Update stuff

src/de/steamwar/lobby/map/CustomMap.java

@@ -30,6 +30,7 @@ import org.bukkit.map.MapPalette;
 
 import java.awt.*;
 import java.awt.image.BufferedImage;
+import java.awt.image.WritableRaster;
 import java.lang.reflect.Field;
 
 public class CustomMap {
@@ -42,6 +43,50 @@ public class CustomMap {
             throw new IllegalArgumentException("Image height must be a multiple of 128");
         }
 
+        final double multiplier1 = 7 / 16.0;
+        final double multiplier2 = 3 / 16.0;
+        final double multiplier3 = 5 / 16.0;
+        final double multiplier4 = 1 / 16.0;
+        WritableRaster raster = image.getRaster();
+        int numBands = raster.getNumBands();
+        int[] pixels = raster.getPixels(0, 0, image.getWidth(), image.getHeight(), new int[image.getWidth() * image.getHeight() * numBands]);
+        for (int y = 0; y < image.getHeight(); y++) {
+            for (int x = 0; x < image.getWidth(); x++) {
+                int red = pixels[(y * image.getWidth() + x) * numBands];
+                int green = pixels[(y * image.getWidth() + x) * numBands + 1];
+                int blue = pixels[(y * image.getWidth() + x) * numBands + 2];
+                Color nearest = getNearest(new Color(red, green, blue));
+                pixels[(y * image.getWidth() + x) * numBands] = nearest.getRed();
+                pixels[(y * image.getWidth() + x) * numBands + 1] = nearest.getGreen();
+                pixels[(y * image.getWidth() + x) * numBands + 2] = nearest.getBlue();
+
+                int quantErrorRed = red - nearest.getRed();
+                int quantErrorGreen = green - nearest.getGreen();
+                int quantErrorBlue = blue - nearest.getBlue();
+                if (x < image.getWidth() - 1) {
+                    pixels[(y * image.getWidth() + x + 1) * numBands] = clamp((int) (pixels[(y * image.getWidth() + x + 1) * numBands] + quantErrorRed * multiplier1));
+                    pixels[(y * image.getWidth() + x + 1) * numBands + 1] = clamp((int) (pixels[(y * image.getWidth() + x + 1) * numBands + 1] + quantErrorGreen * multiplier1));
+                    pixels[(y * image.getWidth() + x + 1) * numBands + 2] = clamp((int) (pixels[(y * image.getWidth() + x + 1) * numBands + 2] + quantErrorBlue * multiplier1));
+                }
+                if (x > 0) {
+                    pixels[(y * image.getWidth() + x - 1) * numBands] = clamp((int) (pixels[(y * image.getWidth() + x - 1) * numBands] + quantErrorRed * multiplier2));
+                    pixels[(y * image.getWidth() + x - 1) * numBands + 1] = clamp((int) (pixels[(y * image.getWidth() + x - 1) * numBands + 1] + quantErrorGreen * multiplier2));
+                    pixels[(y * image.getWidth() + x - 1) * numBands + 2] = clamp((int) (pixels[(y * image.getWidth() + x - 1) * numBands + 2] + quantErrorBlue * multiplier2));
+                }
+                if (y < image.getHeight() - 1) {
+                    pixels[((y + 1) * image.getWidth() + x) * numBands] = clamp((int) (pixels[((y + 1) * image.getWidth() + x) * numBands] + quantErrorRed * multiplier3));
+                    pixels[((y + 1) * image.getWidth() + x) * numBands + 1] = clamp((int) (pixels[((y + 1) * image.getWidth() + x) * numBands + 1] + quantErrorGreen * multiplier3));
+                    pixels[((y + 1) * image.getWidth() + x) * numBands + 2] = clamp((int) (pixels[((y + 1) * image.getWidth() + x) * numBands + 2] + quantErrorBlue * multiplier3));
+                    if (x < image.getWidth() - 1) {
+                        pixels[((y + 1) * image.getWidth() + x + 1) * numBands] = clamp((int) (pixels[((y + 1) * image.getWidth() + x + 1) * numBands] + quantErrorRed * multiplier4));
+                        pixels[((y + 1) * image.getWidth() + x + 1) * numBands + 1] = clamp((int) (pixels[((y + 1) * image.getWidth() + x + 1) * numBands + 1] + quantErrorGreen * multiplier4));
+                        pixels[((y + 1) * image.getWidth() + x + 1) * numBands + 2] = clamp((int) (pixels[((y + 1) * image.getWidth() + x + 1) * numBands + 2] + quantErrorBlue * multiplier4));
+                    }
+                }
+            }
+        }
+        raster.setPixels(0, 0, image.getWidth(), image.getHeight(), pixels);
+
         BufferedImage bufferedImage = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_RGB);
         for (int y = 0; y < image.getHeight(); y++) {
             for (int x = 0; x < image.getWidth(); x++) {