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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
 * https://plantuml.com/liberapay (only 1€ per month!)
 * https://plantuml.com/paypal
 *
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License V2.
 *
 * THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
 * LICENSE ("AGREEMENT"). [GNU General Public License V2]
 *
 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
 *
 * You may obtain a copy of the License at
 *
 * https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 *
 * 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.
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this GPL v2 license.
 *
 * The generated images can then be used without any reference to the GPL v2 license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.png;

import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import net.sourceforge.plantuml.file.SuggestedFile;
import net.sourceforge.plantuml.klimt.color.ColorMapper;
import net.sourceforge.plantuml.security.SFile;
import net.sourceforge.plantuml.security.SImageIO;
import net.sourceforge.plantuml.skin.SplitParam;
import net.sourceforge.plantuml.utils.Log;

public class PngSplitter {
	// ::remove file when __CORE__

	private final List files = new ArrayList<>();

	public PngSplitter(ColorMapper colorMapper, SuggestedFile pngFile, int horizontalPages, int verticalPages,
			String metadata, int dpi, SplitParam splitParam) throws IOException {
		if (horizontalPages == 1 && verticalPages == 1) {
			this.files.add(pngFile.getFile(0));
			return;
		}

		Log.info("Splitting " + horizontalPages + " x " + verticalPages);
		final SFile full = pngFile.getTmpFile(); // SecurityUtils.File(pngFile.getParentFile(), pngFile.getName() +
													// ".tmp");
		// Thread.yield();
		full.delete();
		// Thread.yield();
		final boolean ok = pngFile.getFile(0).renameTo(full);
		// Thread.yield();
		if (ok == false) {
			throw new IOException("Cannot rename");
		}

		// Thread.yield();
		final BufferedImage im = SImageIO.read(full);
		// Thread.yield();
		final PngSegment horizontalSegment = new PngSegment(im.getWidth(), horizontalPages);
		final PngSegment verticalSegment = new PngSegment(im.getHeight(), verticalPages);

		int x = 0;
		for (int i = 0; i < horizontalPages; i++) {
			for (int j = 0; j < verticalPages; j++) {
				final SFile f = pngFile.getFile(x++);
				this.files.add(f);
				final int width = horizontalSegment.getLen(i);
				final int height = verticalSegment.getLen(j);
				BufferedImage piece = im.getSubimage(horizontalSegment.getStart(i), verticalSegment.getStart(j), width,
						height);
				if (splitParam.isSet()) {
					BufferedImage withMargin = new BufferedImage(width + 2 * splitParam.getExternalMargin(),
							height + 2 * splitParam.getExternalMargin(), BufferedImage.TYPE_INT_ARGB);
					final Graphics2D g2d = withMargin.createGraphics();
					if (splitParam.getExternalColor() != null) {
						g2d.setColor(splitParam.getExternalColor());
						g2d.fillRect(0, 0, withMargin.getWidth(), withMargin.getHeight());
					}
					g2d.drawImage(piece, splitParam.getExternalMargin(), splitParam.getExternalMargin(), null);

					if (splitParam.getBorderColor() != null) {
						g2d.setColor(splitParam.getBorderColor());
						g2d.drawRect(splitParam.getExternalMargin() - 1, splitParam.getExternalMargin() - 1,
								piece.getWidth() + 1, piece.getHeight() + 1);
					}

					piece = withMargin;

					g2d.dispose();
				}
				// Thread.yield();
				PngIO.write(piece, colorMapper, f, metadata, dpi);
				// Thread.yield();
			}
		}

		full.delete();
		Log.info("End of splitting");
	}

	public List getFiles() {
		return Collections.unmodifiableList(files);
	}

}