    001package net.minecraft.world.gen.layer;
    002
    003public class GenLayerFuzzyZoom extends GenLayer
    004{
    005    public GenLayerFuzzyZoom(long par1, GenLayer par3GenLayer)
    006    {
    007        super(par1);
    008        super.parent = par3GenLayer;
    009    }
    010
    011    /**
    012     * Returns a list of integer values generated by this layer. These may be interpreted as temperatures, rainfall
    013     * amounts, or biomeList[] indices based on the particular GenLayer subclass.
    014     */
    015    public int[] getInts(int par1, int par2, int par3, int par4)
    016    {
    017        int i1 = par1 >> 1;
    018        int j1 = par2 >> 1;
    019        int k1 = (par3 >> 1) + 3;
    020        int l1 = (par4 >> 1) + 3;
    021        int[] aint = this.parent.getInts(i1, j1, k1, l1);
    022        int[] aint1 = IntCache.getIntCache(k1 * 2 * l1 * 2);
    023        int i2 = k1 << 1;
    024        int j2;
    025
    026        for (int k2 = 0; k2 < l1 - 1; ++k2)
    027        {
    028            j2 = k2 << 1;
    029            int l2 = j2 * i2;
    030            int i3 = aint[0 + (k2 + 0) * k1];
    031            int j3 = aint[0 + (k2 + 1) * k1];
    032
    033            for (int k3 = 0; k3 < k1 - 1; ++k3)
    034            {
    035                this.initChunkSeed((long)(k3 + i1 << 1), (long)(k2 + j1 << 1));
    036                int l3 = aint[k3 + 1 + (k2 + 0) * k1];
    037                int i4 = aint[k3 + 1 + (k2 + 1) * k1];
    038                aint1[l2] = i3;
    039                aint1[l2++ + i2] = this.choose(i3, j3);
    040                aint1[l2] = this.choose(i3, l3);
    041                aint1[l2++ + i2] = this.choose(i3, l3, j3, i4);
    042                i3 = l3;
    043                j3 = i4;
    044            }
    045        }
    046
    047        int[] aint2 = IntCache.getIntCache(par3 * par4);
    048
    049        for (j2 = 0; j2 < par4; ++j2)
    050        {
    051            System.arraycopy(aint1, (j2 + (par2 & 1)) * (k1 << 1) + (par1 & 1), aint2, j2 * par3, par3);
    052        }
    053
    054        return aint2;
    055    }
    056
    057    /**
    058     * randomly choose between the two args
    059     */
    060    protected int choose(int par1, int par2)
    061    {
    062        return this.nextInt(2) == 0 ? par1 : par2;
    063    }
    064
    065    /**
    066     * randomly choose between the four args
    067     */
    068    protected int choose(int par1, int par2, int par3, int par4)
    069    {
    070        int i1 = this.nextInt(4);
    071        return i1 == 0 ? par1 : (i1 == 1 ? par2 : (i1 == 2 ? par3 : par4));
    072    }
    073}