103 lines
4.0 KiB
JavaScript
103 lines
4.0 KiB
JavaScript
// 动态缩略图的档位配置。数值与主插件 js/animated-profiles.js 保持一致，
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// 后台插件没有参数面板，所以这里只当默认值来源，改这里就等于改后台插件的默认渲染参数。
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(function () {
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'use strict';
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/**
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* 每项是 [细节分辨率, 帧率, 编码质量]，作为搜索路径上的锚点：
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* - 细节分辨率决定画面保留多少细节（输出画布始终是画布边长，小分辨率会被放大填满）；
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* - 帧率决定每秒采样多少帧，只改采样密度不改时间轴，每档的帧延迟会自动重算；
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* - 编码质量是 0–1 的 WebP 质量。
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*
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* 数组顺序是从最高画质到最低画质的搜索方向。运行时会在相邻锚点之间插值成一条更密的
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* 路径，再按目标体积在路径上定位，取命中位置附近若干档完整生成，挑出符合体积的那一档。
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*/
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const ANIMATED_PRIORITIES = {
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// 分辨率优先：先把帧率压到底，再降分辨率。
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resolution: [
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[400, 18, 1.0], [400, 15, 0.8], [400, 12, 0.6], [400, 9, 0.4], [400, 6, 0.2],
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[200, 18, 1.0], [200, 15, 0.8], [200, 12, 0.6], [200, 9, 0.4], [200, 6, 0.2],
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],
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// 帧率优先：先把分辨率压到底，再降帧率。
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framerate: [
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[400, 18, 1.0], [400, 18, 0.5], [350, 15, 1.0], [350, 15, 0.5], [300, 9, 1.0],
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[300, 9, 0.5], [250, 6, 1.0], [250, 6, 0.5], [200, 9, 1.0], [200, 6, 0.5],
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],
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// 交替进行：分辨率和帧率交替下降。
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balanced: [
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[400, 15, 0.8], [400, 12, 0.6], [400, 9, 0.4], [400, 6, 0.2], [200, 15, 0.8],
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[200, 12, 0.6], [200, 9, 0.4], [200, 6, 0.2], [100, 3, 0.5], [100, 3, 0.1],
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],
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};
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const DEFAULT_PRIORITY = 'resolution';
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/** 可选的输出画布边长（正方形）。后台插件默认用 200。 */
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const ANIMATED_OUTPUT_SIZES = [200, 400];
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const DEFAULT_OUTPUT_SIZE = 200;
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/** 目标体积的默认建议值：每秒动画配 25 KB，夹在 25–100 KB 之间。 */
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const SIZE_PER_SECOND = 25;
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const SIZE_SUGGESTION_RANGE = [25, 100];
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// 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，粗估阶段耗时略增。
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const PATH_STEPS_PER_SEGMENT = 6;
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function suggestSize(seconds) {
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const [min, max] = SIZE_SUGGESTION_RANGE;
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return Math.max(min, Math.min(max, Math.round((Number(seconds) || 0) * SIZE_PER_SECOND)));
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}
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function animatedProfiles(priority, outputSize) {
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const limit = outputSize || DEFAULT_OUTPUT_SIZE;
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const plan = ANIMATED_PRIORITIES[priority] || ANIMATED_PRIORITIES[DEFAULT_PRIORITY];
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return plan.map(([size, fps, quality]) => ({
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size: Math.min(size, limit),
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fps,
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quality,
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}));
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}
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/**
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* 把锚点路径插值成更密的采样路径，供按目标体积定位使用。
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* 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。
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*/
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function expandAnimatedPath(priority, outputSize) {
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const limit = outputSize || DEFAULT_OUTPUT_SIZE;
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const anchors = ANIMATED_PRIORITIES[priority] || ANIMATED_PRIORITIES[DEFAULT_PRIORITY];
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const lerp = (from, to, t) => from + (to - from) * t;
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const path = [];
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for (let index = 0; index < anchors.length - 1; index++) {
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const [fromSize, fromFps, fromQuality] = anchors[index];
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const [toSize, toFps, toQuality] = anchors[index + 1];
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for (let step = 0; step < PATH_STEPS_PER_SEGMENT; step++) {
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const t = step / PATH_STEPS_PER_SEGMENT;
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path.push({
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size: Math.min(limit, Math.round(lerp(fromSize, toSize, t))),
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fps: Math.max(1, Math.round(lerp(fromFps, toFps, t))),
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quality: Math.round(lerp(fromQuality, toQuality, t) * 100) / 100,
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});
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}
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}
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const [size, fps, quality] = anchors[anchors.length - 1];
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path.push({ size: Math.min(size, limit), fps, quality });
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return path;
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}
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const api = {
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ANIMATED_PRIORITIES,
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DEFAULT_PRIORITY,
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ANIMATED_OUTPUT_SIZES,
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DEFAULT_OUTPUT_SIZE,
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SIZE_PER_SECOND,
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SIZE_SUGGESTION_RANGE,
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PATH_STEPS_PER_SEGMENT,
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animatedProfiles,
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expandAnimatedPath,
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suggestSize,
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};
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if (typeof window !== 'undefined') window.SpineAnimatedProfiles = api;
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else if (typeof module !== 'undefined' && module.exports) module.exports = api;
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})();
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