Class: Fontisan::Tables::Cmap

Inherits:

Binary::BaseRecord

• Object
• BinData::Record
• Binary::BaseRecord
• Fontisan::Tables::Cmap

Defined in:

lib/fontisan/tables/cmap.rb

Overview

Parser for the ‘cmap’ (Character to Glyph Index Mapping) table

The cmap table maps character codes to glyph indices. It supports multiple encoding formats to accommodate different character sets and Unicode planes.

This implementation focuses on:

• Format 4: Segment mapping for BMP (Basic Multilingual Plane, U+0000-U+FFFF)

• Format 12: Segmented coverage for full Unicode support

Reference: OpenType specification, cmap table

Constant Summary

PLATFORM_UNICODE =

Platform IDs

0

PLATFORM_MACINTOSH =

1

PLATFORM_MICROSOFT =

3

ENC_MS_UNICODE_BMP =

Microsoft Encoding IDs

1

ENC_MS_UNICODE_UCS4 =

Unicode BMP (UCS-2)

10

Instance Method Summary

• #unicode_mappings ⇒ Object

  Parse encoding records and subtables.

Methods inherited from Binary::BaseRecord

#raw_data, read, #valid?

Instance Method Details

#unicode_mappings ⇒ Object

Parse encoding records and subtables

# File 'lib/fontisan/tables/cmap.rb', line 35

def unicode_mappings
  @unicode_mappings ||= parse_mappings
end