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.KeyImpl; 043import lucee.runtime.type.Struct; 044import lucee.runtime.type.util.CollectionUtil; 045 046/** 047 * A filter which allows levels adjustment on an image. 048 */ 049public class LevelsFilter extends WholeImageFilter implements DynFiltering { 050 051 private int[][] lut; 052 private float lowLevel = 0; 053 private float highLevel = 1; 054 private float lowOutputLevel = 0; 055 private float highOutputLevel = 1; 056 057 public LevelsFilter() { 058 } 059 060 public void setLowLevel( float lowLevel ) { 061 this.lowLevel = lowLevel; 062 } 063 064 public float getLowLevel() { 065 return lowLevel; 066 } 067 068 public void setHighLevel( float highLevel ) { 069 this.highLevel = highLevel; 070 } 071 072 public float getHighLevel() { 073 return highLevel; 074 } 075 076 public void setLowOutputLevel( float lowOutputLevel ) { 077 this.lowOutputLevel = lowOutputLevel; 078 } 079 080 public float getLowOutputLevel() { 081 return lowOutputLevel; 082 } 083 084 public void setHighOutputLevel( float highOutputLevel ) { 085 this.highOutputLevel = highOutputLevel; 086 } 087 088 public float getHighOutputLevel() { 089 return highOutputLevel; 090 } 091 092 protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) { 093 Histogram histogram = new Histogram(inPixels, width, height, 0, width); 094 095 int i, j; 096 097 if (histogram.getNumSamples() > 0) { 098 //float scale = 255.0f / histogram.getNumSamples(); 099 lut = new int[3][256]; 100 101 float low = lowLevel * 255; 102 float high = highLevel * 255; 103 if ( low == high ) 104 high++; 105 for (i = 0; i < 3; i++) { 106 for (j = 0; j < 256; j++) 107 lut[i][j] = PixelUtils.clamp( (int)(255 * (lowOutputLevel + (highOutputLevel-lowOutputLevel) * (j-low)/(high-low))) ); 108 } 109 } else 110 lut = null; 111 112 i = 0; 113 for (int y = 0; y < height; y++) 114 for (int x = 0; x < width; x++) { 115 inPixels[i] = filterRGB(x, y, inPixels[i]); 116 i++; 117 } 118 lut = null; 119 120 return inPixels; 121 } 122 123 public int filterRGB(int x, int y, int rgb) { 124 if (lut != null) { 125 int a = rgb & 0xff000000; 126 int r = lut[Histogram.RED][(rgb >> 16) & 0xff]; 127 int g = lut[Histogram.GREEN][(rgb >> 8) & 0xff]; 128 int b = lut[Histogram.BLUE][rgb & 0xff]; 129 130 return a | (r << 16) | (g << 8) | b; 131 } 132 return rgb; 133 } 134 135 public String toString() { 136 return "Colors/Levels..."; 137 } 138 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 139 Object o; 140 if((o=parameters.removeEL(KeyImpl.init("LowLevel")))!=null)setLowLevel(ImageFilterUtil.toFloatValue(o,"LowLevel")); 141 if((o=parameters.removeEL(KeyImpl.init("HighLevel")))!=null)setHighLevel(ImageFilterUtil.toFloatValue(o,"HighLevel")); 142 if((o=parameters.removeEL(KeyImpl.init("LowOutputLevel")))!=null)setLowOutputLevel(ImageFilterUtil.toFloatValue(o,"LowOutputLevel")); 143 if((o=parameters.removeEL(KeyImpl.init("HighOutputLevel")))!=null)setHighOutputLevel(ImageFilterUtil.toFloatValue(o,"HighOutputLevel")); 144 145 // check for arguments not supported 146 if(parameters.size()>0) { 147 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 [LowLevel, HighLevel, LowOutputLevel, HighOutputLevel]"); 148 } 149 150 return filter(src, dst); 151 } 152}