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data: Uint8Array }[] = [];\n\n for (const s of sizes) {\n const scaled = createCanvas(s, s);\n const ctx = scaled.getContext('2d') as\n | CanvasRenderingContext2D\n | OffscreenCanvasRenderingContext2D;\n\n if (!ctx) throw new Error('Failed to get 2D context for ICO encoding');\n\n // Draw source scaled to fit\n ctx.drawImage(canvas as HTMLCanvasElement, 0, 0, s, s);\n\n const pngBlob = await canvasToBlob(scaled, 'image/png');\n const buffer = await pngBlob.arrayBuffer();\n pngEntries.push({ size: s, data: new Uint8Array(buffer) });\n }\n\n // Build ICO file\n // ICO Header: 6 bytes\n // Each directory entry: 16 bytes\n // Then PNG data blocks\n const numImages = pngEntries.length;\n const headerSize = 6;\n const dirSize = 16 * numImages;\n let dataOffset = headerSize + dirSize;\n\n // Calculate total file size\n let totalSize = dataOffset;\n for (const entry of pngEntries) {\n totalSize += entry.data.length;\n }\n\n const buffer = new ArrayBuffer(totalSize);\n const view = new DataView(buffer);\n const bytes = new Uint8Array(buffer);\n\n // ICO Header\n view.setUint16(0, 0, true); // Reserved: 0\n view.setUint16(2, 1, true); // Type: 1 = ICO\n view.setUint16(4, numImages, true); // Number of images\n\n // Directory entries + PNG data\n for (let i = 0; i < pngEntries.length; i++) {\n const entry = pngEntries[i]!;\n const dirOffset = headerSize + i * 16;\n\n // ICO directory entry (16 bytes)\n view.setUint8(dirOffset, entry.size >= 256 ? 0 : entry.size); // Width (0 = 256)\n view.setUint8(dirOffset + 1, entry.size >= 256 ? 0 : entry.size); // Height\n view.setUint8(dirOffset + 2, 0); // Color palette: 0\n view.setUint8(dirOffset + 3, 0); // Reserved: 0\n view.setUint16(dirOffset + 4, 1, true); // Color planes: 1\n view.setUint16(dirOffset + 6, 32, true); // Bits per pixel: 32\n view.setUint32(dirOffset + 8, entry.data.length, true); // Image data size\n view.setUint32(dirOffset + 12, dataOffset, true); // Offset to image data\n\n // Write PNG data\n bytes.set(entry.data, dataOffset);\n dataOffset += entry.data.length;\n }\n\n return new Blob([buffer], { type: meta.mime });\n}\n"]}