crashtest-r0ket/tools/makefont.pl

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#!/usr/bin/perl
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# makefont.pl - by <sec@42.org> 05/2011, BSD Licence
#
# This script rasterizes a font at a given size, then compresses it using a
# simple RLE encoding and writes its definition into compilable .c/.h files
# Rasterisation is done via GD which in turn uses freetype
# Compression is done similar to the PK compressed fonts used by LaTex
# For a verbose description see:
# - <http://www.davidsalomon.name/DC4advertis/PKfonts.pdf> or
# - <http://www.tug.org/TUGboat/tb06-3/tb13pk.pdf>
use strict;
use warnings;
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use Getopt::Long;
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use Module::Load;
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$|=1;
###
### Configure me
###
my @charlist=(32..126,0x20ac); #,0x3044 # hiragana I
push @charlist,map {ord $_} qw(<EFBFBD> <20> <20> <20> <20> <20> <20>);
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###
### Runtime Options
###
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my ($verbose,$raw);
my $size=18;
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my $font="../ttf/Ubuntu-Regular.ttf";
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$font="6x9.bdf";
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GetOptions ("size=i" => \$size, # numeric
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"font=s" => \$font, # string
"verbose" => \$verbose, # flag
"raw" => \$raw, # flag
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"help" => sub {
print <<HELP;
Uasge: makefont.pl [-r] [-v] [-f fontfile] [-s size]
Options:
--verbose Be verbose.
--raw Create raw/uncompressed font.
--font <filename> Source .ttf file to use. [Default: $font]
--size <size> Pointsize the font should be rendered at. [Default: $size]
HELP
exit(-1);}
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);
my ($type);
if($font=~/\.ttf/){
$type="ttf";
}elsif($font=~/\.bdf/){
$type="bdf";
}else{
die "Can only do .ttf or .bdf fonts\n";
};
###
### Code starts here.
###
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my $origsize;
my $c1size;
my $c2size;
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our ($licence);
our ($title,$fonts);
our ($heightb,$heightpx);
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@charlist=sort { $a <=> $b } @charlist;
$::{"init_$type"}();
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die "No font name?" if !defined $title;
my $file=$fonts;
$file=~s/pt$//;
$file=~y/A-Z/a-z/;
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$file.="-raw" if($raw);
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print "Writing $title to ${file}.c\n";
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$heightb=int(($heightpx-1)/8)+1; # Round up
print "Chars are ",$heightpx,"px ($heightb bytes) high\n";
open (C,">",$file.".c")||die;
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if(defined $licence){
$licence=~s/\n/\n * /g;
$licence="\n/* ".$licence."\n */";
}else{
$licence="";
};
print C <<EOF
#include "$file.h"
/* Font data for $title */
$licence
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/* This file created by makefont.pl by Sec <sec\@42.org> */
/* Bitmaps */
const uint8_t ${fonts}Bitmaps[] = {
EOF
;
my $offset=0;
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my $maxsz=0;
my @offsets;
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for (0..$#charlist){
my $char=chr $charlist[$_];
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print "### Start $char\n" if($verbose);
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my @char=$::{"render_$type"}($_);
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print C " /* Char ",ord $char," is ",scalar@char,"px wide \@ $offset */\n";
$maxsz=scalar@char if scalar@char > $maxsz;
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$origsize+=$heightb * scalar @char;
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# Whoops. Characters are upside down.
