fix(发际线): 修正不对称刘海导致的模板叠加倾斜

按 MediaPipe 左右对应额头点协调模板延伸距离，保留人脸姿态与头部轮廓钳制，统一预览白线和生发遮罩的几何。补充对齐回归测试并更新贴图顺序测试及实现说明。验证：13 项相关测试通过；两张用户图片完成前后对比，新图男性 7 型接口与生发图均成功返回。
2026-11-01 15:14:29 +08:00
parent 8554850d55
commit a3fddbbc34
6 changed files with 145 additions and 6 deletions
@@ -20,6 +20,13 @@ MP_TOP_ANCHORS: list[int] = [
 ]
 N_ANCHORS = len(MP_TOP_ANCHORS)  # 17

+# Anatomical left/right pairs, in MediaPipe indices. The anchor list is
+# NOT mirror-ordered at its ends: 127 pairs with 356, 234 with 454.
+MP_TOP_ANCHOR_PAIRS = [
+    (127, 356), (234, 454), (162, 389), (21, 251),
+    (54, 284), (103, 332), (67, 297), (109, 338),
+]
+
 # Vertex ID layout in the extended array of length 468 + 2*N_ANCHORS.
 #   [0       .. 468)         : MediaPipe canonical landmarks
 #   [468     .. 468+N)       : middle row (between MP boundary and hairline)