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.Rectangle; 036import java.awt.image.BufferedImage; 037 038import lucee.runtime.engine.ThreadLocalPageContext; 039import lucee.runtime.exp.FunctionException; 040import lucee.runtime.exp.PageException; 041import lucee.runtime.img.ImageUtil; 042import lucee.runtime.type.Struct; 043import lucee.runtime.type.util.CollectionUtil; 044 045/** 046 * A filter to perform auto-equalization on an image. 047 */ 048public class EqualizeFilter extends WholeImageFilter implements DynFiltering { 049 050 private int[][] lut; 051 052 public EqualizeFilter() { 053 } 054 055 protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) { 056 Histogram histogram = new Histogram(inPixels, width, height, 0, width); 057 058 int i, j; 059 060 if (histogram.getNumSamples() > 0) { 061 float scale = 255.0f / histogram.getNumSamples(); 062 lut = new int[3][256]; 063 for (i = 0; i < 3; i++) { 064 lut[i][0] = histogram.getFrequency(i, 0); 065 for (j = 1; j < 256; j++) 066 lut[i][j] = lut[i][j-1] + histogram.getFrequency(i, j); 067 for (j = 0; j < 256; j++) 068 lut[i][j] = Math.round(lut[i][j]*scale); 069 } 070 } else 071 lut = null; 072 073 i = 0; 074 for (int y = 0; y < height; y++) 075 for (int x = 0; x < width; x++) { 076 inPixels[i] = filterRGB(x, y, inPixels[i]); 077 i++; 078 } 079 lut = null; 080 081 return inPixels; 082 } 083 084 private int filterRGB(int x, int y, int rgb) { 085 if (lut != null) { 086 int a = rgb & 0xff000000; 087 int r = lut[Histogram.RED][(rgb >> 16) & 0xff]; 088 int g = lut[Histogram.GREEN][(rgb >> 8) & 0xff]; 089 int b = lut[Histogram.BLUE][rgb & 0xff]; 090 091 return a | (r << 16) | (g << 8) | b; 092 } 093 return rgb; 094 } 095 096 public String toString() { 097 return "Colors/Equalize"; 098 } 099 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 100 //Object o; 101 102 // check for arguments not supported 103 if(parameters.size()>0) { 104 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 []"); 105 } 106 107 return filter(src, dst); 108 } 109}