What Is fop.jar? I got it from the fop-2.7-bin.zip.

fop.jar in fop-2.7-bin.zip is the JAR file for FOP 2.7, which is a print formatter driven by XSL formatting objects (XSL-FO). You can obtain fop.jar from the build folder of the fop-2.7-bin.zip file.

Below is the information about the fop.jar (2.2) file:

JAR File Size and Download Location:

JAR name: fop.jar, fop-2.7.jar
Target JDK version: 1.7
File name: fop.jar
File size: 4442817 bytes
Release date: 20-Jan-2022
Download: Apache FOP Website

Java source code files for fop.jar:

⏎ org/apache/fop/afp/AFPUnitConverter.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* $Id: AFPUnitConverter.java 746664 2009-02-22 12:40:44Z jeremias $ */

package org.apache.fop.afp;

import java.awt.geom.AffineTransform;



/**
 * AFP Unit converter
 */
public class AFPUnitConverter {

    /** the AFP state */
    private final AFPPaintingState paintingState;

    /**
     * Unit converter
     *
     * @param paintingState the AFP painting state
     */
    public AFPUnitConverter(AFPPaintingState paintingState) {
        this.paintingState = paintingState;
    }

    /**
     * Converts millipoints to units
     *
     * @param srcPts source points
     * @param dstPts destination points
     * @return transformed points
     */
    public int[] mpts2units(float[] srcPts, float[] dstPts) {
        return transformPoints(srcPts, dstPts, true);
    }

    /**
     * Converts points to units
     *
     * @param srcPts source points
     * @param dstPts destination points
     * @return transformed points
     */
    public int[] pts2units(float[] srcPts, float[] dstPts) {
        return transformPoints(srcPts, dstPts, false);
    }

    /**
     * Converts millipoints to units
     *
     * @param srcPts source points
     * @return transformed points
     */
    public int[] mpts2units(float[] srcPts) {
        return transformPoints(srcPts, null, true);
    }

    /**
     * Converts points to units
     *
     * @param srcPts source points
     * @return transformed points
     */
    public int[] pts2units(float[] srcPts) {
        return transformPoints(srcPts, null, false);
    }

    /**
     * Converts point to unit
     *
     * @param pt point
     * @return transformed point
     */
    public float pt2units(float pt) {
        return pt / ((float)AFPConstants.DPI_72 / paintingState.getResolution());
    }

    /**
     * Converts millipoint to unit
     *
     * @param mpt millipoint
     * @return transformed point
     */
    public float mpt2units(float mpt) {
        return mpt / ((float)AFPConstants.DPI_72_MPTS / paintingState.getResolution());
    }

    private int[] transformPoints(float[] srcPts, float[] dstPts, boolean milli) {
        if (dstPts == null) {
            dstPts = new float[srcPts.length];
        }
        AffineTransform at = paintingState.getData().getTransform();
        at.transform(srcPts, 0, dstPts, 0, srcPts.length / 2);
        int[] coords = new int[srcPts.length];
        for (int i = 0; i < srcPts.length; i++) {
            if (!milli) {
                dstPts[i] *= 1000;
            }
            coords[i] = Math.round(dstPts[i]);
        }
        return coords;
    }

}

⏎ org/apache/fop/afp/AFPUnitConverter.java

Or download all of them as a single archive file:

File name: fop-2.7-src.zip
File size: 3401312 bytes
Release date: 2022-01-20
Download 

⇒ "fop" Command in fop-2.7-bin.zip

⇐ What Is fop-2.7-bin.zip

⇑ Download and Installing of FOP 2.x

⇑⇑ FAQ for FOP (Formatting Object Processor)