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iText, a free Java-PDF library
/*
* $Id: d9a4121be6a602ae5813ac1fcd0c3ceeac40e254 $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2015 iText Group NV
* Authors: Kevin Day, Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text.pdf.parser;
import java.io.IOException;
import com.itextpdf.text.pdf.PRStream;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfIndirectReference;
import com.itextpdf.text.pdf.PdfReader;
/**
* Represents image data from a PDF
* @since 5.0.1
*/
public class ImageRenderInfo {
/** The coordinate transformation matrix that was in effect when the image was rendered */
private final Matrix ctm;
/** A reference to the image XObject */
private final PdfIndirectReference ref;
/** A reference to an inline image */
private final InlineImageInfo inlineImageInfo;
/** the color space associated with the image */
private final PdfDictionary colorSpaceDictionary;
/** the image object to be rendered, if it has been parsed already. Null otherwise. */
private PdfImageObject imageObject = null;
private ImageRenderInfo(Matrix ctm, PdfIndirectReference ref, PdfDictionary colorSpaceDictionary) {
this.ctm = ctm;
this.ref = ref;
this.inlineImageInfo = null;
this.colorSpaceDictionary = colorSpaceDictionary;
}
private ImageRenderInfo(Matrix ctm, InlineImageInfo inlineImageInfo, PdfDictionary colorSpaceDictionary) {
this.ctm = ctm;
this.ref = null;
this.inlineImageInfo = inlineImageInfo;
this.colorSpaceDictionary = colorSpaceDictionary;
}
/**
* Create an ImageRenderInfo object based on an XObject (this is the most common way of including an image in PDF)
* @param ctm the coordinate transformation matrix at the time the image is rendered
* @param ref a reference to the image XObject
* @return the ImageRenderInfo representing the rendered XObject
* @since 5.0.1
*/
public static ImageRenderInfo createForXObject(Matrix ctm, PdfIndirectReference ref, PdfDictionary colorSpaceDictionary){
return new ImageRenderInfo(ctm, ref, colorSpaceDictionary);
}
/**
* Create an ImageRenderInfo object based on inline image data. This is nowhere near completely thought through
* and really just acts as a placeholder.
* @param ctm the coordinate transformation matrix at the time the image is rendered
* @param imageObject the image object representing the inline image
* @return the ImageRenderInfo representing the rendered embedded image
* @since 5.0.1
*/
protected static ImageRenderInfo createForEmbeddedImage(Matrix ctm, InlineImageInfo inlineImageInfo, PdfDictionary colorSpaceDictionary){
ImageRenderInfo renderInfo = new ImageRenderInfo(ctm, inlineImageInfo, colorSpaceDictionary);
return renderInfo;
}
/**
* Gets an object containing the image dictionary and bytes.
* @return an object containing the image dictionary and byte[]
* @since 5.0.2
*/
public PdfImageObject getImage() throws IOException {
prepareImageObject();
return imageObject;
}
private void prepareImageObject() throws IOException{
if (imageObject != null)
return;
if (ref != null){
PRStream stream = (PRStream)PdfReader.getPdfObject(ref);
imageObject = new PdfImageObject(stream, colorSpaceDictionary);
} else if (inlineImageInfo != null){
imageObject = new PdfImageObject(inlineImageInfo.getImageDictionary(), inlineImageInfo.getSamples(), colorSpaceDictionary);
}
}
/**
* @return a vector in User space representing the start point of the xobject
*/
public Vector getStartPoint(){
return new Vector(0, 0, 1).cross(ctm);
}
/**
* @return The coordinate transformation matrix active when this image was rendered. Coordinates are in User space.
* @since 5.0.3
*/
public Matrix getImageCTM(){
return ctm;
}
/**
* @return the size of the image, in User space units
* @since 5.0.3
*/
public float getArea(){
// the image space area is 1, so we multiply that by the determinant of the CTM to get the transformed area
return ctm.getDeterminant();
}
/**
* @return an indirect reference to the image
* @since 5.0.2
*/
public PdfIndirectReference getRef() {
return ref;
}
}