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 change the saturation of an image. This works by calculating a grayscale version of the image 031 * and then extrapolating away from it. 032 */ 033 public class SaturationFilter extends PointFilter implements DynFiltering { 034 035 public float amount = 1; 036 037 /** 038 * Construct a SaturationFilter. 039 */ 040 public SaturationFilter() { 041 } 042 043 /** 044 * Construct a SaturationFilter. 045 * The amount of saturation change. 046 */ 047 public SaturationFilter( float amount ) { 048 this.amount = amount; 049 canFilterIndexColorModel = true; 050 } 051 052 /** 053 * Set the amount of saturation change. 1 leaves the image unchanged, values between 0 and 1 desaturate, 0 completely 054 * desaturates it and values above 1 increase the saturation. 055 * @param amount the amount 056 */ 057 public void setAmount( float amount ) { 058 this.amount = amount; 059 } 060 061 /** 062 * Set the amount of saturation change. 063 * @return the amount 064 */ 065 public float getAmount() { 066 return amount; 067 } 068 069 public int filterRGB(int x, int y, int rgb) { 070 if ( amount != 1 ) { 071 int a = rgb & 0xff000000; 072 int r = (rgb >> 16) & 0xff; 073 int g = (rgb >> 8) & 0xff; 074 int b = rgb & 0xff; 075 int v = ( r + g + b )/3; // or a better brightness calculation if you prefer 076 r = PixelUtils.clamp( (int)(v + amount * (r-v)) ); 077 g = PixelUtils.clamp( (int)(v + amount * (g-v)) ); 078 b = PixelUtils.clamp( (int)(v + amount * (b-v)) ); 079 return a | (r << 16) | (g << 8) | b; 080 } 081 return rgb; 082 } 083 084 public String toString() { 085 return "Colors/Saturation..."; 086 } 087 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 088 Object o; 089 if((o=parameters.removeEL(KeyImpl.init("Amount")))!=null)setAmount(ImageFilterUtil.toFloatValue(o,"Amount")); 090 if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){ 091 int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions"); 092 setDimensions(dim[0],dim[1]); 093 } 094 095 // check for arguments not supported 096 if(parameters.size()>0) { 097 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 [Amount, Dimensions]"); 098 } 099 100 return filter(src, dst); 101 } 102 } 103