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Class: ActiveStorage::Analyzer::ImageAnalyzer

Relationships & Source Files
Namespace Children
Classes:
ImageMagick, Vips
Extension / Inclusion / Inheritance Descendants
Subclasses:
ImageMagick, Vips
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, ::ActiveStorage::Analyzer
Instance Chain:
self, ::ActiveStorage::Analyzer
Inherits: ActiveStorage::Analyzer
Defined in: activestorage/lib/active_storage/analyzer/image_analyzer.rb

Overview

Active Storage Image Analyzer

This is an abstract base class for image analyzers, which extract width and height from an image blob.

If the image contains EXIF data indicating its angle is 90 or 270 degrees, its width and height are swapped for convenience.

Example:

ActiveStorage::Analyzer::ImageAnalyzer::ImageMagick.new(blob).metadata
# => { width: 4104, height: 2736 }

Class Attribute Summary

::ActiveStorage::Analyzer - Inherited

.analyze_later?

Implement this method in concrete subclasses.

Class Method Summary

::ActiveStorage::Analyzer - Inherited

.accept?

Implement this method in a concrete subclass.
.new

Instance Attribute Summary

::ActiveStorage::Analyzer - Inherited

#blob

Instance Method Summary

::ActiveStorage::Analyzer - Inherited

#metadata

Override this method in a concrete subclass.
#download_blob_to_tempfile

Downloads the blob to a tempfile on disk.
#instrument, #logger, #tmpdir

Constructor Details

This class inherits a constructor from ActiveStorage::Analyzer

Class Method Details

.accept?(blob) ⇒ Boolean

[ GitHub ] 

  


# File 'activestorage/lib/active_storage/analyzer/image_analyzer.rb', line 15



def self.accept?(blob)
  blob.image?
end


  







Instance Method Details



  

    #metadata  
  

  [ GitHub ]


  

  


# File 'activestorage/lib/active_storage/analyzer/image_analyzer.rb', line 19



def metadata
  read_image do |image|
    if rotated_image?(image)
      { width: image.height, height: image.width }
    else
      { width: image.width, height: image.height }
    end
  end
end