Class: Capybara::Screenshot::Diff::ImageCompare

Inherits:
Object
  • Object
show all
Includes:
ChunkyPNG::Color
Defined in:
lib/capybara/screenshot/diff/image_compare.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(old_file_name, new_file_name, dimensions = nil) ⇒ ImageCompare

Returns a new instance of ImageCompare.



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# File 'lib/capybara/screenshot/diff/image_compare.rb', line 13

def initialize(old_file_name, new_file_name, dimensions = nil)
  @old_file_name = old_file_name
  @file_name = new_file_name
  @dimensions = dimensions
end

Class Method Details

.compare(*args) ⇒ Object 



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# File 'lib/capybara/screenshot/diff/image_compare.rb', line 9

def self.compare(*args)
  new(*args).compare
end

Instance Method Details

#compare ⇒ Object 



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# File 'lib/capybara/screenshot/diff/image_compare.rb', line 19

def compare
  name = @file_name.chomp('.png')
  org_file_name = "#{name}_0.png~"
  new_file_name = "#{name}_1.png~"

  return nil unless File.exist? @old_file_name

  images = load_images(@old_file_name, @file_name)

  unless images
    clean_tmp_files(new_file_name, org_file_name)
    return false
  end

  crop_images(images, @dimensions) if @dimensions
  org_img = images.first
  new_img = images.last
  if sizes_changed?(org_img, new_img, name)
    save_images(new_file_name, new_img, org_file_name, org_img)
    return true
  end

  if org_img.pixels == new_img.pixels
    clean_tmp_files(new_file_name, org_file_name)
    return false
  end

  @left, @top, @right, @bottom = find_diff_rectangle(org_img, new_img)
  draw_rectangles(images, @bottom, @left, @right, @top)
  save_images(new_file_name, new_img, org_file_name, org_img)
  true
end

#dimensions ⇒ Object 



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# File 'lib/capybara/screenshot/diff/image_compare.rb', line 52

def dimensions
  [@left, @top, @right, @bottom]
end