Enum Orientation 

#[non_exhaustive]
#[repr(u8)]
pub enum Orientation {
    Normal = 1,
    FlipHorizontal = 2,
    Rotate180 = 3,
    FlipVertical = 4,
    Transpose = 5,
    Rotate90 = 6,
    Transverse = 7,
    Rotate270 = 8,
}

EXIF orientation tag values.

Describes how the stored pixels should be transformed for display. Values match the EXIF Orientation tag (TIFF tag 274).

When a codec applies orientation during decode, it sets orientation to Normal in the returned ImageInfo. When orientation is not applied, the caller is responsible for transforming the pixel data according to this value.

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.

Normal = 1

No rotation or flip needed.

FlipHorizontal = 2

Flip horizontally (mirror left-right).

Rotate180 = 3

Rotate 180 degrees.

FlipVertical = 4

Flip vertically (mirror top-bottom).

Transpose = 5

Transpose (rotate 90 CW then flip horizontally).

Rotate90 = 6

Rotate 90 degrees clockwise.

Transverse = 7

Transverse (rotate 90 CCW then flip horizontally).

Rotate270 = 8

Rotate 270 degrees clockwise (= 90 CCW).

Implementations

impl Orientation

pub fn from_exif(value: u16) -> Self

Create from EXIF orientation value (1-8).

Returns Normal for out-of-range values.

pub fn exif_value(self) -> u16

EXIF tag value (1-8).

pub fn swaps_dimensions(self) -> bool

Whether this orientation swaps width and height.

True for orientations involving a 90 or 270 degree rotation (values 5-8).

pub fn display_dimensions( self, stored_width: u32, stored_height: u32, ) -> (u32, u32)

Compute display dimensions for the given stored dimensions.

If orientation swaps dimensions (90/270 rotation), width and height are exchanged.

pub fn is_identity(self) -> bool

Whether any transformation is needed.

Trait Implementations

impl Clone for Orientation

fn clone(&self) -> Orientation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Orientation

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

Formats the value using the given formatter.

impl Default for Orientation

fn default() -> Orientation

Returns the “default value” for a type.

impl Hash for Orientation

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 Orientation

fn eq(&self, other: &Orientation) -> 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 Orientation

impl Eq for Orientation

impl StructuralPartialEq for Orientation