/usr/share/perl5/Font/TTF/Delta.pm is in libfont-ttf-perl 1.05-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | package Font::TTF::Delta;
=head1 NAME
Font::TTF::Delta - Opentype Device tables
=head1 DESCRIPTION
Each device table corresponds to a set of deltas for a particular point over
a range of ppem values.
=over
=item first
The first ppem value in the range
=item last
The last ppem value in the range
=item val
This is an array of deltas corresponding to each ppem in the range between
first and last inclusive.
=item fmt
This is the fmt used (log2 of number bits per value) when the device table was
read. It is recalculated on output.
=back
=head1 METHODS
=cut
use strict;
use Font::TTF::Utils;
=head2 new
Creates a new device table
=cut
sub new
{
my ($class) = @_;
my ($self) = {};
bless $self, $class;
}
=head2 read
Reads a device table from the given IO object at the current location
=cut
sub read
{
my ($self, $fh) = @_;
my ($dat, $fmt, $num, $i, $j, $mask);
$fh->read($dat, 6);
($self->{'first'}, $self->{'last'}, $fmt) = TTF_Unpack("S3", $dat);
$self->{'fmt'} = $fmt;
$fmt = 1 << $fmt;
$num = ((($self->{'last'} - $self->{'first'} + 1) * $fmt) + 15) >> 8;
$fh->read($dat, $num);
$mask = (0xffff << (16 - $fmt)) & 0xffff;
$j = 0;
for ($i = $self->{'first'}; $i <= $self->{'last'}; $i++)
{
if ($j == 0)
{
$num = TTF_Unpack("S", substr($dat, 0, 2));
substr($dat, 0, 2) = '';
}
push (@{$self->{'val'}}, ($num & $mask) >> (16 - $fmt));
$num <<= $fmt;
$j += $fmt;
$j = 0 if ($j >= 16);
}
$self;
}
=head2 out($fh, $style)
Outputs a device table to the given IO object at the current location, or just
returns the data to be output if $style != 0
=cut
sub out
{
my ($self, $fh, $style) = @_;
my ($dat, $fmt, $num, $mask, $j, $f, $out);
foreach $f (@{$self->{'val'}})
{
my ($tfmt) = $f > 0 ? $f + 1 : -$f;
$fmt = $tfmt if $tfmt > $fmt;
}
if ($fmt > 8)
{ $fmt = 3; }
elsif ($fmt > 2)
{ $fmt = 2; }
else
{ $fmt = 1; }
$out = TTF_Pack("S3", $self->{'first'}, $self->{'last'}, $fmt);
$fmt = 1 << $fmt;
$mask = 0xffff >> (16 - $fmt);
$j = 0; $dat = 0;
foreach $f (@{$self->{'val'}})
{
$dat |= ($f & $mask) << (16 - $fmt - $j);
$j += $fmt;
if ($j >= 16)
{
$j = 0;
$out .= TTF_Pack("S", $dat);
$dat = 0;
}
}
$out .= pack('n', $dat) if ($j > 0);
$fh->print($out) unless $style;
$out;
}
=head2 $d->signature()
Returns a content based identifying string for this delta for
compression purposes
=cut
sub signature
{
my ($self) = @_;
return join (",", $self->{'first'}, $self->{'last'}, @{$self->{'val'}});
}
=head2 $d->out_xml($context)
Outputs a delta in XML
=cut
sub out_xml
{
my ($self, $context, $depth) = @_;
my ($fh) = $context->{'fh'};
$fh->printf("%s<delta first='%s' last='%s'>\n", $depth, $self->{'first'}, $self->{'last'});
$fh->print("$depth$context->{'indent'}" . join (' ', @{$self->{'val'}}) . "\n") if defined ($self->{'val'});
$fh->print("$depth</delta>\n");
}
1;
=head1 AUTHOR
Martin Hosken L<http://scripts.sil.org/FontUtils>.
=head1 LICENSING
Copyright (c) 1998-2014, SIL International (http://www.sil.org)
This module is released under the terms of the Artistic License 2.0.
For details, see the full text of the license in the file LICENSE.
=cut
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