class HexaPDF::Type::FontDescriptor

See: PDF2.0 s9.8
whole.
This class specifies metrics and other attributes of a simple font or a CID font as a

def perform_validation #:nodoc:

:nodoc: 
def perform_validation #:nodoc:
  super
  if [self[:FontFile], self[:FontFile2], self[:FontFile3]].compact.size > 1
    yield("Only one of /FontFile, /FontFile2 or /FontFile3 may be set", false)
  end
  font_weight = self[:FontWeight]
  if font_weight && !ALLOWED_FONT_WEIGHTS.include?(font_weight)
    yield("Field FontWeight does not contain an allowed value", true)
    delete(:FontWeight)
  end
  descent = self[:Descent]
  if descent && descent > 0
    yield("The /Descent value needs to be a negative number", true)
    self[:Descent] = -descent
  end
end