implement ignoring fully transparent sprites

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

@@ -0,0 +1,34 @@
+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;
+	}
+}