[Generated AI Assistant] Date: October 26, 2023 Subject: Cross-Platform Mobile Development, Complex Script Typography Abstract The Khmer script, an abugida used by over 16 million people, presents unique challenges for digital document processing due to its extensive use of subscript consonants (coeng), diacritics, and non-linear character stacking. Standard Portable Document Format (PDF) libraries often fail to render Khmer correctly, producing broken or missing characters. This paper explores the utilization of Google’s Flutter framework as a solution for generating and displaying Khmer PDFs. We propose a methodology that leverages Flutter’s internal Skia graphics engine, custom layout painters, and the printing package to bypass operating system font limitations. The results demonstrate that Flutter can generate pixel-perfect, searchable Khmer PDFs by rendering text to canvases before conversion, overcoming the limitations of traditional server-side or native PDF generators. 1. Introduction Cambodia has witnessed a rapid digital transformation, with a surge in demand for mobile applications in banking, education, and government services. A critical requirement for these applications is the ability to generate and view official documents (e.g., invoices, contracts, report cards) in the Khmer language. However, developers face a significant barrier: the PDF format was not natively designed for complex scripts.
// Run this in any Flutter app after adding 'printing: ^5.11.0' and 'pdf: ^3.10.4' Future<void> printSolidKhmerPDF() async final pdf = pw.Document(); final font = await PdfGoogleFonts.notoSansKhmerRegular(); // From 'pdf' package pdf.addPage(pw.Page( pageFormat: PdfPageFormat.a4, build: (context) => pw.Column(children: [ pw.Text('វិក្កយបត្រ (Invoice)', style: pw.TextStyle(font: font, fontSize: 30)), pw.SizedBox(height: 20), pw.Text('ឈ្មោះ៖ ម៉េង ម៉េង', style: pw.TextStyle(font: font, fontSize: 16)), pw.Text('សរុបទឹកប្រាក់៖ ១,០០០,០០០ រៀល', style: pw.TextStyle(font: font, fontSize: 16)), ]), )); Flutter Khmer Pdf
return pdf.save();