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.List;
025    import railo.runtime.type.Struct;
026    
027    
028    
029    /**
030     * A filter which draws a gradient interpolated between four colors defined at the corners of the image.
031     */
032    public class FourColorFilter extends PointFilter  implements DynFiltering {
033            
034            private int width;
035            private int height;
036            private int colorNW;
037            private int colorNE;
038            private int colorSW;
039            private int colorSE;
040            private int rNW, gNW, bNW;
041            private int rNE, gNE, bNE;
042            private int rSW, gSW, bSW;
043            private int rSE, gSE, bSE;
044    
045            public FourColorFilter() {
046                    setColorNW( 0xffff0000 );
047                    setColorNE( 0xffff00ff );
048                    setColorSW( 0xff0000ff );
049                    setColorSE( 0xff00ffff );
050            }
051    
052            public void setColorNW( int color ) {
053                    this.colorNW = color;
054                    rNW = (color >> 16) & 0xff;
055                    gNW = (color >> 8) & 0xff;
056                    bNW = color & 0xff;
057            }
058    
059            public int getColorNW() {
060                    return colorNW;
061            }
062    
063            public void setColorNE( int color ) {
064                    this.colorNE = color;
065                    rNE = (color >> 16) & 0xff;
066                    gNE = (color >> 8) & 0xff;
067                    bNE = color & 0xff;
068            }
069    
070            public int getColorNE() {
071                    return colorNE;
072            }
073    
074            public void setColorSW( int color ) {
075                    this.colorSW = color;
076                    rSW = (color >> 16) & 0xff;
077                    gSW = (color >> 8) & 0xff;
078                    bSW = color & 0xff;
079            }
080    
081            public int getColorSW() {
082                    return colorSW;
083            }
084    
085            public void setColorSE( int color ) {
086                    this.colorSE = color;
087                    rSE = (color >> 16) & 0xff;
088                    gSE = (color >> 8) & 0xff;
089                    bSE = color & 0xff;
090            }
091    
092            public int getColorSE() {
093                    return colorSE;
094            }
095    
096            public void setDimensions(int width, int height) {
097                    this.width = width;
098                    this.height = height;
099                    super.setDimensions(width, height);
100            }
101    
102            public int filterRGB(int x, int y, int rgb) {
103                    float fx = (float)x / width;
104                    float fy = (float)y / height;
105                    float p, q;
106    
107                    p = rNW + (rNE - rNW) * fx;
108                    q = rSW + (rSE - rSW) * fx;
109                    int r = (int)( p + (q - p) * fy + 0.5f );
110    
111                    p = gNW + (gNE - gNW) * fx;
112                    q = gSW + (gSE - gSW) * fx;
113                    int g = (int)( p + (q - p) * fy + 0.5f );
114    
115                    p = bNW + (bNE - bNW) * fx;
116                    q = bSW + (bSE - bSW) * fx;
117                    int b = (int)( p + (q - p) * fy + 0.5f );
118    
119                    return 0xff000000 | (r << 16) | (g << 8) | b;
120            }
121            
122            public String toString() {
123                    return "Texture/Four Color Fill...";
124            }
125            public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
126                    Object o;
127                    if((o=parameters.removeEL(KeyImpl.init("ColorNW")))!=null)setColorNW(ImageFilterUtil.toIntValue(o,"ColorNW"));
128                    if((o=parameters.removeEL(KeyImpl.init("ColorNE")))!=null)setColorNE(ImageFilterUtil.toIntValue(o,"ColorNE"));
129                    if((o=parameters.removeEL(KeyImpl.init("ColorSW")))!=null)setColorSW(ImageFilterUtil.toIntValue(o,"ColorSW"));
130                    if((o=parameters.removeEL(KeyImpl.init("ColorSE")))!=null)setColorSE(ImageFilterUtil.toIntValue(o,"ColorSE"));
131                    if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){
132                            int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions");
133                            setDimensions(dim[0],dim[1]);
134                    }
135    
136                    // check for arguments not supported
137                    if(parameters.size()>0) {
138                            throw new FunctionException(ThreadLocalPageContext.get(), "ImageFilter", 3, "parameters", "the parameter"+(parameters.size()>1?"s":"")+" ["+List.arrayToList(parameters.keysAsString(),", ")+"] "+(parameters.size()>1?"are":"is")+" not allowed, only the following parameters are supported [ColorNW, ColorNE, ColorSW, ColorSE, Dimensions]");
139                    }
140    
141                    return filter(src, dst);
142            }
143    }