Class: Ucode::Models::Audit::FsSelectionFlags

Inherits:
Lutaml::Model::Serializable
  • Object
show all
Defined in:
lib/ucode/models/audit/fs_selection_flags.rb

Overview

Decoded OS/2 fsSelection bitfield → sorted array of flag names.

Per OpenType spec, fsSelection is a bitfield with these bits:

bit 0 (0x001): italic
bit 1 (0x002): underscore
bit 2 (0x004): negative
bit 3 (0x008): outlined
bit 4 (0x010): strikeout
bit 5 (0x020): bold
bit 6 (0x040): regular
bit 7 (0x080): use_typo_metrics
bit 8 (0x100): wws
bit 9 (0x200): oblique

Returns names in spec order (bit ascending).

Constant Summary collapse

FLAGS = 
{
  0x001 => "italic",
  0x002 => "underscore",
  0x004 => "negative",
  0x008 => "outlined",
  0x010 => "strikeout",
  0x020 => "bold",
  0x040 => "regular",
  0x080 => "use_typo_metrics",
  0x100 => "wws",
  0x200 => "oblique",
}.freeze

Class Method Summary collapse

Class Method Details

.decode(fs_selection) ⇒ Array<String>?

Decoded array of flag names in spec order (bit ascending).

Parameters:

  • fs_selection (Integer, nil) —

    raw OS/2 fsSelection value

Returns:

  • (Array<String>, nil) 


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# File 'lib/ucode/models/audit/fs_selection_flags.rb', line 48

def self.decode(fs_selection)
  return nil if fs_selection.nil?

  FLAGS.each_with_object([]) do |(mask, name), acc|
    acc << name if fs_selection & mask != 0
  end
end

.from_fs_selection(fs_selection) ⇒ Object

Construct from a raw fsSelection value.

Parameters:

  • fs_selection (Integer, nil) 


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# File 'lib/ucode/models/audit/fs_selection_flags.rb', line 59

def self.from_fs_selection(fs_selection)
  new(flags: decode(fs_selection))
end