use strict;
use warnings;
use feature 'say';
use Imager;
use MCE::Loop;
use Time::HiRes 'time';
use GD;

STDOUT->autoflush;

my $start = time;
my $count = 0;
my @data;
my $bkg;

my $TEST_GD = $ARGV[ 0 ] // 1;

MCE::Loop->init(
  max_workers => MCE::Util::get_ncpu(),
  chunk_size  => 40,
  init_relay  => '',
  gather      => sub {
    if (@_ == 1) {
      print "\r", $count++;
    } else {
      push @data, @{ $_[1] };
    }
  },
  user_begin => sub {
    $bkg = Imager->new(xsize=>800, ysize=>600);
    $bkg->filter(type=>"gradgen", 
                 xo=>[ 100, 300, 600 ], 
                 yo=>[ 100, 300, 100 ],
                 colors=>[ qw(red blue green) ]);
    $bkg->filter(type=>"noise", amount=>12, subtype=>0)
  },    
);

mce_loop {
  my ($mce, $chunk_ref, $chunk_id) = @_;
  my @i_data;

  for my $x (@{ $chunk_ref }) {
    my $i = $bkg-> copy;

    $i->string(
      text  => $x,
      color => Imager::Color->new('ffffff'),
      font  => Imager::Font->new(
      # file  => '/usr/share/fonts/truetype/msttcorefonts/cour.ttf',
      # file  => '/System/Library/Fonts/Courier.dfont',
        face  => 'Courier New', # mswin
        size  => 420,
        aa    => 1),
      x     => 25,
      y     => 500,
    );

    $i->write(data => \my $data, type => 'gif');
    
    push @i_data, $data;

    MCE->gather($x);
  }

  MCE::relay { MCE->gather($chunk_id, \@i_data) };

} [ 0 .. 319 ];

MCE::Loop->finish;

print " frame GIF done!\n";
printf "compute time: %0.3fs\n", time - $start;

if ( $TEST_GD ) {
    my $image   = GD::Image-> newFromGifData( $data[ 0 ]);
    my $gifdata = $image-> gifanimbegin(0,0);
    $gifdata   .= $image-> gifanimadd( 1,0,0,1,1 );
    for (1..$#data) {
       my $frame = GD::Image-> newFromGifData( $data[ $_ ]);
       $gifdata .= $frame-> gifanimadd( 1,0,0,1,1 );
    }
    $gifdata   .= $image-> gifanimend;
    open my $fh, '>', 'gd.gif';
    binmode $fh;
    print $fh $gifdata;
    close $fh;
}
else {
    Imager->write_multi({
      file => 'im.gif', type => 'gif', gif_loop => 0, gif_delay => 1,
    }, map { Imager->new(data => \$_) } @data) or die Imager->errstr;
}

printf "Total: %0.3fs\n", time - $start;

__END__

319 frame GIF done!
compute time: 10.932s
Total: 45.646s

319 frame GIF done!
compute time: 10.738s
Total: 17.107s