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.Rectangle;
018    import java.awt.image.BufferedImage;
019    import java.awt.image.ColorModel;
020    
021    import railo.runtime.engine.ThreadLocalPageContext;
022    import railo.runtime.exp.FunctionException;
023    import railo.runtime.exp.PageException;
024    import railo.runtime.img.ImageUtil;
025    import railo.runtime.type.Struct;
026    import railo.runtime.type.util.CollectionUtil;
027    
028    
029    /**
030     * A filter which acts as a superclass for filters which need to have the whole image in memory
031     * to do their stuff.
032     */
033    public abstract class WholeImageFilter extends AbstractBufferedImageOp  implements DynFiltering {
034    
035            /**
036         * The output image bounds.
037         */
038        protected Rectangle transformedSpace;
039    
040            /**
041         * The input image bounds.
042         */
043            protected Rectangle originalSpace;
044            
045            /**
046             * Construct a WholeImageFilter.
047             */
048            public WholeImageFilter() {
049            }
050    
051        public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
052            int width = src.getWidth();
053            int height = src.getHeight();
054                    //int type = src.getType();
055                    //WritableRaster srcRaster = 
056                    src.getRaster();
057    
058                    originalSpace = new Rectangle(0, 0, width, height);
059                    transformedSpace = new Rectangle(0, 0, width, height);
060                    transformSpace(transformedSpace);
061    
062            if ( dst == null ) {
063                ColorModel dstCM = src.getColorModel();
064                            dst = new BufferedImage(dstCM, dstCM.createCompatibleWritableRaster(transformedSpace.width, transformedSpace.height), dstCM.isAlphaPremultiplied(), null);
065                    }
066                    //WritableRaster dstRaster = 
067            dst.getRaster();
068    
069                    int[] inPixels = getRGB( src, 0, 0, width, height, null );
070                    inPixels = filterPixels( width, height, inPixels, transformedSpace );
071                    setRGB( dst, 0, 0, transformedSpace.width, transformedSpace.height, inPixels );
072    
073            return dst;
074        }
075    
076            /**
077         * Calculate output bounds for given input bounds.
078         * @param rect input and output rectangle
079         */
080            protected void transformSpace(Rectangle rect) {
081            }
082            
083            /**
084         * Actually filter the pixels.
085         * @param width the image width
086         * @param height the image height
087         * @param inPixels the image pixels
088         * @param transformedSpace the output bounds
089         * @return the output pixels
090         */
091            protected abstract int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace );
092            public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
093                    //Object o;
094    
095                    // check for arguments not supported
096                    if(parameters.size()>0) {
097                            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 []");
098                    }
099    
100                    return filter(src, dst);
101            }
102    }
103