--- /dev/null
+package Font::TTF::EBLC;
+
+=head1 NAME
+
+Font::TTF::EBLC - Embeeded Bitmap Location Table
+
+=head1 DESCRIPTION
+
+Contains the sizes and glyph ranges of bitmaps, and the offsets to
+glyph bitmap data in indexSubTables for EBDT.
+
+Possibly contains glyph metrics information.
+
+=head1 INSTANCE VARIABLES
+The information specified 'B<(R)>ead only' is read only, those
+are calculated from EBDT, when it is 'update'-ed.
+
+=over 4
+
+=item bitmapSizeTable
+An array of tables of following information
+
+=over 8
+=item indexSubTableArrayOffset (R)
+=item indexTablesSize (R)
+=item numberOfIndexSubTables (R)
+=item colorRef
+=item hori
+=item vert
+=item startGlyphIndex (R)
+=item endGlyphIndex (R)
+=item ppemX
+=item ppemY
+=item bitDepth
+=item flags
+=back
+
+=item indexSubTableArray (R)
+An array which contains range information.
+
+=item indexSubTable (R)
+An array which contains offsets of EBDT table.
+
+=back
+
+=head1 METHODS
+
+=cut
+
+use strict;
+use vars qw(@ISA);
+require Font::TTF::Table;
+
+@ISA = qw(Font::TTF::Table);
+
+
+=head2 $t->read
+
+Reads the location information of embedded bitmap from the TTF file into memory
+
+=cut
+
+sub read
+{
+ my ($self) = @_;
+ my ($fh) = $self->{' INFILE'};
+ my ($i, $dat);
+ my ($indexSubTableArrayOffset,
+ $indexTablesSize,
+ $numberOfIndexSubTables,
+ $colorRef);
+ my ($startGlyphIndex,
+ $endGlyphIndex,
+ $ppemX, $ppemY,
+ $bitDepth, $flags);
+ my (@hori, @vert);
+ my ($bst, $ista, $ist);
+ my ($j);
+
+ $self->SUPER::read or return $self;
+
+ # eblcHeader
+ $fh->read($dat, 4);
+ $self->{'version'} = unpack("N",$dat);
+
+ $fh->read($dat, 4);
+ $self->{'Num'} = unpack("N",$dat);
+
+ # bitmapSizeTable
+ for ($i = 0; $i < $self->{'Num'}; $i++) {
+ $fh->read($dat, 16);
+ ($indexSubTableArrayOffset, $indexTablesSize,
+ $numberOfIndexSubTables, $colorRef) = unpack("NNNN", $dat);
+ $fh->read($dat, 12); @hori = unpack("cccccccccccc", $dat);
+ $fh->read($dat, 12); @vert = unpack("cccccccccccc", $dat);
+
+ $fh->read($dat, 8);
+ ($startGlyphIndex, $endGlyphIndex,
+ $ppemX, $ppemY, $bitDepth, $flags) = unpack("nnCCCC", $dat);
+
+ $self->{'bitmapSizeTable'}[$i] = {
+ 'indexSubTableArrayOffset' => $indexSubTableArrayOffset,
+ 'indexTablesSize' => $indexTablesSize,
+ 'numberOfIndexSubTables' => $numberOfIndexSubTables,
+ 'colorRef' => $colorRef,
+ 'hori' => [@hori],
+ 'vert' => [@vert],
+ 'startGlyphIndex' => $startGlyphIndex,
+ 'endGlyphIndex' => $endGlyphIndex,
+ 'ppemX' => $ppemX,
+ 'ppemY' => $ppemY,
+ 'bitDepth' => $bitDepth,
+ 'flags' => $flags
+ };
+ }
+
+ for ($i = 0; $i < $self->{'Num'}; $i++) {
+ my ($count, $x);
+
+ $bst = $self->{'bitmapSizeTable'}[$i];
+
+ for ($j = 0; $j < $bst->{'numberOfIndexSubTables'}; $j++) {
