001/** 002 * 003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved. 004 * 005 * This library is free software; you can redistribute it and/or 006 * modify it under the terms of the GNU Lesser General Public 007 * License as published by the Free Software Foundation; either 008 * version 2.1 of the License, or (at your option) any later version. 009 * 010 * This library is distributed in the hope that it will be useful, 011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 013 * Lesser General Public License for more details. 014 * 015 * You should have received a copy of the GNU Lesser General Public 016 * License along with this library. If not, see <http://www.gnu.org/licenses/>. 017 * 018 **/ 019/* 020* 021 022Licensed under the Apache License, Version 2.0 (the "License"); 023you may not use this file except in compliance with the License. 024You may obtain a copy of the License at 025 026 http://www.apache.org/licenses/LICENSE-2.0 027 028Unless required by applicable law or agreed to in writing, software 029distributed under the License is distributed on an "AS IS" BASIS, 030WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 031See the License for the specific language governing permissions and 032limitations under the License. 033*/ 034 035package lucee.runtime.img.filter;import java.awt.image.BufferedImage; 036 037import lucee.runtime.engine.ThreadLocalPageContext; 038import lucee.runtime.exp.FunctionException; 039import lucee.runtime.exp.PageException; 040import lucee.runtime.img.ImageUtil; 041import lucee.runtime.type.KeyImpl; 042import lucee.runtime.type.Struct; 043import lucee.runtime.type.util.CollectionUtil; 044 045 046 047/** 048 * A filter which unpremultiplies an image's alpha. 049 * Note: this does not change the image type of the BufferedImage 050 */ 051public class UnpremultiplyFilter extends PointFilter implements DynFiltering { 052 053 public UnpremultiplyFilter() { 054 } 055 056 public int filterRGB(int x, int y, int rgb) { 057 int a = (rgb >> 24) & 0xff; 058 int r = (rgb >> 16) & 0xff; 059 int g = (rgb >> 8) & 0xff; 060 int b = rgb & 0xff; 061 if ( a == 0 || a == 255 ) 062 return rgb; 063 064 float f = 255.0f / a; 065 r *= f; 066 g *= f; 067 b *= f; 068 if ( r > 255 ) 069 r = 255; 070 if ( g > 255 ) 071 g = 255; 072 if ( b > 255 ) 073 b = 255; 074 return (a << 24) | (r << 16) | (g << 8) | b; 075 } 076 077 public String toString() { 078 return "Alpha/Unpremultiply"; 079 } 080 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 081 Object o; 082 if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){ 083 int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions"); 084 setDimensions(dim[0],dim[1]); 085 } 086 087 // check for arguments not supported 088 if(parameters.size()>0) { 089 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 [Dimensions]"); 090 } 091 092 return filter(src, dst); 093 } 094} 095