001/** 002 * 003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved. 004 * 005 * This library is free software; you can redistribute it and/or 006 * modify it under the terms of the GNU Lesser General Public 007 * License as published by the Free Software Foundation; either 008 * version 2.1 of the License, or (at your option) any later version. 009 * 010 * This library is distributed in the hope that it will be useful, 011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 013 * Lesser General Public License for more details. 014 * 015 * You should have received a copy of the GNU Lesser General Public 016 * License along with this library. If not, see <http://www.gnu.org/licenses/>. 017 * 018 **/ 019/* 020* 021 022Licensed under the Apache License, Version 2.0 (the "License"); 023you may not use this file except in compliance with the License. 024You may obtain a copy of the License at 025 026 http://www.apache.org/licenses/LICENSE-2.0 027 028Unless required by applicable law or agreed to in writing, software 029distributed under the License is distributed on an "AS IS" BASIS, 030WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 031See the License for the specific language governing permissions and 032limitations under the License. 033*/ 034 035package lucee.runtime.img.filter;import java.awt.Rectangle; 036import java.awt.image.BufferedImage; 037 038import lucee.runtime.engine.ThreadLocalPageContext; 039import lucee.runtime.exp.FunctionException; 040import lucee.runtime.exp.PageException; 041import lucee.runtime.img.ImageUtil; 042import lucee.runtime.type.KeyImpl; 043import lucee.runtime.type.Struct; 044import lucee.runtime.type.util.CollectionUtil; 045 046/** 047 * An edge-detection filter. 048 */ 049public class EdgeFilter extends WholeImageFilter implements DynFiltering { 050 051 public final static float R2 = (float)Math.sqrt(2); 052 053 public final static float[] ROBERTS_V = { 054 0, 0, -1, 055 0, 1, 0, 056 0, 0, 0, 057 }; 058 public final static float[] ROBERTS_H = { 059 -1, 0, 0, 060 0, 1, 0, 061 0, 0, 0, 062 }; 063 public final static float[] PREWITT_V = { 064 -1, 0, 1, 065 -1, 0, 1, 066 -1, 0, 1, 067 }; 068 public final static float[] PREWITT_H = { 069 -1, -1, -1, 070 0, 0, 0, 071 1, 1, 1, 072 }; 073 public final static float[] SOBEL_V = { 074 -1, 0, 1, 075 -2, 0, 2, 076 -1, 0, 1, 077 }; 078 public static float[] SOBEL_H = { 079 -1, -2, -1, 080 0, 0, 0, 081 1, 2, 1, 082 }; 083 public final static float[] FREI_CHEN_V = { 084 -1, 0, 1, 085 -R2, 0, R2, 086 -1, 0, 1, 087 }; 088 public static float[] FREI_CHEN_H = { 089 -1, -R2, -1, 090 0, 0, 0, 091 1, R2, 1, 092 }; 093 094 protected float[] vEdgeMatrix = SOBEL_V; 095 protected float[] hEdgeMatrix = SOBEL_H; 096 097 public EdgeFilter() { 098 } 099 100 public void setVEdgeMatrix(float[] vEdgeMatrix) { 101 this.vEdgeMatrix = vEdgeMatrix; 102 } 103 104 public float[] getVEdgeMatrix() { 105 return vEdgeMatrix; 106 } 107 108 public void setHEdgeMatrix(float[] hEdgeMatrix) { 109 this.hEdgeMatrix = hEdgeMatrix; 110 } 111 112 public float[] getHEdgeMatrix() { 113 return hEdgeMatrix; 114 } 115 116 protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) { 117 int index = 0; 118 int[] outPixels = new int[width * height]; 119 120 for (int y = 0; y < height; y++) { 121 for (int x = 0; x < width; x++) { 122 int r = 0, g = 0, b = 0; 123 int rh = 0, gh = 0, bh = 0; 124 int rv = 0, gv = 0, bv = 0; 125 int a = inPixels[y*width+x] & 0xff000000; 126 127 for (int row = -1; row <= 1; row++) { 128 int iy = y+row; 129 int ioffset; 130 if (0 <= iy && iy < height) 131 ioffset = iy*width; 132 else 133 ioffset = y*width; 134 int moffset = 3*(row+1)+1; 135 for (int col = -1; col <= 1; col++) { 136 int ix = x+col; 137 if (!(0 <= ix && ix < width)) 138 ix = x; 139 int rgb = inPixels[ioffset+ix]; 140 float h = hEdgeMatrix[moffset+col]; 141 float v = vEdgeMatrix[moffset+col]; 142 143 r = (rgb & 0xff0000) >> 16; 144 g = (rgb & 0x00ff00) >> 8; 145 b = rgb & 0x0000ff; 146 rh += (int)(h * r); 147 gh += (int)(h * g); 148 bh += (int)(h * b); 149 rv += (int)(v * r); 150 gv += (int)(v * g); 151 bv += (int)(v * b); 152 } 153 } 154 r = (int)(Math.sqrt(rh*rh + rv*rv) / 1.8); 155 g = (int)(Math.sqrt(gh*gh + gv*gv) / 1.8); 156 b = (int)(Math.sqrt(bh*bh + bv*bv) / 1.8); 157 r = PixelUtils.clamp(r); 158 g = PixelUtils.clamp(g); 159 b = PixelUtils.clamp(b); 160 outPixels[index++] = a | (r << 16) | (g << 8) | b; 161 } 162 163 } 164 return outPixels; 165 } 166 167 public String toString() { 168 return "Blur/Detect Edges"; 169 } 170 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 171 Object o; 172 if((o=parameters.removeEL(KeyImpl.init("VEdgeMatrix")))!=null)setVEdgeMatrix(ImageFilterUtil.toAFloat(o,"VEdgeMatrix")); 173 if((o=parameters.removeEL(KeyImpl.init("HEdgeMatrix")))!=null)setHEdgeMatrix(ImageFilterUtil.toAFloat(o,"HEdgeMatrix")); 174 175 // check for arguments not supported 176 if(parameters.size()>0) { 177 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]"); 178 } 179 180 return filter(src, dst); 181 } 182}