iText kernel.jar Source Code

kernel.jar is a component in iText Java library to provide low-level functionalities. iText Java library allows you to generate and manage PDF documents.

The Source Code files are provided together with the JAR file in the binary packge like You can download it at iText 7 Core Download site.

You can compile it to generate your JAR file, using kernel.pom as the build configuration file.

The source code of kernel-7.1.4.jar is provided below:



    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):

    This program is distributed in the hope that it will be useful, but
    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
    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 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:

    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
package com.itextpdf.kernel.pdf.canvas.parser.clipper;

import com.itextpdf.kernel.geom.Subpath;
import com.itextpdf.kernel.pdf.canvas.PdfCanvasConstants;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

 * This class contains variety of methods allowing to convert iText
 * abstractions into the abstractions of the Clipper library and vise versa.
 * <p>
 * For example:
 * <ul>
 *     <li>{@link PolyTree} to {@link com.itextpdf.kernel.geom.Path}</li>
 *     <li>{@link com.itextpdf.kernel.geom.Point} to {@link Point.LongPoint}</li>
 *     <li>{@link Point.LongPoint} to {@link com.itextpdf.kernel.geom.Point}</li>
 * </ul>
 * <p>
public class ClipperBridge {

     * Since the clipper library uses integer coordinates, we should convert
     * our floating point numbers into fixed point numbers by multiplying by
     * this coefficient. Vary it to adjust the preciseness of the calculations.
    public static double floatMultiplier = Math.pow(10, 14);

     * Converts Clipper library {@link PolyTree} abstraction into iText
     * {@link com.itextpdf.kernel.geom.Path} object.
    public static com.itextpdf.kernel.geom.Path convertToPath(PolyTree result) {
        com.itextpdf.kernel.geom.Path path = new com.itextpdf.kernel.geom.Path();
        PolyNode node = result.getFirst();

        while (node != null) {
            addContour(path, node.getContour(), !node.isOpen());
            node = node.getNext();

        return path;

     * Adds iText {@link Path} to the given {@link IClipper} object.
     * @param clipper The {@link IClipper} object.
     * @param path The {@link com.itextpdf.kernel.geom.Path} object to be added to the {@link IClipper}.
     * @param polyType See {@link IClipper.PolyType}.
    public static void addPath(IClipper clipper, com.itextpdf.kernel.geom.Path path, IClipper.PolyType polyType) {
        for (Subpath subpath : path.getSubpaths()) {
            if (!subpath.isSinglePointClosed() && !subpath.isSinglePointOpen()) {
                List<com.itextpdf.kernel.geom.Point> linearApproxPoints = subpath.getPiecewiseLinearApproximation();
                clipper.addPath(new Path(convertToLongPoints(linearApproxPoints)), polyType, subpath.isClosed());

     * Adds all iText {@link Subpath}s of the iText {@link Path} to the {@link ClipperOffset} object with one
     * note: it doesn't add degenerate subpaths.
     * @return {@link java.util.List} consisting of all degenerate iText {@link Subpath}s of the path.
    public static List<Subpath> addPath(ClipperOffset offset, com.itextpdf.kernel.geom.Path path, IClipper.JoinType joinType, IClipper.EndType endType) {
        List<Subpath> degenerateSubpaths = new ArrayList<>();

        for (Subpath subpath : path.getSubpaths()) {
            if (subpath.isDegenerate()) {

            if (!subpath.isSinglePointClosed() && !subpath.isSinglePointOpen()) {
                IClipper.EndType et;

                if (subpath.isClosed()) {
                    // Offsetting is never used for path being filled
                    et = IClipper.EndType.CLOSED_LINE;
                } else {
                    et = endType;

                List<com.itextpdf.kernel.geom.Point> linearApproxPoints = subpath.getPiecewiseLinearApproximation();
                offset.addPath(new Path(convertToLongPoints(linearApproxPoints)), joinType, et);

        return degenerateSubpaths;

