class Gitpaint::PNGRenderer
Public Class Methods
invert(value)
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# File lib/gitpaint/png_renderer.rb, line 21 def self.invert value 256 - value end
magnitude(value)
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# File lib/gitpaint/png_renderer.rb, line 17 def self.magnitude value value / 256 ** 3 end
new(png_path)
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# File lib/gitpaint/png_renderer.rb, line 5 def initialize png_path png = ChunkyPNG::Image.from_file png_path png.height.times do |i| self.push( png.row(i).to_a.map do |p| self.class.scale self.class.invert self.class.magnitude p end ) end end
scale(value)
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# File lib/gitpaint/png_renderer.rb, line 25 def self.scale value value / (256 / 5) end