Class: TTFunk::Table::Cff::PrivateDict

Inherits:
Dict show all
Defined in:
lib/ttfunk/table/cff/private_dict.rb

Overview

CFF Private dict.

Constant Summary collapse

DEFAULT_WIDTH_X_DEFAULT =

Default value of Default Width X.

0
DEFAULT_WIDTH_X_NOMINAL =

Default value of Nominal Width X.

0
PLACEHOLDER_LENGTH =

Length of placeholders.

5
OPERATORS =

Operators we care about in this dict.

{
  subrs: 19,
  default_width_x: 20,
  nominal_width_x: 21,
}.freeze
OPERATOR_CODES =

Inverse operator mapping.

OPERATORS.invert

Constants inherited from Dict

Dict::MAX_OPERANDS, Dict::OPERAND_BZERO, Dict::OPERATOR_BZERO, Dict::VALID_SCI_EXPONENT_RE, Dict::VALID_SCI_SIGNIFICAND_RE, Dict::WIDE_OPERATOR_ADJUSTMENT, Dict::WIDE_OPERATOR_BZERO

Instance Attribute Summary

Attributes inherited from SubTable

#file, #length, #table_offset

Instance Method Summary collapse

Methods inherited from Dict

#[], #[]=, #each

Methods inherited from SubTable

#eot?, #initialize, #read

Constructor Details

This class inherits a constructor from TTFunk::SubTable

Instance Method Details

#default_width_x ⇒ Integer

Default Width X.

Returns:

  • (Integer) 


75
76
77
78
79
80
81
 
# File 'lib/ttfunk/table/cff/private_dict.rb', line 75

def default_width_x
  if (width = self[OPERATORS[:default_width_x]])
    width.first
  else
    DEFAULT_WIDTH_X_DEFAULT
  end
end

#encode ⇒ TTFunk::EncodedString

Encode dict.

Returns:



30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
 
# File 'lib/ttfunk/table/cff/private_dict.rb', line 30

def encode
  # TODO: use mapping to determine which subroutines are still used.
  # For now, just encode them all.
  EncodedString.new do |result|
    each do |operator, operands|
      case OPERATOR_CODES[operator]
      when :subrs
        result << encode_subrs
      else
        operands.each { |operand| result << encode_operand(operand) }
      end

      result << encode_operator(operator)
    end
  end
end

#finalize(private_dict_data) ⇒ void

This method returns an undefined value.

Finalize dict.

Parameters:



51
52
53
54
55
56
57
58
59
60
 
# File 'lib/ttfunk/table/cff/private_dict.rb', line 51

def finalize(private_dict_data)
  return unless subr_index

  encoded_subr_index = subr_index.encode
  encoded_offset = encode_integer32(private_dict_data.length)

  private_dict_data.resolve_placeholder(:"subrs_#{@table_offset}", encoded_offset)

  private_dict_data << encoded_subr_index
end

#nominal_width_x ⇒ Integer

Nominal Width X.

Returns:

  • (Integer) 


86
87
88
89
90
91
92
 
# File 'lib/ttfunk/table/cff/private_dict.rb', line 86

def nominal_width_x
  if (width = self[OPERATORS[:nominal_width_x]])
    width.first
  else
    DEFAULT_WIDTH_X_NOMINAL
  end
end

#subr_index ⇒ TTFunk::Table::Cff::SubrIndex?

Subroutine index.

Returns:



65
66
67
68
69
70
 
# File 'lib/ttfunk/table/cff/private_dict.rb', line 65

def subr_index
  @subr_index ||=
    if (subr_offset = self[OPERATORS[:subrs]])
      SubrIndex.new(file, table_offset + subr_offset.first)
    end
end