     * Converts list of {@link Point.LongPoint} objects into list of
     * {@link com.itextpdf.kernel.geom.Point} objects.
    public static List<com.itextpdf.kernel.geom.Point> convertToFloatPoints(List<Point.LongPoint> points) {
        List<com.itextpdf.kernel.geom.Point> convertedPoints = new ArrayList<>(points.size());

        for (Point.LongPoint point : points) {
            convertedPoints.add(new com.itextpdf.kernel.geom.Point(
                    point.getX() / floatMultiplier,
                    point.getY() / floatMultiplier

        return convertedPoints;

     * Converts list of {@link com.itextpdf.kernel.geom.Point} objects into list of
     * {@link Point.LongPoint} objects.
    public static List<Point.LongPoint> convertToLongPoints(List<com.itextpdf.kernel.geom.Point> points) {
        List<Point.LongPoint> convertedPoints = new ArrayList<>(points.size());

        for (com.itextpdf.kernel.geom.Point point : points) {
            convertedPoints.add(new Point.LongPoint(
                    floatMultiplier * point.getX(),
                    floatMultiplier * point.getY()

        return convertedPoints;

     * Converts iText line join style constant into the corresponding constant
     * of the Clipper library.
     * @param lineJoinStyle iText line join style constant. See {@link PdfCanvasConstants}
     * @return Clipper line join style constant.
    public static IClipper.JoinType getJoinType(int lineJoinStyle) {
        switch (lineJoinStyle) {
            case PdfCanvasConstants.LineJoinStyle.BEVEL:
                return IClipper.JoinType.BEVEL;

            case PdfCanvasConstants.LineJoinStyle.MITER:
                return IClipper.JoinType.MITER;

        return IClipper.JoinType.ROUND;

     * Converts iText line cap style constant into the corresponding constant
     * of the Clipper library.
     * @param lineCapStyle iText line cap style constant. See {@link PdfCanvasConstants}
     * @return Clipper line cap (end type) style constant.
    public static IClipper.EndType getEndType(int lineCapStyle) {
        switch (lineCapStyle) {
            case PdfCanvasConstants.LineCapStyle.BUTT:
                return IClipper.EndType.OPEN_BUTT;

            case PdfCanvasConstants.LineCapStyle.PROJECTING_SQUARE:
                return IClipper.EndType.OPEN_SQUARE;

        return IClipper.EndType.OPEN_ROUND;

     * Converts iText filling rule constant into the corresponding constant
     * of the Clipper library .
     * @param fillingRule Either {@link com.itextpdf.kernel.pdf.canvas.PdfCanvasConstants.FillingRule#NONZERO_WINDING} or
     *                    {@link com.itextpdf.kernel.pdf.canvas.PdfCanvasConstants.FillingRule#EVEN_ODD}.
     * @return Clipper fill type constant.
    public static IClipper.PolyFillType getFillType(int fillingRule) {
        IClipper.PolyFillType fillType = IClipper.PolyFillType.NON_ZERO;

        if (fillingRule == PdfCanvasConstants.FillingRule.EVEN_ODD) {
            fillType = IClipper.PolyFillType.EVEN_ODD;

        return fillType;

    static void addContour(com.itextpdf.kernel.geom.Path path, List<Point.LongPoint> contour, boolean close) {
        List<com.itextpdf.kernel.geom.Point> floatContour = convertToFloatPoints(contour);
        com.itextpdf.kernel.geom.Point point = floatContour.get(0);
        path.moveTo((float) point.getX(), (float) point.getY());

        for (int i = 1; i < floatContour.size(); i++) {
            point = floatContour.get(i);
            path.lineTo((float) point.getX(), (float) point.getY());

        if (close) {

    public static void addRectToClipper(IClipper clipper, com.itextpdf.kernel.geom.Point[] rectVertices, IClipper.PolyType polyType) {
        clipper.addPath(new Path(convertToLongPoints(new ArrayList<>(Arrays.asList(rectVertices)))), polyType, true);



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2010-02-18, 48534👍, 0💬