File: BdFont.pm

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libpdf-api2-perl 2.038-3
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package PDF::API2::Resource::Font::BdFont;

use base 'PDF::API2::Resource::Font';

use strict;
no warnings qw[ deprecated recursion uninitialized ];

our $VERSION = '2.038'; # VERSION

use PDF::API2::Util;
use PDF::API2::Basic::PDF::Utils;

our $BmpNum = 0;

=head1 NAME

PDF::API2::Resource::Font::BdFont - Module for using bitmapped Fonts.

=head1 SYNOPSIS

    #
    use PDF::API2;
    #
    $pdf = PDF::API2->new;
    $sft = $pdf->bdfont($file);
    #

=head1 METHODS

=over 4

=cut

=item $font = PDF::API2::Resource::Font::BdFont->new $pdf, $font, %options

Returns a BmpFont object.

=cut

=pod

Valid %options are:

I<-encode>
... changes the encoding of the font from its default.
See I<perl's Encode> for the supported values.

I<-pdfname> ... changes the reference-name of the font from its default.
The reference-name is normally generated automatically and can be
retrieved via $pdfname=$font->name.

=cut

sub new {
    my ($class,$pdf,$file,@opts) = @_;
    my ($self,$data);
    my %opts=@opts;

    $class = ref $class if ref $class;
    $self = $class->SUPER::new($pdf, sprintf('%s+Bdf%02i',pdfkey(),++$BmpNum));
    $pdf->new_obj($self) unless($self->is_obj($pdf));

    # adobe bitmap distribution font
    $self->{' data'}=$self->readBDF($file);

    my $first=1;
    my $last=255;

    $self->{'Subtype'} = PDFName('Type3');
    $self->{'FirstChar'} = PDFNum($first);
    $self->{'LastChar'} = PDFNum($last);
    $self->{'FontMatrix'} = PDFArray(map { PDFNum($_) } ( 0.001, 0, 0, 0.001, 0, 0 ) );
    $self->{'FontBBox'} = PDFArray(map { PDFNum($_) } ( $self->fontbbox ) );

    my $xo=PDFDict();
    $self->{'Encoding'}=$xo;
    $xo->{Type}=PDFName('Encoding');
    $xo->{BaseEncoding}=PDFName('WinAnsiEncoding');
    $xo->{Differences}=PDFArray(PDFNum('0'),(map { PDFName($_||'.notdef') } @{$self->data->{char}}));

    my $procs=PDFDict();
    $pdf->new_obj($procs);
    $self->{'CharProcs'} = $procs;

    $self->{Resources}=PDFDict();
    $self->{Resources}->{ProcSet}=PDFArray(map { PDFName($_) } qw(PDF Text ImageB ImageC ImageI));
    foreach my $w ($first..$last) {
        $self->data->{uni}->[$w]=uniByName($self->data->{char}->[$w]);
        $self->data->{u2e}->{$self->data->{uni}->[$w]}=$w;
    }
    my @widths=();
    foreach my $w (@{$self->data->{char2}}) {
        $widths[$w->{ENCODING}]=$self->data->{wx}->{$w->{NAME}};
        my @bbx=@{$w->{BBX}};
        my $stream=pack('H*',$w->{hex});
        my $y=$bbx[1];
        my $char=PDFDict();
        $char->{Filter}=PDFArray(PDFName('FlateDecode'));
        ## $char->{' stream'}=$widths[$w->{ENCODING}]." 0 ".join(' ',map { int($_) } $self->fontbbox)." d1\n";
        $char->{' stream'}=$widths[$w->{ENCODING}]." 0 d0\n";
        $char->{Comment}=PDFStr("N='$w->{NAME}' C=($w->{ENCODING})");
        $procs->{$w->{NAME}}=$char;
        @bbx=map { $_*1000/$self->data->{upm} } @bbx;
        if($y==0) {
            $char->{' stream'}.="q Q\n";
        } else {
            my $x=8*length($stream)/$y; # q $x 0 0 $y 50 50 cm
            my $img=qq|BI\n/Interpolate true/Mask[0 0.1]/Decode[1 0]/H $y/W $x/BPC 1/CS/G\nID $stream\nEI\n|;
            $procs->{$self->data->{char}->[$w]}=$char;
            $char->{' stream'}.="$bbx[0] 0 0 $bbx[1] $bbx[2] $bbx[3] cm\n$img\n";
        }
        $pdf->new_obj($char);
    }
    $procs->{'.notdef'}=$procs->{$self->data->{char}->[32]};
    delete $procs->{''};
    $self->{Widths}=PDFArray(map { PDFNum($widths[$_]||0) } ($first..$last));
    $self->data->{e2n}=$self->data->{char};
    $self->data->{e2u}=$self->data->{uni};

    $self->data->{u2c}={};
    $self->data->{u2e}={};
    $self->data->{u2n}={};
    $self->data->{n2c}={};
    $self->data->{n2e}={};
    $self->data->{n2u}={};

    foreach my $n (reverse 0..255) {
        $self->data->{n2c}->{$self->data->{char}->[$n] || '.notdef'}=$n unless(defined $self->data->{n2c}->{$self->data->{char}->[$n] || '.notdef'});
        $self->data->{n2e}->{$self->data->{e2n}->[$n] || '.notdef'}=$n unless(defined $self->data->{n2e}->{$self->data->{e2n}->[$n] || '.notdef'});

