feat: same code to render from both client and server

utils/renderer.ts

@@ -0,0 +1,45 @@
+import { loadImage, type Canvas, type CanvasRenderingContext2D } from "canvas";
+import QRCode from "qrcode";
+
+export const CANVAS_SIZE = 1000;
+export const LOGO_PADDING = 1;
+
+export const renderQRCodeToCanvas = async (
+  canvas: HTMLCanvasElement | Canvas,
+  content: string,
+  logoUrl: string,
+) => {
+  await QRCode.toCanvas(canvas, content, {
+    errorCorrectionLevel: "H",
+    width: CANVAS_SIZE,
+    margin: 1,
+  });
+
+  const qrCode = QRCode.create(content, { errorCorrectionLevel: "H" });
+  const moduleCount = qrCode.modules.size + 2;
+
+  const logoImage = await loadImage(logoUrl);
+
+  const moduleSize = CANVAS_SIZE / moduleCount;
+
+  let logoModules = Math.floor(moduleCount * 0.3);
+  if (logoModules % 2 !== moduleCount % 2) {
+    logoModules += 1;
+  }
+
+  const backgroundSize = logoModules * moduleSize + 1;
+  const backgroundPosition = (moduleSize * (moduleCount - logoModules)) / 2;
+
+  const logoSize = backgroundSize - LOGO_PADDING * 2;
+  const logoPosition = backgroundPosition + LOGO_PADDING;
+
+  const ctx = canvas.getContext("2d") as CanvasRenderingContext2D;
+  ctx.fillStyle = "white";
+  ctx.fillRect(
+    backgroundPosition,
+    backgroundPosition,
+    backgroundSize,
+    backgroundSize,
+  );
+  ctx.drawImage(logoImage, logoPosition, logoPosition, logoSize, logoSize);
+};