[PDFBOX-4189] Enable PDF creation with Indian languages, by reading and utilizing the GSUB table

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.27, 3.0.0 PDFBox
• Fix Version/s: 3.0.0 PDFBox
• Component/s: FontBox, PDModel
• Labels: gsub
• External issue URL: https://github.com/apache/pdfbox/pull/46
• Assignee: Andreas Lehmkühler
• Reporter: Palash Ray
• Created: 14/Apr/18 14:21
• Updated: 27/Apr/24 09:20
• Resolved: 29/Jan/23 16:42

Description

Implemented proper rendering of Indian languages, which need extensive Glyph substitution. The GSUB table has been read and used effectively to replace some compound words with their respective Glyphs. All tests are passing. I have tested this for the Bengali font. Please review these changes and let me know if it makes sense to incorporate these.

Issue Links

• is blocked by: PDFBOX-4220 FontBox sets GSUB features globally across shared fonts
• is related to: PDFBOX-5810 Wrong glyph in Single Substitution Format 2 extraction to map
• links to: GitHub Pull Request #153