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.type.KeyImpl; 041import lucee.runtime.type.Struct; 042import lucee.runtime.type.util.CollectionUtil; 043 044/** 045 * This filter diffuses an image by moving its pixels in random directions. 046 */ 047public class DiffuseFilter extends TransformFilter implements DynFiltering { 048 049 private float[] sinTable, cosTable; 050 private float scale = 4; 051 052 public DiffuseFilter() { 053 super(ConvolveFilter.CLAMP_EDGES); 054 } 055 056 /** 057 * Specifies the scale of the texture. 058 * @param scale the scale of the texture. 059 * @min-value 1 060 * @max-value 100+ 061 * @see #getScale 062 */ 063 public void setScale(float scale) { 064 this.scale = scale; 065 } 066 067 /** 068 * Returns the scale of the texture. 069 * @return the scale of the texture. 070 * @see #setScale 071 */ 072 public float getScale() { 073 return scale; 074 } 075 076 protected void transformInverse(int x, int y, float[] out) { 077 int angle = (int)(Math.random() * 255); 078 float distance = (float)Math.random(); 079 out[0] = x + distance * sinTable[angle]; 080 out[1] = y + distance * cosTable[angle]; 081 } 082 083 public BufferedImage filter( BufferedImage src, BufferedImage dst ) { 084 sinTable = new float[256]; 085 cosTable = new float[256]; 086 for (int i = 0; i < 256; i++) { 087 float angle = ImageMath.TWO_PI*i/256f; 088 sinTable[i] = (float)(scale*Math.sin(angle)); 089 cosTable[i] = (float)(scale*Math.cos(angle)); 090 } 091 return super.filter( src, dst ); 092 } 093 094 public String toString() { 095 return "Distort/Diffuse..."; 096 } 097 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=null;//ImageUtil.createBufferedImage(src); 098 Object o; 099 if((o=parameters.removeEL(KeyImpl.init("Scale")))!=null)setScale(ImageFilterUtil.toFloatValue(o,"Scale")); 100 if((o=parameters.removeEL(KeyImpl.init("EdgeAction")))!=null)setEdgeAction(ImageFilterUtil.toString(o,"EdgeAction")); 101 if((o=parameters.removeEL(KeyImpl.init("Interpolation")))!=null)setInterpolation(ImageFilterUtil.toString(o,"Interpolation")); 102 103 // check for arguments not supported 104 if(parameters.size()>0) { 105 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, EdgeAction, Interpolation]"); 106 } 107 108 return filter(src, dst); 109 } 110}