Class: ActiveStorage::Analyzer::ImageAnalyzer

Inherits:
ActiveStorage::Analyzer show all
Defined in:
lib/active_storage/analyzer/image_analyzer.rb

Overview

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 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)
[View source]

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# File 'lib/active_storage/analyzer/image_analyzer.rb', line 13

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

Instance Method Details

#metadata ⇒ Object

[View source]

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# File 'lib/active_storage/analyzer/image_analyzer.rb', line 17

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