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 to posterize an image. 049 */ 050public class PosterizeFilter extends PointFilter implements DynFiltering { 051 052 private int numLevels; 053 private int[] levels; 054 private boolean initialized = false; 055 056 public PosterizeFilter() { 057 setNumLevels(6); 058 } 059 060 /** 061 * Set the number of levels in the output image. 062 * @param numLevels the number of levels 063 * @see #getNumLevels 064 */ 065 public void setNumLevels(int numLevels) { 066 this.numLevels = numLevels; 067 initialized = false; 068 } 069 070 /** 071 * Get the number of levels in the output image. 072 * @return the number of levels 073 * @see #setNumLevels 074 */ 075 public int getNumLevels() { 076 return numLevels; 077 } 078 079 /** 080 * Initialize the filter. 081 */ 082 protected void initialize() { 083 levels = new int[256]; 084 if (numLevels != 1) 085 for (int i = 0; i < 256; i++) 086 levels[i] = 255 * (numLevels*i / 256) / (numLevels-1); 087 } 088 089 public int filterRGB(int x, int y, int rgb) { 090 if (!initialized) { 091 initialized = true; 092 initialize(); 093 } 094 int a = rgb & 0xff000000; 095 int r = (rgb >> 16) & 0xff; 096 int g = (rgb >> 8) & 0xff; 097 int b = rgb & 0xff; 098 r = levels[r]; 099 g = levels[g]; 100 b = levels[b]; 101 return a | (r << 16) | (g << 8) | b; 102 } 103 104 public String toString() { 105 return "Colors/Posterize..."; 106 } 107 108 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 109 Object o; 110 if((o=parameters.removeEL(KeyImpl.init("NumLevels")))!=null)setNumLevels(ImageFilterUtil.toIntValue(o,"NumLevels")); 111 if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){ 112 int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions"); 113 setDimensions(dim[0],dim[1]); 114 } 115 116 // check for arguments not supported 117 if(parameters.size()>0) { 118 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 [NumLevels, Dimensions]"); 119 } 120 121 return filter(src, dst); 122 } 123} 124