Enum PaddingMode 

pub enum PaddingMode {
    Constant,
    Replicate,
    Reflect101,
    Reflect,
    Wrap,
}

A border type for the spatial padding.

Variants

Constant

This border type fills the border with a single, constant color value.

Example: …d c b a | 0 0 0 0…

Replicate

This border type takes the outermost row or column of pixels and repeats it into the padded region.

Example: …d c b a | a a a a…

Reflect101

This border type reflects the pixel values at the boundary, starting with the pixel ‘next’ to the edge.

Example: …d c b a | b c d e…

Reflect

This border type reflects the pixel values at the boundary, starting with the edge pixel itself.

Example: …d c b a | a b c d…

Wrap

This border type wraps the content from the opposite side to fill the border.

Example: …d c b a | w x y z…

Implementations

impl PaddingMode

pub fn map_index(&self, i: isize, len: usize) -> usize

Maps index i to a valid index i.e. within [0, len) according to the padding mode.

• Replicate: clamp to edge
• Reflect: mirror including edge
• Reflect101: mirror excluding edge
• Wrap: circular wrap
• Constant: returns 0 (not used directly)

Arguments

• i: The (possibly out-of-range) coordinate index.
• len: The valid length of the dimension.

Returns

A valid mapped index within [0, len).

pub fn apply_padding<T: Copy + Send + Sync, const C: usize>( &self, new_data: &mut [T], old_width: usize, old_height: usize, new_width: usize, new_height: usize, padding: &Padding2D, )

Applies the selected padding mode to fill image borders in new_data.

Arguments

• new_data: Target image buffer (already containing the original image in the center).
• old_width, old_height: Dimensions of the original image.
• new_width, new_height: Dimensions of the padded image.
• padding: left, right, top and bottom padding extents in pixels.

Notes

• PaddingMode::Constant is assumed to be already applied when initializing new_data.
• Other modes (Replicate, Reflect, Reflect101, Wrap) will fill the outer border areas.

Trait Implementations

impl Clone for PaddingMode

fn clone(&self) -> PaddingMode

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for PaddingMode

impl Debug for PaddingMode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.