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 for changing the gamma of an image. 049 */ 050public class GammaFilter extends TransferFilter implements DynFiltering { 051 052 private float rGamma, gGamma, bGamma; 053 054 /** 055 * Construct a GammaFilter. 056 */ 057 public GammaFilter() { 058 this(1.0f); 059 } 060 061 /** 062 * Construct a GammaFilter. 063 * @param gamma the gamma level for all RGB channels 064 */ 065 public GammaFilter(float gamma) { 066 this(gamma, gamma, gamma); 067 } 068 069 /** 070 * Construct a GammaFilter. 071 * @param rGamma the gamma level for the red channel 072 * @param gGamma the gamma level for the blue channel 073 * @param bGamma the gamma level for the green channel 074 */ 075 public GammaFilter(float rGamma, float gGamma, float bGamma) { 076 setGamma(rGamma, gGamma, bGamma); 077 } 078 079 /** 080 * Set the gamma levels. 081 * @param rGamma the gamma level for the red channel 082 * @param gGamma the gamma level for the blue channel 083 * @param bGamma the gamma level for the green channel 084 * @see #getGamma 085 */ 086 public void setGamma(float rGamma, float gGamma, float bGamma) { 087 this.rGamma = rGamma; 088 this.gGamma = gGamma; 089 this.bGamma = bGamma; 090 initialized = false; 091 } 092 093 /** 094 * Set the gamma level. 095 * @param gamma the gamma level for all RGB channels 096 * @see #getGamma 097 */ 098 public void setGamma(float gamma) { 099 setGamma(gamma, gamma, gamma); 100 } 101 102 /** 103 * Get the gamma level. 104 * @return the gamma level for all RGB channels 105 * @see #setGamma 106 */ 107 public float getGamma() { 108 return rGamma; 109 } 110 111 protected void initialize() { 112 rTable = makeTable(rGamma); 113 114 if (gGamma == rGamma) 115 gTable = rTable; 116 else 117 gTable = makeTable(gGamma); 118 119 if (bGamma == rGamma) 120 bTable = rTable; 121 else if (bGamma == gGamma) 122 bTable = gTable; 123 else 124 bTable = makeTable(bGamma); 125 } 126 127 private int[] makeTable(float gamma) { 128 int[] table = new int[256]; 129 for (int i = 0; i < 256; i++) { 130 int v = (int) ((255.0 * Math.pow(i/255.0, 1.0 / gamma)) + 0.5); 131 if (v > 255) 132 v = 255; 133 table[i] = v; 134 } 135 return table; 136 } 137 138 public String toString() { 139 return "Colors/Gamma..."; 140 } 141 142 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 143 Object o; 144 if((o=parameters.removeEL(KeyImpl.init("Gamma")))!=null)setGamma(ImageFilterUtil.toFloatValue(o,"Gamma")); 145 if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){ 146 int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions"); 147 setDimensions(dim[0],dim[1]); 148 } 149 150 // check for arguments not supported 151 if(parameters.size()>0) { 152 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 [Gamma, Gamma, Dimensions]"); 153 } 154 155 return filter(src, dst); 156 } 157} 158