Class: Fontisan::Subset::TableStrategy::Cmap

Inherits:

Object

• Object
• Fontisan::Subset::TableStrategy::Cmap

Defined in:

lib/fontisan/subset/table_strategy/cmap.rb

Overview

Cmap strategy: rebuild cmap containing only the (codepoint → new GID) mappings for codepoints whose original GID is retained. Emits a format-4 subtable for BMP codepoints and a format-12 subtable for supplementary-plane codepoints.

Defined Under Namespace

Classes: Builder

Class Method Summary

• .call(context:, tag:, table:) ⇒ String

  Binary cmap bytes for the subset.

Class Method Details

.call(context:, tag:, table:) ⇒ String

Returns binary cmap bytes for the subset.

Parameters:

• context (SubsetContext)
• tag (String) —

  "cmap"

• table (Cmap) —

  parsed cmap table

Returns:

• (String) —

  binary cmap bytes for the subset

# File 'lib/fontisan/subset/table_strategy/cmap.rb', line 15

def self.call(context:, tag:, table:)
  new_mappings = {}
  table.unicode_mappings.each do |char_code, old_gid|
    new_gid = context.mapping.new_id(old_gid)
    new_mappings[char_code] = new_gid if new_gid
  end
  Builder.new(new_mappings).build
end