X-Git-Url: https://git.mdrn.pl/librarian.git/blobdiff_plain/2ada86c7bb585d419b95c95ce42d5b7a9fa45475..fefdce4e24f9e397df5538fe6e7f54b5ece4d841:/src/librarian/font-optimizer/ext/Font-TTF/lib/Font/TTF/Hdmx.pm?ds=inline

diff --git a/src/librarian/font-optimizer/ext/Font-TTF/lib/Font/TTF/Hdmx.pm b/src/librarian/font-optimizer/ext/Font-TTF/lib/Font/TTF/Hdmx.pm
new file mode 100644
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--- /dev/null
+++ b/src/librarian/font-optimizer/ext/Font-TTF/lib/Font/TTF/Hdmx.pm
@@ -0,0 +1,149 @@
+package Font::TTF::Hdmx;
+
+=head1 NAME
+
+Font::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;
+use vars qw(@ISA);
+
+@ISA = qw(Font::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->print(pack("nnN", 0, $#ppem + 1, $len));
+    for $i (@ppem)
+    {
+        $max = 0;
+        foreach (@{$self->{$i}}[0..($numg - 1)])
+        { $max = $_ if $_ > $max; }
+        $fh->print(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');
+    $fh->print("$depth<metrics ppem='$key'>\n");
+    for ($i = 0; $i <= $#{$value}; $i += 25)
+    {
+        $fh->print("$depth$context->{'indent'}". join(' ', @{$value}[$i .. $i + 24]) . "\n");
+    }
+    $fh->print("$depth</metrics>\n");
+    $self;
+}
+
+1;
+
+=head1 BUGS
+
+None known
+
+=head1 AUTHOR
+
+Martin Hosken Martin_Hosken@sil.org. See L<Font::TTF::Font> for copyright and
+licensing.
+
+=cut
+