ATCS/src/com/gpl/rpg/atcontentstudio/utils/SpriteUtils.java

package com.gpl.rpg.atcontentstudio.utils;

import java.awt.image.BufferedImage;
import java.awt.image.WritableRaster;

public final class SpriteUtils {

	/**
	 * Check if the image is empty (transparent )
	 *
	 * @param img The image to check
	 * @return true if the image is empty
	 */
	public static boolean checkIsImageEmpty(BufferedImage img) {
		int width = img.getWidth(null);
		int height = img.getHeight(null);
		WritableRaster raster = img.getAlphaRaster();
		if (raster == null) {
			return false;
		}
		for (int x = 0; x < width; x++) {
			for (int y = 0; y < height; y++) {
				//get pixel alpha value
				int alpha = raster.getSample(x, y, 0);
				//if alpha is not 0 then the pixel is not transparent
				if (alpha != 0) {
					return false;
				}
			}
		}
		//no non-transparent pixel found
		return true;
	}
}