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 to invert the alpha channel of an image. This is really only useful for inverting selections, where we only use the alpha channel. 031 */ 032 public class InvertAlphaFilter extends PointFilter implements DynFiltering { 033 034 public InvertAlphaFilter() { 035 canFilterIndexColorModel = true; 036 } 037 038 public int filterRGB(int x, int y, int rgb) { 039 return rgb ^ 0xff000000; 040 } 041 042 public String toString() { 043 return "Alpha/Invert"; 044 } 045 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 046 Object o; 047 if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){ 048 int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions"); 049 setDimensions(dim[0],dim[1]); 050 } 051 052 // check for arguments not supported 053 if(parameters.size()>0) { 054 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]"); 055 } 056 057 return filter(src, dst); 058 } 059 }