qrapp/debug-camera.html at main · RefNull/qrapp · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover, maximum-scale=1, user-scalable=no">
<title>Camera geometry probe</title>
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<style>
  * { box-sizing: border-box; }
  html, body { height: 100%; margin: 0; overflow: hidden; background: #123; }
  #app { position: relative; height: 100vh; height: 100dvh; width: 100%; }
  #stage { position: absolute; inset: 0; background: #000; overflow: hidden; }

  video {
    position: absolute; top: 0; left: 0;
    width: 100%; height: 100%;
    min-width: 100%; min-height: 100%;
    object-fit: cover;
    background: #000;
  }
  video.modeA { transform: translateZ(0); backface-visibility: hidden; }
  video.modeC { object-fit: fill; width: auto; height: auto;
                min-width: 0; min-height: 0; transform-origin: top left; }

  /* Gate variants start hidden and are revealed by script. */
  video.gated { opacity: 0; visibility: hidden; transition: opacity 280ms ease; }
  video.gated.ready { opacity: 1; visibility: visible; }

  #out { position: absolute; left: 0; right: 0; top: 0; max-height: 72%;
         overflow: auto; font: 10px/1.3 ui-monospace, Menlo, monospace;
         color: #0f0; background: rgba(0,0,0,0.85); padding: 6px 8px;
         white-space: pre; z-index: 5; }
  #bar { position: absolute; left: 0; right: 0; bottom: 0; z-index: 6;
         display: flex; flex-wrap: wrap; gap: 6px; padding: 10px;
         background: rgba(0,0,0,0.8); }
  #bar a { flex: 1 1 28%; text-align: center; padding: 12px 6px;
           font: 600 14px -apple-system, sans-serif; text-decoration: none;
           border-radius: 10px; background: #2866bd; color: #fff; }
  #bar a.on { background: #0a0; }
  .edge { position: fixed; background: magenta; z-index: 4; }
</style>
</head>
<body>
<div id="app">
  <div id="stage"><video id="v" playsinline muted autoplay></video></div>
  <pre id="out">starting…</pre>
  <div id="bar"></div>
</div>
<div class="edge" style="left:0;top:0;right:0;height:2px"></div>
<div class="edge" style="left:0;bottom:0;right:0;height:2px"></div>
<script>
// Recording starts at the first script tick, before the camera is requested,
// so the whole load-time window is captured rather than sampled by hand.
const T0 = performance.now();
const q = new URLSearchParams(location.search);
const MODE = (q.get('mode') || 'A').toUpperCase();
const GATE = q.get('gate') || 'none';

const v = document.getElementById('v');
const out = document.getElementById('out');
const marks = [];
const rows = [];
let lastKey = '';

function mark(label) { marks.push(`${(performance.now() - T0).toFixed(0)}ms ${label}`); }

function sample() {
  const r = v.getBoundingClientRect();
  const cs = getComputedStyle(v);
  const key = [v.videoWidth, v.videoHeight, Math.round(r.width), Math.round(r.height),
               Math.round(r.left), Math.round(r.top), v.readyState, cs.visibility,
               cs.objectFit].join('|');
  if (key !== lastKey) {
    lastKey = key;
    rows.push({ t: Math.round(performance.now() - T0), vw: v.videoWidth, vh: v.videoHeight,
                w: Math.round(r.width), h: Math.round(r.height),
                x: Math.round(r.left), y: Math.round(r.top),
                rs: v.readyState, vis: cs.visibility.slice(0,3) });
  }
  requestAnimationFrame(sample);
}

function probeUnit(u) {
  const d = document.createElement('div');
  d.style.cssText = `position:fixed;height:100${u};top:-99999px;`;
  document.body.appendChild(d);
  const px = d.getBoundingClientRect().height; d.remove(); return px;
}
function probeInset(side) {
  const d = document.createElement('div');
  d.style.cssText = `position:fixed;height:env(safe-area-inset-${side},0px);`;
  document.body.appendChild(d);
  const px = d.getBoundingClientRect().height; d.remove(); return px;
}

