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 premultiplies an image's alpha. 
049 * Note: this does not change the image type of the BufferedImage
050 */
051public class PremultiplyFilter extends PointFilter  implements DynFiltering {
052
053        public PremultiplyFilter() {
054        }
055
056        public int filterRGB(int x, int y, int rgb) {
057                int a = (rgb >> 24) & 0xff;
058                int r = (rgb >> 16) & 0xff;
059                int g = (rgb >> 8) & 0xff;
060                int b = rgb & 0xff;
061                float f = a * (1.0f / 255.0f);
062                r *= f;
063                g *= f;
064                b *= f;
065                return (a << 24) | (r << 16) | (g << 8) | b;
066        }
067
068        public String toString() {
069                return "Alpha/Premultiply";
070        }
071        public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
072                Object o;
073                if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){
074                        int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions");
075                        setDimensions(dim[0],dim[1]);
076                }
077
078                // check for arguments not supported
079                if(parameters.size()>0) {
080                        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]");
081                }
082
083                return filter(src, dst);
084        }
085}
086