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/render/pcl/PCLRenderingMode.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: PCLRenderingMode.java 1356755 2012-07-03 14:32:03Z mehdi $ */

package org.apache.fop.render.pcl;

import java.io.ObjectStreamException;

/**
 * Enumeration class for PCL rendering modes.
 */
public enum PCLRenderingMode {
    /** "Quality" rendering (mixed native and bitmap for improved quality) */
    QUALITY("quality", 1.0f),
    /** "Speed" rendering (maximum speed with native rendering, reduced visual quality) */
    SPEED("speed", 0.25f),
    /**
     * "Bitmap" rendering (pages are painted entirely as bitmaps, maximum quality,
     * reduced performance)
     */
    BITMAP("bitmap", 1.0f);

    private static final long serialVersionUID = 6359884255324755026L;
    private String name;
    private float defaultDitheringQuality;

    /**
     * Constructor to add a new named item.
     * @param name Name of the item.
     * @param defaultDitheringQuality the default dithering quality (0.0f..1.0f)
     */
    private PCLRenderingMode(String name, float defaultDitheringQuality) {
        this.name = name;
        this.defaultDitheringQuality = defaultDitheringQuality;
    }

    /** @return the name of the enum */
    public String getName() {
        return this.name;
    }

    /**
     * Returns the default dithering quality for this rendering mode.
     * @return the default dithering quality (0.0f..1.0f)
     */
    public float getDefaultDitheringQuality() {
        return this.defaultDitheringQuality;
    }

    /**
     * Returns the enumeration/singleton object based on its name.
     * @param name the name of the enumeration value
     * @return the enumeration object
     */
    public static PCLRenderingMode getValueOf(String name) {
        for (PCLRenderingMode mode : PCLRenderingMode.values()) {
            if (mode.getName().equalsIgnoreCase(name)) {
                return mode;
            }
        }
        throw new IllegalArgumentException("Illegal value for enumeration: " + name);
    }

    private Object readResolve() throws ObjectStreamException {
        return getValueOf(getName());
    }

    /** {@inheritDoc} */
    @Override
    public String toString() {
        return "PCLRenderingMode:" + name;
    }
}

⏎ org/apache/fop/render/pcl/PCLRenderingMode.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)