Class: PDF::Reader::WidthCalculator::Composite

Inherits:
Object
  • Object
show all
Defined in:
lib/pdf/reader/width_calculator/composite.rb

Overview

CIDFontType0 or CIDFontType2 use DW (integer) and W (array) to determine codepoint widths, note that CIDFontType2 will contain a true type font program which could be used to calculate width, however, a conforming writer is supposed to convert the widths for the codepoints used into the W array so that it can be used. see Section 9.7.4.1, PDF 32000-1:2008, pp 269-270

Instance Method Summary collapse

Constructor Details

#initialize(font) ⇒ Composite

Returns a new instance of Composite.



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# File 'lib/pdf/reader/width_calculator/composite.rb', line 15

def initialize(font)
  @font = font
  @widths = PDF::Reader::CidWidths.new(@font.cid_default_width, @font.cid_widths)
end

Instance Method Details

#glyph_width(code_point) ⇒ Object 



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# File 'lib/pdf/reader/width_calculator/composite.rb', line 20

def glyph_width(code_point)
  return 0 if code_point.nil? || code_point < 0

  w = @widths[code_point]
  # 0 is a valid width
  if w
    w.to_f
  else
    0
  end
end