Enum CompositeAlphaMode

#[repr(C)]
pub enum CompositeAlphaMode {
    Auto = 0,
    Opaque = 1,
    PreMultiplied = 2,
    PostMultiplied = 3,
    Inherit = 4,
}

Specifies how the alpha channel of the textures should be handled during compositing.

Variants

Auto = 0

Chooses either Opaque or Inherit automatically，depending on the alpha_mode that the current surface can support.

Opaque = 1

The alpha channel, if it exists, of the textures is ignored in the compositing process. Instead, the textures is treated as if it has a constant alpha of 1.0.

PreMultiplied = 2

The alpha channel, if it exists, of the textures is respected in the compositing process. The non-alpha channels of the textures are expected to already be multiplied by the alpha channel by the application.

PostMultiplied = 3

The alpha channel, if it exists, of the textures is respected in the compositing process. The non-alpha channels of the textures are not expected to already be multiplied by the alpha channel by the application; instead, the compositor will multiply the non-alpha channels of the texture by the alpha channel during compositing.

Inherit = 4

The alpha channel, if it exists, of the textures is unknown for processing during compositing. Instead, the application is responsible for setting the composite alpha blending mode using native WSI command. If not set, then a platform-specific default will be used.

Trait Implementations

impl Clone for CompositeAlphaMode

fn clone(&self) -> CompositeAlphaMode

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for CompositeAlphaMode

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

Formats the value using the given formatter.

impl Default for CompositeAlphaMode

fn default() -> Self

Returns the “default value” for a type.

impl Hash for CompositeAlphaMode

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 CompositeAlphaMode

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

impl Eq for CompositeAlphaMode

impl StructuralPartialEq for CompositeAlphaMode