QuantifyPacked28.java

/* ========================================================================
 * PlantUML : a free UML diagram generator
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 * (C) Copyright 2009-2024, Arnaud Roques
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 * Original Author:  Arnaud Roques
 * With assistance from ChatGPT (OpenAI)
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 */
package net.sourceforge.plantuml.png.quant;

import java.awt.image.BufferedImage;

public final class QuantifyPacked28 {

	public static BufferedImage packMeIfPossible(BufferedImage src) {

		final int type = src.getType();

		assert type == BufferedImage.TYPE_INT_ARGB || type == BufferedImage.TYPE_INT_RGB
				|| type == BufferedImage.TYPE_3BYTE_BGR || type == BufferedImage.TYPE_4BYTE_ABGR;

		final int w = src.getWidth();
		final int h = src.getHeight();

		try {
			final BufferedImage dst = new BufferedImage(w, h, type);

			final int[] pixels = src.getRGB(0, 0, w, h, null, 0, w);
			final int[] out = new int[pixels.length];

			for (int i = 0; i < pixels.length; i++) {
				final int argb = pixels[i];
				out[i] = QuantUtils.compressPackedARGB(argb);
			}

			dst.setRGB(0, 0, w, h, out, 0, w);
			return dst;
		} catch (Throwable t) {
			// Swallowing all throwables is intentional here: any unexpected failure
			// during pixel extraction or packing (including OutOfMemoryError or JVM-level
			// errors) prevents safe recovery. Returning null signals that the packed
			// representation could not be produced.
			return null;
		}
	}

}