for (@char){
$_=reverse $_;
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};
### PK compression
my @enc=do_pk(\@char);
$c2size+=scalar(@enc);
### Lame compression
# "compress" blank spaces
my $preblank=0;
while(defined $char[1] && $char[0]=~/^0+$/){
shift@char;
$preblank++;
};
my $postblank=0;
while($#char>0 && $char[$#char]=~/^0+$/){
$#char--;
$postblank++;
};
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$c1size+=$heightb*scalar@char;
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my @raw;
### Raw character data
for (@char){
my $h= pack("B*",$_).(chr(0).chr(0));
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for my $b (1..$heightb){
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push @raw,ord(substr($h,$b-1,1));
};
};
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# Maintenance overhead
$origsize+=1;
$c1size+=3;
$c2size+=1;
# If encoding is bigger, fall back to original char
if($#enc>$#raw+3){
warn "Compression failure: Encoding char $char raw.\n";
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$raw=1;
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};
# Generate C source
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if($raw){
$c2size-=scalar(@enc);
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@enc=(255,$preblank,$postblank,@raw);
$c2size+=scalar(@enc);
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my @out=@enc;
printf C " 0x%02x, %2d, %2d, /* rawmode, preblank, postblank */\n",
(shift@out), (shift@out), (shift@out);
for (@char){
print C " ";
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printf C "0x%02x, ",shift@out for(1..$heightb);
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$_=~y/01/ */;
print C " /* $_ */ \n";
};
}else{
for (@char){
$_=~y/01/ */;
print C " /* $_ */ \n";
};
my $pretty=0;
for(@enc){
print C " " if($pretty==0);
printf C "0x%02x, ",$_;
if(++$pretty==8){
print C "\n" ;
$pretty=0;
};
};
};
print C "\n";
push @offsets,sprintf " {%2d}, /* %s */\n",scalar(@enc),$char;
print C "\n";
$offset+=scalar(@enc);
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if($verbose){
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print "-"x80,"\n";
};
};
print C <<EOF;
};
/* Character descriptors */
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const FONT_CHAR_INFO ${fonts}Lengths[] = {
EOF
print C @offsets;
my($first)=$charlist[0];
my($last)=$first-1;
for(@charlist){
last unless $_ == $last+1;
$last++;
};
print C <<EOF;
};
const uint16_t ${fonts}Extra[] = {
EOF
print C join(",",@charlist[($last-$first+1)..$#charlist],0xffff);
printf C "
};
/* Font info */
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const struct FONT_DEF Font_$fonts = {
%3d, /* width (1 == comressed) */
%3d, /* character height */
%3d, /* first char */
%3d, /* last char */
%s, %s, %s
};
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",1,$heightpx,$first,$last,"${fonts}Bitmaps","${fonts}Lengths","${fonts}Extra";
printf C "\n";
printf C "/* Font metadata: \n";
printf C " * Name: %s\n", $title;
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printf C " * Height: %d px (%d bytes)\n", $heightpx,$heightb;
printf C " * Maximum width: %d px\n",$maxsz;
printf C " * Storage size: %d bytes (compressed by %2d%%)\n",
$c2size,(1-$c2size/$origsize)*100;
printf C " */\n";
close(C);
open (H,">",$file.".h")||die;
print H <<EOF;
#include "lcd/fonts.h"
extern const struct FONT_DEF Font_$fonts;
EOF
close(H);
print "\ndone.\n" if($verbose);
print "\n";
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print "Original size: $origsize\n";
print "Simple compression: $c1size\n";
print "PK compression: $c2size\n";
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print "Maximum character size is: $heightb*$maxsz bytes\n";
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exit(0);
# subs
sub pk_dedup {
my $char=shift;
my @echar=@{$char};
# for (@echar){ print "dedup_in: $_\n"; };
my $idx=0;
while(++$idx<$#echar){
# dupline code can't deal with all-0 or all-1 dupe lines
next if ($echar[$idx]=~/^(.)(\1)+$/);
if($echar[$idx-1] eq $echar[$idx]){
my $dl=1;
$dl++ while ($idx+$dl<$#echar && $echar[$idx] eq $echar[$idx+$dl]);
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# print "dupline found\n";
if( $echar[$idx-1]=~ s/01/0[$dl]1/ ){
$echar[$idx]="";
@echar[$idx..($idx+$dl-1)]=();
}elsif ($echar[$idx-1]=~ s/10/1[$dl]0/){
$echar[$idx]="";
@echar[$idx..($idx+$dl-1)]=();
}else{
die "Shouldn't happen: Can't encode dupline?";
};
$idx+=$dl; # Skip deduped lines.
}
}
@echar=grep {defined $_} @echar;
return \@echar;
};
sub pk_rle {
my $char=shift;
my $line=join("",@$char);;
my @out;
while($line=~/./){
$line=~s/^(0*)(\[\d+\])?(1*)(\[\d+\])?//;
push @out,length($1);
push @out,$2 if defined $2;
push @out,length($3);
push @out,$4 if defined $4;
};
pop @out if ($out[$#out]==0); # Remove trailling zero
# print "rle: ",join(",",@out),"\n";
return @out;
};
###
### Encode a "long run", i.e. big number
###
sub pk_encode_long {
my $n=shift;
my @packed;
while($n){
unshift @packed,$n%16;
$n=$n>>4;
};
for my $undef (1..$#packed){
unshift @packed,0;
};
return @packed;
};
###
### Encode RLE data (with included repeat counts) into a nybble stream
###
### PK has "dyn" per-character, but for our font size encoding a dyn per
### character needs more space than it saves, so it's fixed for now.
###
sub pk_encode {
my @out=@_;
my $dyn=12;
my @enc;
for (@out){
if($_ =~ /\[(\d+)\]/ ){
if($1 == 1){
push @enc,15;
}else{
my $n=$1-1; # this deviates from PK spec, i think.
