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perf: throttle jsQR camera fallback to a few decodes per second

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This commit is contained in:
Matt Van Horn
2026-07-01 17:07:30 +08:00
committed by Shuai
parent d024798548
commit 73bbe8b268
1 changed files with 11 additions and 1 deletions
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webapp/src/components/vault/VaultEditor.tsx
+11 -1
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@@ -229,6 +229,7 @@ export default function VaultEditor(props: VaultEditorProps) {
return; return;
} }
let stopped = false; let stopped = false;
let lastCanvasScan = 0;
const detector = createTotpQrDetector(); const detector = createTotpQrDetector();
if (!navigator.mediaDevices?.getUserMedia) { if (!navigator.mediaDevices?.getUserMedia) {
setTotpQrStatus(t('txt_totp_qr_camera_unavailable')); setTotpQrStatus(t('txt_totp_qr_camera_unavailable'));
@@ -255,7 +256,16 @@ export default function VaultEditor(props: VaultEditorProps) {
// Fall back to jsQR when the native detector is present but not usable. // Fall back to jsQR when the native detector is present but not usable.
} }
} }
if (!value) value = decodeTotpQrCanvas(video); // The jsQR fallback runs a synchronous full-frame decode, so throttle
// it to a few times per second instead of every animation frame to
// avoid pegging the CPU while a code is being aligned.
if (!value) {
const now = performance.now();
if (now - lastCanvasScan >= 250) {
lastCanvasScan = now;
value = decodeTotpQrCanvas(video);
}
}
if (value && applyTotpQrValue(value)) return; if (value && applyTotpQrValue(value)) return;
} catch { } catch {
// Keep the camera active; transient frame decode failures are common. // Keep the camera active; transient frame decode failures are common.