Add Forge 1.20.1 HD 3D Skin Layers compatibility

common/src/main/java/xyz/nightsync/skinsg/mixin/SkinMagicMixin.java

@@ -2,6 +2,10 @@ package xyz.nightsync.skinsg.mixin;
 
 import com.mojang.blaze3d.platform.NativeImage;
 import net.minecraft.client.renderer.texture.HttpTexture;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.resources.DefaultPlayerSkin;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 import org.jetbrains.annotations.Nullable;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Shadow;
@@ -18,6 +22,7 @@ import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
  */
 @Mixin(HttpTexture.class)
 public abstract class SkinMagicMixin {
+    private static final Logger SKINSG_LOGGER = LoggerFactory.getLogger("skinsg");
 
     @Shadow
     private static void setNoAlpha(NativeImage img, int x1, int y1, int x2, int y2) {}
@@ -27,8 +32,9 @@ public abstract class SkinMagicMixin {
 
     @Inject(method = "processLegacySkin", at = @At("HEAD"), cancellable = true)
     private void skinsg$processLegacySkin(NativeImage image, CallbackInfoReturnable<@Nullable NativeImage> cir) {
-        final int h = image.getHeight();
-        final int w = image.getWidth();
+        try {
+            final int h = image.getHeight();
+            final int w = image.getWidth();
 
         final int s   = w / 8;
         final int x64 = s * 8;
@@ -80,5 +86,28 @@ public abstract class SkinMagicMixin {
 
         cir.setReturnValue(image);
         cir.cancel();
+        } catch (Exception | LinkageError error) {
+            SKINSG_LOGGER.error("[SkinsG] Failed to process skin image; falling back to the default Steve skin.", error);
+            try {
+                image.close();
+            } catch (RuntimeException closeError) {
+                SKINSG_LOGGER.debug("[SkinsG] Failed to close rejected skin image.", closeError);
+            }
+            cir.setReturnValue(skinsg$loadSteve());
+            cir.cancel();
+        }
+    }
+
+    private static NativeImage skinsg$loadSteve() {
+        try {
+            var resource = Minecraft.getInstance().getResourceManager()
+                    .getResource(DefaultPlayerSkin.getDefaultSkin()).orElseThrow();
+            try (var stream = resource.open()) {
+                return NativeImage.read(stream);
+            }
+        } catch (Exception | LinkageError fallbackError) {
+            SKINSG_LOGGER.error("[SkinsG] Default Steve skin could not be loaded; vanilla will use its fallback.", fallbackError);
+            return null;
+        }
     }
 }