#!/usr/bin/perl
# pcg@goof.com

use Gimp;
use Gimp::Fu;
use Gimp::UI;
use Fcntl;

my %replace = (
   "&" => "&amp;",
   "<" => "&lt;",
   ">" => "&gt;",
);

# read some file, make text out of it
sub read_text {
   my $fh = shift;
   local $/;
   my $data = <$fh>;
   $data;
}

register "file_colorhtml_save",
         "Saves the image as coloured html text",
         "=pod",
         "Marc Lehmann",
         "Marc Lehmann <pcg\@goof.com>",
         "1999-11-22",
         "<Save>/COLORHTML",
         "*",
         [
          [PF_RADIO,	"character_source", "where to take the characters from", 0,
          		[sourcecode => 0, textfile => 1, filename => 2]],
          [PF_FILE,	"characters",     "the filename to read or the characters to use", ""],
          [PF_STRING,   "font_size",      "the html font size (1..7 or -7 .. +7)", 2],
          [PF_BOOL,	"compatible",     "html-4.0 compliancy?", 1],
          [PF_BOOL,	"closetag",       "add closing tag?", 1],
         ],
         sub {
   my($img,$drawable,$filename,$filename2,$source,$text,$size,$html40,$closetag) = @_;
   my($new_img,$new_drawable);
   my $max;
   my $export = Gimp::UI::export_image ($new_img=$img, $new_drawable=$drawable, "COLORHTML",
                                        CAN_HANDLE_RGB);
   die __"export failed" if $export == EXPORT_CANCEL;

   my ($w,$h) = ($new_drawable->width, $new_drawable->height);
   Gimp->tile_cache_ntiles($w / Gimp->tile_width + 1);

   sysopen FILE,$filename,O_CREAT|O_TRUNC|O_WRONLY or die __"Unable to open '$filename' for writing: $!\n";

   my $data;
   if ($source == 0) {
      seek DATA, 0, 0;
      $data = read_text *DATA;
   } elsif ($source == 1) {
      local *FILE;
      open FILE, "<$text" or die "$text: $!\n";
      $data = read_text *FILE;
   } elsif ($source == 2) {
      $data = $text;
   }

   my @data;
   $data =~ y/\x21-\x7f//cd;
   @data = split //, $data;
   for (@data) {
      s/([&<>])/$replace{$1}/e;
   }
   @data = ("X") x 80 unless @data;
   my @chars;

   my $region = $new_drawable->pixel_rgn (0, 0, $w, $h, 0, 0);

   init Progress __"Saving '$filename' as COLORHTML...";

   $closetag = $closetag ? "</font>" : "";

   print FILE "<html><body bgcolor=black>\n<font size=\"$size\"><pre>\n";
   for (my $y = 0; $y < $h; $y++) {
      my $pel = $region->get_row2 (0, $y, $w);
      push @chars,@data while @chars < $w;
      if ($html40) {
         $pel =~ s{(...)}{
            "<font color=\"#".unpack("H*",$1)."\">".shift(@chars).$closetag;
         }ges;
      } else {
         $pel =~ s{(...)}{
            "<font color=".unpack("H*",$1).">".shift(@chars).$closetag;
         }ges;
      }
      
      print FILE $pel,"\n";

      update Progress $y/$h;
   }
   print FILE "</pre>\n</html>\n";

   $new_img->delete if $export == EXPORT_EXPORT;
   ();
};

Gimp::on_query {
   Gimp->register_save_handler("file_colorhtml_save", "colorhtml", "");
};

exit main;

=head1 COLORHTML FILE FORMAT

This file save filter writes a large regular grid filled with coloured
characters. The characters can be stored in file and don't have anything to do
with the image. The colour of each character, though, is taken from the image
to save.

This creates some kind of mosaic effect with characters.

The pictures should be limited to about 120x120 pixels, since most
browsers do not view larger images. The aspect ratio depends on the
fixed-width font the browser is using, and is usually around 2:1 (so you
should squash your image accordingly).

The FONT tags can be saved either HTML-4.0 compliant (C<font color="#rrggbb">)
or in a proprietary format most browsers support (C<font color=rrggbb>).
To save even more space you can leave out the closing tag (C</font>),
but this will potentially leave thousands of font elements open in the browser,
and will disturb the current font colour.

=cut

__END__

