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tests/visible-bounds.test.js

@@ -0,0 +1,19 @@
+'use strict';
+
+const assert = require('node:assert/strict');
+const { findAlphaBounds, toWorldBounds } = require('../js/spine-visible-bounds');
+
+const pixels = new Uint8Array(10 * 8 * 4);
+for (let y = 2; y < 6; y++) {
+	for (let x = 3; x < 8; x++) pixels[(y * 10 + x) * 4 + 3] = 255;
+}
+assert.deepEqual(findAlphaBounds(pixels, 10, 8), { left: 3, top: 2, right: 8, bottom: 6 });
+assert.deepEqual(toWorldBounds({ left: 3, top: 2, right: 8, bottom: 6 }, 10, 8, 2, 20, 30), {
+	x: 19,
+	y: 29,
+	width: 2.5,
+	height: 2,
+});
+assert.equal(findAlphaBounds(new Uint8Array(10 * 8 * 4), 10, 8), null);
+
+console.log('PASS: visible alpha pixels map back to the correct Spine world bounds');