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.image.*; 020 021/** 022 * A filter which adds Gaussian blur to an image, producing a glowing effect. 023 * @author Jerry Huxtable 024 */ 025public class HighPassFilter extends GaussianFilter { 026 027 public HighPassFilter() { 028 radius = 10; 029 } 030 031 public BufferedImage filter( BufferedImage src, BufferedImage dst ) { 032 int width = src.getWidth(); 033 int height = src.getHeight(); 034 035 if ( dst == null ) 036 dst = createCompatibleDestImage( src, null ); 037 038 int[] inPixels = new int[width*height]; 039 int[] outPixels = new int[width*height]; 040 src.getRGB( 0, 0, width, height, inPixels, 0, width ); 041 042 if ( radius > 0 ) { 043 convolveAndTranspose(kernel, inPixels, outPixels, width, height, alpha, alpha && premultiplyAlpha, false, CLAMP_EDGES); 044 convolveAndTranspose(kernel, outPixels, inPixels, height, width, alpha, false, alpha && premultiplyAlpha, CLAMP_EDGES); 045 } 046 047 src.getRGB( 0, 0, width, height, outPixels, 0, width ); 048 049 int index = 0; 050 for ( int y = 0; y < height; y++ ) { 051 for ( int x = 0; x < width; x++ ) { 052 int rgb1 = outPixels[index]; 053 int r1 = (rgb1 >> 16) & 0xff; 054 int g1 = (rgb1 >> 8) & 0xff; 055 int b1 = rgb1 & 0xff; 056 057 int rgb2 = inPixels[index]; 058 int r2 = (rgb2 >> 16) & 0xff; 059 int g2 = (rgb2 >> 8) & 0xff; 060 int b2 = rgb2 & 0xff; 061 062 r1 = (r1 + 255-r2) / 2; 063 g1 = (g1 + 255-g2) / 2; 064 b1 = (b1 + 255-b2) / 2; 065 066 inPixels[index] = (rgb1 & 0xff000000) | (r1 << 16) | (g1 << 8) | b1; 067 index++; 068 } 069 } 070 071 dst.setRGB( 0, 0, width, height, inPixels, 0, width ); 072 return dst; 073 } 074 075 public String toString() { 076 return "Blur/High Pass..."; 077 } 078}