content: package net.minecraft.world.gen.layer;
  
  import net.minecraft.world.biome.BiomeGenBase;
  
  public class GenLayerRiver extends GenLayer {
      public GenLayerRiver(long p_i2128_1_, GenLayer p_i2128_3_) {
          super(p_i2128_1_);
          super.parent = p_i2128_3_;
      }
  
      public int[] getInts(int areaX, int areaY, int areaWidth, int areaHeight) {
          int i = areaX - 1;
          int j = areaY - 1;
          int k = areaWidth + 2;
          int l = areaHeight + 2;
          int[] aint = this.parent.getInts(i, j, k, l);
          int[] aint1 = IntCache.getIntCache(areaWidth * areaHeight);
  
          for (int i1 = 0; i1 < areaHeight; ++i1) {
              for (int j1 = 0; j1 < areaWidth; ++j1) {
                  int k1 = this.func_151630_c(aint[j1 + (i1 + 1) * k]);
                  int l1 = this.func_151630_c(aint[j1 + 2 + (i1 + 1) * k]);
                  int i2 = this.func_151630_c(aint[j1 + 1 + (i1) * k]);
                  int j2 = this.func_151630_c(aint[j1 + 1 + (i1 + 2) * k]);
                  int k2 = this.func_151630_c(aint[j1 + 1 + (i1 + 1) * k]);
  
                  if (k2 == k1 && k2 == i2 && k2 == l1 && k2 == j2) {
                      aint1[j1 + i1 * areaWidth] = -1;
                  } else {
                      aint1[j1 + i1 * areaWidth] = BiomeGenBase.river.biomeID;
                  }
              }
          }
  
          return aint1;
      }
  
      private int func_151630_c(int p_151630_1_) {
          return p_151630_1_ >= 2 ? 2 + (p_151630_1_ & 1) : p_151630_1_;
      }
  }
  