function render() {
  const app = document.getElementById('app').getBoundingClientRect();
  const t = v.srcObject && v.srcObject.getVideoTracks()[0];
  const s = t && t.getSettings ? t.getSettings() : {};
  const head = [
    `mode=${MODE} gate=${GATE}  standalone=${matchMedia('(display-mode: standalone)').matches}`,
    `dpr=${devicePixelRatio} screen=${screen.width}x${screen.height} inner=${innerWidth}x${innerHeight}`,
    `100vh=${probeUnit('vh').toFixed(0)} 100dvh=${probeUnit('dvh').toFixed(0)} safeT=${probeInset('top').toFixed(0)} safeB=${probeInset('bottom').toFixed(0)}`,
    `#app=${Math.round(app.width)}x${Math.round(app.height)}@${Math.round(app.top)} track=${s.width}x${s.height}`,
    '',
    'EVENTS:', ...marks, '',
    'GEOMETRY CHANGES (t, intrinsic, rect wxh @x,y, readyState, vis):',
  ];
  const body = rows.map(r =>
    `${String(r.t).padStart(5)}  ${String(r.vw).padStart(4)}x${String(r.vh).padEnd(4)}  ` +
    `${String(r.w).padStart(4)}x${String(r.h).padEnd(4)} @${r.x},${r.y}  rs=${r.rs} ${r.vis}`);
  out.textContent = head.concat(body).join('\n');
}

const bar = document.getElementById('bar');
for (const [label, href] of [
  ['A cold', '?mode=A'], ['B cold', '?mode=B'], ['C cold', '?mode=C'],
  ['A+gate', '?mode=A&gate=app'], ['A+gate+', '?mode=A&gate=settle'], ['reload', location.search || '?mode=A'],
]) {
  const a = document.createElement('a');
  a.textContent = label; a.href = href;
  if (location.search === href) a.className = 'on';
  bar.appendChild(a);
}

function sizeToCover() {
  if (MODE !== 'C') return;
  const stage = document.getElementById('stage').getBoundingClientRect();
  const vw = v.videoWidth, vh = v.videoHeight;
  if (!vw || !vh) return;
  const scale = Math.max(stage.width / vw, stage.height / vh);
  const w = vw * scale, h = vh * scale;
  v.style.width = w + 'px'; v.style.height = h + 'px';
  v.style.transform = `translate(${(stage.width - w) / 2}px, ${(stage.height - h) / 2}px)`;
}

v.className = 'mode' + MODE + (GATE === 'none' ? '' : ' gated');

(async () => {
  requestAnimationFrame(sample);
  setInterval(render, 200);
  mark('requesting camera');
  let stream;
  try {
    stream = await navigator.mediaDevices.getUserMedia({
      video: { facingMode: { ideal: 'environment' }, width: { ideal: 1280 }, height: { ideal: 720 } },
      audio: false });
  } catch (e) { mark('getUserMedia FAILED ' + e.name); return; }
  mark('stream acquired');
  v.srcObject = stream;
  v.addEventListener('loadedmetadata', () => mark(`loadedmetadata ${v.videoWidth}x${v.videoHeight}`));
  v.addEventListener('resize', () => { mark(`video resize ${v.videoWidth}x${v.videoHeight}`); sizeToCover(); });
  await v.play().catch(e => mark('play FAILED ' + e.name));
  mark('play() resolved');
  sizeToCover();

  if (GATE === 'none') return;

  // Wait for real intrinsic dimensions.
  await new Promise(res => {
    const check = () => (v.videoWidth && v.videoHeight && v.readyState >= 2) ? res() : requestAnimationFrame(check);
    check();
  });
  mark('dimensions known');

  if ('requestVideoFrameCallback' in v) {
    await new Promise(res => v.requestVideoFrameCallback(() => res()));
    mark('first painted frame');
  }

  if (GATE === 'settle') {
    // Hold for several consecutive frames so WebKit has laid the media layer
    // out at least once more after the first frame.
    for (let i = 0; i < 8; i++) await new Promise(r => requestAnimationFrame(r));
    mark('settle frames elapsed');
  } else {
    await new Promise(r => requestAnimationFrame(() => requestAnimationFrame(r)));
  }

  v.classList.add('ready');
  mark('REVEALED');
})();
</script>
</body>
</html>