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Add a function to check if Orientation can be applied in-place #2329

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Add a function to check if Orientation can be applied in-place #2329

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19 changes: 19 additions & 0 deletions src/metadata.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -53,4 +53,23 @@ impl Orientation {
Self::Rotate270 => 8,
}
}

/// Returns `true` if the specified orientation can be applied to an image in-place,
/// without making a copy of the image.
///
/// This is relevant if you need to enforce a memory limit,
/// since a copy of the image will briefly use additional memory to store the copy.
/// The required amount of additional memory is the same as the memory used to store the original image.
pub fn applies_in_place(self) -> bool {
match self {
Orientation::NoTransforms => true,
Orientation::Rotate90 => false,
Orientation::Rotate180 => true,
Orientation::Rotate270 => false,
Orientation::FlipHorizontal => true,
Orientation::FlipVertical => true,
Orientation::Rotate90FlipH => false,
Orientation::Rotate270FlipH => false,
}
}
}
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