Class: Hydra::Derivatives::Processors::Jpeg2kImage

Inherits:
Processor
  • Object
show all
Includes:
ShellBasedProcessor
Defined in:
lib/hydra/derivatives/processors/jpeg2k_image.rb

Constant Summary

Constants included from ShellBasedProcessor

ShellBasedProcessor::BLOCK_SIZE

Instance Attribute Summary

Attributes inherited from Processor

#directives, #output_file_service, #source_path

Instance Method Summary collapse

Methods included from ShellBasedProcessor

#options_for, #output_file

Methods inherited from Processor

#initialize, #output_file, #output_file_id, #output_filename_for

Constructor Details

This class inherits a constructor from Hydra::Derivatives::Processors::Processor

Instance Method Details

#encode_file(recipe, opts = {}) ⇒ Object 



25
26
27
28
29
30
31
32
33
34
35
36
 
# File 'lib/hydra/derivatives/processors/jpeg2k_image.rb', line 25

def encode_file(recipe, opts={})
  output_file = self.class.tmp_file('.jp2')
  if opts[:file_path]
    self.class.encode(opts[:file_path], recipe, output_file)
  else
    Hydra::Derivatives::TempfileService.create(source_file) do |f|
      self.class.encode(f.path, recipe, output_file)
    end
  end
  output_file_service.call(File.open(output_file, 'rb'), directives)
  File.unlink(output_file)
end

#process ⇒ Object 



9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
 
# File 'lib/hydra/derivatives/processors/jpeg2k_image.rb', line 9

def process
  image = MiniMagick::Image.open(source_path)
  quality = image['%[channels]'] == 'gray' ? 'gray' : 'color'
  name = directives.fetch(:label)
  long_dim = self.class.long_dim(image)
  file_path = self.class.tmp_file('.tif')
  to_srgb = directives.fetch(:to_srgb, true)
  if directives[:resize] || to_srgb
    preprocess(image, resize: directives[:resize], to_srgb: to_srgb, src_quality: quality)
  end
  image.write file_path
  recipe = self.class.kdu_compress_recipe(directives, quality, long_dim)
  encode_file(recipe, file_path: file_path)
  File.unlink(file_path) unless file_path.nil?
end