make the skin renderer less bad (thanks bray)

src/main/java/cc/fascinated/common/ImageUtils.java

@@ -0,0 +1,58 @@
+package cc.fascinated.common;
+
+import jakarta.validation.constraints.NotNull;
+import lombok.SneakyThrows;
+import lombok.extern.log4j.Log4j2;
+
+import javax.imageio.ImageIO;
+import java.awt.*;
+import java.awt.geom.AffineTransform;
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+
+@Log4j2
+public class ImageUtils {
+    /**
+     * Scale the given image to the provided size.
+     *
+     * @param image the image to scale
+     * @param size  the size to scale the image to
+     * @return the scaled image
+     */
+    public static BufferedImage resize(BufferedImage image, double size) {
+        BufferedImage scaled = new BufferedImage((int) (image.getWidth() * size), (int) (image.getHeight() * size), BufferedImage.TYPE_INT_ARGB);
+        Graphics2D graphics = scaled.createGraphics();
+        graphics.drawImage(image, AffineTransform.getScaleInstance(size, size), null);
+        graphics.dispose();
+        return scaled;
+    }
+
+    /**
+     * Flip the given image.
+     *
+     * @param image the image to flip
+     * @return the flipped image
+     */
+    public static BufferedImage flip(@NotNull final BufferedImage image) {
+        BufferedImage flipped = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_ARGB);
+        Graphics2D graphics = flipped.createGraphics();
+        graphics.drawImage(image, image.getWidth(), 0, 0, image.getHeight(), 0, 0, image.getWidth(), image.getHeight(), null);
+        graphics.dispose();
+        return flipped;
+    }
+
+    /**
+     * Convert an image to bytes.
+     *
+     * @param image the image to convert
+     * @return the image as bytes
+     */
+    @SneakyThrows
+    public static byte[] imageToBytes(BufferedImage image) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
+            ImageIO.write(image, "png", outputStream);
+            return outputStream.toByteArray();
+        }
+    }
+}