Class: VIPS::TIFFWriter

Inherits:
Writer
  • Object
show all
Defined in:
lib/vips/writer.rb,
ext/writer.c

Constant Summary collapse

COMPRESSION = 
[:none, :jpeg, :deflate, :packbits, :ccittfax4, :lzw]
PREDICTOR = 
[:none, :horizontal_differencing, :floating_point]
LAYOUT = 
[:strip, :tile]
MULTI_RES = 
[:flat, :pyramid]
FORMAT = 
[:manybit, :onebit]
RESOLUTION_UNITS = 
[:cm, :inch]

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Writer

#exif=, #icc=, #image, #remove_exif, #remove_icc

Methods included from Header

#band_fmt, #bands, #exif, #exif?, #get, #icc, #icc?, #n_elements, #set, #sizeof_element, #sizeof_line, #sizeof_pel, #x_offset, #x_res, #x_size, #y_offset, #y_res, #y_size

Constructor Details

#initialize(image, options = {}) ⇒ TIFFWriter

Returns a new instance of TIFFWriter.



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# File 'lib/vips/writer.rb', line 142

def initialize(image, options={})
  super image

  @compression = :none
  @quality = 75
  @predictor = :none
  @layout = :strip
  @tile_size = [128, 128]
  @multi_res = :flat
  @format = :manybit
  @resolution_units = :cm

  [ :compression, :layout, :multi_res, :format, :resolution_units,
    :resolution, :predictor, :quality, :tile_size ].each do |att|
    self.send "#{att}=".to_sym, options[att] if options.has_key?(att)
  end
end

Instance Attribute Details

#compression ⇒ Object

Returns the value of attribute compression.



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# File 'lib/vips/writer.rb', line 132

def compression
  @compression
end

#format ⇒ Object

Returns the value of attribute format.



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# File 'lib/vips/writer.rb', line 132

def format
  @format
end

#layout ⇒ Object

Returns the value of attribute layout.



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# File 'lib/vips/writer.rb', line 132

def layout
  @layout
end

#multi_res ⇒ Object

Returns the value of attribute multi_res.



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# File 'lib/vips/writer.rb', line 132

def multi_res
  @multi_res
end

#predictor ⇒ Object

Returns the value of attribute predictor.



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# File 'lib/vips/writer.rb', line 132

def predictor
  @predictor
end

#quality ⇒ Object

Returns the value of attribute quality.



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# File 'lib/vips/writer.rb', line 132

def quality
  @quality
end

#resolution ⇒ Object

Returns the value of attribute resolution.



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# File 'lib/vips/writer.rb', line 132

def resolution
  @resolution
end

#resolution_units ⇒ Object

Returns the value of attribute resolution_units.



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# File 'lib/vips/writer.rb', line 132

def resolution_units
  @resolution_units
end

#tile_size ⇒ Object

Returns the value of attribute tile_size.



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# File 'lib/vips/writer.rb', line 132

def tile_size
  @tile_size
end

Instance Method Details

#compression_str ⇒ Object 



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# File 'lib/vips/writer.rb', line 165

def compression_str
  case @compression
  when :jpeg then "#{@compression}:#{@quality}"
  when :lzw, :deflate then "#{@compression}:#{@predictor}"
  else @compression
  end
end

#layout_str ⇒ Object 



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# File 'lib/vips/writer.rb', line 173

def layout_str
  s = @layout
  s << ":#{@tile_size.join 'x'}" if @layout == :tile
  s
end

#resolution_str ⇒ Object 



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# File 'lib/vips/writer.rb', line 179

def resolution_str
  s = "res_#{@resolution_units}"
  s << ":#{@resolution.join 'x'}" if @resolution
  s
end

#write(path) ⇒ Object 



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# File 'lib/vips/writer.rb', line 160

def write(path)
  opts = [compression_str, layout_str, @multi_res, @format, resolution_str].join ','
  write_gc "#{path}:#{opts}"
end