Now creates compressed fonts. Yay!
This commit is contained in:
Stefan `Sec` Zehl
parent
0f3f4b951c
commit
ef50bdb98d
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@ -3,6 +3,18 @@ use GD;
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use strict;
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use warnings;
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$|=1;
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#for(1..500){
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# printf "%3d | %-10s | %-10s\n",
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# $_,
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# join(" ",map {sprintf "%x",$_} (0,pk_encode_long($_))),
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# join(" ",map {sprintf "%x",$_} pk_encode_long($_+16));
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#}
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#exit(1);
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use constant VERBOSE=>0;
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###
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### Configure me
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###
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@ -13,8 +25,13 @@ for(32..126){
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};
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my $size=shift||17;
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my $font="/usr/local/lib/X11/fonts/bitstream-vera/Vera.ttf";
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my $title="Bitstream Vera Sans ".$size."pt";
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my ($font,$title);
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$font="/usr/local/lib/X11/fonts/bitstream-vera/Vera.ttf";
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$title="Bitstream Vera Sans ".$size."pt";
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#$font="./Comic_Sans_MS_KOI8.ttf";
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#$title="Comic Sans ".$size."pt";
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###
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### Code starts here.
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@ -24,6 +41,10 @@ my $width=2000;
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my $height=100;
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my $xoff=30;
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my $origsize;
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my $c1size;
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my $c2size;
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my $fonts=$title;
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$fonts=~s/ //g;
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$fonts=~s/Bitstream//;
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@ -98,6 +119,7 @@ EOF
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;
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my $offset=0;
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my $maxsz=0;
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my @offsets;
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for (1..length$charlist){
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my $char=substr($charlist,$_-1,1);
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@ -118,19 +140,96 @@ for (1..length$charlist){
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};
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# print "<\n";
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};
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print C "/* '",$char,"' at $offset */\n";
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print "### Start $char\n" if(VERBOSE);
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print C " /* Char ",ord $char," is ",scalar@char,"px wide \@ $offset */\n";
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$maxsz=scalar@char if scalar@char > $maxsz;
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$origsize+=$byte * scalar @char;
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# Whoops. Characters are upside down.
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for (@char){
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$_=reverse $_;
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};
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### PK compression
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my @enc=do_pk(\@char);
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$c2size+=scalar(@enc);
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### Lame compression
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# "compress" blank spaces
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my $preblank=0;
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while(defined $char[1] && $char[0]=~/^0+$/){
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shift@char;
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$preblank++;
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};
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my $postblank=0;
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while($#char>0 && $char[$#char]=~/^0+$/){
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$#char--;
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$postblank++;
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};
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$c1size+=$byte*scalar@char;
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my @raw;
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### Raw character data
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for (@char){
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my $h= pack("B*",$_).(chr(0).chr(0));
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for my $b (1..$byte){
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printf C "0x%02x,",ord(substr($h,$b-1,1));
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push @raw,ord(substr($h,$b-1,1));
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};
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$_=~y/01/ */;
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print C " /* $_ */ \n";
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};
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push @offsets,sprintf " {%2d,%4d}, /* %s */\n",scalar(@char),$offset,$char;
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$offset+=scalar(@char)*$byte;
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# print "-"x80,"\n";
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# Maintenance overhead
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$origsize+=1;
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$c1size+=3;
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$c2size+=1;
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# If encoding is bigger, fall back to original char
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my $rawpretty=0;
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if($#enc>$#raw+3){
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warn "Compression failure: Encoding char $char raw.\n";
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@enc=(255,$preblank,$postblank,@raw);
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$rawpretty=1;
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};
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# Generate C source
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if($rawpretty){
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my @out=@enc;
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printf C " 0x%02x, %2d, %2d, /* rawmode, preblank, postblank */\n",
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(shift@out), (shift@out), (shift@out);
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for (@char){
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print C " ";
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printf C "0x%02x, ",shift@out for(1..$byte);
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$_=~y/01/ */;
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print C " /* $_ */ \n";
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};
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}else{
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for (@char){
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$_=~y/01/ */;
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print C " /* $_ */ \n";
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};
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my $pretty=0;
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for(@enc){
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print C " " if($pretty==0);
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printf C "0x%02x, ",$_;
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if(++$pretty==8){
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print C "\n" ;
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$pretty=0;
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};
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};
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};
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print C "\n";
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push @offsets,sprintf " {%2d}, /* %s */\n",scalar(@enc),$char;
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print C "\n";
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$offset+=scalar(@enc);
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if(VERBOSE){
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print "-"x80,"\n";
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};
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};
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@ -138,22 +237,24 @@ print C <<EOF;
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};
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/* Character descriptors */
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const FONT_CHAR_INFO ${fonts}Descriptors[] = {
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const FONT_CHAR_INFO ${fonts}Lengths[] = {
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EOF
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print C @offsets;
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my($first)=ord substr($charlist,0,1);
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my($last)=$first+length($charlist)-1;
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print C <<EOF;
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};
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printf C "};
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/* Font info */
