Class: Spittle::ImageData

Inherits:
Object
  • Object
show all
Defined in:
lib/spittle/image_data.rb

Constant Summary collapse

RGB_WIDTH = 
3
RGBA_WIDTH = 
4

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ ImageData

Returns a new instance of ImageData.



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# File 'lib/spittle/image_data.rb', line 8

def initialize(options = {})
  @data = (options.delete :data) || []
  @properties = options
end

Instance Method Details

#<<(row) ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 103

def <<(row)
  @data << row
  self
end

#==(other) ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 124

def == (other)
  @data == other
end

#[](row) ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 75

def [](row)
  @data[row]
end

#[]=(idx, row_data) ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 79

def []=(idx, row_data)
  @data[idx] = row_data
end

#compatible?(image) ⇒ Boolean

need better checks, because currently compatible is similar color type, or depth.. maybe it doesn’t matter…

Returns:

  • (Boolean) 


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# File 'lib/spittle/image_data.rb', line 20

def compatible?(image)
  self.pixel_width == image.pixel_width
end

#each(&block) ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 108

def each(&block)
  @data.each &block
end

#each_with_index(&block) ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 112

def each_with_index(&block)
  @data.each_with_index(&block)
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/spittle/image_data.rb', line 87

def empty?
  @data.empty?
end

#fill_to_height(desired_height) ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 42

def fill_to_height( desired_height )
  return self if desired_height == height

  img = ImageData.new(@properties.merge(:data => @data.clone))
  empty_row = [0] * ( scanline_width )

  ( desired_height - height ).times do
    img << empty_row
  end
  img
end

#flatten! ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 116

def flatten!
  @data.flatten!
end

#height ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 91

def height
  size
end

#last ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 99

def last
  @data.last
end

#last_scanline(idx) ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 28

def last_scanline(idx)
  last_row_index = idx - 1
  (last_row_index < 0 ? [] : @data[last_row_index])
end

#merge_left(other) ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 33

def merge_left( other )
  merged = ImageData.new(@properties.merge(:scanline_width => self.scanline_width + other.scanline_width,
                                           :name => "#{self.name}_#{other.name}"))
  other.each_with_index do |row, idx|
    merged[idx] = row + self[idx]
  end
  merged
end

#name ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 13

def name; @properties[:name] || "default"; end

#pack(*args) ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 120

def pack(*args)
  @data.pack(*args)
end

#pixel_width ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 16

def pixel_width; @properties[:pixel_width]; end

#scanline(row) ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 83

def scanline(row)
  self[row]
end

#scanline_width ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 14

def scanline_width; @properties[:scanline_width]; end

#size ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 95

def size
  @data.size
end

#to_rgba(alpha_value = 255) ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 54

def to_rgba( alpha_value=255 )
  # test that conversion updates pixel width, scanline width

  return self if pixel_width == RGBA_WIDTH

  # so ruby 1.9 has different ideas then 1.8 on how Enumerable should work
  # 1.9 returns Enumerable object if no block given
  # 1.8 complains if no block, unless using enum_x methods
  slice_method = (RUBY_VERSION.include?( "1.9" )) ? :each_slice : :enum_slice

  rgba_data = @data.map do |row|
    pixels = row.send( slice_method, RGB_WIDTH )
    pixels.inject([]){|result, pixel| result + pixel + [alpha_value] }
  end

  ImageData.new( :data => rgba_data,
                 :pixel_width => 4,
                 :scanline_width => (@properties[:scanline_width] / RGB_WIDTH) * RGBA_WIDTH,
                 :name => name)
end

#to_s ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 24

def to_s
  "#{name} pixel width: #{pixel_width}"
end

#width ⇒ Object 



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# File 'lib/spittle/image_data.rb', line 15

def width; scanline_width / pixel_width; end