Struct PackedRgba 

#[repr(transparent)]
pub struct PackedRgba(pub u32);

A compact RGBA color.

• Size: 4 bytes (fits within the Cell 16-byte budget).
• Layout: 0xRRGGBBAA (R in bits 31..24, A in bits 7..0).

Notes

This is straight alpha storage (RGB channels are not pre-multiplied). Compositing uses Porter-Duff SourceOver (src over dst).

Tuple Fields

0: u32

Implementations

impl PackedRgba

pub const TRANSPARENT: Self

Fully transparent (alpha = 0).

pub const BLACK: Self

Opaque black.

pub const WHITE: Self

Opaque white.

pub const RED: Self

Opaque red.

pub const GREEN: Self

Opaque green.

pub const BLUE: Self

Opaque blue.

pub const fn rgb(r: u8, g: u8, b: u8) -> Self

Create an opaque RGB color (alpha = 255).

pub const fn rgba(r: u8, g: u8, b: u8, a: u8) -> Self

Create an RGBA color with explicit alpha.

pub const fn r(self) -> u8

Red channel.

pub const fn g(self) -> u8

Green channel.

pub const fn b(self) -> u8

Blue channel.

pub const fn a(self) -> u8

Alpha channel.

pub fn over(self, dst: Self) -> Self

Porter-Duff SourceOver: src over dst.

Stored as straight alpha, so we compute the exact rational form and round at the end (avoids accumulating rounding error across intermediate steps).

pub fn with_opacity(self, opacity: f32) -> Self

Apply uniform opacity in [0.0, 1.0] by scaling alpha.

Trait Implementations

impl Clone for PackedRgba

fn clone(&self) -> PackedRgba

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PackedRgba

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

Formats the value using the given formatter.

impl Default for PackedRgba

fn default() -> PackedRgba

Returns the “default value” for a type.

impl Hash for PackedRgba

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 PackedRgba

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

impl Eq for PackedRgba

impl StructuralPartialEq for PackedRgba