001package net.minecraft.world.gen.layer;
002
003import net.minecraft.world.biome.BiomeGenBase;
004
005public class GenLayerAddIsland extends GenLayer
006{
007    public GenLayerAddIsland(long par1, GenLayer par3GenLayer)
008    {
009        super(par1);
010        this.parent = par3GenLayer;
011    }
012
013    /**
014     * Returns a list of integer values generated by this layer. These may be interpreted as temperatures, rainfall
015     * amounts, or biomeList[] indices based on the particular GenLayer subclass.
016     */
017    public int[] getInts(int par1, int par2, int par3, int par4)
018    {
019        int i1 = par1 - 1;
020        int j1 = par2 - 1;
021        int k1 = par3 + 2;
022        int l1 = par4 + 2;
023        int[] aint = this.parent.getInts(i1, j1, k1, l1);
024        int[] aint1 = IntCache.getIntCache(par3 * par4);
025
026        for (int i2 = 0; i2 < par4; ++i2)
027        {
028            for (int j2 = 0; j2 < par3; ++j2)
029            {
030                int k2 = aint[j2 + 0 + (i2 + 0) * k1];
031                int l2 = aint[j2 + 2 + (i2 + 0) * k1];
032                int i3 = aint[j2 + 0 + (i2 + 2) * k1];
033                int j3 = aint[j2 + 2 + (i2 + 2) * k1];
034                int k3 = aint[j2 + 1 + (i2 + 1) * k1];
035                this.initChunkSeed((long)(j2 + par1), (long)(i2 + par2));
036
037                if (k3 == 0 && (k2 != 0 || l2 != 0 || i3 != 0 || j3 != 0))
038                {
039                    int l3 = 1;
040                    int i4 = 1;
041
042                    if (k2 != 0 && this.nextInt(l3++) == 0)
043                    {
044                        i4 = k2;
045                    }
046
047                    if (l2 != 0 && this.nextInt(l3++) == 0)
048                    {
049                        i4 = l2;
050                    }
051
052                    if (i3 != 0 && this.nextInt(l3++) == 0)
053                    {
054                        i4 = i3;
055                    }
056
057                    if (j3 != 0 && this.nextInt(l3++) == 0)
058                    {
059                        i4 = j3;
060                    }
061
062                    if (this.nextInt(3) == 0)
063                    {
064                        aint1[j2 + i2 * par3] = i4;
065                    }
066                    else if (i4 == BiomeGenBase.icePlains.biomeID)
067                    {
068                        aint1[j2 + i2 * par3] = BiomeGenBase.frozenOcean.biomeID;
069                    }
070                    else
071                    {
072                        aint1[j2 + i2 * par3] = 0;
073                    }
074                }
075                else if (k3 > 0 && (k2 == 0 || l2 == 0 || i3 == 0 || j3 == 0))
076                {
077                    if (this.nextInt(5) == 0)
078                    {
079                        if (k3 == BiomeGenBase.icePlains.biomeID)
080                        {
081                            aint1[j2 + i2 * par3] = BiomeGenBase.frozenOcean.biomeID;
082                        }
083                        else
084                        {
085                            aint1[j2 + i2 * par3] = 0;
086                        }
087                    }
088                    else
089                    {
090                        aint1[j2 + i2 * par3] = k3;
091                    }
092                }
093                else
094                {
095                    aint1[j2 + i2 * par3] = k3;
096                }
097            }
098        }
099
100        return aint1;
101    }
102}