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 simply multiplies pixel values by a given scale factor. 049 */ 050public class RescaleFilter extends TransferFilter implements DynFiltering { 051 052 private float scale = 1.0f; 053 054 public RescaleFilter() { 055 } 056 057 public RescaleFilter(float scale) { 058 this.scale = scale; 059 } 060 061 protected float transferFunction( float v ) { 062 return v * scale; 063 } 064 065 /** 066 * Specifies the scale factor. 067 * @param scale the scale factor. 068 * @min-value 1 069 * @max-value 5+ 070 * @see #getScale 071 */ 072 public void setScale(float scale) { 073 this.scale = scale; 074 initialized = false; 075 } 076 077 /** 078 * Returns the scale factor. 079 * @return the scale factor. 080 * @see #setScale 081 */ 082 public float getScale() { 083 return scale; 084 } 085 086 public String toString() { 087 return "Colors/Rescale..."; 088 } 089 090 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 091 Object o; 092 if((o=parameters.removeEL(KeyImpl.init("Scale")))!=null)setScale(ImageFilterUtil.toFloatValue(o,"Scale")); 093 if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){ 094 int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions"); 095 setDimensions(dim[0],dim[1]); 096 } 097 098 // check for arguments not supported 099 if(parameters.size()>0) { 100 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 [Scale, Dimensions]"); 101 } 102 103 return filter(src, dst); 104 } 105} 106