feat(scripts): computeLpos / computeContentSize - 锚点转换公式（实测验证）

cocoscreator_projects/framework-tests/legacy-layer-migration/coord-calculator.test.mjs

@@ -0,0 +1,50 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { computeLpos, computeContentSize } from '../../scripts/legacy-layer-to-cocos-prefab.mjs';
+
+test('computeLpos 锚点转换（实测验证：渠道logo）', () => {
+  const spirit = { x: '734', y: '143', w: '59', h: '148' };
+  const lpos = computeLpos(spirit);
+  // x = 734 + 59/2 - 640 = 123.5
+  // y = 360 - (143 + 148/2) = 143
+  assert.equal(lpos.x, 123.5);
+  assert.equal(lpos.y, 143);
+  assert.equal(lpos.z, 0);
+});
+
+test('computeLpos 锚点转换（实测验证：游客登录）', () => {
+  const spirit = { x: '540', y: '388', w: '320', h: '95' };
+  const lpos = computeLpos(spirit);
+  // x = 540 + 160 - 640 = 60
+  // y = 360 - (388 + 47.5) = -75.5
+  assert.equal(lpos.x, 60);
+  assert.equal(lpos.y, -75.5);
+});
+
+test('computeLpos 字符串转数字（X/Y 为字符串 "0"/"-100"）', () => {
+  const spirit = { x: '0', y: '-100', w: '100', h: '100' };
+  const lpos = computeLpos(spirit);
+  // x = 0 + 50 - 640 = -590
+  // y = 360 - (-100 + 50) = 410
+  assert.equal(lpos.x, -590);
+  assert.equal(lpos.y, 410);
+});
+
+test('computeContentSize 直接读 Width/Height（SizeCalcMode=0 路径）', () => {
+  const spirit = { w: '320', h: '95', sizeCalcMode: '0' };
+  const size = computeContentSize(spirit);
+  assert.equal(size.width, 320);
+  assert.equal(size.height, 95);
+});
+
+test('computeContentSize 默认 SizeCalcMode=0（字段缺失视作 0）', () => {
+  const spirit = { w: '100', h: '50' }; // no sizeCalcMode
+  const size = computeContentSize(spirit);
+  assert.equal(size.width, 100);
+  assert.equal(size.height, 50);
+});
+
+test('computeContentSize SizeCalcMode=1 → throw（不静默）', () => {
+  const spirit = { w: '100', h: '50', sizeCalcMode: '1' };
+  assert.throws(() => computeContentSize(spirit), /SizeCalcMode=1.*reverse gameabc\.min\.js/);
+});

cocoscreator_projects/scripts/legacy-layer-to-cocos-prefab.mjs

@@ -53,3 +53,46 @@ export function readLayerXml(path) {
 
   return { layerId, layerName, spirits };
 }
+
+/**
+ * 锚点转换: 原坐标系 (left-top, 1280×720 绝对) → Cocos 中心锚点 + Y-up.
+ *
+ * 公式 (实测验证 2026-09-02, Login_Layer 渠道logo + 游客登录双节点 _lpos 匹配):
+ *   cocos_lpos.x = original_X + original_W/2 - 640    # 1280/2
+ *   cocos_lpos.y = 360 - (original_Y + original_H/2)   # Y-up 翻转 + 720/2
+ *
+ * @param {{ x?: string, y?: string, w?: string, h?: string }} spirit
+ * @returns {{ x: number, y: number, z: 0 }}
+ */
+export function computeLpos(spirit) {
+  const x = parseFloat(spirit.x || '0');
+  const y = parseFloat(spirit.y || '0');
+  const w = parseFloat(spirit.w || '0');
+  const h = parseFloat(spirit.h || '0');
+  // 锚点转换：原 X/Y 是左上角（1280×720 绝对坐标）→ Cocos 中心锚点
+  return {
+    x: x + w / 2 - 640,            // 原坐标系半宽 1280/2
+    y: 360 - (y + h / 2),          // Y-up 翻转 + 半高 720/2
+    z: 0,
+  };
+}
+
+/**
+ * 计算 Spirit 的 contentSize (Cocos UI 节点尺寸).
+ *
+ * 数据源权威: SizeCalcMode 缺失视作 0 (直接读 Width/Height); 非 0 抛错,
+ * 由上游显式决定是否逆向 gameabc.min.js (Task 5 范围, 本任务不支持).
+ *
+ * @param {{ w?: string, h?: string, sizeCalcMode?: string, id?: string, name?: string }} spirit
+ * @returns {{ width: number, height: number }}
+ */
+export function computeContentSize(spirit) {
+  const sizeCalcMode = parseInt(spirit.sizeCalcMode || '0', 10);
+  if (sizeCalcMode !== 0) {
+    throw new Error(`SizeCalcMode=${sizeCalcMode} not yet supported for Spirit ${spirit.id} (${spirit.name}) - reverse gameabc.min.js first (Task 5)`);
+  }
+  return {
+    width: parseFloat(spirit.w || '0'),
+    height: parseFloat(spirit.h || '0'),
+  };
+}