layout.jar is a component in iText Java library to provide layout 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 iText7-Core-7.1.4.zip. You can download it at iText 7 Core Download site.

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

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

⏎ com/itextpdf/layout/renderer/RotationUtils.java

/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2018 iText Group NV
    Authors: iText Software.

    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: sales@itextpdf.com
 */
package com.itextpdf.layout.renderer;

import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.layout.layout.LayoutArea;
import com.itextpdf.layout.layout.LayoutContext;
import com.itextpdf.layout.layout.LayoutResult;
import com.itextpdf.layout.minmaxwidth.MinMaxWidth;
import com.itextpdf.layout.minmaxwidth.MinMaxWidthUtils;
import com.itextpdf.layout.minmaxwidth.RotationMinMaxWidth;
import com.itextpdf.layout.property.Property;
import com.itextpdf.layout.property.UnitValue;

import java.util.HashMap;

final class RotationUtils {

    private RotationUtils() {
    }

    /**
     * This method tries to calculate min-max-width of rotated element using heuristics
     * of {@link RotationMinMaxWidth#calculate(double, double, MinMaxWidth)}.
     * This method may call {@link IRenderer#layout(LayoutContext)} once in best case
     * (if the width is set on element, or if we are really lucky) and three times in worst case.
     *
     * @param minMaxWidth the minMaxWidth of NOT rotated renderer
     * @param renderer    the actual renderer
     * @return minMaxWidth of rotated renderer or original value in case rotated value can not be calculated, or renderer isn't rotated.
     */
    public static MinMaxWidth countRotationMinMaxWidth(MinMaxWidth minMaxWidth, AbstractRenderer renderer) {
        PropertiesBackup backup = new PropertiesBackup(renderer);
        Float rotation = backup.storeFloatProperty(Property.ROTATION_ANGLE);
        if (rotation != null) {
            float angle = (float) rotation;
            //This width results in more accurate values for min-width calculations.
            float layoutWidth = minMaxWidth.getMaxWidth() + MinMaxWidthUtils.getEps();
            LayoutResult layoutResult = renderer.layout(new LayoutContext(new LayoutArea(1, new Rectangle(layoutWidth, AbstractRenderer.INF))));
            if (layoutResult.getOccupiedArea() != null) {
                Rectangle layoutBBox = layoutResult.getOccupiedArea().getBBox();
                if (MinMaxWidthUtils.isEqual(minMaxWidth.getMinWidth(), minMaxWidth.getMaxWidth())) {
                    backup.restoreProperty(Property.ROTATION_ANGLE);
                    float rotatedWidth = (float) RotationMinMaxWidth.calculateRotatedWidth(layoutBBox, angle);
                    return new MinMaxWidth(rotatedWidth, rotatedWidth, 0);
                }
                double area = layoutResult.getOccupiedArea().getBBox().getWidth() * layoutResult.getOccupiedArea().getBBox().getHeight();
                RotationMinMaxWidth rotationMinMaxWidth = RotationMinMaxWidth.calculate(angle, area, minMaxWidth);
                Float rotatedMinWidth = getLayoutRotatedWidth(renderer, (float) rotationMinMaxWidth.getMinWidthOrigin(), layoutBBox, angle);
                if (rotatedMinWidth != null) {
                    if (rotatedMinWidth > rotationMinMaxWidth.getMaxWidth()) {
                        rotationMinMaxWidth.setChildrenMinWidth((float) rotatedMinWidth);
                        Float rotatedMaxWidth = getLayoutRotatedWidth(renderer, (float) rotationMinMaxWidth.getMaxWidthOrigin(), layoutBBox, angle);
                        if (rotatedMaxWidth != null && rotatedMaxWidth > rotatedMinWidth) {
                            rotationMinMaxWidth.setChildrenMaxWidth((float) rotatedMaxWidth);
                        } else {
                            rotationMinMaxWidth.setChildrenMaxWidth((float) rotatedMinWidth);
                        }
                    } else {
                        rotationMinMaxWidth.setChildrenMinWidth((float) rotatedMinWidth);
                    }
                    backup.restoreProperty(Property.ROTATION_ANGLE);
                    return rotationMinMaxWidth;
                }
            }
        }
        backup.restoreProperty(Property.ROTATION_ANGLE);
        return minMaxWidth;
    }

