gistfile1.txt

package se.dflemstr.imgproc.passes

import java.awt.image.BufferedImage
import se.dflemstr.imgproc.graphics.Texture

object NearestNeighbor extends Pass {
  
  val title = "Nearest Neighbor interpolation detection"
  val description = "A pass that highlights duplicate pixels in an image."

  def output = {
    val image = input asImage
    val newImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB)
    val red = Color(1, 1, 0, 0)

    for {
      x <- 0 until width
      y <- 0 until height

      src = image(x, y)
    } {
      val candidates = for {
        dx <- -1 to 1
        if(dx != 0)

        dy <- -1 to 1
        if(dy != 0)

        newx = x + dx
        if(newx > -1 && newx < width)

        newy = y + dy
        if(newy > -1 && newy < height)
      } yield image(newx, newy)

      val newcolor = if(candidates contains src)
        (src + red) / 2
      else
        src
      newImage(x, y) = newcolor
    }
    Texture fromImage newImage
  }
}