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    /**
028     * A filter which interpolates between two images. You can set the interpolation factor outside the range 0 to 1
029     * to extrapolate images.
030     */
031    public class InterpolateFilter extends AbstractBufferedImageOp  implements DynFiltering {
032            
033            private BufferedImage destination;
034            private float interpolation;
035    
036            public InterpolateFilter() {
037            }
038    
039        /**
040         * Set the destination image.
041         * @param destination the destination image
042         * @see #getDestination
043         */
044            public void setDestination( BufferedImage destination ) {
045                    this.destination = destination;
046            }
047            
048        /**
049         * Get the destination image.
050         * @return the destination image
051         * @see #setDestination
052         */
053            public BufferedImage getDestination() {
054                    return destination;
055            }
056            
057        /**
058         * Set the interpolation factor.
059         * @param interpolation the interpolation factor
060         * @see #getInterpolation
061         */
062            public void setInterpolation( float interpolation ) {
063                    this.interpolation = interpolation;
064            }
065            
066        /**
067         * Get the interpolation factor.
068         * @return the interpolation factor
069         * @see #setInterpolation
070         */
071            public float getInterpolation() {
072                    return interpolation;
073            }
074            
075        public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
076            int width = src.getWidth();
077            int height = src.getHeight();
078                    src.getType();
079                    src.getRaster();
080    
081            if ( dst == null )
082                dst = createCompatibleDestImage( src, null );
083                    dst.getRaster();
084    
085            if ( destination != null ) {
086                            width = Math.min( width, destination.getWidth() );
087                            height = Math.min( height, destination.getWidth() );
088                            int[] pixels1 = null;
089                            int[] pixels2 = null;
090    
091                            for (int y = 0; y < height; y++) {
092                                    pixels1 = getRGB( src, 0, y, width, 1, pixels1 );
093                                    pixels2 = getRGB( destination, 0, y, width, 1, pixels2 );
094                                    for (int x = 0; x < width; x++) {
095                                            int rgb1 = pixels1[x];
096                                            int rgb2 = pixels2[x];
097                                            int a1 = (rgb1 >> 24) & 0xff;
098                                            int r1 = (rgb1 >> 16) & 0xff;
099                                            int g1 = (rgb1 >> 8) & 0xff;
100                                            int b1 = rgb1 & 0xff;
101                                            //int a2 = (rgb2 >> 24) & 0xff;
102                                            int r2 = (rgb2 >> 16) & 0xff;
103                                            int g2 = (rgb2 >> 8) & 0xff;
104                                            int b2 = rgb2 & 0xff;
105                                            r1 = PixelUtils.clamp( ImageMath.lerp( interpolation, r1, r2 ) );
106                                            g1 = PixelUtils.clamp( ImageMath.lerp( interpolation, g1, g2 ) );
107                                            b1 = PixelUtils.clamp( ImageMath.lerp( interpolation, b1, b2 ) );
108                                            pixels1[x] = (a1 << 24) | (r1 << 16) | (g1 << 8) | b1;
109                                    }
110                                    setRGB( dst, 0, y, width, 1, pixels1 );
111                            }
112            }
113    
114            return dst;
115        }
116    
117            public String toString() {
118                    return "Effects/Interpolate...";
119            }
120            public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
121                    Object o;
122                    if((o=parameters.removeEL(KeyImpl.init("Interpolation")))!=null)setInterpolation(ImageFilterUtil.toFloatValue(o,"Interpolation"));
123                    if((o=parameters.removeEL(KeyImpl.init("destination")))!=null)setDestination(ImageFilterUtil.toBufferedImage(o,"destination"));
124    
125                    // check for arguments not supported
126                    if(parameters.size()>0) {
127                            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 [Interpolation]");
128                    }
129    
130                    return filter(src, dst);
131            }
132    }