    /**
     * This method tries to calculate width of not rotated renderer, so after rotation it fits availableWidth.
     * This method uses heuristics of {@link RotationMinMaxWidth#calculate(double, double, MinMaxWidth, double)}.
     * It doesn't take into account any of height properties of renderer or height of layoutArea.
     * The minMaxWidth calculations and initial layout may take long time, but they won't be called if the renderer have width property.
     *
     * @param availableWidth the width of layoutArea
     * @param renderer       the actual renderer
     * @return the width that should be set as width of layout area to properly layout element, or fallback to
     * {@link AbstractRenderer#retrieveWidth(float)} in case it can not be calculated, or renderer isn't rotated.
     */
    public static Float retrieveRotatedLayoutWidth(float availableWidth, AbstractRenderer renderer) {
        PropertiesBackup backup = new PropertiesBackup(renderer);
        Float rotation = backup.storeFloatProperty(Property.ROTATION_ANGLE);
        if (rotation != null && renderer.<UnitValue>getProperty(Property.WIDTH) == null) {
            float angle = (float) rotation;
            backup.<UnitValue>storeProperty(Property.HEIGHT);
            backup.<UnitValue>storeProperty(Property.MIN_HEIGHT);
            backup.<UnitValue>storeProperty(Property.MAX_HEIGHT);
            MinMaxWidth minMaxWidth = renderer.getMinMaxWidth();
            //Using this width for initial layout helps in case of small elements. They may have more free spaces but it's more likely they fit.
            float length = (minMaxWidth.getMaxWidth() + minMaxWidth.getMinWidth()) / 2 + MinMaxWidthUtils.getEps();
            LayoutResult layoutResult = renderer.layout(new LayoutContext(new LayoutArea(1, new Rectangle(length, AbstractRenderer.INF))));
            backup.restoreProperty(Property.HEIGHT);
            backup.restoreProperty(Property.MIN_HEIGHT);
            backup.restoreProperty(Property.MAX_HEIGHT);

            Rectangle additions = new Rectangle(0, 0);
            renderer.applyPaddings(additions, true);
            renderer.applyBorderBox(additions, true);
            renderer.applyMargins(additions, true);

            if (layoutResult.getOccupiedArea() != null) {
                double area = layoutResult.getOccupiedArea().getBBox().getWidth() * layoutResult.getOccupiedArea().getBBox().getHeight();
                RotationMinMaxWidth result = RotationMinMaxWidth.calculate(angle, area, minMaxWidth, availableWidth);
                if (result != null) {
                    backup.restoreProperty(Property.ROTATION_ANGLE);
                    if (result.getMaxWidthHeight() > result.getMinWidthHeight()) {
                        return (float) (result.getMinWidthOrigin() - additions.getWidth() + MinMaxWidthUtils.getEps());
                    } else {
                        return (float) (result.getMaxWidthOrigin() - additions.getWidth() + MinMaxWidthUtils.getEps());
                    }
                }
            }
        }
        backup.restoreProperty(Property.ROTATION_ANGLE);
        return renderer.retrieveWidth(availableWidth);
    }

    //Get actual width of element based on it's layout. May use occupied are of layout result of initial layout for time saving.
    private static Float getLayoutRotatedWidth(AbstractRenderer renderer, float availableWidth, Rectangle previousBBox, double angle) {
        if (MinMaxWidthUtils.isEqual(availableWidth, previousBBox.getWidth())) {
            return (float) RotationMinMaxWidth.calculateRotatedWidth(previousBBox, angle);
        }
        LayoutResult result = renderer.layout(new LayoutContext(new LayoutArea(1, new Rectangle(availableWidth + MinMaxWidthUtils.getEps(), AbstractRenderer.INF))));
        if (result.getOccupiedArea() != null) {
            return (float) RotationMinMaxWidth.calculateRotatedWidth(result.getOccupiedArea().getBBox(), angle);
        }
        return null;
    }

    private static class PropertiesBackup {

        private AbstractRenderer renderer;
        private HashMap<Integer, PropertyBackup> propertiesBackup = new HashMap<>();

        public PropertiesBackup(AbstractRenderer renderer) {
            this.renderer = renderer;
        }

        //workaround for autoport
        public Float storeFloatProperty(int property) {
            Float value = renderer.getPropertyAsFloat(property);
            if (value != null) {
                propertiesBackup.put(property, new PropertyBackup(value, renderer.hasOwnProperty(property)));
                renderer.setProperty(property, null);
            }
            return value;
        }

        public <T> T storeProperty(int property) {
            T value = renderer.<T>getProperty(property);
            if (value != null) {
                propertiesBackup.put(property, new PropertyBackup(value, renderer.hasOwnProperty(property)));
                renderer.setProperty(property, null);
            }
            return value;
        }

        public void restoreProperty(int property) {
            PropertyBackup backup = propertiesBackup.remove(property);
            if (backup != null) {
                if (backup.isOwnedByRender()) {
                    renderer.setProperty(property, backup.getValue());
                } else {
                    renderer.deleteOwnProperty(property);
                }
            }
        }

        private static class PropertyBackup {
            private Object propertyValue;
            private boolean isOwnedByRender;

            public PropertyBackup(Object propertyValue, boolean isOwnedByRender) {
                this.propertyValue = propertyValue;
                this.isOwnedByRender = isOwnedByRender;
            }

            public Object getValue() {
                return propertyValue;
            }

            public boolean isOwnedByRender() {
                return isOwnedByRender;
            }
        }
    }
}

⏎ com/itextpdf/layout/renderer/RotationUtils.java

 

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