tests: Add displacement filter scaling test

tests/tests/swfs/visual/filters/displacement_map_scales_with_screen/Test.as

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+package  {
+
+import flash.display.Bitmap;
+import flash.filters.DisplacementMapFilter;
+import flash.geom.Point;
+import flash.display.BitmapDataChannel;
+import flash.display.BitmapData;
+import flash.geom.Rectangle;
+import flash.display.MovieClip;
+
+public class Test extends MovieClip {
+	public function Test() {
+		var displacement1  : BitmapData = new Displacement1();
+		var source1 : BitmapData = new Source1();
+
+		var filter1 = new DisplacementMapFilter(displacement1, new Point(0,0), BitmapDataChannel.RED, BitmapDataChannel.GREEN, 200, 200);
+
+		var bm1 = new Bitmap(source1);
+		bm1.smoothing = false;
+		bm1.filters = [filter1];
+
+		addChild(bm1);
+
+		for (var strength = 200; strength < 300; strength += 10) {
+			var displacement2  : BitmapData = new Displacement2();
+			var source2 : BitmapData = new Source2();
+
+			var filter2 = new DisplacementMapFilter(displacement2, new Point(0,0), BitmapDataChannel.RED, BitmapDataChannel.GREEN, strength, strength);
+
+			var bm2 = new Bitmap(source2);
+			bm2.smoothing = false;
+			bm2.y = (strength - 200) * 2;
+			bm2.x = 180;
+			bm2.filters = [filter2];
+			addChild(bm2);
+		}
+	}
+}
+
+}

tests/tests/swfs/visual/filters/displacement_map_scales_with_screen/test.toml

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+num_frames = 1
+
+[image_comparison]
+tolerance = 4
+
+[player_options]
+with_renderer = { optional = false, sample_count = 1 }
+viewport_dimensions = { width = 800, height = 400, scale_factor = 1.0 }