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Add complement migrated from Images.jl #144

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Merged
merged 1 commit into from
Mar 4, 2021
Merged

Add complement migrated from Images.jl #144

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12 changes: 11 additions & 1 deletion src/ColorVectorSpace.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,7 @@ import SpecialFunctions: gamma, lgamma, lfact
using Statistics
import Statistics: middle, _mean_promote

export RGBRGB, nan, dotc, dot, ⋅, hadamard, ⊙, tensor, ⊗, norm, varmult
export RGBRGB, complement, nan, dotc, dot, ⋅, hadamard, ⊙, tensor, ⊗, norm, varmult

MathTypes{T,C} = Union{AbstractRGB{T},TransparentRGB{C,T},AbstractGray{T},TransparentGray{C,T}}

Expand Down Expand Up @@ -225,6 +225,16 @@ for op in unaryOps
@eval ($op)(c::AbstractGray) = Gray($op(gray(c)))
end

"""
y = complement(x)

Take the complement `1-x` of `x`. If `x` is a color with an alpha channel,
the alpha channel is left untouched. Don't forget to add a dot when `x` is
an array: `complement.(x)`
"""
complement(x::Union{Number,Colorant}) = oneunit(x)-x
complement(x::TransparentColor) = typeof(x)(complement(color(x)), alpha(x))

middle(c::AbstractGray) = arith_colorant_type(c)(middle(gray(c)))
middle(x::C, y::C) where {C<:AbstractGray} = arith_colorant_type(C)(middle(gray(x), gray(y)))

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14 changes: 14 additions & 0 deletions test/runtests.jl
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Expand Up @@ -479,6 +479,20 @@ ColorTypes.blue(c::RatRGB) = c.b
@test cf ⋅ cf === (Float64(red(cf))^2 + Float64(green(cf))^2 + Float64(blue(cf))^2)/3
end

@testset "Complement" begin
@test complement(Gray(0.2)) === Gray(0.8)
@test complement(AGray(0.2f0, 0.7f0)) === AGray(0.8f0, 0.7f0)
@test complement(GrayA{N0f8}(0.2, 0.7)) === GrayA{N0f8}(0.8, 0.7)
@test_broken complement(Gray24(0.2)) === Gray24(0.8)
@test_broken complement(AGray32(0.2, 0.7)) === AGray32(0.8, 0.7)
Comment on lines +486 to +487
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Also, oneunit(::AbstractGray) has been missing. This may be fixed in ColorTypes v0.11.


@test complement(RGB(0, 0.3, 1)) === RGB(1, 0.7, 0)
@test complement(ARGB(0, 0.3f0, 1, 0.7f0)) === ARGB(1, 0.7f0, 0, 0.7f0)
@test complement(RGBA{N0f8}(0, 0.6, 1, 0.7)) === RGBA{N0f8}(1, 0.4, 0.0, 0.7)
@test complement(RGB24(0, 0.6, 1)) === RGB24(1, 0.4, 0.0)
@test complement(ARGB32(0, 0.6, 1, 0.7)) === ARGB32(1, 0.4, 0.0, 0.7)
end

@testset "dotc" begin
@test dotc(0.2, 0.2) == 0.2^2
@test dotc(Int8(3), Int16(6)) === 18
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