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Add warning to imfilter! for transposed OffsetVectors #270

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1 change: 1 addition & 0 deletions src/imfilter.jl
Original file line number Diff line number Diff line change
Expand Up @@ -227,6 +227,7 @@ end

# Step 5: if necessary, pick an algorithm
function imfilter!(out::AbstractArray, img::AbstractArray, kernel::ProcessedKernel, border::AbstractBorder)
_warn_if_transposed_from_offset_vector(kernel)
imfilter!(out, img, kernel, border, filter_algorithm(out, img, kernel))
end

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11 changes: 11 additions & 0 deletions src/utils.jl
Original file line number Diff line number Diff line change
Expand Up @@ -131,3 +131,14 @@ accumfilter(pixelval::Colorant{N0f8}, filterval::N0f8) = float32(c)*Float32(filt
# In theory, the following might need to be specialized. For safety, make it a
# standalone function call.
safe_for_prod(x, ref) = oftype(ref, x)

function _warn_if_transposed_from_offset_vector(kernel::Tuple)
if any(_is_transposed_offset_vector, kernel)
@warn "A transposed OffsetVector automatically has an index of 1 in the first dimension. " *
"Consider using an OffsetMatrix to control the offset of each dimension."
end
end

_is_transposed_offset_vector(x::Adjoint{<:Any, <:OffsetVector}) = Base.has_offset_axes(parent(x))
_is_transposed_offset_vector(x::Transpose{<:Any, <:OffsetVector}) = Base.has_offset_axes(parent(x))
_is_transposed_offset_vector(_) = false
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