Class: Riiif::VipsInfoExtractor

Inherits:
AbstractInfoExtractor show all
Defined in:
app/extractors/riiif/vips_info_extractor.rb

Overview

Get information using (lib)vips to interrogate the file

Instance Method Summary collapse

Methods inherited from AbstractInfoExtractor

#initialize

Constructor Details

This class inherits a constructor from Riiif::AbstractInfoExtractor

Instance Method Details

#extract ⇒ Object 



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# File 'app/extractors/riiif/vips_info_extractor.rb', line 8

def extract
  attributes = Riiif::CommandRunner.execute("#{external_command} '#{@path}' -a")
                                   .split(/\n/)
                                   .map { |str| str.strip.split(': ') }.to_h
  width, height = attributes.values_at("width", "height")

  {
    height: Integer(height),
    width: Integer(width),
    format: attributes["vips-loader"].match?("pngload") ? "PNG" : "JPEG",
    channels: ::Vips::Image.new_from_file(@path.to_s).has_alpha? ? "srgba" : "srgb"
  }
end