#!/bin/sh

#
# Creates a mosaic animation of three animations of same length.

# Input files:
#   ../bomb0/tile-####.png
#   ../bomb1/tile-####.png
#   ../bomb2/tile-####.png
#   palette.ppm
# Temporary files:
#   a.miff
#   b.miff
#   c.miff
#   tmp.ppm
# Intermediate output files:
#   tile-####.gif
# Final output file:
#   out.gif
#
# Uses programs:
#   Imagemagick (convert, montage)
#   Netpbm (ppmtogif)
#   gifsicle (gifsicle)
#

crop="-crop 344x928+360+0 -filter triangle +dither -resize 256x640"

for s in `seq 0 1038`;do
  n=`printf %04d $s`
  f=tile-"$n".png
  
  rm -f a.miff b.miff c.miff
  convert ../bomb0/$f $crop a.miff &
  convert ../bomb1/$f $crop b.miff &
  convert ../bomb2/$f $crop c.miff &
  wait
  montage \
  	-background '#404040' \
  	-filter triangle  \
  	-geometry 256x640+2+2 \
  	a.miff \
  	b.miff \
  	c.miff \
  	tmp.ppm && \
  ( ppmtogif -mapfile palette.ppm < tmp.ppm > tile-"$n".gif & )
done

gifsicle -O2 -k 4 -o out.gif -l0 `for s in tile*.gif;do echo "-d 7 $s";done`