From 92cfc3c1d3e187677235bab53cf7d7063509bcd2 Mon Sep 17 00:00:00 2001
From: andylizi <andylizi@qq.com>
Date: Mon, 24 Sep 2018 13:47:59 +0800
Subject: [PATCH] Make skin preview more accurate

---
 .../jackhuang/hmcl/game/AccountHelper.java    | 50 ++++---------------
 1 file changed, 9 insertions(+), 41 deletions(-)

diff --git a/HMCL/src/main/java/org/jackhuang/hmcl/game/AccountHelper.java b/HMCL/src/main/java/org/jackhuang/hmcl/game/AccountHelper.java
index 29d65925b..751e1ba78 100644
--- a/HMCL/src/main/java/org/jackhuang/hmcl/game/AccountHelper.java
+++ b/HMCL/src/main/java/org/jackhuang/hmcl/game/AccountHelper.java
@@ -32,6 +32,7 @@ import org.jackhuang.hmcl.task.Task;
 import org.jackhuang.hmcl.ui.DialogController;
 import org.jackhuang.hmcl.util.io.NetworkUtils;
 
+import java.awt.Graphics2D;
 import java.awt.image.BufferedImage;
 import java.io.File;
 import java.util.*;
@@ -93,53 +94,20 @@ public final class AccountHelper {
     }
 
     public static Image getHead(Image skin, int scaleRatio) {
-        int size = 8 * scaleRatio;
+        final int size = 8 * scaleRatio;
+        final int faceOffset = (int) Math.ceil(0.25 * scaleRatio);
         BufferedImage image = SwingFXUtils.fromFXImage(skin, null);
-        BufferedImage head = image.getSubimage(size, size, size, size);
+        BufferedImage head = new BufferedImage(size, size, BufferedImage.TYPE_INT_ARGB);
+        Graphics2D g2d = head.createGraphics();
+        g2d.drawImage(image, faceOffset, faceOffset, size - faceOffset, size - faceOffset,
+                size, size, size + size, size + size, null);
         if (image.getHeight() > 32) {
-            int[] face = head.getRGB(0, 0, size, size, null, 0, size);
-            int[] helmet = image.getRGB(40 * scaleRatio, 8 * scaleRatio, size, size, null, 0, size);
-            int[] result = blendColor(face, helmet);
-            head.setRGB(0, 0, size, size, result, 0, size);
+            g2d.drawImage(image, 0, 0, size, size,
+                    40 * scaleRatio, 8 * scaleRatio, 48 * scaleRatio, 16 * scaleRatio, null);
         }
         return SwingFXUtils.toFXImage(head, null);
     }
 
-    private static int[] blendColor(int[] bottom, int[] top) {
-        if (bottom.length != top.length) throw new IllegalArgumentException();
-        int[] result = new int[bottom.length];
-        for (int i = 0; i < bottom.length; i++) {
-            int b = bottom[i];
-            int t = top[i];
-            result[i] = blendColor(b, t);
-        }
-        return result;
-    }
-
-    private static int blendColor(int bottom, int top) {
-        int tAlpha = (top >> 24) & 0xFF;
-        if (tAlpha == 0) return bottom | 0xFF000000;  // set alpha to 255
-        if (tAlpha == 255) return top;
-
-        int tRed = (top >> 16) & 0xFF,
-                tGreen = (top >> 8) & 0xFF,
-                tBlue = (top) & 0xFF;
-        int bRed = (bottom >> 16) & 0xFF,
-                bGreen = (bottom >> 8) & 0xFF,
-                bBlue = (bottom) & 0xFF;
-        int cRed = blendColorChannel(bRed, tRed, tAlpha),
-                cGreen = blendColorChannel(bGreen, tGreen, tAlpha),
-                cBlue = blendColorChannel(bBlue, tBlue, tAlpha);
-        return 0xFF000000 |  // set alpha to 255
-                ((cRed & 0xFF) << 16) |
-                ((cGreen & 0xFF) << 8) |
-                ((cBlue & 0xFF));
-    }
-
-    private static int blendColorChannel(int bottom, int top, int alpha) {
-        return (top * alpha + bottom * (255 - alpha)) / 255;
-    }
-
     private static class SkinLoadTask extends Task {
         private final YggdrasilAccount account;
         private final boolean refresh;