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package PDF::Builder::Resource::UniFont;
use strict;
use warnings;
our $VERSION = '3.026'; # VERSION
our $LAST_UPDATE = '3.026'; # manually update whenever code is changed
use Carp;
use Encode qw(:all);
=head1 NAME
PDF::Builder::Resource::UniFont - Unicode Font Support
=head1 METHODS
=head2 new
$font = PDF::Builder::Resource::UniFont->new($pdf, @fontspecs, %options)
=over
Returns a uni-font object.
B<FONTSPECS:> fonts can be registered using the following hash-ref:
{
font => $fontobj, # the font to be registered
blocks => $blockspec, # the unicode blocks the font is being registered for
codes => $codespec, # the unicode codepoints, -"-
}
B<BLOCKSPECS:>
[
$block1, $block3, # register font for block 1 + 3
[$blockA, $blockZ], # register font for blocks A .. Z
]
B<CODESPECS:>
[
$cp1, $cp3, # register font for codepoint 1 + 3
[$cpA, $cpZ], # register font for codepoints A .. Z
]
B<NOTE:> if you want to register a font for the entire unicode space
(ie. U+0000 .. U+FFFF), then simply specify a font-object without the hash-ref.
Valid %options are:
'encode' ... changes the encoding of the font from its default.
(see "perldoc Encode" for a list of valid tags)
=back
=cut
sub new {
my $class = shift();
$class = ref($class) if ref($class);
my $self = {
'fonts' => [],
'block' => {},
'code' => {},
'pdf' => shift(),
};
bless $self, $class;
my @fonts;
push @fonts, shift() while ref($_[0]);
my %options = @_;
# copy dashed option names to preferred undashed names
if (defined $options{'-encode'} && !defined $options{'encode'}) { $options{'encode'} = delete($options{'-encode'}); }
$self->{'encode'} = $options{'encode'} if defined $options{'encode'};
# note that self->encode is undefined if encode not given!
my $font_number = 0;
foreach my $font (@fonts) {
if (ref($font) eq 'ARRAY') {
push @{$self->{'fonts'}}, shift(@$font);
while (defined $font->[0]) {
my $blockspec = shift @$font;
if (ref($blockspec)) {
foreach my $block ($blockspec->[0] .. $blockspec->[-1]) {
$self->{'block'}->{$block} = $font_number;
}
} else {
$self->{'block'}->{$blockspec} = $font_number;
}
}
} elsif (ref($font) eq 'HASH') {
push @{$self->{'fonts'}}, $font->{'font'};
if (defined $font->{'blocks'} and
ref($font->{'blocks'}) eq 'ARRAY') {
foreach my $blockspec (@{$font->{'blocks'}}) {
if (ref($blockspec)) {
foreach my $block ($blockspec->[0] .. $blockspec->[-1]) {
$self->{'block'}->{$block} = $font_number;
}
} else {
$self->{'block'}->{$blockspec} = $font_number;
}
}
}
if (defined $font->{'codes'} and
ref($font->{'codes'}) eq 'ARRAY') {
foreach my $codespec (@{$font->{'codes'}}) {
if (ref($codespec)) {
foreach my $code ($codespec->[0] .. $codespec->[-1]) {
$self->{'code'}->{$code} = $font_number;
}
} else {
$self->{'code'}->{$codespec} = $font_number;
}
}
}
} else {
push @{$self->{'fonts'}}, $font;
foreach my $block (0 .. 255) {
$self->{'block'}->{$block} = $font_number;
}
}
$font_number++;
}
return $self;
}
=head2 isvirtual
$flag = $font->isvirtual()
=over
(No Information)
=back
=cut
sub isvirtual {
return 1;
}
=head2 fontlist
$font->fontlist()
=over
(No Information)
=back
=cut
sub fontlist {
my $self = shift;
return [@{ $self->{'fonts'} }];
}
=head2 width
$w = $font->width($string)
=over
(No Information)
=back
=cut
sub width {
my ($self, $text) = @_;
if (defined $self->{'encode'}) { # is self->encode guaranteed set?
$text = decode($self->{'encode'}, $text) unless utf8::is_utf8($text);
}
my $width = 0;
my @blocks = ();
foreach my $u (unpack('U*', $text)) {
my $font_number = 0;
if (defined $self->{'code'}->{$u}) {
$font_number = $self->{'code'}->{$u};
} elsif (defined $self->{'block'}->{($u >> 8)}) {
$font_number = $self->{'block'}->{($u >> 8)};
} else {
$font_number = 0;
}
if (scalar @blocks == 0 or $blocks[-1]->[0] != $font_number) {
push @blocks, [$font_number, pack('U', $u)];
} else {
$blocks[-1]->[1] .= pack('U', $u);
}
}
foreach my $block (@blocks) {
my ($font_number, $string) = @$block;
$width += $self->fontlist()->[$font_number]->width($string);
}
return $width;
}
=head2 text
$font->text($string, $size, $indent)
=over
(No Information)
=back
=cut
sub text {
my ($self, $text, $size, $indent) = @_;
if (defined $self->{'encode'}) { # is self->encode guaranteed to be defined?
$text = decode($self->{'encode'}, $text) unless utf8::is_utf8($text);
}
croak 'Font size not specified' unless defined $size;
my $newtext = '';
my $last_font_number;
my @codes;
foreach my $u (unpack('U*', $text)) {
my $font_number = 0;
if (defined $self->{'code'}->{$u}) {
$font_number = $self->{'code'}->{$u};
} elsif (defined $self->{'block'}->{($u >> 8)}) {
$font_number = $self->{'block'}->{($u >> 8)};
}
if (defined $last_font_number and
$font_number != $last_font_number) {
my $font = $self->fontlist()->[$last_font_number];
$newtext .= '/' . $font->name() . ' ' . $size. ' Tf ';
$newtext .= $font->text(pack('U*', @codes), $size, $indent) . ' ';
$indent = undef;
@codes = ();
}
push @codes, $u;
$last_font_number = $font_number;
}
if (scalar @codes > 0) {
my $font = $self->fontlist()->[$last_font_number];
$newtext .= '/' . $font->name() . ' ' . $size . ' Tf ';
$newtext .= $font->text(pack('U*', @codes), $size, $indent);
}
return $newtext;
}
1;
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