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 changes the exposure of an image. 049 */ 050public class ExposureFilter extends TransferFilter implements DynFiltering { 051 052 private float exposure = 1.0f; 053 054 protected float transferFunction( float f ) { 055 return 1 - (float)Math.exp(-f * exposure); 056 } 057 058 /** 059 * Set the exposure level. 060 * @param exposure the exposure level 061 * @min-value 0 062 * @max-value 5+ 063 * @see #getExposure 064 */ 065 public void setExposure(float exposure) { 066 this.exposure = exposure; 067 initialized = false; 068 } 069 070 /** 071 * Get the exposure level. 072 * @return the exposure level 073 * @see #setExposure 074 */ 075 public float getExposure() { 076 return exposure; 077 } 078 079 public String toString() { 080 return "Colors/Exposure..."; 081 } 082 083 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 084 Object o; 085 if((o=parameters.removeEL(KeyImpl.init("Exposure")))!=null)setExposure(ImageFilterUtil.toFloatValue(o,"Exposure")); 086 if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){ 087 int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions"); 088 setDimensions(dim[0],dim[1]); 089 } 090 091 // check for arguments not supported 092 if(parameters.size()>0) { 093 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 [Exposure, Dimensions]"); 094 } 095 096 return filter(src, dst); 097 } 098} 099