package net.minecraft.server;

public class GenLayerRiver extends GenLayer {

    public GenLayerRiver(long i, GenLayer genlayer) {
        super(i);
        super.a = genlayer;
    }

    public int[] a(int i, int j, int k, int l) {
        int i1 = i - 1;
        int j1 = j - 1;
        int k1 = k + 2;
        int l1 = l + 2;
        int[] aint = this.a.a(i1, j1, k1, l1);
        int[] aint1 = IntCache.a(k * l);

        for (int i2 = 0; i2 < l; ++i2) {
            for (int j2 = 0; j2 < k; ++j2) {
                int k2 = this.c(aint[j2 + 0 + (i2 + 1) * k1]);
                int l2 = this.c(aint[j2 + 2 + (i2 + 1) * k1]);
                int i3 = this.c(aint[j2 + 1 + (i2 + 0) * k1]);
                int j3 = this.c(aint[j2 + 1 + (i2 + 2) * k1]);
                int k3 = this.c(aint[j2 + 1 + (i2 + 1) * k1]);

                if (k3 == k2 && k3 == i3 && k3 == l2 && k3 == j3) {
                    aint1[j2 + i2 * k] = -1;
                } else {
                    aint1[j2 + i2 * k] = BiomeBase.RIVER.id;
                }
            }
        }

        return aint1;
    }

    private int c(int i) {
        return i >= 2 ? 2 + (i & 1) : i;
    }
}