Class: TTFunk::Table::Post

Inherits:
TTFunk::Table show all
Defined in:
lib/ttfunk/table/post.rb,
lib/ttfunk/table/post/format10.rb,
lib/ttfunk/table/post/format20.rb,
lib/ttfunk/table/post/format30.rb,
lib/ttfunk/table/post/format40.rb

Overview

PostScript (post) table.

This class can be extended with version-specific modules.

See Also:

Defined Under Namespace

Modules: Format10, Format20, Format30, Format40

Instance Attribute Summary collapse

Attributes inherited from TTFunk::Table

#file, #length, #offset

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from TTFunk::Table

#exists?, #initialize, #raw, #tag

Constructor Details

This class inherits a constructor from TTFunk::Table

Instance Attribute Details

#fixed_pitch ⇒ Integer (readonly)

0 if the font is proportionally spaced, non-zero if the font is not proportionally spaced.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/post.rb, line 35
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def fixed_pitch

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  @fixed_pitch

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end

#format ⇒ Integer (readonly)

Table version.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/post.rb, line 18
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def format

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  @format

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end

#italic_angle ⇒ Integer (readonly)

Italic angle in counter-clockwise degrees from the vertical.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/post.rb, line 22
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def italic_angle

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  @italic_angle

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end

#max_mem_type1 ⇒ Integer (readonly)

Maximum memory usage when an OpenType font is downloaded as a Type 1 font.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/post.rb, line 53
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def max_mem_type1

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  @max_mem_type1

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end

#max_mem_type42 ⇒ Integer (readonly)

Maximum memory usage when an OpenType font is downloaded.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/post.rb, line 43
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def max_mem_type42

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  @max_mem_type42

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end

#min_mem_type1 ⇒ Integer (readonly)

Minimum memory usage when an OpenType font is downloaded as a Type 1 font.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/post.rb, line 48
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def min_mem_type1

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  @min_mem_type1

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end

#min_mem_type42 ⇒ Integer (readonly)

Minimum memory usage when an OpenType font is downloaded.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/post.rb, line 39
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def min_mem_type42

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  @min_mem_type42

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end

#subtable ⇒ TTFunk::Table::Post::Format10, ... (readonly)

Version-specific fields.

Returns:

Source Code
lib/ttfunk/table/post.rb, line 58
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def subtable

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  @subtable

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end

#underline_position ⇒ Integer (readonly)

Suggested distance of the top of the underline from the baseline

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/post.rb, line 26
26
def underline_position

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  @underline_position

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end

#underline_thickness ⇒ Integer (readonly)

Suggested values for the underline thickness.

Returns:

  • (Integer)
Source Code
lib/ttfunk/table/post.rb, line 30
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def underline_thickness

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  @underline_thickness

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end

Class Method Details

.encode(post, mapping) ⇒ String?

Encode table.

Parameters:

  • post (TTFunk::Table::Post)
  • mapping (Hash{Integer => Integer}) —

    keys are new glyph IDs, values are old glyph IDs

Returns:

  • (String, nil)
Source Code
lib/ttfunk/table/post.rb, line 66
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def self.encode(post, mapping)

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  return if post.nil?

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  post.recode(mapping)

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end







    
  


  

    
Instance Method Details


    
      

  

  
    #fixed_pitch?  ⇒ Boolean 
  

  

  


  

    
Is this font monospaced?



  





  


Returns:


    
  
    
  • 
      
      
        (Boolean)
      
      
      
    
    • 
  







  Source Code
  
lib/ttfunk/table/post.rb, line 75

  
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def fixed_pitch?

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  @fixed_pitch != 0

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end







    
      

  

  
    #glyph_for(_code)  ⇒ String 
  

  

  


  

    
Get glyph name for character code.



This is a placeholder.



  





  

Parameters:


    
  
    
  • 
      
        _code
      
      
        (Integer)
      
      
      
    
    • 
  




Returns:


    
  
    
  • 
      
      
        (String)
      
      
      
    
    • 
  







  Source Code
  
lib/ttfunk/table/post.rb, line 85

  
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def glyph_for(_code)

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  '.notdef'

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end







    
      

  

  
    #recode(mapping)  ⇒ String 
  

  

  


  

    
Re-encode this table.



  





  

Parameters:


    
  
    
  • 
      
        mapping
      
      
        (Hash{Integer => Integer})
      
      
      
        —
        
    keys are new glyph IDs, values
are old glyph IDs
    

    
      
    
    • 
  




Returns:


    
  
    
  • 
      
      
        (String)
      
      
      
    
    • 
  







  Source Code
  
lib/ttfunk/table/post.rb, line 94

  
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def recode(mapping)

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  return raw if format == 0x00030000

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  table = raw[0, 32]

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  table[0, 4] = [0x00020000].pack('N')

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  index = []

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  strings = []

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  mapping.keys.sort.each do |new_id|

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    post_glyph = glyph_for(mapping[new_id])

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    position = Format10::POSTSCRIPT_GLYPHS.index(post_glyph)

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    if position

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      index << position

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    else

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      index << (257 + strings.length)

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      strings << post_glyph

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    end

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  end

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  table << [mapping.length, *index].pack('n*')

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  strings.each do |string|

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    table << [string.length, string].pack('CA*')

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  end

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  table

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end