BiomesOPlenty/common/biomesoplenty/world/layer/BiomeLayerFuzzyZoom.java

package biomesoplenty.world.layer;

import net.minecraft.world.gen.layer.IntCache;

public class BiomeLayerFuzzyZoom extends BiomeLayer
{
	public BiomeLayerFuzzyZoom(long par1, BiomeLayer par3GenLayer)
	{
		super(par1);
		super.parent = par3GenLayer;
	}

	/**
	 * Returns a list of integer values generated by this layer. These may be interpreted as temperatures, rainfall
	 * amounts, or biomeList[] indices based on the particular GenLayer subclass.
	 */
	@Override
	public int[] getInts(int par1, int par2, int par3, int par4)
	{
		int i1 = par1 >> 1;
		int j1 = par2 >> 1;
		int k1 = (par3 >> 1) + 3;
		int l1 = (par4 >> 1) + 3;
		int[] aint = parent.getInts(i1, j1, k1, l1);
		int[] aint1 = IntCache.getIntCache(k1 * 2 * l1 * 2);
		int i2 = k1 << 1;
		int j2;

		for (int k2 = 0; k2 < l1 - 1; ++k2)
		{
			j2 = k2 << 1;
			int l2 = j2 * i2;
			int i3 = aint[0 + (k2 + 0) * k1];
			int j3 = aint[0 + (k2 + 1) * k1];

			for (int k3 = 0; k3 < k1 - 1; ++k3)
			{
				this.initChunkSeed(k3 + i1 << 1, k2 + j1 << 1);
				int l3 = aint[k3 + 1 + (k2 + 0) * k1];
				int i4 = aint[k3 + 1 + (k2 + 1) * k1];
				aint1[l2] = i3;
				aint1[l2++ + i2] = this.choose(i3, j3);
				aint1[l2] = this.choose(i3, l3);
				aint1[l2++ + i2] = this.choose(i3, l3, j3, i4);
				i3 = l3;
				j3 = i4;
			}
		}

		int[] aint2 = IntCache.getIntCache(par3 * par4);

		for (j2 = 0; j2 < par4; ++j2)
		{
			System.arraycopy(aint1, (j2 + (par2 & 1)) * (k1 << 1) + (par1 & 1), aint2, j2 * par3, par3);
		}

		return aint2;
	}

	/**
	 * randomly choose between the two args
	 */
	protected int choose(int par1, int par2)
	{
		return this.nextInt(2) == 0 ? par1 : par2;
	}

	/**
	 * randomly choose between the four args
	 */
	protected int choose(int par1, int par2, int par3, int par4)
	{
		int i1 = this.nextInt(4);
		return i1 == 0 ? par1 : (i1 == 1 ? par2 : (i1 == 2 ? par3 : par4));
	}
}