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.RenderingHints;
037import java.awt.image.BufferedImage;
038import java.awt.image.ColorModel;
039
040import lucee.runtime.engine.ThreadLocalPageContext;
041import lucee.runtime.exp.FunctionException;
042import lucee.runtime.exp.PageException;
043import lucee.runtime.img.ImageUtil;
044import lucee.runtime.type.Struct;
045import lucee.runtime.type.util.CollectionUtil;
046
047/**
048 * Scales an image using bi-cubic interpolation, which can't be done with AffineTransformOp.
049 */
050public class BicubicScaleFilter extends AbstractBufferedImageOp  implements DynFiltering {
051
052        private int width;
053        private int height;
054
055        /**
056     * Construct a BicubicScaleFilter which resizes to 32x32 pixels.
057     */
058    public BicubicScaleFilter() {
059                this(32, 32);
060        }
061
062        /**
063         * Constructor for a filter which scales the input image to the given width and height using bicubic interpolation.
064         * Unfortunately, it appears that bicubic actually looks worse than bilinear interpolation on most Java implementations,
065         * but you can be the judge.
066     * @param width the width of the output image
067     * @param height the height of the output image
068         */
069        public BicubicScaleFilter( int width, int height ) {
070                this.width = width;
071                this.height = height;
072        }
073
074    public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
075        //int w = src.getWidth();
076        //int h = src.getHeight();
077
078                if ( dst == null ) {
079                        ColorModel dstCM = src.getColorModel();
080                        dst = new BufferedImage(dstCM, dstCM.createCompatibleWritableRaster(width, height), dstCM.isAlphaPremultiplied(), null);
081                }
082
083                Graphics2D g = dst.createGraphics();
084                g.setRenderingHint( RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC );
085                g.drawImage( src, 0, 0, width, height, null );
086                g.dispose();
087
088        return dst;
089    }
090
091        public String toString() {
092                return "Distort/Bicubic Scale";
093        }
094
095        public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
096                //Object o;
097
098                // check for arguments not supported
099                if(parameters.size()>0) {
100                        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 []");
101                }
102
103                return filter(src, dst);
104        }
105}