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avoid stackoverflow when passing two types that can not be promoted to a matching types in mean_hue #566

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May 23, 2025
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avoid stackoverflow when passing two types that can not be promoted to a matching types in mean_hue #566

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16 changes: 9 additions & 7 deletions src/utilities.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -395,14 +395,17 @@ When the hue difference is exactly 180 degrees, which of the two mean hues is
returned depends on the implementation. In other words, it may vary by the color
type and version.
"""
function mean_hue(h1::T, h2::T) where {T <: Real}
mean_hue(a, b) = _mean_hue(promote(a, b)...)

_mean_hue(a, b) = error("input arguments to `mean_hue` could not promote to valid input types")
function _mean_hue(h1::T, h2::T) where {T <: Real}
@fastmath hmin, hmax = minmax(h1, h2)
d = 180 - normalize_hue(hmin - hmax - 180)
F = typeof(zero(T) / 2)
mh = muladd(F(0.5), d, hmin)
return mh < 0 ? mh + 360 : mh
end
@inline function mean_hue(a::C, b::C) where {Cb <: Union{Lab, Luv, Oklab},
@inline function _mean_hue(a::C, b::C) where {Cb <: Union{Lab, Luv, Oklab},
C <: Union{Cb, AlphaColor{Cb}, ColorAlpha{Cb}}}
a1, b1, a2, b2 = comp2(a), comp3(a), comp2(b), comp3(b)
c1, c2 = chroma(a), chroma(b)
Expand All @@ -422,15 +425,14 @@ end
mb = muladd(k2, b1, k1 * b2)
hue(Cb(zero(ma), ma, mb))
end
function mean_hue(a::C, b::C) where {Cb <: Union{LCHab, LCHuv, Oklch},
function _mean_hue(a::C, b::C) where {Cb <: Union{LCHab, LCHuv, Oklch},
C <: Union{Cb, AlphaColor{Cb}, ColorAlpha{Cb}}}
mean_hue(a.c == 0 ? b.h : a.h, b.c == 0 ? a.h : b.h)
_mean_hue(a.c == 0 ? b.h : a.h, b.c == 0 ? a.h : b.h)
end
function mean_hue(a::C, b::C) where {Cb <: Union{HSV, HSL, HSI},
function _mean_hue(a::C, b::C) where {Cb <: Union{HSV, HSL, HSI},
C <: Union{Cb, AlphaColor{Cb}, ColorAlpha{Cb}}}
mean_hue(a.s == 0 ? b.h : a.h, b.s == 0 ? a.h : b.h)
_mean_hue(a.s == 0 ? b.h : a.h, b.s == 0 ? a.h : b.h)
end
mean_hue(a, b) = mean_hue(promote(a, b)...)

_delta_h_th(T) = zero(T)
_delta_h_th(::Type{Float32}) = 0.1f0
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