Cache skin image data

src/main/java/me/braydon/mc/common/ImageUtils.java

@@ -24,11 +24,14 @@
 package me.braydon.mc.common;
 
 import lombok.NonNull;
+import lombok.SneakyThrows;
 import lombok.experimental.UtilityClass;
 
+import javax.imageio.ImageIO;
 import java.awt.*;
 import java.awt.geom.AffineTransform;
 import java.awt.image.BufferedImage;
+import java.io.ByteArrayOutputStream;
 
 /**
  * @author Braydon
@@ -65,4 +68,19 @@ public final class ImageUtils {
         graphics.dispose();
         return flipped;
     }
+
+    /**
+     * Get the byte array from the given image.
+     *
+     * @param image the image to extract from
+     * @return the byte array of the image
+     */
+    @SneakyThrows
+    public static byte[] toByteArray(@NonNull BufferedImage image) {
+        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
+            ImageIO.write(image, "png", outputStream);
+            outputStream.flush();
+            return outputStream.toByteArray();
+        }
+    }
 }

src/main/java/me/braydon/mc/common/renderer/SkinRenderer.java

@@ -32,7 +32,7 @@ import me.braydon.mc.model.skin.Skin;
 import javax.imageio.ImageIO;
 import java.awt.*;
 import java.awt.image.BufferedImage;
-import java.net.URL;
+import java.io.ByteArrayInputStream;
 
 /**
  * A renderer for a {@link ISkinPart}.
@@ -63,17 +63,17 @@ public abstract class SkinRenderer<T extends ISkinPart> {
      */
     @SneakyThrows
     protected final BufferedImage getVanillaSkinPart(@NonNull Skin skin, @NonNull ISkinPart.Vanilla part, double size) {
-        BufferedImage skinImage = ImageIO.read(new URL(skin.getUrl())); // The skin texture
         ISkinPart.Vanilla.Coordinates coordinates = part.getCoordinates(); // The coordinates of the part
 
         // The skin texture is legacy, use legacy coordinates
-        if (skinImage.getHeight() == 32 && part.hasLegacyCoordinates()) {
+        if (skin.isLegacy() && part.hasLegacyCoordinates()) {
             coordinates = part.getLegacyCoordinates();
         }
         int width = part.getWidth(); // The width of the part
         if (skin.getModel() == Skin.Model.SLIM && part.isFrontArm()) {
             width--;
         }
+        BufferedImage skinImage = ImageIO.read(new ByteArrayInputStream(skin.getSkinImage())); // The skin texture
         BufferedImage partTexture = getSkinPartTexture(skinImage, coordinates.getX(), coordinates.getY(), width, part.getHeight(), size);
         if (coordinates instanceof ISkinPart.Vanilla.LegacyCoordinates legacyCoordinates && legacyCoordinates.isFlipped()) {
             partTexture = ImageUtils.flip(partTexture);

src/main/java/me/braydon/mc/model/skin/Skin.java

@@ -23,12 +23,17 @@
  */
 package me.braydon.mc.model.skin;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.google.gson.JsonObject;
 import lombok.*;
+import me.braydon.mc.common.ImageUtils;
 import me.braydon.mc.config.AppConfig;
 import me.braydon.mc.model.Player;
 
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.net.URL;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -37,9 +42,9 @@ import java.util.Map;
  *
  * @author Braydon
  */
-@RequiredArgsConstructor(access = AccessLevel.PRIVATE) @Setter @Getter @ToString
+@AllArgsConstructor(access = AccessLevel.PRIVATE) @Getter @ToString
 public final class Skin {
-    public static final Skin DEFAULT_STEVE = new Skin("http://textures.minecraft.net/texture/60a5bd016b3c9a1b9272e4929e30827a67be4ebb219017adbbc4a4d22ebd5b1", Model.DEFAULT);
+    public static final Skin DEFAULT_STEVE = create("http://textures.minecraft.net/texture/60a5bd016b3c9a1b9272e4929e30827a67be4ebb219017adbbc4a4d22ebd5b1", Model.DEFAULT);
 
     /**
      * The texture URL of this skin.
@@ -51,10 +56,20 @@ public final class Skin {
      */
     @NonNull private final Model model;
 
+    /**
+     * The image data of this skin.
+     */
+    @JsonIgnore private final byte[] skinImage;
+
+    /**
+     * Is this skin legacy?
+     */
+    private final boolean legacy;
+
     /**
      * URLs to the parts of this skin.
      */
-    @NonNull @JsonProperty("parts") private Map<String, String> partUrls = new HashMap<>();
+    @NonNull @JsonProperty("parts") private final Map<String, String> partUrls;
 
     /**
      * Populate the part URLs for this skin.
@@ -88,7 +103,22 @@ public final class Skin {
         if (metadataJsonObject != null) { // Parse the skin model
             model = Model.valueOf(metadataJsonObject.get("model").getAsString().toUpperCase());
         }
-        return new Skin(jsonObject.get("url").getAsString(), model);
+        return create(jsonObject.get("url").getAsString(), model);
+    }
+
+    /**
+     * Create a skin from the given URL and model.
+     *
+     * @param url the skin url
+     * @param model the skin model
+     * @return the constructed skin
+     */
+    @NonNull @SneakyThrows
+    private static Skin create(@NonNull String url, @NonNull Model model) {
+        BufferedImage image = ImageIO.read(new URL(url)); // Get the skin image
+        byte[] bytes = ImageUtils.toByteArray(image); // Convert the image into bytes
+        boolean legacy = image.getWidth() == 64 && image.getHeight() == 32; // Is the skin legacy?
+        return new Skin(url, model, bytes, legacy, new HashMap<>());
     }
 
     /**

src/main/java/me/braydon/mc/service/MojangService.java

@@ -61,9 +61,7 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpMethod;
 import org.springframework.stereotype.Service;
 
-import javax.imageio.ImageIO;
 import java.awt.image.BufferedImage;
-import java.io.ByteArrayOutputStream;
 import java.io.InputStream;
 import java.net.InetSocketAddress;
 import java.net.URL;
@@ -231,16 +229,10 @@ public final class MojangService {
         BufferedImage texture = part.render(skin, overlays, size); // Render the skin part
         log.info("Render of skin part took {}ms: {}", System.currentTimeMillis() - before, id);
 
-        // Convert BufferedImage to byte array
-        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
-            ImageIO.write(texture, "png", outputStream);
-            outputStream.flush();
-
-            byte[] bytes = outputStream.toByteArray();
-            skinPartTextureCache.save(new CachedSkinPartTexture(id, bytes)); // Cache the texture
-            log.info("Cached skin part texture: {}", id);
-            return bytes;
-        }
+        byte[] bytes = ImageUtils.toByteArray(texture); // Convert the image into a byte array
+        skinPartTextureCache.save(new CachedSkinPartTexture(id, bytes)); // Cache the texture
+        log.info("Cached skin part texture: {}", id);
+        return bytes;
     }
 
     /**