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 045public abstract class TransferFilter extends PointFilter implements DynFiltering { 046 047 protected int[] rTable, gTable, bTable; 048 protected boolean initialized = false; 049 050 public TransferFilter() { 051 canFilterIndexColorModel = true; 052 } 053 054 public int filterRGB(int x, int y, int rgb) { 055 int a = rgb & 0xff000000; 056 int r = (rgb >> 16) & 0xff; 057 int g = (rgb >> 8) & 0xff; 058 int b = rgb & 0xff; 059 r = rTable[r]; 060 g = gTable[g]; 061 b = bTable[b]; 062 return a | (r << 16) | (g << 8) | b; 063 } 064 065 public BufferedImage filter( BufferedImage src, BufferedImage dst ) { 066 if (!initialized) 067 initialize(); 068 return super.filter( src, dst ); 069 } 070 071 protected void initialize() { 072 initialized = true; 073 rTable = gTable = bTable = makeTable(); 074 } 075 076 protected int[] makeTable() { 077 int[] table = new int[256]; 078 for (int i = 0; i < 256; i++) 079 table[i] = PixelUtils.clamp( (int)( 255 * transferFunction( i / 255.0f ) ) ); 080 return table; 081 } 082 083 protected float transferFunction( float v ) { 084 return 0; 085 } 086 087 public int[] getLUT() { 088 if (!initialized) 089 initialize(); 090 int[] lut = new int[256]; 091 for ( int i = 0; i < 256; i++ ) { 092 lut[i] = filterRGB( 0, 0, (i << 24) | (i << 16) | (i << 8) | i ); 093 } 094 return lut; 095 } 096 097 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 098 Object o; 099 if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){ 100 int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions"); 101 setDimensions(dim[0],dim[1]); 102 } 103 104 // check for arguments not supported 105 if(parameters.size()>0) { 106 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 [Dimensions]"); 107 } 108 109 return filter(src, dst); 110 } 111} 112