Method: Color::Palette::AdobeColor#initialize

Defined in:
lib/color/palette/adobecolor.rb

#initialize(palette) ⇒ AdobeColor

Create a new AdobeColor palette from the palette file as a string.

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# File 'lib/color/palette/adobecolor.rb', line 46

def initialize(palette)
  @colors     = []
  @names      = {}
  @statistics = Hash.new(0)
  @lost       = []
  @order      = []
  @version    = nil

  class << palette
    def readwords(count = 1)
      @offset ||= 0
      raise IndexError if @offset >= self.size
      val = self[@offset, count * 2]
      raise IndexError if val.nil? or val.size < (count * 2)
      val = val.unpack("n" * count)
      @offset += count * 2
      val
    end

    def readutf16(count = 1)
      @offset ||= 0
      raise IndexError if @offset >= self.size
      val = self[@offset, count * 2]
      raise IndexError if val.nil? or val.size < (count * 2)
      @offset += count * 2
      val
    end
  end

  @version, count = palette.readwords 2

  raise "Unknown AdobeColor palette version #@version." unless @version.between?(1, 2)

  count.times do
    space, w, x, y, z = palette.readwords 5
    name = nil
    if @version == 2
      raise IndexError unless palette.readwords == [ 0 ]
      len = palette.readwords
      name = palette.readutf16(len[0] - 1)
      raise IndexError unless palette.readwords == [ 0 ]
    end

    color = case space
            when 0 then # RGB
              @statistics[:rgb] += 1

              Color::RGB.new(w / 256, x / 256, y / 256)
            when 1 then # HS[BV] -- Convert to RGB
              @statistics[:hsb] += 1

              h = w / 65535.0
              s = x / 65535.0
              v = y / 65535.0

              if defined?(Color::HSB)
                Color::HSB.from_fraction(h, s, v)
              else
                @statistics[:converted] += 1
                if Color.near_zero_or_less?(s)
                  Color::RGB.from_fraction(v, v, v)
                else
                  if Color.near_one_or_more?(h)
                    vh = 0
                  else
                    vh = h * 6.0
                  end

                  vi = vh.floor
                  v1 = v.to_f * (1 - s.to_f)
                  v2 = v.to_f * (1 - s.to_f * (vh - vi))
                  v3 = v.to_f * (1 - s.to_f * (1 - (vh - vi)))

                  case vi
                  when 0 then Color::RGB.from_fraction(v, v3, v1)
                  when 1 then Color::RGB.from_fraction(v2, v, v1)
                  when 2 then Color::RGB.from_fraction(v1, v, v3)
                  when 3 then Color::RGB.from_fraction(v1, v2, v)
                  when 4 then Color::RGB.from_fraction(v3, v1, v)
                  else Color::RGB.from_fraction(v, v1, v2)
                  end
                end
              end
            when 2 then # CMYK
              @statistics[:cmyk] += 1
              Color::CMYK.from_percent(100 - (w / 655.35),
                                       100 - (x / 655.35),
                                       100 - (y / 655.35),
                                       100 - (z / 655.35))
            when 7 then # L*a*b*
              @statistics[:lab] += 1

              l = [w, 10000].min / 100.0
              a = [[-12800, UwToSw[x]].max, 12700].min / 100.0
              b = [[-12800, UwToSw[x]].max, 12700].min / 100.0

              if defined? Color::Lab
                Color::Lab.new(l, a, b)
              else
                [ space, w, x, y, z ]
              end
            when 8 then # Grayscale
              @statistics[:gray] += 1

              g = [w, 10000].min / 100.0
              Color::GrayScale.new(g)
            when 9 then # Wide CMYK
              @statistics[:wcmyk] += 1

              c = [w, 10000].min / 100.0
              m = [x, 10000].min / 100.0
              y = [y, 10000].min / 100.0
              k = [z, 10000].min / 100.0
              Color::CMYK.from_percent(c, m, y, k)
            else
              @statistics[space] += 1
              [ space, w, x, y, z ]
            end

    @order << [ color, name ]

    if color.kind_of? Array
      @lost << color
    else
      @colors << color

      if name
        @names[name] ||= []
        @names[name] << color
      end
    end
  end
end