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 public abstract class TransferFilter extends PointFilter implements DynFiltering { 028 029 protected int[] rTable, gTable, bTable; 030 protected boolean initialized = false; 031 032 public TransferFilter() { 033 canFilterIndexColorModel = true; 034 } 035 036 public int filterRGB(int x, int y, int rgb) { 037 int a = rgb & 0xff000000; 038 int r = (rgb >> 16) & 0xff; 039 int g = (rgb >> 8) & 0xff; 040 int b = rgb & 0xff; 041 r = rTable[r]; 042 g = gTable[g]; 043 b = bTable[b]; 044 return a | (r << 16) | (g << 8) | b; 045 } 046 047 public BufferedImage filter( BufferedImage src, BufferedImage dst ) { 048 if (!initialized) 049 initialize(); 050 return super.filter( src, dst ); 051 } 052 053 protected void initialize() { 054 initialized = true; 055 rTable = gTable = bTable = makeTable(); 056 } 057 058 protected int[] makeTable() { 059 int[] table = new int[256]; 060 for (int i = 0; i < 256; i++) 061 table[i] = PixelUtils.clamp( (int)( 255 * transferFunction( i / 255.0f ) ) ); 062 return table; 063 } 064 065 protected float transferFunction( float v ) { 066 return 0; 067 } 068 069 public int[] getLUT() { 070 if (!initialized) 071 initialize(); 072 int[] lut = new int[256]; 073 for ( int i = 0; i < 256; i++ ) { 074 lut[i] = filterRGB( 0, 0, (i << 24) | (i << 16) | (i << 8) | i ); 075 } 076 return lut; 077 } 078 079 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 080 Object o; 081 if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){ 082 int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions"); 083 setDimensions(dim[0],dim[1]); 084 } 085 086 // check for arguments not supported 087 if(parameters.size()>0) { 088 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]"); 089 } 090 091 return filter(src, dst); 092 } 093 } 094