Class: Falu::Image

Inherits:
Object
  • Object
show all
Defined in:
lib/falu/image.rb

Instance Method Summary collapse

Constructor Details

#initialize(image) ⇒ Image

Returns a new instance of Image.



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# File 'lib/falu/image.rb', line 17

def initialize(image)
  @raw_image = image
  @image = image
end

Instance Method Details

#dither(colors = 3, filename: nil, scale: nil, unique: false) ⇒ Object 



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# File 'lib/falu/image.rb', line 114

def dither(colors=3, filename: nil, scale: nil, unique: false)
  filename ||= Tempfile.new(['dithered', '.png']).path
  scale ||= unique ? (colors * 10) : [width, height].max 

  args = [
    'convert', path,
    '+dither',
    '-colors', colors,
    (unique ? '-unique-colors' : nil),
    '-scale', scale,
    filename
  ].compact

  run_command(*args)
  self.class.new(filename)
end

#histogram ⇒ Object 



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# File 'lib/falu/image.rb', line 27

def histogram
  #hist = run_command("convert", "#{path}", "-format", "%c", "histogram:info:").split("\n")
  #return hist.first
  run_command("convert", "#{path}", "-format", "%c", "histogram:info:").split("\n").map do |clr|
    next unless match = clr.match(/\s*(\d+):\s+\((\d+,\d+,\d+)\)\s+(#[\da-fA-F]{6})\s+(.*)/)
    color = {
      count: match[1].to_i,
      rgb: match[2],
      hex: match[3].downcase
    }

    if block_given?
      yield(*(color.values + [color]))
    else
      color
    end
  end.compact.to_enum
end

#image ⇒ Object 



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# File 'lib/falu/image.rb', line 22

def image
  @image = MiniMagick::Image.open(@image) unless @image.is_a?(MiniMagick::Image)
  @image
end

#miro ⇒ Object 



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# File 'lib/falu/image.rb', line 92

def miro
  colors = Miro::DominantColors.new(@raw_image)
  hex = colors.to_hex
  pct = colors.by_percentage
  hex.each_with_index.map do |clr,idx|
    [clr, pct[idx] * 100]
  end
end

#pixels(x = 0, y = 0, w = nil, h = nil, size: 10, sample: nil, &block) ⇒ Object 



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# File 'lib/falu/image.rb', line 46

def pixels(x=0, y=0, w=nil, h=nil, size: 10, sample: nil, &block)
  w ||= width
  h ||= height

  (w / size).times.map do |ww|
    pw = (ww * size)
    px = x + pw

    (h / size).times.map do |hh|
      ph = (hh * size)
      py = y + ph

      pixels = run_command("convert", "#{path}[#{size}x#{size}+#{px}+#{py}]", "-depth", '8', "txt:").split("\n")
      sample = 1 if sample == true
      pixels = pixels.sample(sample) if sample

      pixels.map do |pxl|
        next unless match = pxl.match(/(\d+),(\d+):\s+\((\d+,\d+,\d+)\)\s+(#[\da-fA-F]{6})\s+(.*)/)

        pixel = {
          x: match[1].to_i + pw,
          y: match[2].to_i + ph,
          rgb: match[3],
          hex: match[4].downcase,
        }

        if block_given?
          yield(*(pixel.values + [pixel]))
        else
          pixel
        end
      end
    end
  end.flatten.to_enum
end

#sample(x = 0, y = 0, w = nil, h = nil, size: 10, sample: false, &block) ⇒ Object 



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# File 'lib/falu/image.rb', line 82

def sample(x=0, y=0, w=nil, h=nil, size: 10, sample: false, &block)
  palette = {}
  pixels(x, y, w, h, size: size, sample: sample) do |x,y,rgb,hex|
    palette[hex] ||= 0
    palette[hex] += 1
    yield(hex) if block_given?
  end
  palette.to_a.to_enum
end

#scale(scale, filename: nil) ⇒ Object 



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# File 'lib/falu/image.rb', line 101

def scale(scale, filename: nil)
  filename ||= Tempfile.new(['scaled', '.png']).path

  args = [
    'convert', path,
    '-scale', scale,
    filename
  ]

  run_command(*args)
  self.class.new(filename)
end