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.Graphics2D;
036import java.awt.Image;
037import java.awt.image.BufferedImage;
038import java.awt.image.ColorModel;
039
040import lucee.runtime.exp.PageException;
041import lucee.runtime.img.ImageUtil;
042import lucee.runtime.op.Caster;
043import lucee.runtime.type.KeyImpl;
044import lucee.runtime.type.Struct;
045
046
047/**
048 * Scales an image using the area-averaging algorithm, which can't be done with AffineTransformOp.
049 */
050public class ScaleFilter extends AbstractBufferedImageOp  implements DynFiltering {
051
052        private int width;
053        private int height;
054
055    /**
056     * Construct a ScaleFilter.
057     */
058        public ScaleFilter() {
059                this(32, 32);
060        }
061
062    /**
063         * @param width the width to set
064         */
065        public void setWidth(int width) {
066                this.width = width;
067        }
068
069        /**
070         * @param height the height to set
071         */
072        public void setHeight(int height) {
073                this.height = height;
074        }
075
076        /**
077     * Construct a ScaleFilter.
078     * @param width the width to scale to
079     * @param height the height to scale to
080     */
081        public ScaleFilter( int width, int height ) {
082                this.width = width;
083                this.height = height;
084        }
085
086    public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
087        int w = src.getWidth();
088        int h = src.getHeight();
089
090                if ( dst == null ) {
091                        ColorModel dstCM = src.getColorModel();
092                        dst = new BufferedImage(dstCM, dstCM.createCompatibleWritableRaster(w, h), dstCM.isAlphaPremultiplied(), null);
093                }
094
095                //Image scaleImage = 
096                src.getScaledInstance( w, h, Image.SCALE_AREA_AVERAGING );
097                Graphics2D g = dst.createGraphics();
098                g.drawImage( src, 0, 0, width, height, null );
099                g.dispose();
100
101        return dst;
102    }
103
104        public String toString() {
105                return "Distort/Scale";
106        }
107
108        public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
109                int width=Caster.toIntValue(parameters.get(KeyImpl.init("Width")));
110                int height=Caster.toIntValue(parameters.get(KeyImpl.init("Height")));
111                setHeight(height);
112                setWidth(width);
113                
114                dst=ImageUtil.createBufferedImage(dst,width,height);
115                
116                
117                return filter(src, dst);
118        }
119}