Class: TTFunk::Table::Hmtx

Inherits:
TTFunk::Table show all
Defined in:
lib/ttfunk/table/hmtx.rb

Overview

Horizontal Metrics (hmtx) table.

Defined Under Namespace

Classes: HorizontalMetric

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

#left_side_bearings ⇒ Array<Ingteger> (readonly)

Left side bearings.

Returns:

  • (Array<Ingteger>)
Source Code
lib/ttfunk/table/hmtx.rb, line 15
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def left_side_bearings

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  @left_side_bearings

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end

#metrics ⇒ Array<HorizontalMetric> (readonly)

Glyph horizontal metrics.

Returns:

Source Code
lib/ttfunk/table/hmtx.rb, line 11
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def metrics

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  @metrics

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end

#widths ⇒ Array<Integer> (readonly)

Glyph widths.

Returns:

  • (Array<Integer>)
Source Code
lib/ttfunk/table/hmtx.rb, line 19
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def widths

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  @widths

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end

Class Method Details

.encode(hmtx, mapping) ⇒ Hash{:number_of_metrics => Integer, :table => String}

Encode table.

Parameters:

  • hmtx (TTFunk::Table::Hmtx)
  • mapping (Hash{Integer => Integer}) —

    keys are new glyph IDs, values are old glyph IDs

Returns:

  • (Hash{:number_of_metrics => Integer, :table => String}) —
    • :number_of_metrics - number of mertrics is the table.
    • :table - encoded table.
Source Code
lib/ttfunk/table/hmtx.rb, line 29
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def self.encode(hmtx, mapping)

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  metrics =

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    mapping.keys.sort.map { |new_id|

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      metric = hmtx.for(mapping[new_id])

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      [metric.advance_width, metric.left_side_bearing]

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    }

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  {

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    number_of_metrics: metrics.length,

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    table: metrics.flatten.pack('n*'),

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  }

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end







    
  


  

    
Instance Method Details


    
      

  

  
    #for(glyph_id)  ⇒ HorizontalMetric 
  

  

  


  

    
Get horizontal metric for glyph.



  





  

Parameters:


    
  
    
  • 
      
        glyph_id
      
      
        (Integer)
      
      
      
    
    • 
  




Returns:







  Source Code
  
lib/ttfunk/table/hmtx.rb, line 54

  
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def for(glyph_id)

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  @metrics[glyph_id] ||

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    metrics_cache[glyph_id] ||=

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      HorizontalMetric.new(

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        @metrics.last.advance_width,

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        @left_side_bearings[glyph_id - @metrics.length],

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      )

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end