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 adds Gaussian blur to an image, producing a glowing effect.
029     *
030     */
031    public class GlowFilter extends GaussianFilter  implements DynFiltering {
032    
033            private float amount = 0.5f;
034            
035            public GlowFilter() {
036                    radius = 2;
037            }
038            
039            /**
040             * Set the amount of glow.
041             * @param amount the amount
042         * @min-value 0
043         * @max-value 1
044         * @see #getAmount
045             */
046            public void setAmount( float amount ) {
047                    this.amount = amount;
048            }
049            
050            /**
051             * Get the amount of glow.
052             * @return the amount
053         * @see #setAmount
054             */
055            public float getAmount() {
056                    return amount;
057            }
058            
059        public BufferedImage filter( BufferedImage src, BufferedImage dst ) {
060            int width = src.getWidth();
061            int height = src.getHeight();
062    
063            if ( dst == null )
064                dst = createCompatibleDestImage( src, null );
065    
066            int[] inPixels = new int[width*height];
067            int[] outPixels = new int[width*height];
068            src.getRGB( 0, 0, width, height, inPixels, 0, width );
069    
070                    if ( radius > 0 ) {
071                            convolveAndTranspose(kernel, inPixels, outPixels, width, height, alpha, alpha && premultiplyAlpha, false, CLAMP_EDGES);
072                            convolveAndTranspose(kernel, outPixels, inPixels, height, width, alpha, false, alpha && premultiplyAlpha, CLAMP_EDGES);
073                    }
074    
075            src.getRGB( 0, 0, width, height, outPixels, 0, width );
076    
077                    float a = 4*amount;
078    
079                    int index = 0;
080                    for ( int y = 0; y < height; y++ ) {
081                            for ( int x = 0; x < width; x++ ) {
082                                    int rgb1 = outPixels[index];
083                                    int r1 = (rgb1 >> 16) & 0xff;
084                                    int g1 = (rgb1 >> 8) & 0xff;
085                                    int b1 = rgb1 & 0xff;
086    
087                                    int rgb2 = inPixels[index];
088                                    int r2 = (rgb2 >> 16) & 0xff;
089                                    int g2 = (rgb2 >> 8) & 0xff;
090                                    int b2 = rgb2 & 0xff;
091    
092                                    r1 = PixelUtils.clamp( (int)(r1 + a * r2) );
093                                    g1 = PixelUtils.clamp( (int)(g1 + a * g2) );
094                                    b1 = PixelUtils.clamp( (int)(b1 + a * b2) );
095    
096                                    inPixels[index] = (rgb1 & 0xff000000) | (r1 << 16) | (g1 << 8) | b1;
097                                    index++;
098                            }
099                    }
100    
101            dst.setRGB( 0, 0, width, height, inPixels, 0, width );
102            return dst;
103        }
104    
105            public String toString() {
106                    return "Blur/Glow...";
107            }
108            public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
109                    Object o;
110                    if((o=parameters.removeEL(KeyImpl.init("Amount")))!=null)setAmount(ImageFilterUtil.toFloatValue(o,"Amount"));
111                    if((o=parameters.removeEL(KeyImpl.init("Radius")))!=null)setRadius(ImageFilterUtil.toFloatValue(o,"Radius"));
112                    if((o=parameters.removeEL(KeyImpl.init("EdgeAction")))!=null)setEdgeAction(ImageFilterUtil.toString(o,"EdgeAction"));
113                    if((o=parameters.removeEL(KeyImpl.init("UseAlpha")))!=null)setUseAlpha(ImageFilterUtil.toBooleanValue(o,"UseAlpha"));
114                    if((o=parameters.removeEL(KeyImpl.init("PremultiplyAlpha")))!=null)setPremultiplyAlpha(ImageFilterUtil.toBooleanValue(o,"PremultiplyAlpha"));
115    
116                    // check for arguments not supported
117                    if(parameters.size()>0) {
118                            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 [Amount, Radius, Kernel, EdgeAction, UseAlpha, PremultiplyAlpha]");
119                    }
120    
121                    return filter(src, dst);
122            }
123    }