fix(measure): show masked calibration preview

2026-09-26 08:38:17 -07:00
parent 0dd5d255ec
commit 89bc7d4ee9
3 changed files with 116 additions and 10 deletions
@@ -0,0 +1,14 @@
+import { test } from 'node:test';
+import assert from 'node:assert/strict';
+import { applyMaskAlpha } from './maskedPreview';
+
+test('applyMaskAlpha keeps slab pixels and clears the background', () => {
+  const rgba = new Uint8ClampedArray([
+    1, 2, 3, 255,
+    4, 5, 6, 255,
+    7, 8, 9, 255,
+  ]);
+  const out = applyMaskAlpha(rgba, new Uint8Array([1, 0]));
+  assert.deepEqual([...out], [1, 2, 3, 255, 4, 5, 6, 0, 7, 8, 9, 0]);
+  assert.deepEqual([...rgba], [1, 2, 3, 255, 4, 5, 6, 255, 7, 8, 9, 255]);
+});