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}