bangla_pdf_fixer 3.0.0

Unicode-first Bangla PDF text rendering for Flutter, powered by any_pdf_fixer and HarfBuzz.

Correct Bangla/Bengali Unicode rendering in PDFs generated with Flutter's pdf package.

Version 3 is a full architectural reset. It uses pdf_text_shaper + HarfBuzz for proper OpenType shaping instead of translating Bangla Unicode into legacy ANSI font codes.

What changed in 3.0

Before

Bangla Unicode
→ handwritten rearrangement rules
→ ANSI/legacy character mapping
→ bundled legacy font
→ PDF

Now

Bangla Unicode
→ HarfBuzz GSUB/GPOS shaping
→ positioned glyph IDs
→ vector glyph rendering
→ invisible Unicode extraction layer
→ PDF

Benefits:

• conjuncts and vowel signs are driven by the font's real OpenType rules;
• original Unicode is never destroyed;
• multiline input stays multiline;
• no giant replacement map;
• no package-bundled third-party fonts;
• PDFs can retain useful copy/search text;
• the same shaping engine is reusable for Hindi, Tamil, Arabic, etc.

Supported platforms

Android, iOS, Linux, macOS and Windows.

Web is not supported in 3.0 because the current shaping backend uses native HarfBuzz FFI.

Installation

dependencies:
  bangla_pdf_fixer: ^3.0.0
  pdf: ^3.13.0

Add a Unicode Bengali font to your app, for example:

flutter:
  assets:
    - assets/fonts/your_unicode_bangla_font.ttf

The font is intentionally not bundled by this package. Choose a font whose license permits your use.

Initialize lazily

final banglaFont = await BanglaFontManager.instance.loadAsset(
  'assets/fonts/your_unicode_bangla_font.ttf',
);

Only fonts you actually request are loaded.

Text

BanglaText(
  'আমি বাংলায় লিখছি।',
  style: ShapedTextStyle(
    font: banglaFont,
    fontSize: 16,
  ),
)

Header and paragraph

BanglaHeader(
  'ফলাফল প্রতিবেদন',
  font: banglaFont,
  fontSize: 24,
),

BanglaParagraph(
  'বাংলা অনুচ্ছেদ এখন আসল Unicode হিসেবেই থাকে।',
  font: banglaFont,
  fontSize: 12,
)

Bullet list

BanglaBulletList(
  font: banglaFont,
  items: const [
    'প্রথম বিষয়',
    'দ্বিতীয় বিষয়',
    'তৃতীয় বিষয়',
  ],
)

Table

BanglaTable(
  font: banglaFont,
  headers: const ['নাম', 'শ্রেণি', 'ফলাফল'],
  rows: const [
    ['আরিফ', 'দশম', 'A+'],
    ['নাবিলা', 'নবম', 'A'],
  ],
)

Mixed Bangla + English

Use the universal style's fallback support:

BanglaText(
  'Invoice ১২৩ — মোট ৳৫০০',
  style: ShapedTextStyle(
    font: banglaFont,
    fallbackFonts: [latinFont],
    fontSize: 14,
  ),
)

Migration from 2.x

.fix

You no longer need:

'বাংলা'.fix

The extension remains temporarily for source compatibility, is deprecated, and returns the original string unchanged.

BanglaFontType

The old bundled-font enum has been removed. Version 3 does not redistribute fonts.

Replace:

BanglaFontManager().getFont(BanglaFontType.kalpurush)

with:

final font = await BanglaFontManager.instance.loadAsset(
  'assets/fonts/your_unicode_bangla_font.ttf',
);

Legacy ANSI fonts

Do not use a legacy Bijoy/ANSI font with the Unicode shaper. Use a proper Unicode OpenType Bengali font.

Cleanup

When your PDF generation session is finished:

await document.save();
await BanglaFontManager.instance.dispose();

In a long-running app, keep commonly used fonts cached and dispose them only when the PDF/font service itself is being torn down.

Repository

https://github.com/ardevcraft/bangla_pdf_fixer

License

Apache-2.0. User-supplied fonts remain under their own licenses.