push @enc,14,pk_encode_long($1-1);
};
}elsif($_ == 0){ # Encoding a 0 will only happen at the start of
# character if "first pixel" is 1 instead of 0.
# HACK: We transmit this fact to the decoder
# by encoding a "14"-nibble which would be
# illegal at this point anyway.
push @enc,14;
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}elsif($_ <= $dyn){ # Short length
push @enc,$_;
}elsif($_ <= 16*(13-$dyn)+$dyn){ # Medium length
my $b=($_-$dyn-1)&0x0f;
my $a=(($_-$dyn-1)>>4)+$dyn+1;
push @enc,$a,$b; # (16*($a-$dyn-1)+$b+$dyn+1
}else{ # long length
my $n=$_- (16*(13-$dyn)+$dyn) + 16;
push @enc,pk_encode_long($n);
};
};
# print "enc: ",join(",",@enc),"\n";
return @enc;
};
sub make_bytes{
my @enc=@_;
my @out;
while(@enc){
push @enc,1 if($#enc==2);
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push @out,16*(shift@enc)+(shift@enc);
};
return @out;
};
sub do_pk {
my $char=shift;
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my $size=scalar @$char * $heightb;
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print "Input char is $size bytes\n" if $verbose;
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$char=pk_dedup($char);
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if($verbose){
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for (@$char){
print "dedup: $_\n";
};
};
my @rle=pk_rle ($char);
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if($verbose){
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print "RLE: ",join(",",@rle),"\n";
};
my @enc=pk_encode (@rle);
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if($verbose){
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print "encoded stream: ",join(",",@enc),"\n";
};
return make_bytes(@enc);
};
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sub getfontname {
my $file = shift;
use constant SEEK_SET => 0;
use Encode qw(decode);
my @font;
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open (my $fh,"<",$file) || die "Can't open $font: $!";
my($buf,$str);
sysread($fh,$buf,12); # OFFSET_TABLE
my($maj,$min,$num,undef,undef,undef)=unpack("nnnnnn",$buf);
die "It's not a truetype font!" if ($maj != 1 || $min != 0);
for(1..$num){
sysread($fh,$buf,16); # TABLE_DIRECTORY
my($name,undef,$off1,$len)=unpack("A4NNN",$buf);
if ($name eq "name"){
seek($fh,$off1,SEEK_SET);
sysread($fh,$buf,6);
my(undef,$cnt,$off2)=unpack("nnn",$buf);
sysread($fh,$buf,12*$cnt);
while(length($buf)){
my(undef,$enc,undef,$id,$len,$off3)=unpack("nnnnnn",$buf);
substr($buf,0,12)="";
seek($fh,$off1+$off2+$off3,SEEK_SET);
sysread($fh,$str,$len);
if($enc==1){
$str=decode("UCS-2",$str);
};
