com.itextpdf.kernel.pdf.canvas.wmf.WmfImageHelper Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2018 iText Group NV
Authors: 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
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Boston, MA, 02110-1301 USA, or download the license from the following URL:
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The interactive user interfaces in modified source and object code versions
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*/
package com.itextpdf.kernel.pdf.canvas.wmf;
import com.itextpdf.io.image.ImageType;
import com.itextpdf.kernel.PdfException;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.io.image.ImageData;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.xobject.PdfFormXObject;
import com.itextpdf.kernel.pdf.xobject.PdfXObject;
import java.io.IOException;
import java.io.InputStream;
/**
* Helper class for the WmfImage implementation. Assists in the creation of a {@link com.itextpdf.kernel.pdf.xobject.PdfFormXObject}.
*/
public class WmfImageHelper {
/** Scales the WMF font size. The default value is 0.86. */
public static float wmfFontCorrection = 0.86f;
private WmfImageData wmf;
private float plainWidth;
private float plainHeight;
/**
* Creates a helper instance.
*
* @param wmf the {@link WmfImageData} object
*/
public WmfImageHelper(ImageData wmf) {
if (wmf.getOriginalType() != ImageType.WMF)
throw new IllegalArgumentException("WMF image expected");
this.wmf = (WmfImageData)wmf;
processParameters();
}
/**
* This method checks if the image is a valid WMF and processes some parameters.
*/
private void processParameters() {
InputStream is = null;
try {
String errorID;
if (wmf.getData() == null){
is = wmf.getUrl().openStream();
errorID = wmf.getUrl().toString();
}
else{
is = new java.io.ByteArrayInputStream(wmf.getData());
errorID = "Byte array";
}
InputMeta in = new InputMeta(is);
if (in.readInt() != 0x9AC6CDD7) {
throw new PdfException(PdfException._1IsNotAValidPlaceableWindowsMetafile, errorID);
}
in.readWord();
int left = in.readShort();
int top = in.readShort();
int right = in.readShort();
int bottom = in.readShort();
int inch = in.readWord();
wmf.setDpi(72, 72);
wmf.setHeight((float) (bottom - top) / inch * 72f);
wmf.setWidth((float) (right - left) / inch * 72f);
} catch (IOException e) {
throw new PdfException(PdfException.WmfImageException);
} finally {
if (is != null) {
try {
is.close();
} catch (IOException ignored) { }
}
}
}
/**
* Create a PdfXObject based on the WMF image. The PdfXObject will have the dimensions of the
* WMF image.
*
* @param document PdfDocument to add the PdfXObject to
* @return PdfXObject based on the WMF image
*/
public PdfXObject createFormXObject(PdfDocument document) {
PdfFormXObject pdfForm = new PdfFormXObject(new Rectangle(0, 0, wmf.getWidth(), wmf.getHeight()));
PdfCanvas canvas = new PdfCanvas(pdfForm, document);
InputStream is = null;
try {
if (wmf.getData() == null){
is = wmf.getUrl().openStream();
}
else{
is = new java.io.ByteArrayInputStream(wmf.getData());
}
MetaDo meta = new MetaDo(is, canvas);
meta.readAll();
} catch (IOException e) {
throw new PdfException(PdfException.WmfImageException, e);
} finally {
if (is != null) {
try {
is.close();
} catch (IOException ignored) { }
}
}
return pdfForm;
}
}