chore: import upstream snapshot with attribution

2026-07-13 12:58:35 +08:00
commit 85453da49f
4031 changed files with 710987 additions and 0 deletions
@@ -0,0 +1,151 @@
+#!/usr/bin/env node
+/**
+ * Objective fidelity gate for figma-motion imports (skill step 2b).
+ *
+ * Compares the HyperFrames render against Figma's own `export_video` output
+ * using MOTION-ENERGY deltas: for each sample window [t, t+interval], the
+ * frame difference ref(t+i)-ref(t) is compared (PSNR) against
+ * render(t+i)-render(t). Static import divergence (fonts, rasterized edges,
+ * subpixel geometry — the hybrid-fidelity ceiling) cancels out of both
+ * deltas, so the score isolates choreography: trajectories, timing, easing.
+ *
+ * Calibration (SDS "Unlocked" card, 2026-07): a faithful translation scored
+ * min 20.3dB / mean 27.7dB; a diverging one (invented retract keyframes,
+ * wrong durations) scored min 5.0dB / mean 23.1dB. Default threshold 15dB
+ * sits between with margin on both sides.
+ *
+ *   node verify-motion.mjs --reference figma-export.mp4 --render out.mp4 \
+ *     [--crop WxH+X+Y] [--interval 0.2] [--min-motion-psnr 15]
+ *
+ * --crop selects the card region inside the (usually larger) composition
+ * frame. Measure it from the render (the card's left/top edge + scaled
+ * size), don't guess: a wrong crop reads as motion divergence.
+ */
+import { execFileSync, spawnSync } from "node:child_process";
+import { mkdtempSync, rmSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+
+function arg(name, fallback) {
+  const i = process.argv.indexOf(`--${name}`);
+  return i > -1 ? process.argv[i + 1] : fallback;
+}
+const reference = arg("reference");
+const render = arg("render");
+if (!reference || !render) {
+  console.error(
+    "usage: verify-motion.mjs --reference ref.mp4 --render out.mp4 [--crop WxH+X+Y] [--interval 0.2] [--min-motion-psnr 15]",
+  );
+  process.exit(2);
+}
+const crop = arg("crop", null);
+const interval = Number(arg("interval", "0.2"));
+const minMotion = Number(arg("min-motion-psnr", "15"));
+
+const ffprobe = (file) =>
+  Number(
+    execFileSync("ffprobe", [
+      "-v",
+      "error",
+      "-show_entries",
+      "format=duration",
+      "-of",
+      "csv=p=0",
+      file,
+    ])
+      .toString()
+      .trim(),
+  );
+const refDur = ffprobe(reference);
+const renderDur = ffprobe(render);
+const end = Math.min(refDur, renderDur) - interval - 0.01;
+
+const dims = execFileSync("ffprobe", [
+  "-v",
+  "error",
+  "-select_streams",
+  "v",
+  "-show_entries",
+  "stream=width,height",
+  "-of",
+  "csv=p=0",
+  reference,
+])
+  .toString()
+  .trim()
+  .split(",")
+  .map(Number);
+const [rw, rh] = dims;
+
+let cropFilter = "";
+if (crop) {
+  const m = crop.match(/^(\d+)x(\d+)\+(\d+)\+(\d+)$/);
+  if (!m) {
+    console.error("bad --crop, expected WxH+X+Y");
+    process.exit(2);
+  }
+  cropFilter = `crop=${m[1]}:${m[2]}:${m[3]}:${m[4]},`;
+}
+
+const dir = mkdtempSync(join(tmpdir(), "verify-motion-"));
+const frame = (src, t, vf, dst) => {
+  const args = ["-y", "-v", "error", "-ss", String(t), "-i", src, "-frames:v", "1"];
+  if (vf) args.push("-vf", vf);
+  execFileSync("ffmpeg", args.concat(dst));
+};
+const diff = (a, b, dst) =>
+  execFileSync("ffmpeg", [
+    "-y",
+    "-v",
+    "error",
+    "-i",
+    a,
+    "-i",
+    b,
+    "-filter_complex",
+    "blend=all_mode=difference",
+    dst,
+  ]);
+const psnr = (a, b) => {
+  // spawnSync with array args (no shell): psnr stats land on stderr
+  const r = spawnSync("ffmpeg", ["-i", a, "-i", b, "-lavfi", "psnr", "-f", "null", "-"], {
+    encoding: "utf8",
+  });
+  const m = (r.stderr || "").match(/average:([\d.]+|inf)/);
+  return m ? (m[1] === "inf" ? 99 : Number(m[1])) : NaN;
+};
+
+const renderVf = `${cropFilter}scale=${rw}:${rh}`;
+const results = [];
+for (let t = 0; t <= end; t = Math.round((t + interval) * 1000) / 1000) {
+  const t1 = Math.round((t + interval) * 1000) / 1000;
+  frame(reference, t, null, join(dir, "ra.png"));
+  frame(reference, t1, null, join(dir, "rb.png"));
+  frame(render, t, renderVf, join(dir, "oa.png"));
+  frame(render, t1, renderVf, join(dir, "ob.png"));
+  diff(join(dir, "ra.png"), join(dir, "rb.png"), join(dir, "rd.png"));
+  diff(join(dir, "oa.png"), join(dir, "ob.png"), join(dir, "od.png"));
+  results.push({
+    t,
+    motion: psnr(join(dir, "rd.png"), join(dir, "od.png")),
+    abs: psnr(join(dir, "rb.png"), join(dir, "ob.png")),
+  });
+}
+rmSync(dir, { recursive: true, force: true });
+
+const min = Math.min(...results.map((r) => r.motion));
+const mean = results.reduce((s, r) => s + r.motion, 0) / results.length;
+for (const r of results)
+  console.log(
+    `window ${r.t.toFixed(2)}s→${(r.t + interval).toFixed(2)}s  motion-psnr=${r.motion.toFixed(2)}dB  (abs=${r.abs.toFixed(1)}dB)${r.motion < minMotion ? "  <-- BELOW THRESHOLD" : ""}`,
+  );
+console.log(
+  `\nwindows=${results.length} min-motion=${min.toFixed(2)}dB mean-motion=${mean.toFixed(2)}dB threshold=${minMotion}dB`,
+);
+if (min < minMotion) {
+  console.log(
+    "VERDICT: FAIL — choreography diverges from the Figma export (check timings, invented keyframes, durations)",
+  );
+  process.exit(1);
+}
+console.log("VERDICT: PASS — motion matches the Figma export within the static-fidelity ceiling");