Class: Morandi::SrgbConversion

Inherits:
Object
  • Object
show all
Defined in:
lib/morandi/srgb_conversion.rb

Overview

Converts the file under path to sRGB colour space

Class Method Summary collapse

Class Method Details

.default_icc_path(path) ⇒ Object 



24
25
26
 
# File 'lib/morandi/srgb_conversion.rb', line 24

def self.default_icc_path(path)
  "#{path}.icc.jpg"
end

.perform(path) ⇒ Object

Performs a conversion to srgb colour space if possible Returns a path to converted file on success or nil on failure



10
11
12
13
14
15
16
17
18
19
20
21
22
 
# File 'lib/morandi/srgb_conversion.rb', line 10

def self.perform(path)
  return unless suitable_for_jpegicc?(path)

  icc_file_path = default_icc_path(path)
  system('jpgicc', '-q97', path, icc_file_path, out: '/dev/null', err: '/dev/null')

  unless valid_jpeg?(icc_file_path)
    FileUtils.rm_f(icc_file_path) # jpgicc likes to leave an empty file after failing
    return
  end

  icc_file_path
end

.suitable_for_jpegicc?(path) ⇒ Boolean

Returns:

  • (Boolean) 


39
40
41
 
# File 'lib/morandi/srgb_conversion.rb', line 39

def self.suitable_for_jpegicc?(path)
  valid_jpeg?(path)
end

.valid_jpeg?(path) ⇒ Boolean

Returns:

  • (Boolean) 


28
29
30
31
32
33
34
35
36
37
 
# File 'lib/morandi/srgb_conversion.rb', line 28

def self.valid_jpeg?(path)
  return false unless File.exist?(path)
  return false unless File.size(path).positive?

  type, = GdkPixbuf::Pixbuf.get_file_info(path)

  type && type.name.eql?('jpeg')
rescue StandardError
  false
end