Class: Chico::Extractor

Inherits:
Object
  • Object
show all
Defined in:
lib/chico/extractor.rb

Overview

Extracts icons images (bmp / png) from an .ico file

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(bin) ⇒ Extractor

Returns a new instance of Extractor.



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# File 'lib/chico/extractor.rb', line 7

def initialize(bin)
  @sio = StringIO.new(bin, 'rb')
  @entries = []
  parse_icondir
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sym, *args, &block) ⇒ Object

Add support for retrieving images by their size, e.g. 32x32, 16x16, etc.



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# File 'lib/chico/extractor.rb', line 24

def method_missing(sym, *args, &block)
  if sym.to_s =~ /^(\d+)x(\d+)$/
    image_by_size $1, $2
  else
    super
  end
end

Instance Attribute Details

#entries ⇒ Object (readonly)

Returns the value of attribute entries.



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# File 'lib/chico/extractor.rb', line 5

def entries
  @entries
end

Instance Method Details

#image_for(entry) ⇒ Object 



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# File 'lib/chico/extractor.rb', line 42

def image_for(entry)
  extract_image(entry)
end

#image_sizes ⇒ Object

Returns the sizes of the images packed in this icon, as width, height pairs, sorted from smallest to largest width



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# File 'lib/chico/extractor.rb', line 19

def image_sizes
  @entries.map {|e| [e[:width], e[:height]] }.sort
end

#largest ⇒ Object 



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# File 'lib/chico/extractor.rb', line 32

def largest
  w, h = image_sizes.last
  self.send "#{w}x#{h}".to_sym
end

#num_images ⇒ Object 



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# File 'lib/chico/extractor.rb', line 13

def num_images
  @entries.size
end

#smallest ⇒ Object 



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# File 'lib/chico/extractor.rb', line 37

def smallest
  w, h = image_sizes.first
  self.send "#{w}x#{h}".to_sym
end