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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.*;
public class SmartBlurFilter extends AbstractBufferedImageOp {
private int hRadius = 5;
private int vRadius = 5;
private int threshold = 10;
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 );
Kernel kernel = GaussianFilter.makeKernel(hRadius);
thresholdBlur( kernel, inPixels, outPixels, width, height, true );
thresholdBlur( kernel, outPixels, inPixels, height, width, true );
setRGB( dst, 0, 0, width, height, inPixels );
return dst;
}
/**
* Convolve with a kernel consisting of one row
*/
public void thresholdBlur(Kernel kernel, int[] inPixels, int[] outPixels, int width, int height, boolean alpha) {
int index = 0;
float[] matrix = kernel.getKernelData( null );
int cols = kernel.getWidth();
int cols2 = cols/2;
for (int y = 0; y < height; y++) {
int ioffset = y*width;
int outIndex = y;
for (int x = 0; x < width; x++) {
float r = 0, g = 0, b = 0, a = 0;
int moffset = cols2;
int rgb1 = inPixels[ioffset+x];
int a1 = (rgb1 >> 24) & 0xff;
int r1 = (rgb1 >> 16) & 0xff;
int g1 = (rgb1 >> 8) & 0xff;
int b1 = rgb1 & 0xff;
float af = 0, rf = 0, gf = 0, bf = 0;
for (int col = -cols2; col <= cols2; col++) {
float f = matrix[moffset+col];
if (f != 0) {
int ix = x+col;
if (!(0 <= ix && ix < width))
ix = x;
int rgb2 = inPixels[ioffset+ix];
int a2 = (rgb2 >> 24) & 0xff;
int r2 = (rgb2 >> 16) & 0xff;
int g2 = (rgb2 >> 8) & 0xff;
int b2 = rgb2 & 0xff;
int d;
d = a1-a2;
if ( d >= -threshold && d <= threshold ) {
a += f * a2;
af += f;
}
d = r1-r2;
if ( d >= -threshold && d <= threshold ) {
r += f * r2;
rf += f;
}
d = g1-g2;
if ( d >= -threshold && d <= threshold ) {
g += f * g2;
gf += f;
}
d = b1-b2;
if ( d >= -threshold && d <= threshold ) {
b += f * b2;
bf += f;
}
}
}
a = af == 0 ? a1 : a/af;
r = rf == 0 ? r1 : r/rf;
g = gf == 0 ? g1 : g/gf;
b = bf == 0 ? b1 : b/bf;
int ia = alpha ? PixelUtils.clamp((int)(a+0.5)) : 0xff;
int ir = PixelUtils.clamp((int)(r+0.5));
int ig = PixelUtils.clamp((int)(g+0.5));
int ib = PixelUtils.clamp((int)(b+0.5));
outPixels[outIndex] = (ia << 24) | (ir << 16) | (ig << 8) | ib;
outIndex += height;
}
}
}
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 setThreshold(int threshold) {
this.threshold = threshold;
}
public int getThreshold() {
return threshold;
}
public String toString() {
return "Blur/Smart Blur...";
}
}
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