SfPdfViewer: "'PdfName' is not a subtype of type 'PdfDictionary?'" on mouseover

Bug description

SfPdfViewer will throw the exception "type 'PdfName' is not a subtype of type 'PdfDictionary?' in type cast" when hovering the viewer with the mouse on specifics PDF.

syncfusion_flutter_pdf: ^27.1.51 syncfusion_flutter_pdfviewer: ^27.1.51

Steps to reproduce

Open the PDF through: "SfPdfViewer.memory" or "SfPdfViewer.file"
Hover the mouse over the viewer

See reproductive repository.

Code sample

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:syncfusion_flutter_pdf/pdf.dart';
import 'package:syncfusion_flutter_pdfviewer/pdfviewer.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // TRY THIS: Try running your application with "flutter run". You'll see
        // the application has a purple toolbar. Then, without quitting the app,
        // try changing the seedColor in the colorScheme below to Colors.green
        // and then invoke "hot reload" (save your changes or press the "hot
        // reload" button in a Flutter-supported IDE, or press "r" if you used
        // the command line to start the app).
        //
        // Notice that the counter didn't reset back to zero; the application
        // state is not lost during the reload. To reset the state, use hot
        // restart instead.
        //
        // This works for code too, not just values: Most code changes can be
        // tested with just a hot reload.
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  Uint8List? _pdfData;

  @override
  void initState() {
    super.initState();
  _loadPDF();
  }

  Future<void> _loadPDF() async {
    final ByteData data = await rootBundle.load('assets/S355J2+N EP30 - 324521 - 2346991068.pdf');
    setState(() {
      _pdfData = data.buffer.asUint8List();
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // TRY THIS: Try changing the color here to a specific color (to
        // Colors.amber, perhaps?) and trigger a hot reload to see the AppBar
        // change color while the other colors stay the same.
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: _pdfData != null ? Center(child: SfPdfViewer.memory(_pdfData!)) : Center(child: CircularProgressIndicator()),
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
    );
  }
}

Screenshots or Video

No.

Stack Traces

```dart ======== Exception caught by gesture library ======================================================= The following _TypeError was thrown while dispatching a pointer event: type 'PdfName' is not a subtype of type 'PdfDictionary?' in type cast When the exception was thrown, this was the stack: #0 FontStructure.getFontEncoding (package:syncfusion_flutter_pdf/src/pdf/implementation/exporting/pdf_text_extractor/font_structure.dart:1106:23) #1 FontStructure.fontEncoding (package:syncfusion_flutter_pdf/src/pdf/implementation/exporting/pdf_text_extractor/font_structure.dart:183:49) #2 FontStructure.decodeTextExtraction (package:syncfusion_flutter_pdf/src/pdf/implementation/exporting/pdf_text_extractor/font_structure.dart:2612:9) #3 ImageRenderer._renderTextElementWithLeading (package:syncfusion_flutter_pdf/src/pdf/implementation/exporting/pdf_text_extractor/image_renderer.dart:642:26) #4 ImageRenderer.renderAsImage (package:syncfusion_flutter_pdf/src/pdf/implementation/exporting/pdf_text_extractor/image_renderer.dart:386:17) #5 PdfTextExtractor._getTextLine (package:syncfusion_flutter_pdf/src/pdf/implementation/exporting/pdf_text_extractor/pdf_text_extractor.dart:346:14) #6 PdfTextExtractor._extractTextLines (package:syncfusion_flutter_pdf/src/pdf/implementation/exporting/pdf_text_extractor/pdf_text_extractor.dart:212:14) #7 PdfTextExtractor.extractTextLines (package:syncfusion_flutter_pdf/src/pdf/implementation/exporting/pdf_text_extractor/pdf_text_extractor.dart:131:12) #8 CanvasRenderBox.findTextWhileHover (package:syncfusion_flutter_pdfviewer/src/control/pdfviewer_canvas.dart:1743:12) #9 PdfPageViewState.build.. (package:syncfusion_flutter_pdfviewer/src/control/pdf_page_view.dart:637:38) #10 State.setState (package:flutter/src/widgets/framework.dart:1203:30) #11 PdfPageViewState.build. (package:syncfusion_flutter_pdfviewer/src/control/pdf_page_view.dart:629:23) #12 RenderMouseRegion.handleEvent (package:flutter/src/rendering/proxy_box.dart:3170:22) #13 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:481:22) #14 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:450:11) #15 GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:426:7) #16 GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:389:5) #17 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:336:7) #18 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:305:9) #19 _invoke1 (dart:ui/hooks.dart:328:13) #20 PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:442:7) #21 _dispatchPointerDataPacket (dart:ui/hooks.dart:262:31) Event: PointerHoverEvent#c96ee(position: Offset(1259.0, 553.0)) position: Offset(1259.0, 553.0) Target: RenderMouseRegion#3fbd6 relayoutBoundary=up5 parentData: (can use size) constraints: BoxConstraints(0.0<=w<=1264.0, 0.0<=h<=Infinity) size: Size(1264.0, 893.2) behavior: opaque listeners: hover cursor: SystemMouseCursor(basic) ==================================================================================================== ```

On which target platforms have you observed this bug?

Windows

Flutter Doctor output

[√] Flutter (Channel stable, 3.24.3, on Microsoft Windows [version 10.0.22631.4169], locale fr-FR) • Flutter version 3.24.3 on channel stable at C:\tools\flutter_windows_3.22.3-stable\flutter • Upstream repository https://github.com/flutter/flutter.git • Framework revision 2663184aa7 (4 weeks ago), 2024-09-11 16:27:48 -0500 • Engine revision 36335019a8 • Dart version 3.5.3 • DevTools version 2.37.3

[√] Windows Version (Installed version of Windows is version 10 or higher)

[√] Android toolchain - develop for Android devices (Android SDK version 35.0.0) • Android SDK at C:\Users\robin\AppData\Local\Android\sdk • Platform android-35, build-tools 35.0.0 • Java binary at: C:\Program Files\Android\Android Studio\jbr\bin\java • Java version OpenJDK Runtime Environment (build 17.0.11+0--11852314) • All Android licenses accepted.

[√] Chrome - develop for the web • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[√] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.9.6) • Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community • Visual Studio Community 2022 version 17.9.34728.123 • Windows 10 SDK version 10.0.22621.0

[√] Android Studio (version 2024.1) • Android Studio at C:\Program Files\Android\Android Studio • Flutter plugin can be installed from: https://plugins.jetbrains.com/plugin/9212-flutter • Dart plugin can be installed from: https://plugins.jetbrains.com/plugin/6351-dart • Java version OpenJDK Runtime Environment (build 17.0.11+0--11852314)

[√] IntelliJ IDEA Ultimate Edition (version 2024.2) • IntelliJ at C:\Users\robin\AppData\Local\Programs\IntelliJ IDEA Ultimate • Flutter plugin version 81.1.3 • Dart plugin version 242.20629

[√] Connected device (3 available) • Windows (desktop) • windows • windows-x64 • Microsoft Windows [version 10.0.22631.4169] • Chrome (web) • chrome • web-javascript • Google Chrome 129.0.6668.90 • Edge (web) • edge • web-javascript • Microsoft Edge 129.0.2792.65

[√] Network resources • All expected network resources are available.

• No issues found!

syncfusion / flutter-widgets