X-Git-Url: https://git.mdrn.pl/librarian.git/blobdiff_plain/ef7911fba9c330552599bc6eb9dc22606246dd7e..68b03397a0872d10d3627cea2b92ae36bd59183c:/font-optimizer/ext/Font-TTF/lib/Font/TTF/Head.pm diff --git a/font-optimizer/ext/Font-TTF/lib/Font/TTF/Head.pm b/font-optimizer/ext/Font-TTF/lib/Font/TTF/Head.pm new file mode 100644 index 0000000..362e8e4 --- /dev/null +++ b/font-optimizer/ext/Font-TTF/lib/Font/TTF/Head.pm @@ -0,0 +1,250 @@ +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. + +=head1 INSTANCE VARIABLES + +The C 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\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 for copyright and +licensing. + +=cut +