Class: ActiveStorage::Analyzer::ImageAnalyzer

Inherits:
ActiveStorage::Analyzer show all
Extended by:
ActiveSupport::Autoload
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 }

Direct Known Subclasses

ImageMagick, Vips

Defined Under Namespace

Classes: ImageMagick, Vips

Instance Attribute Summary

Attributes inherited from ActiveStorage::Analyzer

#blob

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ActiveSupport::Autoload

autoload, autoload_at, autoload_under, eager_autoload, eager_load!

Methods inherited from ActiveStorage::Analyzer

analyze_later?, #initialize

Constructor Details

This class inherits a constructor from ActiveStorage::Analyzer

Class Method Details

.accept?(blob) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'activestorage/lib/active_storage/analyzer/image_analyzer.rb', line 20

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

Instance Method Details

#metadata ⇒ Object 



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# File 'activestorage/lib/active_storage/analyzer/image_analyzer.rb', line 24

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