# 0 Copyright notice
# 1 Font Family name.
# 2 Font Subfamily name.
# 3 Unique font identifier.
# 4 Full font name.
# 5 Version string.
# 6 Postscript name for the font.
# 7 Trademark
# 8 Manufacturer Name.
# 9 Designer.
# 10 Description.
# 11 URL Vendor.
# 12 URL Designer.
# 13 License description
# 14 License information URL.
$font[$id]=$str;
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# print "- $str\n";
};
last;
};
};
my($fontname,$licence);
$fontname=$font[1];
if(defined $font[2]){
$fontname.=" ".$font[2];
}elsif (defined $font[4]){
$fontname=$font[4];
};
$licence=$font[0]."\n";
$licence.="\n".$font[13]."\n" if defined $font[13];
$licence.="\nSee also: ".$font[14]."\n" if defined $font[14];
if(wantarray()){
return ($fontname,$licence);
}else{
return $fontname;
};
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};
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######################################################################
our $bdf;
our %chars;
sub init_bdf{
($title,$licence)=($font,"<licence>");
my($bb);
open($bdf,"<",$font) || die;
while(<$bdf>){
chomp;
/^PIXEL_SIZE (.*)/ && do { $heightpx=$1;$heightpx+=0;};
# /^FONT_ASCENT (.*)/ && do {$fonta=$1};
# /^FONT_DESCENT (\d+)/ && do {$fontd=$1;$byte=int(($fonta+$fontd-1)/8)+1;print "This will be a $byte byte font\n";};
# /^DWIDTH (\d+) (\d+)/ && do {$width=$1;die "H-offset?" if $2!=0};
/^FACE_NAME "(.*)"/ && do {$font=$1;};
/^COPYRIGHT "(.*)"/ && do {$licence=$1;};
/^FAMILY_NAME "(.*)"/ && do {$title=$1;};
/^FONTBOUNDINGBOX (\d+) (\d+)/ && do {$bb="$1x$2";};
last if /^ENDPROPERTIES/;
};
$title.="-".$bb;
$fonts=$title;
$fonts=~s/[ -]//g;
my($bbw,$bbh,$bbx,$bby);
my($ccode,$inchar,@bchar);
while(<$bdf>){
chomp;
/^ENDCHAR/ && do {
warn "Char $ccode has strange height?\n" if ($#bchar+1 != $bbh);
for (1..$bby){
push @bchar,("0"x$bbw);
};
for (@bchar){
$_=("0"x$bbx).$_;
};
$inchar=0;
my $tw=length($bchar[0]);
my $th=$#bchar;
my @tchar;
@tchar=();
for my $xw (1..$tw){
my $pix="";
for my $yw (0..$th){
$pix.=substr($bchar[$yw],$xw-1,1);
};
push @tchar,$pix;
};
$chars{$ccode}=[@tchar];
# print "Char: $ccode:\n",join("\n",@tchar),"\nEND\n";
@bchar=();
};
if($inchar){
my $x=unpack("B*",pack("H*",$_));
$x=substr($x,0,$bbw);
push @bchar,$x;
# $x=~y/01/ */;
# print $x,"\n";
next;
};
/^BITMAP/ && do {$inchar=1;};
/^ENCODING (.*)/ && do {$ccode=$1; };
/^BBX (\d+) (\d+) (\d+) ([-\d]+)/ && do {$bbw=$1;$bbh=$2;$bbx=$3;$bby=$4;};
};
close($bdf);
};
sub render_bdf{
my $ccode=$charlist[shift];
my $tchar=$chars{$ccode};
# print "Char: $ccode:\n",join("\n",@{$tchar}),"\nEND\n";
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return @{$tchar};
};
######################################################################
our($charlist);
our($height,$width,$xoff);
our($mx,$my);
our($top,$bottom);
sub init_ttf {
load GD;
($height,$width,$xoff)=(100,5000,90);
($title,$licence)=getfontname($font);
die "Couldn't get font name?" if !defined $title;
$title.=" ${size}pt";
$fonts=$title;
$fonts=~s/[ -]//g;
$fonts=~s/Bitstream//;
$fonts=~s/Sans//;
$fonts=~s/Regular//;
$charlist=join("",map {chr $_} @charlist);
### Get & optimize bounding box
my $im = new GD::Image($width,$height);
my $white = $im->colorAllocate(255,255,255);
my $black = $im->colorAllocate(0,0,0);
my @bounds = $im->stringFT(-$black, $font, $size, 0, 0, $xoff,$charlist);
($mx,$my)=($bounds[2],$bounds[3]);
($top,$bottom)=($bounds[7],$my);
die "Increase width" if $mx>$width;
die "Increase height" if $my>$width;
die "Increase xoff" if $bounds[7]<0;
my $found;
# Cut whitespace at top
do {
$found=0;
for my $x (0..$mx){
if( $im->getPixel($x,$top) == 1){
$found=1;last;
}
};
$top++;
}while($found==0);
$top--;
# Cut whitespace at bottom.
do {
$found=0;
for my $x (0..$mx){
if( $im->getPixel($x,$bottom) == 1){
$found=1;last;
}
};
$bottom--;
}while($found==0);
$bottom++;
$heightpx=$bottom-$top+1;
print "Removed ",$top-$bounds[7],"px at top\n";
print "Removed ",$my-$bottom,"px at bottom\n";
};
sub render_ttf{
my $char=substr($charlist,shift,1);
# create a new image
my $im = new GD::Image(2*$height,$height);
my $white = $im->colorAllocate(255,255,255);
my $black = $im->colorAllocate(0,0,0);
my @bounds = $im->stringFT(-$black, $font, $size, 0, 0, $xoff,$char.$charlist);
my @char;
for my $y ($top..$bottom){
for my $x (0..($bounds[2]-$mx)){
my $px= $im->getPixel($x,$y);
$char[$x].=$px;
# $px=~y/01/ */; print $px;
};
# print "<\n";
};
return @char;
};