        $self->data->{n2u}->{$self->data->{e2n}->[$n] || '.notdef'}=$self->data->{e2u}->[$n] unless(defined $self->data->{n2u}->{$self->data->{e2n}->[$n] || '.notdef'});
        $self->data->{n2u}->{$self->data->{char}->[$n] || '.notdef'}=$self->data->{uni}->[$n] unless(defined $self->data->{n2u}->{$self->data->{char}->[$n] || '.notdef'});

        $self->data->{u2c}->{$self->data->{uni}->[$n]}=$n unless(defined $self->data->{u2c}->{$self->data->{uni}->[$n]});
        $self->data->{u2e}->{$self->data->{e2u}->[$n]}=$n unless(defined $self->data->{u2e}->{$self->data->{e2u}->[$n]});

        $self->data->{u2n}->{$self->data->{e2u}->[$n]}=($self->data->{e2n}->[$n] || '.notdef') unless(defined $self->data->{u2n}->{$self->data->{e2u}->[$n]});
        $self->data->{u2n}->{$self->data->{uni}->[$n]}=($self->data->{char}->[$n] || '.notdef') unless(defined $self->data->{u2n}->{$self->data->{uni}->[$n]});
    }

    return($self);
}

sub readBDF {
    my ($self,$file)=@_;
    my $data={};
    $data->{char}=[];
    $data->{char2}=[];
    $data->{wx}={};

    if(! -e $file) {die "file='$file' not existant.";}
    open(my $afmf, "<", $file) or die "Can't find the BDF file for $file";
    local($/, $_) = ("\n", undef);  # ensure correct $INPUT_RECORD_SEPARATOR
    while ($_=<$afmf>) {
        chomp($_);
        if (/^STARTCHAR/ .. /^ENDCHAR/) {
            if (/^STARTCHAR\s+(\S+)/) {
                my $name=$1;
                $name=~s|^(\d+.*)$|X_$1|;
                push @{$data->{char2}},{'NAME'=>$name};
            } elsif (/^BITMAP/ .. /^ENDCHAR/) {
                next if(/^BITMAP/);
                if(/^ENDCHAR/){
                    $data->{char2}->[-1]->{NAME}||='E_'.$data->{char2}->[-1]->{ENCODING};
                    $data->{char}->[$data->{char2}->[-1]->{ENCODING}]=$data->{char2}->[-1]->{NAME};
                    ($data->{wx}->{$data->{char2}->[-1]->{NAME}})=split(/\s+/,$data->{char2}->[-1]->{SWIDTH});
                    $data->{char2}->[-1]->{BBX}=[split(/\s+/,$data->{char2}->[-1]->{BBX})];
                } else {
                    $data->{char2}->[-1]->{hex}.=$_;
                }
            } else {
                m|^(\S+)\s+(.+)$|;
                $data->{char2}->[-1]->{uc($1)}.=$2;
            }
        ## } elsif(/^STARTPROPERTIES/ .. /^ENDPROPERTIES/) {
        } else {
                m|^(\S+)\s+(.+)$|;
                $data->{uc($1)}.=$2;
        }
    }
    close($afmf);
    unless (exists $data->{wx}->{'.notdef'}) {
        $data->{wx}->{'.notdef'} = 0;
        $data->{bbox}{'.notdef'} = [0, 0, 0, 0];
    }

    $data->{fontname}=pdfkey();
    $data->{apiname}=$data->{fontname};
    $data->{flags} = 34;
    $data->{fontbbox} = [ split(/\s+/,$data->{FONTBOUNDINGBOX}) ];
    $data->{upm}=$data->{PIXEL_SIZE} || ($data->{fontbbox}->[1] - $data->{fontbbox}->[3]);
    @{$data->{fontbbox}} = map { int($_*1000/$data->{upm}) } @{$data->{fontbbox}};

    foreach my $n (0..255) {
        $data->{char}->[$n]||='.notdef';
    #    $data->{wx}->{$data->{char}->[$n]}=int($data->{wx}->{$data->{char}->[$n]}*1000/$data->{upm});
    }

    $data->{uni}||=[];
    foreach my $n (0..255) {
        $data->{uni}->[$n]=uniByName($data->{char}->[$n] || '.notdef') || 0;
    }
    $data->{ascender}=$data->{RAW_ASCENT}
        || int($data->{FONT_ASCENT}*1000/$data->{upm});
    $data->{descender}=$data->{RAW_DESCENT}
        || int($data->{FONT_DESCENT}*1000/$data->{upm});

    $data->{type}='Type3';
    $data->{capheight}=1000;
    $data->{iscore}=0;
    $data->{issymbol} = 0;
    $data->{isfixedpitch}=0;
    $data->{italicangle}=0;
    $data->{missingwidth}=$data->{AVERAGE_WIDTH}
        || int($data->{FONT_AVERAGE_WIDTH}*1000/$data->{upm})
        || $data->{RAW_AVERAGE_WIDTH}
        || 500;
    $data->{underlineposition}=-200;
    $data->{underlinethickness}=10;
    $data->{xheight}=$data->{RAW_XHEIGHT}
        || int($data->{FONT_XHEIGHT}*1000/$data->{upm})
        || int($data->{ascender}/2);
    $data->{firstchar}=1;
    $data->{lastchar}=255;

    delete $data->{wx}->{''};

    return($data);
}

1;

__END__

=back

=head1 AUTHOR

alfred reibenschuh

=cut