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