/**
*
* Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
**/
/*
*
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 lucee.runtime.img.filter;import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import lucee.runtime.engine.ThreadLocalPageContext;
import lucee.runtime.exp.FunctionException;
import lucee.runtime.exp.PageException;
import lucee.runtime.img.ImageUtil;
import lucee.runtime.type.KeyImpl;
import lucee.runtime.type.Struct;
import lucee.runtime.type.util.CollectionUtil;
/**
* An edge-detection filter.
*/
public class EdgeFilter extends WholeImageFilter implements DynFiltering {
public final static float R2 = (float)Math.sqrt(2);
public final static float[] ROBERTS_V = {
0, 0, -1,
0, 1, 0,
0, 0, 0,
};
public final static float[] ROBERTS_H = {
-1, 0, 0,
0, 1, 0,
0, 0, 0,
};
public final static float[] PREWITT_V = {
-1, 0, 1,
-1, 0, 1,
-1, 0, 1,
};
public final static float[] PREWITT_H = {
-1, -1, -1,
0, 0, 0,
1, 1, 1,
};
public final static float[] SOBEL_V = {
-1, 0, 1,
-2, 0, 2,
-1, 0, 1,
};
public static float[] SOBEL_H = {
-1, -2, -1,
0, 0, 0,
1, 2, 1,
};
public final static float[] FREI_CHEN_V = {
-1, 0, 1,
-R2, 0, R2,
-1, 0, 1,
};
public static float[] FREI_CHEN_H = {
-1, -R2, -1,
0, 0, 0,
1, R2, 1,
};
protected float[] vEdgeMatrix = SOBEL_V;
protected float[] hEdgeMatrix = SOBEL_H;
public EdgeFilter() {
}
public void setVEdgeMatrix(float[] vEdgeMatrix) {
this.vEdgeMatrix = vEdgeMatrix;
}
public float[] getVEdgeMatrix() {
return vEdgeMatrix;
}
public void setHEdgeMatrix(float[] hEdgeMatrix) {
this.hEdgeMatrix = hEdgeMatrix;
}
public float[] getHEdgeMatrix() {
return hEdgeMatrix;
}
@Override
protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) {
int index = 0;
int[] outPixels = new int[width * height];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
int r = 0, g = 0, b = 0;
int rh = 0, gh = 0, bh = 0;
int rv = 0, gv = 0, bv = 0;
int a = inPixels[y*width+x] & 0xff000000;
for (int row = -1; row <= 1; row++) {
int iy = y+row;
int ioffset;
if (0 <= iy && iy < height)
ioffset = iy*width;
else
ioffset = y*width;
int moffset = 3*(row+1)+1;
for (int col = -1; col <= 1; col++) {
int ix = x+col;
if (!(0 <= ix && ix < width))
ix = x;
int rgb = inPixels[ioffset+ix];
float h = hEdgeMatrix[moffset+col];
float v = vEdgeMatrix[moffset+col];
r = (rgb & 0xff0000) >> 16;
g = (rgb & 0x00ff00) >> 8;
b = rgb & 0x0000ff;
rh += (int)(h * r);
gh += (int)(h * g);
bh += (int)(h * b);
rv += (int)(v * r);
gv += (int)(v * g);
bv += (int)(v * b);
}
}
r = (int)(Math.sqrt(rh*rh + rv*rv) / 1.8);
g = (int)(Math.sqrt(gh*gh + gv*gv) / 1.8);
b = (int)(Math.sqrt(bh*bh + bv*bv) / 1.8);
r = PixelUtils.clamp(r);
g = PixelUtils.clamp(g);
b = PixelUtils.clamp(b);
outPixels[index++] = a | (r << 16) | (g << 8) | b;
}
}
return outPixels;
}
@Override
public String toString() {
return "Blur/Detect Edges";
}
@Override
public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
Object o;
if((o=parameters.removeEL(KeyImpl.init("VEdgeMatrix")))!=null)setVEdgeMatrix(ImageFilterUtil.toAFloat(o,"VEdgeMatrix"));
if((o=parameters.removeEL(KeyImpl.init("HEdgeMatrix")))!=null)setHEdgeMatrix(ImageFilterUtil.toAFloat(o,"HEdgeMatrix"));
// check for arguments not supported
if(parameters.size()>0) {
throw new FunctionException(ThreadLocalPageContext.get(), "ImageFilter", 3, "parameters", "the parameter"+(parameters.size()>1?"s":"")+" ["+CollectionUtil.getKeyList(parameters,", ")+"] "+(parameters.size()>1?"are":"is")+" not allowed, only the following parameters are supported [VEdgeMatrix, HEdgeMatrix]");
}
return filter(src, dst);
}
}