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module Vips
# Blend mode to use when compositing images. See {Image#composite}.
#
# * `:clear` where the second object is drawn, the first is removed
# * `:source` the second object is drawn as if nothing were below
# * `:over` the image shows what you would expect if you held two
# semi-transparent slides on top of each other
# * `:in` the first object is removed completely, the second is only
# drawn where the first was
# * `:out` the second is drawn only where the first isn't
# * `:atop` this leaves the first object mostly intact, but mixes both
# objects in the overlapping area
# * `:dest` leaves the first object untouched, the second is discarded
# completely
# * `:dest_over` like `:over`, but swaps the arguments
# * `:dest_in` like `:in`, but swaps the arguments
# * `:dest_out` like `:out`, but swaps the arguments
# * `:dest_atop` like `:atop`, but swaps the arguments
# * `:xor` something like a difference operator
# * `:add` a bit like adding the two images
# * `:saturate` a bit like the darker of the two
# * `:multiply` at least as dark as the darker of the two inputs
# * `:screen` at least as light as the lighter of the inputs
# * `:overlay` multiplies or screens colors, depending on the lightness
# * `:darken` the darker of each component
# * `:lighten` the lighter of each component
# * `:colour_dodge` brighten first by a factor second
# * `:colour_burn` darken first by a factor of second
# * `:hard_light` multiply or screen, depending on lightness
# * `:soft_light` darken or lighten, depending on lightness
# * `:difference` difference of the two
# * `:exclusion` somewhat like `:difference`, but lower-contrast
class BlendMode < Symbol
end
end
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