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 class OffsetFilter extends TransformFilter  implements DynFiltering {
046
047        private int width, height;
048        private int xOffset, yOffset;
049        private boolean wrap;
050
051        public OffsetFilter() {
052                this(0, 0, true);
053        }
054
055        public OffsetFilter(int xOffset, int yOffset, boolean wrap) {
056                super(ConvolveFilter.ZERO_EDGES );
057                this.xOffset = xOffset;
058                this.yOffset = yOffset;
059                this.wrap = wrap;
060        }
061
062        public void setXOffset(int xOffset) {
063                this.xOffset = xOffset;
064        }
065        
066        public int getXOffset() {
067                return xOffset;
068        }
069        
070        public void setYOffset(int yOffset) {
071                this.yOffset = yOffset;
072        }
073        
074        public int getYOffset() {
075                return yOffset;
076        }
077        
078        public void setWrap(boolean wrap) {
079                this.wrap = wrap;
080        }
081        
082        public boolean getWrap() {
083                return wrap;
084        }
085        
086        protected void transformInverse(int x, int y, float[] out) {
087                if ( wrap ) {
088                        out[0] = (x+width-xOffset) % width;
089                        out[1] = (y+height-yOffset) % height;
090                } else {
091                        out[0] = x-xOffset;
092                        out[1] = y-yOffset;
093                }
094        }
095
096    public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
097                this.width = src.getWidth();
098                this.height = src.getHeight();
099                if ( wrap ) {
100                        while (xOffset < 0)
101                                xOffset += width;
102                        while (yOffset < 0)
103                                yOffset += height;
104                        xOffset %= width;
105                        yOffset %= height;
106                }
107                return super.filter( src, dst );
108        }
109
110        public String toString() {
111                return "Distort/Offset...";
112        }
113        public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
114                Object o;
115                if((o=parameters.removeEL(KeyImpl.init("XOffset")))!=null)setXOffset(ImageFilterUtil.toIntValue(o,"XOffset"));
116                if((o=parameters.removeEL(KeyImpl.init("YOffset")))!=null)setYOffset(ImageFilterUtil.toIntValue(o,"YOffset"));
117                if((o=parameters.removeEL(KeyImpl.init("Wrap")))!=null)setWrap(ImageFilterUtil.toBooleanValue(o,"Wrap"));
118                if((o=parameters.removeEL(KeyImpl.init("EdgeAction")))!=null)setEdgeAction(ImageFilterUtil.toString(o,"EdgeAction"));
119                if((o=parameters.removeEL(KeyImpl.init("Interpolation")))!=null)setInterpolation(ImageFilterUtil.toString(o,"Interpolation"));
120
121                // check for arguments not supported
122                if(parameters.size()>0) {
123                        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 [XOffset, YOffset, Wrap, EdgeAction, Interpolation]");
124                }
125
126                return filter(src, dst);
127        }
128}