Screen

public class Screen {

	public int width, height;
	public int[] pixels;
	public final int MAP_SIZE = 64;
	public final int MAP_SIZE_MASK = MAP_SIZE - 1;
	public int xOffset, yOffset;
	public int[] tiles = new int[64 * 64];
	private Random random = new Random();

	public Screen(int width,int height) {
		this.width = width;
		this.height = height;
		pixels = new int[width * height]; // 50,400

		for (int i =0; i < MAP_SIZE * MAP_SIZE; i++) {
			tiles[i] = random.nextInt(0xffffff);
		}
	}

	public void clear() {
		for(int i = 0; i < pixels.length; i++){
			pixels[i] = 0;
		}
	}

	public void renderTile(int xp, int yp, Tile tile){
		xp -= xOffset;
		yp -= yOffset;
		for (int y = 0; y < tile.sprite.SIZE; y++){
			int ya = y + yp;
			for (int x = 0; x < tile.sprite.SIZE; x++){
				int xa = x + xp;
				if(xa < -tile.sprite.SIZE || xa >= width || ya < 0 || ya >= height) break;
				if(xa < 0) xa = 0;
				if(ya < 0) ya = 0;
				pixels[xa + ya * width] = tile.sprite.pixels[x + y * tile.sprite.SIZE];
			}
		}
	}

	public void setOffset(int xOffset, int yOffset) {
		this.xOffset = xOffset;
		this.yOffset = yOffset;
	}

}