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.Struct; 025 import railo.runtime.type.util.CollectionUtil; 026 027 028 029 /** 030 * A filter which converts an image to grayscale using the NTSC brightness calculation. 031 */ 032 public class GrayscaleFilter extends PointFilter implements DynFiltering { 033 034 public GrayscaleFilter() { 035 canFilterIndexColorModel = true; 036 } 037 038 public int filterRGB(int x, int y, int rgb) { 039 int a = rgb & 0xff000000; 040 int r = (rgb >> 16) & 0xff; 041 int g = (rgb >> 8) & 0xff; 042 int b = rgb & 0xff; 043 // rgb = (r + g + b) / 3; // simple average 044 rgb = (r * 77 + g * 151 + b * 28) >> 8; // NTSC luma 045 return a | (rgb << 16) | (rgb << 8) | rgb; 046 } 047 048 public String toString() { 049 return "Colors/Grayscale"; 050 } 051 052 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 053 Object o; 054 if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){ 055 int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions"); 056 setDimensions(dim[0],dim[1]); 057 } 058 059 // check for arguments not supported 060 if(parameters.size()>0) { 061 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]"); 062 } 063 064 return filter(src, dst); 065 } 066 } 067 068