001/* 002 * $Id: PdfFunction.java 4784 2011-03-15 08:33:00Z blowagie $ 003 * 004 * This file is part of the iText (R) project. 005 * Copyright (c) 1998-2011 1T3XT BVBA 006 * Authors: Bruno Lowagie, Paulo Soares, et al. 007 * 008 * This program is free software; you can redistribute it and/or modify 009 * it under the terms of the GNU Affero General Public License version 3 010 * as published by the Free Software Foundation with the addition of the 011 * following permission added to Section 15 as permitted in Section 7(a): 012 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT, 013 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS. 014 * 015 * This program is distributed in the hope that it will be useful, but 016 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 017 * or FITNESS FOR A PARTICULAR PURPOSE. 018 * See the GNU Affero General Public License for more details. 019 * You should have received a copy of the GNU Affero General Public License 020 * along with this program; if not, see http://www.gnu.org/licenses or write to 021 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 022 * Boston, MA, 02110-1301 USA, or download the license from the following URL: 023 * http://itextpdf.com/terms-of-use/ 024 * 025 * The interactive user interfaces in modified source and object code versions 026 * of this program must display Appropriate Legal Notices, as required under 027 * Section 5 of the GNU Affero General Public License. 028 * 029 * In accordance with Section 7(b) of the GNU Affero General Public License, 030 * a covered work must retain the producer line in every PDF that is created 031 * or manipulated using iText. 032 * 033 * You can be released from the requirements of the license by purchasing 034 * a commercial license. Buying such a license is mandatory as soon as you 035 * develop commercial activities involving the iText software without 036 * disclosing the source code of your own applications. 037 * These activities include: offering paid services to customers as an ASP, 038 * serving PDFs on the fly in a web application, shipping iText with a closed 039 * source product. 040 * 041 * For more information, please contact iText Software Corp. at this 042 * address: sales@itextpdf.com 043 */ 044package com.itextpdf.text.pdf; 045 046import java.io.IOException; 047 048import com.itextpdf.text.ExceptionConverter; 049/** Implements PDF functions. 050 * 051 * @author Paulo Soares 052 */ 053public class PdfFunction { 054 055 protected PdfWriter writer; 056 057 protected PdfIndirectReference reference; 058 059 protected PdfDictionary dictionary; 060 061 /** Creates new PdfFunction */ 062 protected PdfFunction(PdfWriter writer) { 063 this.writer = writer; 064 } 065 066 PdfIndirectReference getReference() { 067 try { 068 if (reference == null) { 069 reference = writer.addToBody(dictionary).getIndirectReference(); 070 } 071 } 072 catch (IOException ioe) { 073 throw new ExceptionConverter(ioe); 074 } 075 return reference; 076 } 077 078 public static PdfFunction type0(PdfWriter writer, float domain[], float range[], int size[], 079 int bitsPerSample, int order, float encode[], float decode[], byte stream[]) { 080 PdfFunction func = new PdfFunction(writer); 081 func.dictionary = new PdfStream(stream); 082 ((PdfStream)func.dictionary).flateCompress(writer.getCompressionLevel()); 083 func.dictionary.put(PdfName.FUNCTIONTYPE, new PdfNumber(0)); 084 func.dictionary.put(PdfName.DOMAIN, new PdfArray(domain)); 085 func.dictionary.put(PdfName.RANGE, new PdfArray(range)); 086 func.dictionary.put(PdfName.SIZE, new PdfArray(size)); 087 func.dictionary.put(PdfName.BITSPERSAMPLE, new PdfNumber(bitsPerSample)); 088 if (order != 1) 089 func.dictionary.put(PdfName.ORDER, new PdfNumber(order)); 090 if (encode != null) 091 func.dictionary.put(PdfName.ENCODE, new PdfArray(encode)); 092 if (decode != null) 093 func.dictionary.put(PdfName.DECODE, new PdfArray(decode)); 094 return func; 095 } 096 097 public static PdfFunction type2(PdfWriter writer, float domain[], float range[], float c0[], float c1[], float n) { 098 PdfFunction func = new PdfFunction(writer); 099 func.dictionary = new PdfDictionary(); 100 func.dictionary.put(PdfName.FUNCTIONTYPE, new PdfNumber(2)); 101 func.dictionary.put(PdfName.DOMAIN, new PdfArray(domain)); 102 if (range != null) 103 func.dictionary.put(PdfName.RANGE, new PdfArray(range)); 104 if (c0 != null) 105 func.dictionary.put(PdfName.C0, new PdfArray(c0)); 106 if (c1 != null) 107 func.dictionary.put(PdfName.C1, new PdfArray(c1)); 108 func.dictionary.put(PdfName.N, new PdfNumber(n)); 109 return func; 110 } 111 112 public static PdfFunction type3(PdfWriter writer, float domain[], float range[], PdfFunction functions[], float bounds[], float encode[]) { 113 PdfFunction func = new PdfFunction(writer); 114 func.dictionary = new PdfDictionary(); 115 func.dictionary.put(PdfName.FUNCTIONTYPE, new PdfNumber(3)); 116 func.dictionary.put(PdfName.DOMAIN, new PdfArray(domain)); 117 if (range != null) 118 func.dictionary.put(PdfName.RANGE, new PdfArray(range)); 119 PdfArray array = new PdfArray(); 120 for (int k = 0; k < functions.length; ++k) 121 array.add(functions[k].getReference()); 122 func.dictionary.put(PdfName.FUNCTIONS, array); 123 func.dictionary.put(PdfName.BOUNDS, new PdfArray(bounds)); 124 func.dictionary.put(PdfName.ENCODE, new PdfArray(encode)); 125 return func; 126 } 127 128 public static PdfFunction type4(PdfWriter writer, float domain[], float range[], String postscript) { 129 byte b[] = new byte[postscript.length()]; 130 for (int k = 0; k < b.length; ++k) 131 b[k] = (byte)postscript.charAt(k); 132 PdfFunction func = new PdfFunction(writer); 133 func.dictionary = new PdfStream(b); 134 ((PdfStream)func.dictionary).flateCompress(writer.getCompressionLevel()); 135 func.dictionary.put(PdfName.FUNCTIONTYPE, new PdfNumber(4)); 136 func.dictionary.put(PdfName.DOMAIN, new PdfArray(domain)); 137 func.dictionary.put(PdfName.RANGE, new PdfArray(range)); 138 return func; 139 } 140}