FutureBufferedImage.java

/* ========================================================================
 * 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:
 * 
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 * 
 * This file is part of PlantUML.
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU 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 General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 *
 *
 * Original Author:  Arnaud Roques
 * 
 *
 */
package net.sourceforge.plantuml.preproc;

import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UncheckedIOException;
import java.util.List;

public class FutureBufferedImage {

	private final int width;
	private final int height;
	private final List<Integer> colors;
	private byte[] data;
	private BufferedImage image;

	public FutureBufferedImage(List<Integer> colors, int width, int height, byte[] data) {
		this.colors = colors;
		this.width = width;
		this.height = height;
		this.data = data;
	}

	public BufferedImage getNow() {
		synchronized (this) {
			if (image == null) {
				image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);

				try (InputStream is = new ByteArrayInputStream(data)) {
					for (int y = 0; y < height; y++)
						for (int x = 0; x < width; x++) {
							final int rgb = colors.get(Stdlib.read2bytes(is));
							image.setRGB(x, y, rgb);
						}
				} catch (IOException e) {
					throw new UncheckedIOException(e);
				}
				data = null; // free memory
			}

		}
		return image;
	}

}