rework: improve the accuracy of skin type determination

* Move code (icu.puqns67.skintypefix.mixin.accessor => icu.puqns67.skintypefix.accessor,
    icu.puqns67.skintypefix.mixin.patch => icu.puqns67.skintypefix.mixin).
* Fix the start and end points of the square may be in the wrong order.
* Update the format of log messages.

Author: Puqns67

Diff for: src/main/java/icu/puqns67/skintypefix/mixin/accessor/HttpTextureAccessor.java renamed to src/main/java/icu/puqns67/skintypefix/accessor/HttpTextureAccessor.java

@@ -1,4 +1,4 @@
-package icu.puqns67.skintypefix.mixin.accessor;
+package icu.puqns67.skintypefix.accessor;
 
 import com.mojang.blaze3d.platform.NativeImage;
 

Diff for: src/main/java/icu/puqns67/skintypefix/mixin/patch/HttpTextureMixin.java renamed to src/main/java/icu/puqns67/skintypefix/mixin/HttpTextureMixin.java

@@ -1,7 +1,7 @@
-package icu.puqns67.skintypefix.mixin.patch;
+package icu.puqns67.skintypefix.mixin;
 
 import com.mojang.blaze3d.platform.NativeImage;
-import icu.puqns67.skintypefix.mixin.accessor.HttpTextureAccessor;
+import icu.puqns67.skintypefix.accessor.HttpTextureAccessor;
 import net.fabricmc.api.EnvType;
 import net.fabricmc.api.Environment;
 import net.minecraft.client.renderer.texture.HttpTexture;
@@ -22,7 +22,7 @@ public abstract class HttpTextureMixin extends SimpleTexture implements HttpText
 	private static Logger LOGGER;
 	@Unique
 	@Nullable
-	protected NativeImage image = null;
+	protected NativeImage skinTypeFix$image = null;
 	@Shadow
 	@Nullable
 	private CompletableFuture<?> future;
@@ -46,27 +46,26 @@ public HttpTextureMixin(ResourceLocation location) {
 	}
 
 	@Unique
+	@Nullable
 	public NativeImage skinTypeFix$getImage() {
-		return this.image;
+		return this.skinTypeFix$image;
 	}
 
 	/**
 	 * @author Puqns67
 	 * @reason Overwrite the load() function to create another NativeImage at loading, using for check skin.
 	 */
-	@Nullable
 	@Overwrite
+	@Nullable
 	private NativeImage load(InputStream stream) {
 		try {
 			var result = NativeImage.read(stream);
 			if (this.processLegacySkin) {
-				result = this.processLegacySkin(result);
-
 				// If this.processLegacySkin is true, the image is the player's skin, so a backup needs to be created for check
-				if (result != null) {
-					this.image = new NativeImage(64, 64, true);
-					this.image.copyFrom(result);
-				}
+				this.skinTypeFix$image = new NativeImage(64, 64, true);
+				this.skinTypeFix$image.copyFrom(result);
+
+				result = this.processLegacySkin(result);
 			}
 			return result;
 		} catch (Exception e) {

Diff for: src/main/java/icu/puqns67/skintypefix/mixin/patch/SkinManagerMixin.java renamed to src/main/java/icu/puqns67/skintypefix/mixin/SkinManagerMixin.java

@@ -1,12 +1,12 @@
-package icu.puqns67.skintypefix.mixin.patch;
+package icu.puqns67.skintypefix.mixin;
 
