Enum CopySrc 

#[non_exhaustive]
pub enum CopySrc {
    Never,
    IfSupported,
    Required,
}

How badly the caller needs COPY_SRC on the surface texture.

COPY_SRC is what lets crate::WgpuGfxCtx::read_screenshot blit the rendered surface into a staging buffer. Not every surface supports it, so the caller states whether a screenshot is optional or the point of the run.

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.

Never

Never request it — the app has no read-back path.

IfSupported

Request it when the surface supports it; carry on quietly if not. The read-back path degrades to returning no pixels.

Required

Fail surface creation when the surface cannot provide it — for a headless capture run, where a missing screenshot is the whole failure.

Trait Implementations

impl Clone for CopySrc

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CopySrc

impl Debug for CopySrc

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

Formats the value using the given formatter.

impl Default for CopySrc

fn default() -> Self

Returns the “default value” for a type.

impl Eq for CopySrc

impl PartialEq for CopySrc

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for CopySrc