Class: DragonflyLibvips::Processors::Thumb

Inherits:
Object
  • Object
show all
Defined in:
lib/dragonfly_libvips/processors/thumb.rb

Constant Summary collapse

OPERATORS = 
'><'.freeze
RESIZE_GEOMETRY =

e.g. ‘300x200>’

/\A\d*x\d*[#{OPERATORS}]?\z/
DPI = 
300

Instance Method Summary collapse

Instance Method Details

#call(content, geometry, options = {}) ⇒ Object

Raises:



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# File 'lib/dragonfly_libvips/processors/thumb.rb', line 11

def call(content, geometry, options = {})
  raise UnsupportedFormat unless content.ext
  raise UnsupportedFormat unless SUPPORTED_FORMATS.include?(content.ext.downcase)

  options = DragonflyLibvips.stringify_keys(options)

  filename = content.path
  format = options.fetch('format', content.ext).to_s

  input_options = options.fetch('input_options', {})
  input_options['access'] = input_options.fetch('access', 'sequential')
  input_options['autorotate'] = input_options.fetch('autorotate', true) if content.mime_type == 'image/jpeg'

  if content.mime_type == 'application/pdf'
    input_options['dpi'] = input_options.fetch('dpi', DPI)
    input_options['page'] = input_options.fetch('page', 0)
  else
    input_options.delete('page')
    input_options.delete('dpi')
  end

  output_options = options.fetch('output_options', {})
  if FORMATS_WITHOUT_PROFILE_SUPPORT.include?(format)
    output_options.delete('profile')
  else
    output_options['profile'] ||= input_options.fetch('profile', EPROFILE_PATH)
  end
  output_options.delete('Q') unless format.to_s =~ /jpg|jpeg/i
  output_options['format'] ||= format.to_s if format.to_s =~ /gif|bmp/i

  input_options = input_options.each_with_object({}) { |(k, v), memo| memo[k.to_sym] = v } # symbolize
  img = ::Vips::Image.new_from_file(filename, DragonflyLibvips.symbolize_keys(input_options))

  dimensions = case geometry
               when RESIZE_GEOMETRY then Dimensions.call(geometry, img.width, img.height)
               else raise ArgumentError, "Didn't recognise the geometry string: #{geometry}"
  end

  thumbnail_options = options.fetch('thumbnail_options', {})
  if Vips.at_least_libvips?(8, 8)
    thumbnail_options['no_rotate'] = input_options.fetch('no_rotate', false) if content.mime_type == 'image/jpeg'
  else
    thumbnail_options['auto_rotate'] = input_options.fetch('autorotate', true) if content.mime_type == 'image/jpeg'
  end
  thumbnail_options['height'] = thumbnail_options.fetch('height', dimensions.height.ceil)
  thumbnail_options['import_profile'] = CMYK_PROFILE_PATH if img.get('interpretation') == :cmyk
  thumbnail_options['size'] ||= case geometry
                               when />\z/ then :down # do_not_resize_if_image_smaller_than_requested
                               when /<\z/ then :up # do_not_resize_if_image_larger_than_requested
                               else :both
  end

  filename += "[page=#{input_options[:page]}]" if content.mime_type == 'application/pdf'

  thumbnail_options = thumbnail_options.each_with_object({}) { |(k, v), memo| memo[k.to_sym] = v } # symbolize
  thumb = ::Vips::Image.thumbnail(filename, dimensions.width.ceil, DragonflyLibvips.symbolize_keys(thumbnail_options))

  content.update(
    thumb.write_to_buffer(".#{format}", DragonflyLibvips.symbolize_keys(output_options)),
    'name' => "temp.#{format}",
    'format' => format
  )
  content.ext = format
end

#update_url(url_attributes, _, options = {}) ⇒ Object 



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# File 'lib/dragonfly_libvips/processors/thumb.rb', line 76

def update_url(url_attributes, _, options = {})
  options = options.each_with_object({}) { |(k, v), memo| memo[k.to_s] = v } # stringify keys
  return unless format = options.fetch('format', nil)
  url_attributes.ext = format
end