It was working fine with version 3.7.1

Hi @DavBfr,

any update?

No update, it's a bug to be fixed.

@DavBfr any update here?
We are not able to use the updated version of the library until this is fixed.

Is this issue from the Pdfium library?
I'm not able to understand the cause of this issue.

I checked, the issue starts from this commit 13f95f1

@deepak786 I also have the same problem

@DavBfr any update on this?

Any updates on this issue ?

@DavBfr

In ttf_parser file, function _parseGlyphs(), this is the if condition which may be causing this issue

if (glyphSizes[glyphIndex] == 0) {
        glyphInfoMap[glyphIndex] = PdfFontMetrics(
          left: 0,
          top: 0,
          right: 0,
          bottom: 0,
          ascent: 0,
          descent: 0,
          advanceWidth: advanceWidth / unitsPerEm,
          leftBearing: leftBearing / unitsPerEm,
        );
        continue;
      }

if we change the condition to also check the advanceWidth

if (glyphSizes[glyphIndex] == 0 && advanceWidth == 0) {
        glyphInfoMap[glyphIndex] = PdfFontMetrics(
          left: 0,
          top: 0,
          right: 0,
          bottom: 0,
          ascent: 0,
          descent: 0,
          advanceWidth: 0, // this will always be zero.
          leftBearing: leftBearing / unitsPerEm,
        );
        continue;
      }

then it resolves this issue, but I want to confirm since I don't have enough knowledge about the ttf. I have learnt about this advance width definition from link https://docs.aspose.com/font/net/what-is-font/glyph/

If the above solution seems fine to you, then I will create the PR for the same.

Yes please create a PR. We'll see what the automated tests have to say.

I think this issue has been fixed some time ago already.

I have tested with latest master (printing/example/main.dart with multiple line breaks), and this issue is present.

This is what I have:

Row(children: [
  Text(
    'Hello World\nHello World\nHello World',
  ),
  Text(
    'Hello World\n\nHello World\n\nHello World',
  ),
  Text(
    'Hello World\n\n\nHello World\n\n\nHello World',
  ),
]),

Use the google font in the text style to reproduce the issue

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days

The output seems to depend on the font used.

If I use the default font, it works.
If I load a TTF font, I have the issue.

Closing this stale issue because it has no activity.

This is what I get when using the following code:

// ignore_for_file: public_member_api_docs

import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pw;
import 'package:printing/printing.dart';

Future<void> main() async {
  runApp(const MyApp('Printing Demo'));
}

class MyApp extends StatelessWidget {
  const MyApp(this.title, {Key? key}) : super(key: key);

  final String title;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text(title)),
        body: PdfPreview(
          build: (format) => _generatePdf(format, title),
        ),
      ),
    );
  }

  Future<Uint8List> _generatePdf(PdfPageFormat format, String title) async {
    final pdf = pw.Document(version: PdfVersion.pdf_1_5, compress: true);
    final font = await PdfGoogleFonts.nunitoExtraLight();

    pdf.addPage(
      pw.Page(
        pageFormat: format,
        build: (context) {
          return pw.Column(
            children: [
              pw.Text("Test\n\nTest\n\n\nTest\n\n\n\nTest",
                  style: pw.TextStyle(font: font, fontSize: 30)),
            ],
          );
        },
      ),
    );

    return pdf.save();
  }
}

This pull request seems to fix the issue:
f24ddfa

any updates?

HI, any updates on this issue?

This is what I get when using the following code:

// ignore_for_file: public_member_api_docs

import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:pdf/pdf.dart';
import 'package:pdf/widgets.dart' as pw;
import 'package:printing/printing.dart';

Future<void> main() async {
  runApp(const MyApp('Printing Demo'));
}

class MyApp extends StatelessWidget {
  const MyApp(this.title, {Key? key}) : super(key: key);

  final String title;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text(title)),
        body: PdfPreview(
          build: (format) => _generatePdf(format, title),
        ),
      ),
    );
  }

  Future<Uint8List> _generatePdf(PdfPageFormat format, String title) async {
    final pdf = pw.Document(version: PdfVersion.pdf_1_5, compress: true);
    final font = await PdfGoogleFonts.nunitoExtraLight();

    pdf.addPage(
      pw.Page(
        pageFormat: format,
        build: (context) {
          return pw.Column(
            children: [
              pw.Text("Test\n\nTest\n\n\nTest\n\n\n\nTest",
                  style: pw.TextStyle(font: font, fontSize: 30)),
            ],
          );
        },
      ),
    );

    return pdf.save();
  }
}

This pull request seems to fix the issue: f24ddfa

No, it didn't work