Class: Cul::Image::Properties::Tiff

Inherits:
Base
  • Object
show all
Defined in:
lib/cul_image_props/image/properties/types.rb

Constant Summary

Constants inherited from Base

Base::BASE_XML

Instance Attribute Summary

Attributes inherited from Base

#nodeset

Instance Method Summary collapse

Methods inherited from Base

#[], #add_dt_prop, #extent=, #format=, #hex_inspect, #length=, #ord_value, #sampling_unit=, #width=, #x_sampling_freq=, #y_sampling_freq=

Constructor Details

#initialize(srcfile = nil) ⇒ Tiff

Returns a new instance of Tiff.



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# File 'lib/cul_image_props/image/properties/types.rb', line 305

def initialize(srcfile=nil)
  super
  header_bytes = @src.read(14)
  case header_bytes[0...4].unpack('C*')
  when Cul::Image::Magic::TIFF_INTEL_LE
    @endian = header_bytes[12]
  when Cul::Image::Magic::TIFF_MOTOROLA_BE
    @endian = header_bytes[12]
  else
    raise "Source file is not a tiff #{hex_inspect(header_bytes[0...4])}" 
  end
  @src.rewind
  tags = Cul::Image::Properties::Exif.process_file(srcfile)
  if tags.include? 'Image ImageWidth'
    self.width= tags['Image ImageWidth'].values[0]
  end
  if tags.include? 'Image ImageLength'
    self.length= tags['Image ImageLength'].values[0]
  end
  if tags.include? 'Image XResolution'
    self.x_sampling_freq= tags['Image XResolution'].values[0].inspect
  end
  if tags.include? 'Image YResolution'
    self.y_sampling_freq= tags['Image YResolution'].values[0].inspect
  end
  if tags.include? 'Image ResolutionUnit'
    if (tags['Image ResolutionUnit'].values[0] == 3)
      self.sampling_unit=3
    elsif (tags['Image ResolutionUnit'].values[0] == 2)
      self.sampling_unit=2
    else
      self.sampling_unit=1
    end
  end
  # do stuff with tags
  self.extent= srcfile.stat.size unless srcfile.nil?
  self.format=MIME[:tif]
end