001    /*
002    *
003    
004    Licensed under the Apache License, Version 2.0 (the "License");
005    you may not use this file except in compliance with the License.
006    You may obtain a copy of the License at
007    
008       http://www.apache.org/licenses/LICENSE-2.0
009    
010    Unless required by applicable law or agreed to in writing, software
011    distributed under the License is distributed on an "AS IS" BASIS,
012    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013    See the License for the specific language governing permissions and
014    limitations under the License.
015    */
016    
017    package railo.runtime.img.filter;import java.awt.image.BufferedImage;
018    
019    import railo.runtime.engine.ThreadLocalPageContext;
020    import railo.runtime.exp.FunctionException;
021    import railo.runtime.exp.PageException;
022    import railo.runtime.img.ImageUtil;
023    import railo.runtime.type.KeyImpl;
024    import railo.runtime.type.Struct;
025    import railo.runtime.type.util.CollectionUtil;
026    
027    public class OffsetFilter extends TransformFilter  implements DynFiltering {
028    
029            private int width, height;
030            private int xOffset, yOffset;
031            private boolean wrap;
032    
033            public OffsetFilter() {
034                    this(0, 0, true);
035            }
036    
037            public OffsetFilter(int xOffset, int yOffset, boolean wrap) {
038                    super(ConvolveFilter.ZERO_EDGES );
039                    this.xOffset = xOffset;
040                    this.yOffset = yOffset;
041                    this.wrap = wrap;
042            }
043    
044            public void setXOffset(int xOffset) {
045                    this.xOffset = xOffset;
046            }
047            
048            public int getXOffset() {
049                    return xOffset;
050            }
051            
052            public void setYOffset(int yOffset) {
053                    this.yOffset = yOffset;
054            }
055            
056            public int getYOffset() {
057                    return yOffset;
058            }
059            
060            public void setWrap(boolean wrap) {
061                    this.wrap = wrap;
062            }
063            
064            public boolean getWrap() {
065                    return wrap;
066            }
067            
068            protected void transformInverse(int x, int y, float[] out) {
069                    if ( wrap ) {
070                            out[0] = (x+width-xOffset) % width;
071                            out[1] = (y+height-yOffset) % height;
072                    } else {
073                            out[0] = x-xOffset;
074                            out[1] = y-yOffset;
075                    }
076            }
077    
078        public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
079                    this.width = src.getWidth();
080                    this.height = src.getHeight();
081                    if ( wrap ) {
082                            while (xOffset < 0)
083                                    xOffset += width;
084                            while (yOffset < 0)
085                                    yOffset += height;
086                            xOffset %= width;
087                            yOffset %= height;
088                    }
089                    return super.filter( src, dst );
090            }
091    
092            public String toString() {
093                    return "Distort/Offset...";
094            }
095            public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
096                    Object o;
097                    if((o=parameters.removeEL(KeyImpl.init("XOffset")))!=null)setXOffset(ImageFilterUtil.toIntValue(o,"XOffset"));
098                    if((o=parameters.removeEL(KeyImpl.init("YOffset")))!=null)setYOffset(ImageFilterUtil.toIntValue(o,"YOffset"));
099                    if((o=parameters.removeEL(KeyImpl.init("Wrap")))!=null)setWrap(ImageFilterUtil.toBooleanValue(o,"Wrap"));
100                    if((o=parameters.removeEL(KeyImpl.init("EdgeAction")))!=null)setEdgeAction(ImageFilterUtil.toString(o,"EdgeAction"));
101                    if((o=parameters.removeEL(KeyImpl.init("Interpolation")))!=null)setInterpolation(ImageFilterUtil.toString(o,"Interpolation"));
102    
103                    // check for arguments not supported
104                    if(parameters.size()>0) {
105                            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]");
106                    }
107    
108                    return filter(src, dst);
109            }
110    }