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package Font::TTF::Anchor;
=head1 NAME
Font::TTF::Anchor - Anchor points for GPOS tables
=head1 DESCRIPTION
The Anchor defines an anchor point on a glyph providing various information
depending on how much is available, including such information as the co-ordinates,
a curve point and even device specific modifiers.
=head1 INSTANCE VARIABLES
=over 4
=item x
XCoordinate of the anchor point
=item y
YCoordinate of the anchor point
=item p
Curve point on the glyph to use as the anchor point
=item xdev
Device table (delta) for the xcoordinate
=item ydev
Device table (delta) for the ycoordinate
=item xid
XIdAnchor for multiple master horizontal metric id
=item yid
YIdAnchor for multiple master vertical metric id
=back
=head1 METHODS
=cut
use strict;
use Font::TTF::Utils;
=head2 new
Creates a new Anchor
=cut
sub new
{
my ($class) = shift;
my ($self) = {@_};
bless $self, $class;
}
=head2 read($fh)
Reads the anchor from the given file handle at that point. The file handle is left
at an arbitrary read point, usually the end of something!
=cut
sub read
{
my ($self, $fh) = @_;
my ($dat, $loc, $fmt, $p, $xoff, $yoff);
$fh->read($dat, 6);
$fmt = unpack('n', $dat);
if ($fmt == 4)
{ ($self->{'xid'}, $self->{'yid'}) = TTF_Unpack('S2', substr($dat,2)); }
else
{ ($self->{'x'}, $self->{'y'}) = TTF_Unpack('s2', substr($dat,2)); }
if ($fmt == 2)
{
$fh->read($dat, 2);
$self->{'p'} = unpack('n', $dat);
} elsif ($fmt == 3)
{
$fh->read($dat, 4);
($xoff, $yoff) = unpack('n2', $dat);
$loc = $fh->tell() - 10;
if ($xoff)
{
$fh->seek($loc + $xoff, 0);
$self->{'xdev'} = Font::TTF::Delta->new->read($fh);
}
if ($yoff)
{
$fh->seek($loc + $yoff, 0);
$self->{'ydev'} = Font::TTF::Delta->new->read($fh);
}
}
$self;
}
=head2 out($fh, $style)
Outputs the Anchor to the given file handle at this point also addressing issues
of deltas. If $style is set, then no output is sent to the file handle. The return
value is the output string.
=cut
sub out
{
my ($self, $fh, $style) = @_;
my ($xoff, $yoff, $fmt, $out);
if (defined $self->{'xid'} || defined $self->{'yid'})
{ $out = TTF_Pack('SSS', 4, $self->{'xid'}, $self->{'yid'}); }
elsif (defined $self->{'p'})
{ $out = TTF_Pack('Ssss', 2, @{$self}{'x', 'y', 'p'}); }
elsif (defined $self->{'xdev'} || defined $self->{'ydev'})
{
$out = TTF_Pack('Sss', 3, @{$self}{'x', 'y'});
if (defined $self->{'xdev'})
{
$out .= pack('n2', 10, 0);
$out .= $self->{'xdev'}->out($fh, 1);
$yoff = length($out) - 10;
}
else
{ $out .= pack('n2', 0, 0); }
if (defined $self->{'ydev'})
{
$yoff = 10 unless $yoff;
substr($out, 8, 2) = pack('n', $yoff);
$out .= $self->{'ydev'}->out($fh, 1);
}
} else
{ $out = TTF_Pack('Sss', 1, @{$self}{'x', 'y'}); }
$fh->print($out) unless $style;
$out;
}
sub signature
{
my ($self) = @_;
return join (",", map {"${_}=$self->{$_}"} qw(x y p xdev ydev xid yid));
}
=head2 $a->out_xml($context)
Outputs the anchor in XML
=cut
sub out_xml
{
my ($self, $context, $depth) = @_;
my ($fh) = $context->{'fh'};
my ($end);
$fh->print("$depth<anchor x='$self->{'x'}' y='$self->{'y'}'");
$fh->print(" p='$self->{'p'}'") if defined ($self->{'p'});
$end = (defined $self->{'xdev'} || defined $self->{'ydev'} || defined $self->{'xid'} || defined $self->{'yid'});
unless ($end)
{
$fh->print("/>\n");
return $self;
}
if (defined $self->{'xdev'})
{
$fh->print("$depth$context->{'indent'}<xdev>\n");
$self->{'xdev'}->out_xml($context, $depth . ($context->{'indent'} x 2));
$fh->print("$depth$context->{'indent'}</xdev>\n");
}
if (defined $self->{'ydev'})
{
$fh->print("$depth$context->{'indent'}<ydev>\n");
$self->{'ydev'}->out_xml($context, $depth . ($context->{'indent'} x 2));
$fh->print("$depth$context->{'indent'}</ydev>\n");
}
if (defined $self->{'xid'} || defined $self->{'yid'})
{
$fh->print("$depth$context->{'indent'}<mmaster");
$fh->print(" xid='$self->{'xid'}'") if defined ($self->{'xid'});
$fh->print(" yid='$self->{'yid'}'") if defined ($self->{'yid'});
$fh->print("/>\n");
}
$fh->print("$depth</anchor>\n");
$self;
}
1;
=head1 AUTHOR
Martin Hosken L<Martin_Hosken@sil.org>.
=head1 LICENSING
Copyright (c) 1998-2013, 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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