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.image.BufferedImage; 036 037import lucee.runtime.engine.ThreadLocalPageContext; 038import lucee.runtime.exp.FunctionException; 039import lucee.runtime.exp.PageException; 040import lucee.runtime.img.ImageUtil; 041import lucee.runtime.type.KeyImpl; 042import lucee.runtime.type.Struct; 043import lucee.runtime.type.util.CollectionUtil; 044 045 046 047/** 048 * A filter which uses the brightness of each pixel to lookup a color from a colormap. 049 */ 050public class LookupFilter extends PointFilter implements DynFiltering { 051 052 private Colormap colormap = new Gradient(); 053 054 /** 055 * Construct a LookupFilter. 056 */ 057 public LookupFilter() { 058 canFilterIndexColorModel = true; 059 } 060 061 /** 062 * Construct a LookupFilter. 063 * @param colormap the color map 064 */ 065 public LookupFilter(Colormap colormap) { 066 canFilterIndexColorModel = true; 067 this.colormap = colormap; 068 } 069 070 /** 071 * Set the colormap to be used for the filter. 072 * @param colormap the colormap 073 * @see #getColormap 074 */ 075 public void setColormap(Colormap colormap) { 076 this.colormap = colormap; 077 } 078 079 /** 080 * Get the colormap to be used for the filter. 081 * @return the colormap 082 * @see #setColormap 083 */ 084 public Colormap getColormap() { 085 return colormap; 086 } 087 088 public int filterRGB(int x, int y, int rgb) { 089// int a = rgb & 0xff000000; 090 int r = (rgb >> 16) & 0xff; 091 int g = (rgb >> 8) & 0xff; 092 int b = rgb & 0xff; 093 rgb = (r + g + b) / 3; 094 return colormap.getColor(rgb/255.0f); 095 } 096 097 public String toString() { 098 return "Colors/Lookup..."; 099 } 100 101 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 102 Object o; 103 if((o=parameters.removeEL(KeyImpl.init("Colormap")))!=null)setColormap(ImageFilterUtil.toColormap(o,"Colormap")); 104 if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){ 105 int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions"); 106 setDimensions(dim[0],dim[1]); 107 } 108 109 // check for arguments not supported 110 if(parameters.size()>0) { 111 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 [Colormap, Dimensions]"); 112 } 113 114 return filter(src, dst); 115 } 116} 117 118