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 * Given a binary image, this filter converts it to its outline, replacing all interior pixels with the 'new' color. 024 */ 025public class OutlineFilter extends BinaryFilter { 026 027 public OutlineFilter() { 028 newColor = 0xffffffff; 029 } 030 031 protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) { 032 int index = 0; 033 int[] outPixels = new int[width * height]; 034 035 for (int y = 0; y < height; y++) { 036 for (int x = 0; x < width; x++) { 037 int pixel = inPixels[y*width+x]; 038 if (blackFunction.isBlack(pixel)) { 039 int neighbours = 0; 040 041 for (int dy = -1; dy <= 1; dy++) { 042 int iy = y+dy; 043 int ioffset; 044 if (0 <= iy && iy < height) { 045 ioffset = iy*width; 046 for (int dx = -1; dx <= 1; dx++) { 047 int ix = x+dx; 048 if (!(dy == 0 && dx == 0) && 0 <= ix && ix < width) { 049 int rgb = inPixels[ioffset+ix]; 050 if (blackFunction.isBlack(rgb)) 051 neighbours++; 052 } else 053 neighbours++; 054 } 055 } 056 } 057 058 if (neighbours == 9) 059 pixel = newColor; 060 } 061 outPixels[index++] = pixel; 062 } 063 064 } 065 return outPixels; 066 } 067 068 public String toString() { 069 return "Binary/Outline..."; 070 } 071 072} 073