Class: Croppable::Crop

Inherits:
Object
  • Object
show all
Defined in:
lib/croppable/crop.rb

Instance Method Summary collapse

Constructor Details

#initialize(model, attr_name) ⇒ Crop

Returns a new instance of Crop.



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# File 'lib/croppable/crop.rb', line 6

def initialize(model, attr_name)
  @model     = model
  @attr_name = attr_name
  @data      = model.send("#{attr_name}_croppable_data")
  @setup     = model.send("#{attr_name}_croppable_setup")
end

Instance Method Details

#perform ⇒ Object 



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# File 'lib/croppable/crop.rb', line 13

def perform()
  @model.send("#{@attr_name}_original").open do |file|
    vips_img = Vips::Image.new_from_file(file.path)

    height = vips_img.height
    width  = vips_img.width

    x = ((width  - (width  * @data.scale)) / 2 + @data.x) * @setup[:scale]
    y = ((height - (height * @data.scale)) / 2 + @data.y) * @setup[:scale]

    background = @data.background_color.remove("#").scan(/\w{2}/).map {|color| color.to_i(16) }
    background_embed = background.dup
    background_embed << 255 if vips_img.bands == 4

    new_width  = @setup[:width]  * @setup[:scale]
    new_height = @setup[:height] * @setup[:scale]

    vips_img = vips_img.resize(@data.scale * @setup[:scale])
    vips_img = vips_img.embed(x, y, new_width, new_height, background: background_embed)

    path = Tempfile.new('cropped').path + ".jpg"

    vips_img.write_to_file(path, background: background, Q: 100)

    @model.send("#{ @attr_name }_cropped").attach(io: File.open(path), filename: "cropped")
  end
end