001/* 002 * $Id: ImageRenderInfo.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: Kevin Day, 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.parser; 045 046import java.io.IOException; 047 048import com.itextpdf.text.pdf.PRStream; 049import com.itextpdf.text.pdf.PdfDictionary; 050import com.itextpdf.text.pdf.PdfIndirectReference; 051import com.itextpdf.text.pdf.PdfReader; 052 053/** 054 * Represents image data from a PDF 055 * @since 5.0.1 056 */ 057public class ImageRenderInfo { 058 /** The coordinate transformation matrix that was in effect when the image was rendered */ 059 private final Matrix ctm; 060 /** A reference to the image XObject */ 061 private final PdfIndirectReference ref; 062 /** the image object to be rendered, if it has been parsed already. Null otherwise. */ 063 private PdfImageObject imageObject = null; 064 065 private ImageRenderInfo(Matrix ctm, PdfIndirectReference ref) { 066 this.ctm = ctm; 067 this.ref = ref; 068 } 069 070 /** 071 * Create an ImageRenderInfo object based on an XObject (this is the most common way of including an image in PDF) 072 * @param ctm the coordinate transformation matrix at the time the image is rendered 073 * @param ref a reference to the image XObject 074 * @return the ImageRenderInfo representing the rendered XObject 075 * @since 5.0.1 076 */ 077 public static ImageRenderInfo createForXObject(Matrix ctm, PdfIndirectReference ref){ 078 return new ImageRenderInfo(ctm, ref); 079 } 080 081 /** 082 * Create an ImageRenderInfo object based on inline image data. This is nowhere near completely thought through 083 * and really just acts as a placeholder. 084 * @param ctm the coordinate transformation matrix at the time the image is rendered 085 * @param imageObject the image object representing the inline image 086 * @return the ImageRenderInfo representing the rendered embedded image 087 * @since 5.0.1 088 */ 089 protected static ImageRenderInfo createdForEmbeddedImage(Matrix ctm, PdfImageObject imageObject){ 090 ImageRenderInfo renderInfo = new ImageRenderInfo(ctm, null); 091 renderInfo.imageObject = imageObject; 092 return renderInfo; 093 } 094 095 /** 096 * Gets an object containing the image dictionary and bytes. 097 * @return an object containing the image dictionary and byte[] 098 * @since 5.0.2 099 */ 100 public PdfImageObject getImage() { 101 try { 102 prepareImageObject(); 103 return imageObject; 104 } catch (IOException e) { 105 return null; 106 } 107 } 108 109 private void prepareImageObject() throws IOException{ 110 if (imageObject != null) 111 return; 112 113 PRStream stream = (PRStream)PdfReader.getPdfObject(ref); 114 imageObject = new PdfImageObject(stream); 115 } 116 117 /** 118 * @return a vector in User space representing the start point of the xobject 119 */ 120 public Vector getStartPoint(){ 121 return new Vector(0, 0, 1).cross(ctm); 122 } 123 124 /** 125 * @return The coordinate transformation matrix active when this image was rendered. Coordinates are in User space. 126 * @since 5.0.3 127 */ 128 public Matrix getImageCTM(){ 129 return ctm; 130 } 131 132 /** 133 * @return the size of the image, in User space units 134 * @since 5.0.3 135 */ 136 public float getArea(){ 137 // the image space area is 1, so we multiply that by the determinant of the CTM to get the transformed area 138 return ctm.getDeterminant(); 139 } 140 141 /** 142 * @return an indirect reference to the image 143 * @since 5.0.2 144 */ 145 public PdfIndirectReference getRef() { 146 return ref; 147 } 148}