made mask stretch to image size

src/imagefilters/ImageFilters.scala

@@ -115,15 +115,14 @@ object ImageFilters {
     val maskHeight: Int = if (maskWidth == 0) 0 else maskImg(0).length
 
     colorFilter(a, (col, x, y, width, height) => {
-      if (x >= maskWidth || y >= maskHeight) col
-      else {
-        val factor: Double = maskImg(x)(y)/255.0
+      val maskX: Int = (x.toDouble / width * maskWidth).toInt
+      val maskY: Int = (y.toDouble / height * maskHeight).toInt
+      val factor: Double = maskImg(maskX)(maskY)/255.0
       new Color(
         (col.getRed * factor).toInt,
         (col.getGreen * factor).toInt,
         (col.getBlue * factor).toInt
       )
-      }
     })
   }
 

src/imagefilters/ImageProcessingApp.scala

@@ -56,6 +56,9 @@ object ImageProcessingApp extends App {
 	val org = new ImageGraphics(imageFile, "Original", -768, -512)
 	val sepia = new ImageGraphics(imageFile, "Sepia", -256, -512)
 	val noise = new ImageGraphics(imageFile, "Noise", 256, -512)
+	val mask = new ImageGraphics("./res/mask.png", "Mask", -256, -256)
+	val masked = new ImageGraphics(imageFile, "Masked", 256, -256)
 	sepia.setPixelsColor(ImageFilters.sepia(org.getPixelsColor()))
 	noise.setPixelsColor(ImageFilters.noise(org.getPixelsColor(), 50))
+	masked.setPixelsColor(ImageFilters.mask(org.getPixelsColor(), mask.getPixelsBW()))
 }