Generate divided gif animation for Thumblr

split_gif.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'RMagick'

def split(src, n)
  width = src.columns
  height = src.rows

  crop_list = []
  n.times{ |i|
    y_start = height/n * i
    n.times{ |j|
      x_start = width/n * j
      crop_list.push( src.crop(x_start, y_start, width/n, height/n, true) )
    }
  }
  crop_list
end


def create_cropgif(src, n=2)
  sep_list = nil
  sep_list = []
  src.each do |img|
    sep_list.push(split(img, n))
  end
  sep_list.transpose
end


if $0 == __FILE__
  require 'optparse'
  return if ARGV.length != 2
  src = ARGV[0]
  srcimg = Magick::ImageList.new(src)
  n = ARGV[1].to_i
  dsts = create_cropgif( srcimg, n )
  (n*n).times do |i|
    img = Magick::ImageList.new
    dsts[i].each { |d| img.push(d) }
    img.delay = srcimg.delay
    p img.delay
    img.write( File.dirname(src) + '/' + File.basename(src, '.gif') + "#{i}.gif")
  end
end