Class: Capybara::Screenshot::Diff::Drivers::VipsDriver::VipsUtil

Inherits:
Object
  • Object
show all
Defined in:
lib/capybara/screenshot/diff/drivers/vips_driver.rb

Class Method Summary collapse

Class Method Details

.difference(old_image, new_image, color_distance: 0) ⇒ Object 



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# File 'lib/capybara/screenshot/diff/drivers/vips_driver.rb', line 160

def self.difference(old_image, new_image, color_distance: 0)
  diff_mask = difference_mask(color_distance, new_image, old_image)
  difference_region_by(diff_mask).to_edge_coordinates
end

.difference_area(old_image, new_image, color_distance: 0) ⇒ Object 



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# File 'lib/capybara/screenshot/diff/drivers/vips_driver.rb', line 165

def self.difference_area(old_image, new_image, color_distance: 0)
  difference_mask = difference_mask(color_distance, new_image, old_image)
  difference_area_size_by(difference_mask)
end

.difference_area_size_by(difference_mask) ⇒ Object 



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# File 'lib/capybara/screenshot/diff/drivers/vips_driver.rb', line 170

def self.difference_area_size_by(difference_mask)
  diff_mask = difference_mask == 0
  diff_mask.hist_find.to_a[0][0].max
end

.difference_mask(color_distance, old_image, new_image) ⇒ Object 



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# File 'lib/capybara/screenshot/diff/drivers/vips_driver.rb', line 175

def self.difference_mask(color_distance, old_image, new_image)
  (new_image - old_image).abs > color_distance
end

.difference_region_by(diff_mask) ⇒ Object 



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# File 'lib/capybara/screenshot/diff/drivers/vips_driver.rb', line 179

def self.difference_region_by(diff_mask)
  columns, rows = diff_mask.bandor.project

  left = columns.profile[1].min
  right = columns.width - columns.flip("horizontal").profile[1].min

  top = rows.profile[0].min
  bottom = rows.height - rows.flip("vertical").profile[0].min

  return nil if right < left || bottom < top

  Region.from_edge_coordinates(left, top, right, bottom)
end