Class: ActiveStorage::Analyzer::ImageAnalyzer

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

Overview

Extracts width and height in pixels 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.new(blob).metadata
# => { width: 4104, height: 2736 }

This analyzer relies on the third-party MiniMagick gem. MiniMagick requires the ImageMagick system library.

Instance Attribute Summary

Attributes inherited from ActiveStorage::Analyzer

#blob

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from ActiveStorage::Analyzer

#initialize

Constructor Details

This class inherits a constructor from ActiveStorage::Analyzer

Class Method Details

.accept?(blob) ⇒ Boolean

Returns:

  • (Boolean) 


16
17
18
 
# File 'lib/active_storage/analyzer/image_analyzer.rb', line 16

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

Instance Method Details

#metadata ⇒ Object 



20
21
22
23
24
25
26
27
28
 
# File 'lib/active_storage/analyzer/image_analyzer.rb', line 20

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