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fix: composite transparent QR uploads over white before jsQR decode

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Matt Van Horn
2026-07-01 17:07:30 +08:00
committed by Shuai
parent b0a679b1c2
commit d024798548
1 changed files with 5 additions and 0 deletions
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webapp/src/components/vault/VaultEditor.tsx
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@@ -181,6 +181,11 @@ export default function VaultEditor(props: VaultEditorProps) {
canvas.height = height; canvas.height = height;
const context = canvas.getContext('2d'); const context = canvas.getContext('2d');
if (!context) return ''; if (!context) return '';
// jsQR ignores alpha and reads RGB directly, so transparent pixels would be
// treated as black. Composite over white first so transparent-background QR
// exports do not become black-on-black and fail to decode.
context.fillStyle = '#ffffff';
context.fillRect(0, 0, width, height);
context.drawImage(source, 0, 0, width, height); context.drawImage(source, 0, 0, width, height);
const imageData = context.getImageData(0, 0, width, height); const imageData = context.getImageData(0, 0, width, height);
return String(jsQR(imageData.data, width, height)?.data || '').trim(); return String(jsQR(imageData.data, width, height)?.data || '').trim();