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; 026 027 028 029 /** 030 * A filter which uses the brightness of each pixel to lookup a color from a colormap. 031 */ 032 public class LookupFilter extends PointFilter implements DynFiltering { 033 034 private Colormap colormap = new Gradient(); 035 036 /** 037 * Construct a LookupFilter. 038 */ 039 public LookupFilter() { 040 canFilterIndexColorModel = true; 041 } 042 043 /** 044 * Construct a LookupFilter. 045 * @param colormap the color map 046 */ 047 public LookupFilter(Colormap colormap) { 048 canFilterIndexColorModel = true; 049 this.colormap = colormap; 050 } 051 052 /** 053 * Set the colormap to be used for the filter. 054 * @param colormap the colormap 055 * @see #getColormap 056 */ 057 public void setColormap(Colormap colormap) { 058 this.colormap = colormap; 059 } 060 061 /** 062 * Get the colormap to be used for the filter. 063 * @return the colormap 064 * @see #setColormap 065 */ 066 public Colormap getColormap() { 067 return colormap; 068 } 069 070 public int filterRGB(int x, int y, int rgb) { 071 // int a = rgb & 0xff000000; 072 int r = (rgb >> 16) & 0xff; 073 int g = (rgb >> 8) & 0xff; 074 int b = rgb & 0xff; 075 rgb = (r + g + b) / 3; 076 return colormap.getColor(rgb/255.0f); 077 } 078 079 public String toString() { 080 return "Colors/Lookup..."; 081 } 082 083 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 084 Object o; 085 if((o=parameters.removeEL(KeyImpl.init("Colormap")))!=null)setColormap(ImageFilterUtil.toColormap(o,"Colormap")); 086 if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){ 087 int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions"); 088 setDimensions(dim[0],dim[1]); 089 } 090 091 // check for arguments not supported 092 if(parameters.size()>0) { 093 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 [Colormap, Dimensions]"); 094 } 095 096 return filter(src, dst); 097 } 098 } 099 100