Enum AlphaMode 

#[non_exhaustive]
#[repr(u8)]
pub enum AlphaMode {
    Undefined = 1,
    Straight = 2,
    Premultiplied = 3,
    Opaque = 4,
}

Alpha channel interpretation.

Wrapped in Option<AlphaMode> on PixelDescriptor: None means no alpha channel exists, while Some(AlphaMode::Straight) etc. describe the semantics of a present alpha channel.

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.

Undefined = 1

Alpha bytes exist but values are undefined padding (RGBX, BGRX).

Straight = 2

Straight (unassociated) alpha.

Premultiplied = 3

Premultiplied (associated) alpha.

Opaque = 4

Alpha channel present, all values fully opaque.

Implementations

impl AlphaMode

pub const fn has_alpha(self) -> bool

Whether this mode represents a real alpha channel (not Undefined padding).

Trait Implementations

impl Clone for AlphaMode

fn clone(&self) -> AlphaMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AlphaMode

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

Formats the value using the given formatter.

impl Display for AlphaMode

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

Formats the value using the given formatter.

impl Hash for AlphaMode

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

where __H: Hasher,

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 AlphaMode

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

impl Eq for AlphaMode

impl StructuralPartialEq for AlphaMode