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    
020    import railo.runtime.engine.ThreadLocalPageContext;
021    import railo.runtime.exp.FunctionException;
022    import railo.runtime.exp.PageException;
023    import railo.runtime.img.ImageUtil;
024    import railo.runtime.type.KeyImpl;
025    import railo.runtime.type.List;
026    import railo.runtime.type.Struct;
027    
028    public class ShearFilter extends TransformFilter  implements DynFiltering {
029    
030            private float xangle = 0.0f;
031            private float yangle = 0.0f;
032            private float shx = 0.0f;
033            private float shy = 0.0f;
034            private float xoffset = 0.0f;
035            private float yoffset = 0.0f;
036            private boolean resize = true;
037    
038            public ShearFilter() {
039            }
040    
041            public void setResize(boolean resize) {
042                    this.resize = resize;
043            }
044    
045            public boolean isResize() {
046                    return resize;
047            }
048    
049            public void setXAngle(float xangle) {
050                    this.xangle = xangle;
051                    initialize();
052            }
053    
054            public float getXAngle() {
055                    return xangle;
056            }
057    
058            public void setYAngle(float yangle) {
059                    this.yangle = yangle;
060                    initialize();
061            }
062    
063            public float getYAngle() {
064                    return yangle;
065            }
066    
067            private void initialize() {
068                    shx = (float)Math.sin(xangle);
069                    shy = (float)Math.sin(yangle);
070            }
071            
072            protected void transformSpace(Rectangle r) {
073                    float tangent = (float)Math.tan(xangle);
074                    xoffset = -r.height * tangent;
075                    if (tangent < 0.0)
076                            tangent = -tangent;
077                    r.width = (int)(r.height * tangent + r.width + 0.999999f);
078                    tangent = (float)Math.tan(yangle);
079                    yoffset = -r.width * tangent;
080                    if (tangent < 0.0)
081                            tangent = -tangent;
082                    r.height = (int)(r.width * tangent + r.height + 0.999999f);
083            }
084    
085    /*
086            public void imageComplete(int status) {
087    try {
088                    if (status == IMAGEERROR || status == IMAGEABORTED) {
089                            consumer.imageComplete(status);
090                            return;
091                    }
092    
093                    int width = originalSpace.width;
094                    int height = originalSpace.height;
095    
096                    float tangent = Math.tan(angle);
097                    if (tangent < 0.0)
098                            tangent = -tangent;
099                    int newWidth = (int)(height * tangent + width + 0.999999);
100                    int[] outPixels = new int[height*newWidth];
101                    int inIndex = 0;
102                    int yOffset = 0;
103                    for (int y = 0; y < height; y++) {
104                            float newCol;
105                            if (angle >= 0.0)
106                                    newCol = y * tangent;
107                            else
108                                    newCol = (height-y) * tangent;
109                            int iNewCol = (int)newCol;
110                            float f = newCol - iNewCol;
111                            f = 1.0 - f;
112    
113                            int outIndex = yOffset+iNewCol;
114                            int lastRGB = inPixels[inIndex];
115                            for (int x = 0; x < width; x++) {
116                                    int rgb = inPixels[inIndex];
117                                    outPixels[outIndex] = ImageMath.mixColors(f, lastRGB, rgb);
118                                    lastRGB = rgb;
119                                    inIndex++;
120                                    outIndex++;
121                            }
122                            outPixels[outIndex] = ImageMath.mixColors(f, lastRGB, 0);
123                            yOffset += newWidth;
124                    }
125                    consumer.setPixels(0, 0, newWidth, height, defaultRGBModel, outPixels, 0, newWidth);
126                    consumer.imageComplete(status);
127                    inPixels = null;
128    }
129    catch (Exception e) {
130            
131    }
132            }
133    */
134            
135            protected void transformInverse(int x, int y, float[] out) {
136                    out[0] = x + xoffset + (y * shx);
137                    out[1] = y + yoffset + (x * shy);
138            }
139    
140            public String toString() {
141                    return "Distort/Shear...";
142            }
143    
144            public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
145                    Object o;
146                    if((o=parameters.removeEL(KeyImpl.init("Resize")))!=null)setResize(ImageFilterUtil.toBooleanValue(o,"Resize"));
147                    if((o=parameters.removeEL(KeyImpl.init("XAngle")))!=null)setXAngle(ImageFilterUtil.toFloatValue(o,"XAngle"));
148                    if((o=parameters.removeEL(KeyImpl.init("YAngle")))!=null)setYAngle(ImageFilterUtil.toFloatValue(o,"YAngle"));
149                    if((o=parameters.removeEL(KeyImpl.init("EdgeAction")))!=null)setEdgeAction(ImageFilterUtil.toString(o,"EdgeAction"));
150                    if((o=parameters.removeEL(KeyImpl.init("Interpolation")))!=null)setInterpolation(ImageFilterUtil.toString(o,"Interpolation"));
151    
152                    // check for arguments not supported
153                    if(parameters.size()>0) {
154                            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 [Resize, XAngle, YAngle, EdgeAction, Interpolation]");
155                    }
156    
157                    return filter(src, dst);
158            }
159    }