image util: add conditional recolorImage method

runelite-client/src/main/java/net/runelite/client/util/ImageUtil.java

@@ -405,6 +405,36 @@ public class ImageUtil
 		return filledImage;
 	}
 
+	/**
+	 * 	Recolors pixels of the given image with the given color based on a given recolor condition
+	 * 	predicate.
+	 *
+	 * @param image            The image which should have its non-transparent pixels recolored.
+	 * @param color            The color with which to recolor pixels.
+	 * @param recolorCondition The condition on which to recolor pixels with the given color.
+	 * @return                 The given image with all pixels fulfilling the recolor condition predicate
+	 *                         set to the given color.
+	 */
+	public static BufferedImage recolorImage(final BufferedImage image, final Color color, final Predicate<Color> recolorCondition)
+	{
+		final BufferedImage recoloredImage = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_ARGB);
+		for (int x = 0; x < recoloredImage.getWidth(); x++)
+		{
+			for (int y = 0; y < recoloredImage.getHeight(); y++)
+			{
+				final Color pixelColor = new Color(image.getRGB(x, y), true);
+				if (!recolorCondition.test(pixelColor))
+				{
+					recoloredImage.setRGB(x, y, image.getRGB(x, y));
+					continue;
+				}
+
+				recoloredImage.setRGB(x, y, color.getRGB());
+			}
+		}
+		return recoloredImage;
+	}
+
 	/**
 	 * Performs a rescale operation on the image's color components.
 	 *