Enum CompositeOp 

pub enum CompositeOp {
    Over,
    Under,
    In,
    Out,
    Atop,
    Xor,
}

Porter-Duff alpha-compositing operator for combining two video layers.

Unlike BlendMode (which operates on pixel values), these operators combine layers by their alpha channels. At least the top layer must carry an alpha channel (e.g. rgba or yuva420p).

There is no blend all_mode token for Porter-Duff compositing, so this type has no FfmpegToken impl; each operator maps to a specific FFmpeg construction (overlay or blend with a per-channel expression) in the filter graph.

Variants

Over

Top layer rendered over the bottom (standard alpha compositing).

Built via overlay=format=auto:shortest=1.

Under

Bottom layer rendered over the top; Over with the inputs swapped.

Built via overlay with swapped input order.

In

Top layer masked by the bottom layer’s alpha (intersection).

Built via blend with c0_expr='B*A/255'.

Out

Top layer visible only where the bottom layer is transparent.

Built via blend with c0_expr='B*(255-A)/255'.

Atop

Top layer placed atop the bottom; visible only where the bottom is opaque.

Built via blend with c0_expr='B*A/255 + A*(255-B)/255'.

Xor

Pixels from exactly one layer (XOR of opaque regions).

Built via blend with c0_expr='B*(255-A)/255 + A*(255-B)/255'.

Trait Implementations

impl Clone for CompositeOp

fn clone(&self) -> CompositeOp

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CompositeOp

impl Debug for CompositeOp

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

Formats the value using the given formatter.

impl Default for CompositeOp

fn default() -> CompositeOp

Returns the “default value” for a type.

impl Eq for CompositeOp

impl PartialEq for CompositeOp

fn eq(&self, other: &CompositeOp) -> 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 StructuralPartialEq for CompositeOp