——————#=======================================================================
# ____ ____ _____ _ ____ ___ ____
# | _ \| _ \| ___| _ _ / \ | _ \_ _| |___ \
# | |_) | | | | |_ (_) (_) / _ \ | |_) | | __) |
# | __/| |_| | _| _ _ / ___ \| __/| | / __/
# |_| |____/|_| (_) (_) /_/ \_\_| |___| |_____|
#
# A Perl Module Chain to faciliate the Creation and Modification
# of High-Quality "Portable Document Format (PDF)" Files.
#
#=======================================================================
#
# THIS IS A REUSED PERL MODULE, FOR PROPER LICENCING TERMS SEE BELOW:
#
#
# Copyright Martin Hosken <Martin_Hosken@sil.org>
#
# No warranty or expression of effectiveness, least of all regarding
# anyone's safety, is implied in this software or documentation.
#
# This specific module is licensed under the Perl Artistic License.
#
#
# $Id: Hdmx.pm,v 2.0 2005/11/16 02:16:00 areibens Exp $
#
#=======================================================================
package
PDF::API2::Basic::TTF::Hdmx;
=head1 NAME
PDF::API2::Basic::TTF::Hdmx - Horizontal device metrics
=head1 DESCRIPTION
The table consists of an hash of device metric tables indexed by the ppem for
that subtable. Each subtable consists of an array of advance widths in pixels
for each glyph at that ppem (horizontally).
=head1 INSTANCE VARIABLES
Individual metrics are accessed using the following referencing:
$f->{'hdmx'}{$ppem}[$glyph_num]
In addition there is one instance variable:
=over 4
=item Num
Number of device tables.
=back
=head2 METHODS
=cut
use
strict;
@ISA
=
qw(PDF::API2::Basic::TTF::Table)
;
=head2 $t->read
Reads the table into data structures
=cut
sub
read
{
my
(
$self
) =
@_
;
my
(
$fh
) =
$self
->{
' INFILE'
};
my
(
$numg
,
$ppem
,
$i
,
$numt
,
$dat
,
$len
);
$numg
=
$self
->{
' PARENT'
}{
'maxp'
}{
'numGlyphs'
};
$self
->SUPER::
read
or
return
$self
;
$fh
->
read
(
$dat
, 8);
(
$self
->{
'Version'
},
$numt
,
$len
) =
unpack
(
"nnN"
,
$dat
);
$self
->{
'Num'
} =
$numt
;
for
(
$i
= 0;
$i
<
$numt
;
$i
++)
{
$fh
->
read
(
$dat
,
$len
);
$ppem
=
unpack
(
"C"
,
$dat
);
$self
->{
$ppem
} = [
unpack
(
"C$numg"
,
substr
(
$dat
, 2))];
}
$self
;
}
=head2 $t->out($fh)
Outputs the device metrics for this font
=cut
sub
out
{
my
(
$self
,
$fh
) =
@_
;
my
(
$numg
,
$i
,
$pad
,
$len
,
$numt
,
@ppem
,
$max
);
return
$self
->SUPER::out(
$fh
)
unless
(
$self
->{
' read'
});
$numg
=
$self
->{
' PARENT'
}{
'maxp'
}{
'numGlyphs'
};
@ppem
=
grep
(/^\d+$/,
sort
{
$a
<=>
$b
}
keys
%$self
);
$pad
=
"\000"
x (3 - (
$numg
+ 1) % 4);
$len
=
$numg
+ 2 +
length
(
$pad
);
$fh
->
(
pack
(
"nnN"
, 0,
$#ppem
+ 1,
$len
));
for
$i
(
@ppem
)
{
$max
= 0;
foreach
(@{
$self
->{
$i
}}[0..(
$numg
- 1)])
{
$max
=
$_
if
$_
>
$max
; }
$fh
->
(
pack
(
"C*"
,
$i
,
$max
, @{
$self
->{
$i
}}[0..(
$numg
- 1)]) .
$pad
);
}
$self
;
}
=head2 $t->tables_do(&func)
For each subtable it calls &sub($ref, $ppem)
=cut
sub
tables_do
{
my
(
$self
,
$func
) =
@_
;
my
(
$i
);
foreach
$i
(
grep
(/^\d+$/,
%$self
))
{
&$func
(
$self
->{
$i
},
$i
); }
$self
;
}
=head2 $t->XML_element($context, $depth, $key, $value)
Outputs device metrics a little more tidily
=cut
sub
XML_element
{
my
(
$self
) =
shift
;
my
(
$context
,
$depth
,
$key
,
$value
) =
@_
;
my
(
$fh
) =
$context
->{
'fh'
};
my
(
$i
);
return
$self
->SUPER::XML_element(
@_
)
if
(
ref
(
$value
) ne
'ARRAY'
);
$fh
->
(
"$depth<metrics ppem='$key'>\n"
);
for
(
$i
= 0;
$i
<= $
#{$value}; $i += 25)
{
$fh
->
(
"$depth$context->{'indent'}"
.
join
(
' '
, @{
$value
}[
$i
..
$i
+ 24]) .
"\n"
);
}
$fh
->
(
"$depth</metrics>\n"
);
$self
;
}
1;
=head1 BUGS
None known
=head1 AUTHOR
Martin Hosken Martin_Hosken@sil.org. See L<PDF::API2::Basic::TTF::Font> for copyright and
licensing.
=cut