+Updates the head table based on the glyph data and the hmtx table
+
+=cut
+
+sub update
+{
+ my ($self) = @_;
+ my ($num, $i, $loc, $hmtx);
+ my ($xMin, $yMin, $xMax, $yMax, $lsbx);
+
+ return undef unless ($self->SUPER::update);
+
+ $num = $self->{' PARENT'}{'maxp'}{'numGlyphs'};
+ return undef unless (defined $self->{' PARENT'}{'hmtx'} && defined $self->{' PARENT'}{'loca'});
+ $hmtx = $self->{' PARENT'}{'hmtx'}->read;
+
+ $self->{' PARENT'}{'loca'}->update;
+ $hmtx->update; # if we updated, then the flags will be set anyway.
+ $lsbx = 1;
+ for ($i = 0; $i < $num; $i++)
+ {
+ $loc = $self->{' PARENT'}{'loca'}{'glyphs'}[$i];
+ next unless defined $loc;
+ $loc->read->update_bbox;
+ $xMin = $loc->{'xMin'} if ($loc->{'xMin'} < $xMin || $i == 0);
+ $yMin = $loc->{'yMin'} if ($loc->{'yMin'} < $yMin || $i == 0);
+ $xMax = $loc->{'xMax'} if ($loc->{'xMax'} > $xMax);
+ $yMax = $loc->{'yMax'} if ($loc->{'yMax'} > $yMax);
+ $lsbx &= ($loc->{'xMin'} == $hmtx->{'lsb'}[$i]);
+ }
+ $self->{'xMin'} = $xMin;
+ $self->{'yMin'} = $yMin;
+ $self->{'xMax'} = $xMax;
+ $self->{'yMax'} = $yMax;
+ if ($lsbx)
+ { $self->{'flags'} |= 2; }
+ else
+ { $self->{'flags'} &= ~2; }
+ $self;
+}
+
+
+=head2 $t->getdate($is_create)
+
+Converts font modification time (or creation time if $is_create is set) to a 32-bit integer as returned
+from time(). Returns undef if the value is out of range, either before the epoch or after the maximum
+storable time.
+
+=cut
+
+sub getdate
+{
+ my ($self, $is_create) = @_;
+ my ($arr) = $self->{$is_create ? 'created' : 'modified'};
+
+ $arr->[1] -= 2082844800; # seconds between 1/Jan/1904 and 1/Jan/1970 (midnight)
+ if ($arr->[1] < 0)
+ {
+ $arr->[1] += 0xFFFFFFF; $arr->[1]++;
+ $arr->[0]--;
+ }
+ return undef if $arr->[0] != 0;
+ return $arr->[1];
+}
+
+
+=head2 $t->setdate($time, $is_create)
+
+Sets the time information for modification (or creation time if $is_create is set) according to the 32-bit
+time information.
+
+=cut
+
+sub setdate
+{
+ my ($self, $time, $is_create) = @_;
+ my (@arr);
+
+ $arr[1] = $time;
+ if ($arr[1] >= 0x83DA4F80)
+ {
+ $arr[1] -= 0xFFFFFFFF;
+ $arr[1]--;
+ $arr[0]++;
+ }
+ $arr[1] += 2082844800;
+ $self->{$is_create ? 'created' : 'modified'} = \@arr;
+ $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