Class: Dimscan::BaseScanner

Inherits:
Object
  • Object
show all
Includes:
Abstractize
Defined in:
lib/dimscan/base_scanner.rb

Overview

The abstract base class

Direct Known Subclasses

JPEGScanner, PNGScanner

Instance Method Summary collapse

Constructor Details

#initialize(url) ⇒ BaseScanner

Returns a new instance of BaseScanner.



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# File 'lib/dimscan/base_scanner.rb', line 11

def initialize(url)
  @bytes = HTTPByteEnumerator.new(url)
  @fallback_file = `mktemp`.chomp
end

Instance Method Details

#scan_dimensions ⇒ Object 



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# File 'lib/dimscan/base_scanner.rb', line 16

def scan_dimensions
  dimensions = nil
  File.open(@fallback_file, 'wb') do |file|
    dimensions = scan(@bytes.each) { |b| file.write(b) }
  end
  width, height = (
    dimensions || MiniMagick::Image.new(@fallback_file).dimensions
  )

  File.delete(@fallback_file)
  { width: width, height: height }
end