com.itextpdf.kernel.pdf.canvas.wmf.WmfImageHelper Maven / Gradle / Ivy
/*
This file is part of the iText (R) project.
Copyright (c) 1998-2022 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
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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
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*/
package com.itextpdf.kernel.pdf.canvas.wmf;
import com.itextpdf.io.image.ImageType;
import com.itextpdf.kernel.exceptions.PdfException;
import com.itextpdf.kernel.exceptions.KernelExceptionMessageConstant;
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(KernelExceptionMessageConstant.NOT_A_VALID_PLACEABLE_WINDOWS_METAFILE, 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(KernelExceptionMessageConstant.WMF_IMAGE_EXCEPTION);
} 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(KernelExceptionMessageConstant.WMF_IMAGE_EXCEPTION, e);
} finally {
if (is != null) {
try {
is.close();
} catch (IOException ignored) { }
}
}
return pdfForm;
}
}