#!/usr/bin/perl
use 5.6.0;
use warnings;
use strict;
use Gtk; # just so that compilation fails without it
use Gimp qw(:auto);
use Gimp::Feature qw(gimp-1.2);
use Gimp::Fu;

my $head = <<EOF;
[files]
alpha arpi_osd_a.raw
bitmap arpi_osd_b.raw

[characters]
0x01 0 36
0x02 35 71
0x03 70 106
0x04 116 152
0x05 164 200
0x06 209 245
0x07 256 292
0x08 305 342
0x09 354 400
0x0A 407 442
0x0B 457 494

[files]
alpha arpi_progress_a.raw
bitmap arpi_progress_b.raw

[characters]
0x10 4 21
0x11 30 41
0x12 50 66
0x13 74 85

EOF

sub geninfo {
  my ($font, $height) = @_;

  my $size = (split("-", $font))[7];
  $font = (split("-", $font))[2];
  
  return(sprintf(<<EOF, $font, $size, int($size/2), -3-int($size/10), $size));
[info]
name "%s \@%d; created in gimp; plugin by lanzz\@lanzz.org"
descversion 1
spacewidth %d
charspace %d
height %d

EOF
}

sub basename($) {
  my ($f) = @_;
  $f =~ m#([^/]*)$#;
  return($1);
}

sub render_subfont {
  my ($font, $bfile, $afile, $dfile, $keep) = @_;

  my ($raw) = gimp_procedural_db_query("^file_raw_save\$", "","","","","","");
  if ($raw ne "file_raw_save") {
    gimp_message("HSI Raw plugin not installed");
    return(undef);
  }

  unless (open(D, "> $dfile")) {
    gimp_message("Cannot write to $dfile");
    return(undef);
  }

  my @size = xlfd_size($font);
  $size[0] *= 2;

  my (undef, $h) = gimp_text_get_extents_fontname(join("", map(chr($_), 33 .. 255)), @size, $font);
  $h += 10;
  my $w = 0;
  gimp_palette_set_foreground([255, 255, 255]);
  gimp_palette_set_background([0, 0, 0]);

  my $img = gimp_image_new(1, $h, GRAY);
  gimp_image_undo_disable($img);
  gimp_image_set_filename($img, $bfile);
  my $draw = gimp_layer_new($img, 1, $h, GRAY_IMAGE, "subfont", 100, NORMAL_MODE);
  gimp_image_add_layer($img, $draw, 0);
  gimp_edit_fill($draw, BG_IMAGE_FILL);

  my $x = 0;
  print D (geninfo($font));
  print D ($head);
  printf D (<<EOF, basename($afile), basename($bfile));
[files]
alpha %s
bitmap %s

EOF
  
  print D ("[characters]\n");
  gimp_progress_init("Rendering font...");
  for (my $c = 33; $c <= 255; $c++) {
    my ($cw) = gimp_text_get_extents_fontname(chr($c), @size, $font);
    printf D ("0x%02X %d %d\n", $c, int($x / 2), int(($x + $cw + 5) / 2));
    $cw = (int($cw / 8) + 2) * 8;
    $w += $cw;
    gimp_image_resize($img, $w, $h, 0, 0);
    gimp_layer_resize($draw, $w, $h, 0, 0);
    gimp_floating_sel_anchor(gimp_text_fontname($img, $draw, $x + 5, 5, chr($c), -1, 1, @size, $font));
    $x += $cw;
    gimp_progress_update(($c - 33) / 222);
  }
  close(D);

  gimp_image_scale($img, int($w / 2), int($h / 2));
  gimp_image_undo_enable($img);
  file_raw_save($img, $draw, $bfile, $bfile);

  my $aimg = gimp_channel_ops_duplicate($img);
  gimp_image_undo_disable($aimg);
  gimp_image_set_filename($aimg, $afile);
  $draw = gimp_image_flatten($aimg);
  gimp_by_color_select($draw, [0, 0, 0], 15, REPLACE, 1, 0, 0, 0);
  gimp_selection_invert($aimg);
  gimp_selection_grow($aimg, 1);
  gimp_edit_fill($draw, FG_IMAGE_FILL);
  gimp_selection_clear($aimg);
  plug_in_gauss_rle2($img, $draw, 3, 3);
  gimp_image_undo_enable($aimg);
  file_raw_save($aimg, $draw, $afile, $afile);

  gimp_message(<<EOF);
Render done.

Bitmap: $bfile
Alpha: $afile
Desc: $dfile
EOF
  if ($keep) {
    gimp_image_clean_all($img);
    gimp_image_clean_all($aimg);
    return($img, $aimg);
  } else {
    return(undef);
  }
}

sub render_subfont_alpha {
  my ($img) = @_;
  
  my $aimg = gimp_channel_ops_duplicate($img);
  gimp_image_undo_disable($aimg);
  gimp_image_set_filename($aimg, "alpha.raw");
  my $draw = gimp_image_flatten($aimg);
  gimp_by_color_select($draw, [0, 0, 0], 15, REPLACE, 1, 0, 0, 0);
  gimp_selection_invert($aimg);
  gimp_selection_grow($aimg, 1);
  gimp_edit_fill($draw, FG_IMAGE_FILL);
  gimp_selection_clear($aimg);
  plug_in_gauss_rle2($img, $draw, 3, 3);
  gimp_image_undo_enable($aimg);

  return($aimg);
}

register(
  "render_subfont",
  "Render a grayscale MPlayer subtitle font",
  "No help (yet)",
  "lanzz\@lanzz.org",
  "Copyright 2001, lanzz\@lanzz.org",
  "2001-07-31",
  "<Toolbox>/Xtns/MPlayer/Render Subfont",
  undef,
  [
    [PF_FONT, "font", "", "-*-arial-medium-r-normal-*-16-*-*-*-*-*-*-*", undef],
    [PF_FILE, "bitmap", "", "bitmap.raw", undef],
    [PF_FILE, "alpha", "", "alpha.raw", undef],
    [PF_FILE, "desc", "", "font.desc", undef],
    [PF_TOGGLE, "toggle", "Keep images opened", 0, undef]
  ],
  [ ],
  [ ],
  \&render_subfont
);

register(
  "render_subfont_alpha",
  "Render alpha shadow for MPlayer subtitle font",
  "No help (yet)",
  "lanzz\@lanzz.org",
  "Copyright 2001, lanzz\@lanzz.org",
  "2001-07-31",
  "<Image>/Filters/MPlayer/Render Shadow",
  "GRAY",
  [ ],
  [ PF_IMAGE ],
  [ ],
  \&render_subfont_alpha
);

exit(main());