Spout server heightmap world generator, would love some help optimizing this for use with Spout.

WHHeightMapGenerator.java

public class WHHieghtMapGenerator implements WorldGenerator {

  	private BufferedImage worldImage;

	public WHHieghtMapGenerator(String imagefile) {
		try {
			URL url = getClass().getResource("/" + imagefile);
			worldImage = ImageIO.read(url);
		} catch (IOException ex) {
			Spout.getLogger().log(Level.SEVERE, ex.getMessage(), ex);
		}
	}

	@Override
	public void generate(CuboidBlockMaterialBuffer blockData, int x, int y, int z, World world) {
		x <<= 4;
		y <<= 4;
		z <<= 4;
		final Vector3 size = blockData.getSize();
		final int sizeX = size.getFloorX();
		final int sizeY = size.getFloorY();
		final int sizeZ = size.getFloorZ();

		for (int xx = 0; xx < sizeX; xx++) {
			for (int zz = 0; zz < sizeZ; zz++) {
				int clr;
				try {
					clr = worldImage.getRGB(x + xx, z + zz);
				} catch (Exception e) {
					continue;
				}
				for (int yy = 0; yy < sizeY; yy++) {
					int red;
					red = (clr >> 16) & 0xff;
					if (y + yy <= red) {
						blockData.set(x + xx, y + yy, z + zz, BlockMaterial.SOLID_GREEN);
					} else {
						blockData.set(x + xx, y + yy, z + zz, BlockMaterial.AIR);
					}
				}
			}
		}
	}

	@Override
	public int[][] getSurfaceHeight(World world, int i, int i1) {
		int[][] heights = new int[Chunk.BLOCKS.SIZE][Chunk.BLOCKS.SIZE];
		return heights;
	}

	@Override
	public Populator[] getPopulators() {
		return new Populator[0];
	}

	@Override
	public String getName() {
		return "WHHeightMap";
	}
}