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/*
Copyright 2006 Jerry Huxtable
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package com.jhlabs.image;
import java.awt.*;
import java.awt.image.*;
import java.awt.geom.*;
/**
* A filter which performs a box blur on an image. The horizontal and vertical blurs can be specified separately
* and a number of iterations can be given which allows an approximation to Gaussian blur.
*/
public class BoxBlurFilter extends AbstractBufferedImageOp {
private int hRadius;
private int vRadius;
private int iterations = 1;
public BoxBlurFilter() {
}
public BoxBlurFilter( int hRadius, int vRadius, int iterations ) {
this.hRadius = hRadius;
this.vRadius = vRadius;
this.iterations = iterations;
}
public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
int width = src.getWidth();
int height = src.getHeight();
if ( dst == null )
dst = createCompatibleDestImage( src, null );
int[] inPixels = new int[width*height];
int[] outPixels = new int[width*height];
getRGB( src, 0, 0, width, height, inPixels );
for (int i = 0; i < iterations; i++ ) {
blur( inPixels, outPixels, width, height, hRadius );
blur( outPixels, inPixels, height, width, vRadius );
}
setRGB( dst, 0, 0, width, height, inPixels );
return dst;
}
public static void blur( int[] in, int[] out, int width, int height, int radius ) {
int widthMinus1 = width-1;
int tableSize = 2*radius+1;
int divide[] = new int[256*tableSize];
for ( int i = 0; i < 256*tableSize; i++ )
divide[i] = i/tableSize;
int inIndex = 0;
for ( int y = 0; y < height; y++ ) {
int outIndex = y;
int ta = 0, tr = 0, tg = 0, tb = 0;
for ( int i = -radius; i <= radius; i++ ) {
int rgb = in[inIndex + ImageMath.clamp(i, 0, width-1)];
ta += (rgb >> 24) & 0xff;
tr += (rgb >> 16) & 0xff;
tg += (rgb >> 8) & 0xff;
tb += rgb & 0xff;
}
for ( int x = 0; x < width; x++ ) {
out[ outIndex ] = (divide[ta] << 24) | (divide[tr] << 16) | (divide[tg] << 8) | divide[tb];
int i1 = x+radius+1;
if ( i1 > widthMinus1 )
i1 = widthMinus1;
int i2 = x-radius;
if ( i2 < 0 )
i2 = 0;
int rgb1 = in[inIndex+i1];
int rgb2 = in[inIndex+i2];
ta += ((rgb1 >> 24) & 0xff)-((rgb2 >> 24) & 0xff);
tr += ((rgb1 & 0xff0000)-(rgb2 & 0xff0000)) >> 16;
tg += ((rgb1 & 0xff00)-(rgb2 & 0xff00)) >> 8;
tb += (rgb1 & 0xff)-(rgb2 & 0xff);
outIndex += height;
}
inIndex += width;
}
}
public void setHRadius(int hRadius) {
this.hRadius = hRadius;
}
public int getHRadius() {
return hRadius;
}
public void setVRadius(int vRadius) {
this.vRadius = vRadius;
}
public int getVRadius() {
return vRadius;
}
public void setRadius(int radius) {
this.hRadius = this.vRadius = radius;
}
public int getRadius() {
return hRadius;
}
public void setIterations(int iterations) {
this.iterations = iterations;
}
public int getIterations() {
return iterations;
}
public String toString() {
return "Blur/Box Blur...";
}
}
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