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const struct FONT_DEF Font_$fonts = {0,$pxsize,$first,$last,
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${fonts}Bitmaps,
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${fonts}Descriptors,
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const struct FONT_DEF Font_$fonts = {
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%3d, /* width (1 == comressed) */
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%3d, /* character height */
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%3d, /* first char */
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%3d, /* last char */
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%s, %s
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};
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EOF
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",1,$pxsize,$first,$last,"${fonts}Bitmaps","${fonts}Lengths";
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print H <<EOF;
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#include "fonts.h"
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@ -164,3 +265,160 @@ EOF
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close(C);
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close(H);
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print "\ndone.\n\n";
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print "Original size: $origsize\n";
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print "Simple compression: $c1size\n";
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print "PK compression: $c2size\n";
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print "Maximum character size: $byte*$maxsz bytes\n";
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exit(0);
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# subs
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sub pk_dedup {
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my $char=shift;
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my @echar=@{$char};
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# for (@echar){ print "dedup_in: $_\n"; };
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my $idx=0;
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while(++$idx<$#echar){
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# dupline code can't deal with all-0 or all-1 dupe lines
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next if ($echar[$idx]=~/^(.)(\1)+$/);
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if($echar[$idx-1] eq $echar[$idx]){
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my $dl=1;
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$dl++ while ($dl<$#echar && $echar[$idx] eq $echar[$idx+$dl]);
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# print "dupline found\n";
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if( $echar[$idx-1]=~ s/01/0[$dl]1/ ){
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$echar[$idx]="";
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@echar[$idx..($idx+$dl-1)]=();
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}elsif ($echar[$idx-1]=~ s/10/1[$dl]0/){
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$echar[$idx]="";
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@echar[$idx..($idx+$dl-1)]=();
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}else{
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die "Shouldn't happen: Can't encode dupline?";
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};
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$idx+=$dl; # Skip deduped lines.
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}
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}
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@echar=grep {defined $_} @echar;
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return \@echar;
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};
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sub pk_rle {
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my $char=shift;
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my $line=join("",@$char);;
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my $fpx=substr($line,0,1);
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warn "first pixel ==1 - Encoder will do stupid things..." if $fpx ==1 ;
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my @out;
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while($line=~/./){
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$line=~s/^(0*)(\[\d+\])?(1*)(\[\d+\])?//;
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push @out,length($1);
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push @out,$2 if defined $2;
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push @out,length($3);
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push @out,$4 if defined $4;
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};
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pop @out if ($out[$#out]==0); # Remove trailling zero
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# print "rle: ",join(",",@out),"\n";
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return @out;
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};
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###
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### Encode a "long run", i.e. big number
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###
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sub pk_encode_long {
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my $n=shift;
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my @packed;
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while($n){
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unshift @packed,$n%16;
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$n=$n>>4;
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};
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for my $undef (1..$#packed){
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unshift @packed,0;
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};
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return @packed;
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};
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###
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### Encode RLE data (with included repeat counts) into a nybble stream
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###
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### PK has "dyn" per-character, but for our font size encoding a dyn per
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### character needs more space than it saves, so it's fixed for now.
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###
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sub pk_encode {
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my @out=@_;
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my $dyn=12;
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my @enc;
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for (@out){
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if($_ =~ /\[(\d+)\]/ ){
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if($1 == 1){
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push @enc,15;
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}else{
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my $n=$1-1; # this deviates from PK spec, i think.
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push @enc,14,pk_encode_long($1-1);
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};
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}elsif($_ == 0){
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warn "Encoder asked to encode a zero?"; # Shouldn't happen.
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}elsif($_ <= $dyn){ # Short length
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push @enc,$_;
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}elsif($_ <= 16*(13-$dyn)+$dyn){ # Medium length
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my $b=($_-$dyn-1)&0x0f;
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my $a=(($_-$dyn-1)>>4)+$dyn+1;
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push @enc,$a,$b; # (16*($a-$dyn-1)+$b+$dyn+1
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}else{ # long length
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my $n=$_- (16*(13-$dyn)+$dyn) + 16;
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push @enc,pk_encode_long($n);
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};
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};
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# print "enc: ",join(",",@enc),"\n";
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return @enc;
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};
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sub make_bytes{
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my @enc=@_;
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my @out;
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while(@enc){
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push @enc,0 if($#enc==2);
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push @out,16*(shift@enc)+(shift@enc);
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};
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return @out;
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};
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sub do_pk {
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my $char=shift;
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my $size=scalar @$char * $byte;
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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){
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print "dedup: $_\n";
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};
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};
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my @rle=pk_rle ($char);
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if(VERBOSE){
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print "RLE: ",join(",",@rle),"\n";
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};
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my @enc=pk_encode (@rle);
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if(VERBOSE){
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print "encoded stream: ",join(",",@enc),"\n";
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};
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return make_bytes(@enc);
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};
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