use "std"
use "canvasfx"

graphics = window("JavaFX Image negation demo", 400, 400)
imgSource = createImage("http://lorempixel.com/400/200/")
pixels = imgSource.getPixels()
size = length(pixels)
for i = 0, i < size, i++ {
  pixel = pixels[i]
  r = (pixel >> 16) & 0xFF
  g = (pixel >> 8) & 0xFF
  b = pixel & 0xFF
  r = 255 - r
  g = 255 - g
  b = 255 - b
  pixels[i] = 0xFF000000 | (r << 16) | (g << 8) | b
}
imgNegate = createImage(imgSource.width, imgSource.height, pixels)

graphics.drawImage(imgSource, 0, 0)
graphics.drawImage(imgNegate, 0, 200)
repaint()