nasm/doc/findfont.ph

#!/usr/bin/perl
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#
# Try our best to find a specific PostScipt font in the system.
# We need to find the font files so we can extract the metrics.
# Sadly there isn't any reasonable Perl module to do this for us,
# as far as I can tell.
#

use strict;
use File::Spec;
use File::Find;

require 'afmmetrics.ph';
require 'ttfmetrics.ph';

my %font_info_hash = ();
my $fonts_scanned = 0;
my %prefs = { 'otf' => 1, 'ttf' => 2, 'pfa' => 3, 'pfb' => 4 };

sub add_file_to_font_hash($) {
    my($filename) = @_;

    return unless ( -f $filename );
    return unless ( $filename =~ /^(.*)\.([[:alnum:]]+)$/ );

    my $filestem = $1;
    my $fonttype = $2;
    my $fontdata;

    if ( $filename =~ /\.(otf|ttf)$/i ) {
	$fontdata = parse_ttf_file($filename);
    } elsif ( $filename =~ /\.(pfa|pfb)$/i ) {
	if ( -f "${filestem}.afm" ) {
	    $fontdata = parse_afm_file($filestem, $fonttype);
	}
    }

    return unless (defined($fontdata));

    my $oldinfo = $font_info_hash{$fontdata->{name}};

    if (!defined($oldinfo) ||
	$prefs{$fontdata->{type}} < $prefs{$oldinfo->{type}}) {
	$font_info_hash{$fontdata->{name}} = $fontdata;
    }
}

my $win32_ok = eval {
    require Win32::Registry;
    Win32::Registry->import();
    require Win32;
    Win32->import();
    1;
};

# Based on Font::TTF::Win32 by
# Martin Hosken <http://scripts.sil.org/FontUtils>.
# LICENSING
#
#   Copyright (c) 1998-2014, SIL International (http://www.sil.org)
#
#   This module is released under the terms of the Artistic License 2.0.
#   For details, see the full text of the license in the file LICENSE.
sub scanfonts_win32() {
    return undef unless ($win32_ok);

    my $font_key = 'SOFTWARE\Microsoft\Windows' .
	(Win32::IsWinNT() ? 'NT' : '') . '\CurrentVersion\Fonts';
    my($regfont, $list, $l, $file);

    $::HKEY_LOCAL_MACHINE->Open($font_key, $regfont);
    $regfont->GetValues($list);

    foreach my $l (keys(%$list)) {
	my $fname = $list->{$l}[0];
	next unless ($fname =~ s/\((TrueType|OpenType)\)$//);
	$file = File::Spec->rel2abs($list->{$l}[2], $ENV{'windir'}.'\fonts');
	add_file_to_font_hash($file)
    }
}

sub font_search_file() {
    my($fontdata, $filestem, $fonttype);

    add_file_to_font_hash($_);
}

sub findfont($) {
    my($fontname) = @_;
    my $win32 = eval {
	require Font::TTF::Win32;
	Font::TTF::Win32->import();
	1;
    };
    my($file, $psname, $fontdata);

    if (exists($font_info_hash{$fontname})) {
	return $font_info_hash{$fontname};
    }

    # Are we on a system that uses fontconfig?
    if (!defined($file) &&
	open(my $fh, '-|', 'fc-match',
	     '-f', '%{file}\n%{postscriptname}\n',
	     " : postscriptname=$fontname")) {
	chomp($file = <$fh>);
	chomp($psname = <$fh>);
	close($fh);
	if ( -f $file ) {
	    if ($psname eq $fontname) {
		add_file_to_font_hash($file);
	    }
	    if (!exists($font_info_hash{$fontname})) {
		$font_info_hash{$fontname} = undef;
	    }
	    return $font_info_hash{$fontname};
	}
    }

    if (exists($font_info_hash{$fontname})) {
	return $font_info_hash{$fontname};
    } elsif ($fonts_scanned >= 1) {
	return $font_info_hash{$fontname} = undef;
    }

    if ($win32) {
	scanfonts_win32();
	$fonts_scanned = 1;
    }

    if (exists($font_info_hash{$fontname})) {
	return $font_info_hash{$fontname};
    } elsif ($fonts_scanned >= 2) {
	return $font_info_hash{$fontname} = undef;
    }

    # Search a set of possible locations for a file, from a few different
    # systems...
    my @dirs = ('fonts', '/usr/share/fonts', '/Library/Fonts');
    push @dirs, $ENV{'windir'}.'\fonts' if (defined $ENV{'windir'});
    push @dirs, $ENV{'HOME'}.'/.fonts', $ENV{'HOME'}.'/Library/Fonts'
	if (defined $ENV{'HOME'});

    find({wanted => \font_search_file, follow=>1, no_chdir=>1}, @dirs);
    $fonts_scanned = 2;

    return $font_info_hash{$fontname};
}

1;