esc_pos_printer with pdf/printing

main.yaml

import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:flutter_esc_pos_network/flutter_esc_pos_network.dart';
import 'package:flutter_esc_pos_utils/flutter_esc_pos_utils.dart';
import 'package:image/image.dart' as im;
import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pdf;
import 'package:printing/printing.dart';

extension PdfRasterExt on PdfRaster {
  im.Image asImage() {
    return im.Image.fromBytes(width, height, pixels);
  }
}

const printerIp = '192.168.0.123';
const printerDpi = 203.0;

void main() => runApp(const MyApp());

class MyApp extends StatefulWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Test'),
        ),
        body: PdfPreview(
          build: (_) => _buildDocument(),
          allowPrinting: false,
          canChangeOrientation: false,
          canChangePageFormat: false,
          actions: [
            PdfPreviewAction(
              icon: const Icon(Icons.print),
              onPressed: (context, build, pageFormat) => _print(),
            )
          ],
        ),
      ),
    );
  }

  Future<Uint8List> _buildDocument() async {
    final doc = pdf.Document();

    doc.addPage(
      pdf.Page(
        orientation: pdf.PageOrientation.landscape,
        pageFormat: PdfPageFormat.roll80,
        build: (context) => pdf.Center(
          child: pdf.Text(
            'Hello World',
            style: pdf.TextStyle(
              fontWeight: pdf.FontWeight.bold,
              fontSize: 20,
            ),
          ),
        ),
      ),
    );

    doc.addPage(
      pdf.Page(
        pageFormat: PdfPageFormat.roll80,
        build: (context) => pdf.Center(
          child: pdf.PdfLogo(),
        ),
      ),
    );

    return await doc.save();
  }

  Future<void> _print() async {
    final printer = PrinterNetworkManager(printerIp);
    final res = await printer.connect();

    if (res != PosPrintResult.success) {
      throw Exception('Unable to connect to the printer');
    }

    final profile = await CapabilityProfile.load();
    final generator = Generator(PaperSize.mm80, profile);
    var ticket = <int>[];

    await for (var page
        in Printing.raster(await _buildDocument(), dpi: printerDpi)) {
      final image = page.asImage();
      ticket += generator.image(image);
      ticket += generator.feed(2);
      ticket += generator.cut();
    }

    printer.printTicket(ticket);
    printer.disconnect();
  }
}

pubspec.yaml

name: print_pos
description: A new Flutter project.
version: 1.0.0+1

environment:
  sdk: ">=2.12.0-0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  flutter_esc_pos_utils:
  flutter_esc_pos_network:
  printing:
  pdf:

flutter:
  uses-material-design: true

I have tried it. Image is printing perfectly. But when I am printing any text, it's just printing a blank page. I have tried with multiple fonts.