class HomeController < ApplicationController

  include Java

  BI = java.awt.image.BufferedImage
  CS = java.awt.color.ColorSpace
  IO = javax.imageio.ImageIO

  def seeimage
	@data = params[:operation]
        filename = "#{RAILS_ROOT}/public/images/kids.jpg"
        imagefile = java.io.File.new(filename)
        bi = IO.read(imagefile)
        w = bi.getWidth
        h = bi.getHeight
        bi2 = BI.new(w, h, BI::TYPE_INT_RGB)
        big = bi2.getGraphics
	big.drawImage(bi, 0, 0, nil)
        bi = bi2
	op = nil
	case @data
          when "Grayscale"
            colorSpace = CS.getInstance(CS::CS_GRAY)
            op = java.awt.image.ColorConvertOp.new(colorSpace, nil)
          when "Negative"
	    for j in 0..255
			lut[j] = 256 - j 
           end
            jlut = lut.to_java :byte
            blut = java.awt.image.ByteLookupTable.new(0, jlut)
            op = java.awt.image.LookupOp.new(blut, nil)
          when "Brighten"
            op = java.awt.image.RescaleOp.new(1.4, -25, nil)
          when "Sharpen"
	    data = [-1, 0, -1, 0, 5, 0, -1, 0, -1]
	    dataFloat = data.to_java :float
	    metal = java.awt.image.Kernel.new(3, 3, dataFloat)
	    op = java.awt.image.ConvolveOp.new(metal)
	end
	dest = op.filter(bi, nil)
        big.drawImage(dest, 0, 0, nil);
	os = java.io.ByteArrayOutputStream.new
	IO.write(dest, "jpeg", os)
	string = String.from_java_bytes(os.toByteArray)
send_data string, :type => "image/jpeg", :disposition => "inline", :filename => "newkids.jpg"
  end

  def index 
  end

end