+ $ista = {};
+
+ # indexSubTableArray
+ $self->{'indexSubTableArray'}[$i][$j] = $ista;
+ $fh->read($dat, 8);
+ ($ista->{'firstGlyphIndex'},
+ $ista->{'lastGlyphIndex'},
+ $ista->{'additionalOffsetToIndexSubtable'})
+ = unpack("nnN", $dat);
+ }
+
+ # indexSubTable
+ # indexSubHeader
+ $fh->read($dat, 8);
+ ($bst->{'indexFormat'},
+ $bst->{'imageFormat'},
+ $bst->{'imageDataOffset'}) = unpack("nnN", $dat);
+
+ die "Only indexFormat == 1 is supported" unless ($bst->{'indexFormat'} == 1);
+
+ for ($j = 0; $j < $bst->{'numberOfIndexSubTables'}; $j++) {
+ $ista = $self->{'indexSubTableArray'}[$i][$j];
+ $count = $ista->{'lastGlyphIndex'} - $ista->{'firstGlyphIndex'} + 1 + 1;
+ $fh->seek($self->{' OFFSET'} + $bst->{'indexSubTableArrayOffset'}
+ + $ista->{'additionalOffsetToIndexSubtable'} + 8, 0);
+
+# $count += 2 if $j < $bst->{'numberOfIndexSubTables'} - 1;
+
+ $fh->read($dat, 4*$count);
+
+ $self->{'indexSubTable'}[$i][$j] = [unpack("N*", $dat)];
+ }
+ }
+
+ $self;
+}
+
+=head2 $t->out($fh)
+
+Outputs the location information of embedded bitmap for this font.
+
+=cut
+
+sub out
+{
+ my ($self, $fh) = @_;
+ my ($i);
+ my ($bst_array) = $self->{'bitmapSizeTable'};
+
+ $fh->print(pack("N", 0x00020000));
+ $fh->print(pack("N", $self->{'Num'}));
+
+ for ($i = 0; $i < $self->{'Num'}; $i++) {
+ my ($bst) = $bst_array->[$i];
+
+ $fh->print(pack("NNNN",
+ $bst->{'indexSubTableArrayOffset'},
+ $bst->{'indexTablesSize'},
+ $bst->{'numberOfIndexSubTables'},
+ $bst->{'colorRef'}));
+ $fh->print(pack("cccccccccccc", @{$bst->{'hori'}}));
+ $fh->print(pack("cccccccccccc", @{$bst->{'vert'}}));
+ $fh->print(pack("nnCCCC", $bst->{'startGlyphIndex'},
+ $bst->{'endGlyphIndex'}, $bst->{'ppemX'},
+ $bst->{'ppemY'}, $bst->{'bitDepth'}, $bst->{'flags'}));
+ }
+
+ for ($i = 0; $i < $self->{'Num'}; $i++) {
+ my ($bst) = $bst_array->[$i];
+ my ($j);
+
+ for ($j = 0; $j < $bst->{'numberOfIndexSubTables'}; $j++) {
+ my ($ista) = $self->{'indexSubTableArray'}[$i][$j];
+
+ $fh->print("nnN",
+ $ista->{'firstGlyphIndex'},
+ $ista->{'lastGlyphIndex'},
+ $ista->{'additionalOffsetToIndexSubtable'});
+ }
+
+ $fh->print(pack("nnN", $bst->{'indexFormat'}, $bst->{'imageFormat'},
+ $bst->{'imageDataOffset'}));
+
+ die "Only indexFormat == 1 is supported" unless ($bst->{'indexFormat'} == 1);
+
+ for ($j = 0; $j < $bst->{'numberOfIndexSubTables'}; $j++) {
+ $fh->print(pack("N*", $self->{'indexSubTable'}[$i][$j]));
+ }
+ }
+}
+
+1;
+
+=head1 BUGS
+
+Only indexFormat ==1 is implemented. XML output is not supported (yet).
+
+=head1 AUTHOR
+
+NIIBE Yutaka L<gniibe@fsij.org>. See L<Font::TTF::Font> for copyright and
+licensing.
+
+This was written at the CodeFest Akihabara 2006 hosted by FSIJ.
+
+=cut
+
fnp / librarian.git / blobdiff