优化缩略图

js/animated-profiles.js

@@ -32,19 +32,35 @@ const ANIMATED_PRIORITIES = {
 
 const DEFAULT_PRIORITY = 'resolution';
 
+/**
+ * 可选的输出画布边长（正方形），界面上的下拉就是这两项。
+ *
+ * Eagle 缩略图网格里每格实际只显示 100–240px 左右，200 与 400 在这个尺寸下几乎看不出差别，
+ * 但像素数只有四分之一，体积能降约 4 倍。配置里写的细节分辨率超过所选边长时会被压下来，
+ * 所以同一份档位表在两种尺寸下都能用。
+ */
+const ANIMATED_OUTPUT_SIZES = [200, 400];
+const DEFAULT_OUTPUT_SIZE = 200;
+
 // 相邻锚点之间插多少个采样点。数值越大，越容易压在目标体积附近，但粗估阶段耗时略增。
 const PATH_STEPS_PER_SEGMENT = 6;
 
-function animatedProfiles(priority) {
+function animatedProfiles(priority, outputSize) {
+	const limit = outputSize || DEFAULT_OUTPUT_SIZE;
 	const plan = ANIMATED_PRIORITIES[priority] || ANIMATED_PRIORITIES[DEFAULT_PRIORITY];
-	return plan.map(([size, fps, quality]) => ({ size, fps, quality }));
+	return plan.map(([size, fps, quality]) => ({
+		size: Math.min(size, limit),
+		fps,
+		quality,
+	}));
 }
 
 /**
  * 把锚点路径插值成更密的采样路径，供按目标体积二分定位使用。
  * 分辨率取整、帧率至少 1、质量保留两位小数；首尾锚点原样保留。
  */
-function expandAnimatedPath(priority) {
+function expandAnimatedPath(priority, outputSize) {
+	const limit = outputSize || DEFAULT_OUTPUT_SIZE;
 	const anchors = ANIMATED_PRIORITIES[priority] || ANIMATED_PRIORITIES[DEFAULT_PRIORITY];
 	const lerp = (from, to, t) => from + (to - from) * t;
 	const path = [];
@@ -54,15 +70,23 @@ function expandAnimatedPath(priority) {
 		for (let step = 0; step < PATH_STEPS_PER_SEGMENT; step++) {
 			const t = step / PATH_STEPS_PER_SEGMENT;
 			path.push({
-				size: Math.round(lerp(fromSize, toSize, t)),
+				size: Math.min(limit, Math.round(lerp(fromSize, toSize, t))),
 				fps: Math.max(1, Math.round(lerp(fromFps, toFps, t))),
 				quality: Math.round(lerp(fromQuality, toQuality, t) * 100) / 100,
 			});
 		}
 	}
 	const [size, fps, quality] = anchors[anchors.length - 1];
-	path.push({ size, fps, quality });
+	path.push({ size: Math.min(size, limit), fps, quality });
 	return path;
 }
 
-module.exports = { ANIMATED_PRIORITIES, DEFAULT_PRIORITY, PATH_STEPS_PER_SEGMENT, animatedProfiles, expandAnimatedPath };
+module.exports = {
+	ANIMATED_PRIORITIES,
+	DEFAULT_PRIORITY,
+	ANIMATED_OUTPUT_SIZES,
+	DEFAULT_OUTPUT_SIZE,
+	PATH_STEPS_PER_SEGMENT,
+	animatedProfiles,
+	expandAnimatedPath,
+};