Enum Align 

#[non_exhaustive]
pub enum Align {
    Crop(u32, u32),
    Extend(u32, u32),
    Distort(u32, u32),
}

How to align output dimensions to codec-required multiples.

All variants take (x_align, y_align) for per-axis alignment. Use Subsampling::mcu_align() for JPEG MCU-aligned extend.

    Source: 801x601, align to mod-16

    Crop:     800x592  --  round down, lose edge pixels
    Extend:   816x608  --  round up, replicate edges, content_size=(801,601)
    Distort:  800x608  --  round to nearest, slight stretch

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Crop(u32, u32)

Round canvas down to nearest multiple per axis. Loses up to n-1 edge pixels per axis. Simple, lossy.

Extend(u32, u32)

Extend canvas up to nearest multiple per axis. Resets placement to (0, 0) — renderer replicates edge pixels into the extension area at the bottom-right. Original content dimensions stored in IdealLayout::content_size / LayoutPlan::content_size. No content loss. This is how JPEG MCU padding works.

Distort(u32, u32)

Round resize_to to nearest multiple per axis, stretching content slightly to fit. Minimal distortion, no pixel loss, no padding. Canvas follows resize_to in non-pad modes; in pad modes the image is recentered within the existing canvas.

Implementations

impl Align

pub const fn uniform_crop(n: u32) -> Self

Uniform crop alignment (same for both axes).

pub const fn uniform_extend(n: u32) -> Self

Uniform extend alignment (same for both axes).

pub const fn uniform_distort(n: u32) -> Self

Uniform distort alignment (same for both axes).

Trait Implementations

impl Clone for Align

fn clone(&self) -> Align

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Align

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

Formats the value using the given formatter.

impl Hash for Align

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Align

fn eq(&self, other: &Align) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Align

impl Eq for Align

impl StructuralPartialEq for Align