优化缩略图

tests/apng-thumbnail.test.js

@@ -74,6 +74,21 @@ assert.deepEqual(
 	profilesModule.animatedProfiles(profilesModule.DEFAULT_PRIORITY),
 );
 
+// 插值路径供按目标体积定位使用：比锚点更密，首尾与锚点一致。
+// 配置允许分段（分辨率优先就是「400 系列 + 200 系列」），所以不要求整条路径单调。
+for (const name of Object.keys(priorities)) {
+	const anchors = profilesModule.animatedProfiles(name);
+	const path = profilesModule.expandAnimatedPath(name);
+	assert.ok(path.length > anchors.length, name + ' 插值后应比锚点更密');
+	assert.deepEqual(path[0], anchors[0], name + ' 路径首点必须等于首个锚点');
+	assert.deepEqual(path[path.length - 1], anchors[anchors.length - 1], name + ' 路径末点必须等于末尾锚点');
+	for (const profile of path) {
+		assert.ok(profile.size >= 1 && profile.size <= 400, name + ' 插值分辨率必须落在 1-400');
+		assert.ok(profile.fps >= 1, name + ' 插值帧率至少为 1');
+		assert.ok(profile.quality > 0 && profile.quality <= 1, name + ' 插值质量必须落在 (0,1]');
+	}
+}
+
 for (const root of ['.', 'release/UNIVERSAL_SpineViewer']) {
 	const html = fs.readFileSync(root + '/viewer/spine.html', 'utf8');
 	const css = fs.readFileSync(root + '/viewer/spine.css', 'utf8');
@@ -89,7 +104,14 @@ for (const root of ['.', 'release/UNIVERSAL_SpineViewer']) {
 	assert.match(script, /const targetBytes = options\.maxKilobytes \* 1024/);
 	// 档位表来自独立配置文件，三种优先级都走画廊手动挑，不会自动应用。
 	assert.match(script, /require\('\.\.\/js\/animated-profiles\.js'\)/);
-	assert.match(script, /const profiles = animatedProfiles\(options\.priority\)/);
+	// 候选先估算整条路径的体积，再按「目标 0.5× ~ 2× 对数间隔」挑，覆盖面比挤在目标附近更宽。
+	assert.match(script, /animatedProfileConfig\.expandAnimatedPath\(options\.priority\)/);
+	assert.match(script, /pickAnimatedCandidates\(\s*searchPath, sourceFrames, size, range, options, targetBytes, candidateCount, encodeFrame,?\s*\)/);
+	assert.match(script, /const low = Math\.log\(Math\.max\(samples\[0\]\.bytes, targetBytes \* 0\.5\)\)/);
+	assert.match(script, /const wanted = Math\.exp\(low \+ \(high - low\) \* slot \/ span\)/);
+	assert.match(script, /samples\.sort\(\(left, right\) => left\.bytes - right\.bytes\)/);
+	// 估算用动画 1/3 和 2/3 处的帧，避开首尾信息不全的画面。
+	assert.match(script, /const indexes = \[Math\.round\(count \/ 3\), Math\.round\(count \* 2 \/ 3\)\]/);
 	assert.match(html, /id="animatedThumbPriority"/);
 	assert.match(script, /priorityInput\.value = animatedProfileConfig\.DEFAULT_PRIORITY/);
 	assert.match(script, /priority: priorityInput\.value/);