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)
Source Code
lib/ttfunk/table/cff/private_dict.rb, line 75
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def default_width_x

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  if (width = self[OPERATORS[:default_width_x]])

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    width.first

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  else

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    DEFAULT_WIDTH_X_DEFAULT

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  end

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end

#encode ⇒ TTFunk::EncodedString

Encode dict.

Returns:

Source Code
lib/ttfunk/table/cff/private_dict.rb, line 30
30
def encode

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  # TODO: use mapping to determine which subroutines are still used.

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  # For now, just encode them all.

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  EncodedString.new do |result|

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    each do |operator, operands|

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      case OPERATOR_CODES[operator]

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      when :subrs

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        result << encode_subrs

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      else

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        operands.each { |operand| result << encode_operand(operand) }

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      end

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      result << encode_operator(operator)

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    end

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  end

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end







    
      

  

  
    #finalize(private_dict_data)  ⇒ void 
  

  

  


  

    
This method returns an undefined value.
Finalize dict.



  





  

Parameters:








  Source Code
  
lib/ttfunk/table/cff/private_dict.rb, line 51

  
51
def finalize(private_dict_data)

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  return unless subr_index

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  encoded_subr_index = subr_index.encode

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  encoded_offset = encode_integer32(private_dict_data.length)

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

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  private_dict_data << encoded_subr_index

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end







    
      

  

  
    #nominal_width_x  ⇒ Integer 
  

  

  


  

    
Nominal Width X.



  





  


Returns:


    
  
    
  • 
      
      
        (Integer)
      
      
      
    
    • 
  







  Source Code
  
lib/ttfunk/table/cff/private_dict.rb, line 86

  
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def nominal_width_x

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  if (width = self[OPERATORS[:nominal_width_x]])

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    width.first

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  else

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    DEFAULT_WIDTH_X_NOMINAL

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  end

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end







    
      

  

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

  

  


  

    
Subroutine index.



  





  


Returns:







  Source Code
  
lib/ttfunk/table/cff/private_dict.rb, line 65

  
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def subr_index

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  @subr_index ||=

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    if (subr_offset = self[OPERATORS[:subrs]])

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      SubrIndex.new(file, table_offset + subr_offset.first)

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    end

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end