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 replaces one color by another in an image. This is frankly, not often useful, but has its occasional 031 * uses when dealing with GIF transparency and the like. 032 */ 033 public class MapColorsFilter extends PointFilter implements DynFiltering { 034 035 private int oldColor; 036 private int newColor; 037 038 /** 039 * Construct a MapColorsFilter. 040 */ 041 public MapColorsFilter() { 042 this( 0xffffffff, 0xff000000 ); 043 } 044 045 /** 046 * Construct a MapColorsFilter. 047 * @param oldColor the color to replace 048 * @param newColor the color to replace it with 049 */ 050 public MapColorsFilter(int oldColor, int newColor) { 051 canFilterIndexColorModel = true; 052 this.oldColor = oldColor; 053 this.newColor = newColor; 054 } 055 056 public int filterRGB(int x, int y, int rgb) { 057 if (rgb == oldColor) 058 return newColor; 059 return rgb; 060 } 061 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 062 Object o; 063 if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){ 064 int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions"); 065 setDimensions(dim[0],dim[1]); 066 } 067 068 // check for arguments not supported 069 if(parameters.size()>0) { 070 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 [Dimensions]"); 071 } 072 073 return filter(src, dst); 074 } 075 } 076