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 premultiplies an image's alpha. 031 * Note: this does not change the image type of the BufferedImage 032 */ 033 public class PremultiplyFilter extends PointFilter implements DynFiltering { 034 035 public PremultiplyFilter() { 036 } 037 038 public int filterRGB(int x, int y, int rgb) { 039 int a = (rgb >> 24) & 0xff; 040 int r = (rgb >> 16) & 0xff; 041 int g = (rgb >> 8) & 0xff; 042 int b = rgb & 0xff; 043 float f = a * (1.0f / 255.0f); 044 r *= f; 045 g *= f; 046 b *= f; 047 return (a << 24) | (r << 16) | (g << 8) | b; 048 } 049 050 public String toString() { 051 return "Alpha/Premultiply"; 052 } 053 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 054 Object o; 055 if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){ 056 int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions"); 057 setDimensions(dim[0],dim[1]); 058 } 059 060 // check for arguments not supported 061 if(parameters.size()>0) { 062 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]"); 063 } 064 065 return filter(src, dst); 066 } 067 } 068