001/* 002Copyright 2006 Jerry Huxtable 003 004Licensed under the Apache License, Version 2.0 (the "License"); 005you may not use this file except in compliance with the License. 006You may obtain a copy of the License at 007 008 http://www.apache.org/licenses/LICENSE-2.0 009 010Unless required by applicable law or agreed to in writing, software 011distributed under the License is distributed on an "AS IS" BASIS, 012WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013See the License for the specific language governing permissions and 014limitations under the License. 015*/ 016 017package com.jhlabs.image; 018 019import java.awt.*; 020import java.awt.image.*; 021 022/** 023 * A filter which performs one round of the game of Life on an image. 024 */ 025public class LifeFilter extends BinaryFilter { 026 027 public LifeFilter() { 028 } 029 030 protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) { 031 int index = 0; 032 int[] outPixels = new int[width * height]; 033 034 for (int y = 0; y < height; y++) { 035 for (int x = 0; x < width; x++) { 036 int r = 0, g = 0, b = 0; 037 int pixel = inPixels[y*width+x]; 038 int a = pixel & 0xff000000; 039 int neighbours = 0; 040 041 for (int row = -1; row <= 1; row++) { 042 int iy = y+row; 043 int ioffset; 044 if (0 <= iy && iy < height) { 045 ioffset = iy*width; 046 for (int col = -1; col <= 1; col++) { 047 int ix = x+col; 048 if (!(row == 0 && col == 0) && 0 <= ix && ix < width) { 049 int rgb = inPixels[ioffset+ix]; 050 if (blackFunction.isBlack(rgb)) 051 neighbours++; 052 } 053 } 054 } 055 } 056 057 if (blackFunction.isBlack(pixel)) 058 outPixels[index++] = (neighbours == 2 || neighbours == 3) ? pixel : 0xffffffff; 059 else 060 outPixels[index++] = neighbours == 3 ? 0xff000000 : pixel; 061 } 062 063 } 064 return outPixels; 065 } 066 067 public String toString() { 068 return "Binary/Life"; 069 } 070 071} 072