Class: DynamicImage::ImageReader

Inherits:
Object
  • Object
show all
Defined in:
lib/dynamic_image/image_reader.rb

Constant Summary collapse

HEADER_BYTES = 
12

Instance Method Summary collapse

Constructor Details

#initialize(data) ⇒ ImageReader

Returns a new instance of ImageReader.



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# File 'lib/dynamic_image/image_reader.rb', line 7

def initialize(data)
  @data = data
end

Instance Method Details

#format ⇒ Object 



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# File 'lib/dynamic_image/image_reader.rb', line 11

def format
  DynamicImage::Format.sniff(file_header)
end

#read ⇒ Object

Raises:



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# File 'lib/dynamic_image/image_reader.rb', line 15

def read
  raise DynamicImage::Errors::InvalidHeader unless valid_header?

  if @data.is_a?(String)
    Vips::Image.new_from_buffer(@data, option_string)
  else
    path = @data.is_a?(Pathname) ? @data.to_s : @data.path
    Vips::Image.new_from_file(path + option_string, access: :random)
  end
end

#valid_header? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dynamic_image/image_reader.rb', line 26

def valid_header?
  format ? true : false
end