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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 Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see .
 *
 * 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 LGPL license.
 *
 * The generated images can then be used without any reference to the LGPL 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.fun;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import net.sourceforge.plantuml.log.Logme;
import net.sourceforge.plantuml.security.SImageIO;

public class IconLoader {
    // ::remove folder when __HAXE__

	private static final int NUMBER_OF_ICONS = 31;

	private final static Map all = new ConcurrentHashMap();
	static private final List tmp = new ArrayList<>();

	public static BufferedImage getRandom() {
		// return addTransparent(getIcon("sprite029.png"));
		return addTransparent(getIcon(getSomeQuote()));
	}

	private static String getSomeQuote() {
		synchronized (tmp) {
			if (tmp.size() == 0) {
				for (int i = 0; i < NUMBER_OF_ICONS; i++)
					tmp.add("sprite" + String.format("%03d", i) + ".png");

				Collections.shuffle(tmp);
			}
			final int size = tmp.size();
			final String result = tmp.get(size - 1);
			tmp.remove(size - 1);
			return result;
		}
	}

	private static BufferedImage getIcon(String name) {
		BufferedImage result = all.get(name);
		if (result == null) {
			result = getIconSlow(name);
			if (result != null)
				all.put(name, result);

		}
		return result;
	}

	private static BufferedImage getIconSlow(String name) {
		try {
			final InputStream is = IconLoader.class.getResourceAsStream(name);
			if (is == null)
				return null;

			final BufferedImage image = SImageIO.read(is);
			is.close();
			return image;
		} catch (IOException e) {
			Logme.error(e);
		}
		return null;
	}

	private static BufferedImage addTransparent(BufferedImage ico) {
		if (ico == null)
			return null;

		final BufferedImage transparentIcon = new BufferedImage(ico.getWidth(), ico.getHeight(),
				BufferedImage.TYPE_INT_ARGB_PRE);
		for (int i = 0; i < ico.getWidth(); i++)
			for (int j = 0; j < ico.getHeight(); j++) {
				final int col = ico.getRGB(i, j);
				if (col != ico.getRGB(0, 0))
					transparentIcon.setRGB(i, j, col);
			}

		return transparentIcon;
	}

}