 import com.llamalad7.mixinextras.sugar.Local;
 import com.mojang.authlib.SignatureState;
 import com.mojang.authlib.minecraft.MinecraftProfileTexture;
 import com.mojang.authlib.minecraft.MinecraftProfileTextures;
 import com.mojang.authlib.minecraft.MinecraftSessionService;
 import icu.puqns67.skintypefix.SkinTypeFix;
-import icu.puqns67.skintypefix.mixin.accessor.HttpTextureAccessor;
+import icu.puqns67.skintypefix.accessor.HttpTextureAccessor;
 import icu.puqns67.skintypefix.util.Utils;
 import icu.puqns67.skintypefix.util.image.Places;
 import net.fabricmc.api.EnvType;
@@ -75,14 +75,14 @@ private void onRegisterTextures(
 			// Get image from PlayerSkinTexture
 			var skinImage = skinTexture.skinTypeFix$getImage();
 			if (skinImage == null) {
-				SkinTypeFix.LOGGER.warn("[SkinTypeFix] [{}] {GET_IMAGE} An error occurred while getting image!", uuid);
+				SkinTypeFix.LOGGER.warn("[SkinTypeFix] [{}] Unable to get image!", uuid);
 				return skinModelOrigin;
 			}
 
 			// Check skin type
 			var needFix = switch (skinModelOrigin) {
-				case SLIM -> !Places.PLAYER.isAllBlack(skinImage);
-				case WIDE -> Places.PLAYER.isAllBlack(skinImage);
+				case SLIM -> !Places.DIFF_PLAYER_SKIN.hasTransparent(skinImage);
+				case WIDE -> Places.DIFF_PLAYER_SKIN.hasTransparent(skinImage);
 			};
 
 			if (needFix) {

Diff for: src/main/java/icu/puqns67/skintypefix/util/image/Places.java

@@ -5,13 +5,13 @@
 import java.util.ArrayList;
 
 public class Places {
-	public static final Places PLAYER = Places.forPlayer();
+	public static final Places DIFF_PLAYER_SKIN = Places.diffPlayerSkin();
 	private final ArrayList<Square> squares = new ArrayList<>();
 
 	public Places() {
 	}
 
-	public static Places forPlayer() {
+	public static Places diffPlayerSkin() {
 		var result = new Places();
 		result.add(50, 16, 51, 19);
 		result.add(50, 16, 51, 19);
@@ -29,9 +29,9 @@ public void add(int x1, int y1, int x2, int y2) {
 		this.add(new Square(x1, y1, x2, y2));
 	}
 
-	public boolean isAllBlack(NativeImage image) {
+	public boolean hasTransparent(NativeImage image) {
 		for (var square : this.squares) {
-			if (!square.isAllBlack(image)) {
+			if (!square.hasTransparent(image)) {
 				return false;
 			}
 		}

Diff for: src/main/java/icu/puqns67/skintypefix/util/image/Point.java

@@ -9,7 +9,7 @@ public record Point(int x, int y) {
 		}
 	}
 
-	public boolean isBlack(NativeImage image) {
-		return image.getPixelRGBA(x, y) == 0xff000000;
+	public boolean isTransparent(NativeImage image) {
+		return image.getPixelRGBA(x, y) >>> 24 != 0xff;
 	}
 }

Diff for: src/main/java/icu/puqns67/skintypefix/util/image/Square.java

@@ -6,8 +6,8 @@
 
 public record Square(Point p1, Point p2) {
 	public Square {
-		// The point close to (0,0) is p1
-		if (p2.x() < p1.x() || p1.x() == p2.x() && p2.y() < p1.y()) {
+		// The point close to (0, 0) is p1, if the order is not correct then reverse them
+		if (p2.x() < p1.x() || (p2.x() == p1.x() && p2.y() < p1.y())) {
 			var tmp = p1;
 			p1 = p2;
 			p2 = tmp;
@@ -28,9 +28,9 @@ public ArrayList<Point> points() {
 		return result;
 	}
 
-	public boolean isAllBlack(NativeImage image) {
+	public boolean hasTransparent(NativeImage image) {
 		for (var point : this.points()) {
-			if (!point.isBlack(image)) {
+			if (!point.isTransparent(image)) {
 				return false;
 			}
 		}

Diff for: src/main/resources/skintypefix.mixins.json

@@ -1,5 +1,5 @@
 {
-	"package": "icu.puqns67.skintypefix.mixin.patch",
+	"package": "icu.puqns67.skintypefix.mixin",
 	"client": [
 		"HttpTextureMixin",
 		"SkinManagerMixin"