Enum RenderBitmap 

pub enum RenderBitmap {
    Coverage {
        width: u32,
        height: u32,
        coverage: Arc<Vec<u8>>,
        x: i32,
        y: i32,
        color: [u8; 4],
    },
    Rgba {
        width: u32,
        height: u32,
        pixels: Arc<Vec<u8>>,
        x: i32,
        y: i32,
    },
}

A positioned bitmap — the renderer’s libass-ASS_Image-style output unit. A frame is a list of these; the caller (or composite_bitmap) blends them.

The common case is Coverage (A8 + one colour): producing it from a cached tile is an Arc clone, so geometry-static animated layers cost almost nothing per frame. Complex effects that mix colours within a layer (blur, swept karaoke, clip) are pre-composited into an Rgba tile.

Variants

Coverage

An 8-bit coverage mask plus a single straight RGBA colour.

Fields

width: u32

Bitmap width in pixels.

height: u32

Bitmap height in pixels.

coverage: Arc<Vec<u8>>

width * height A8 coverage bytes.

x: i32

Destination x of the top-left, in frame pixels.

y: i32

Destination y of the top-left, in frame pixels.

color: [u8; 4]

Straight (non-premultiplied) RGBA colour applied through the coverage.

Rgba

A pre-composited premultiplied-RGBA tile (width * height * 4 bytes).

Fields

width: u32

Bitmap width in pixels.

height: u32

Bitmap height in pixels.

pixels: Arc<Vec<u8>>

width * height * 4 premultiplied RGBA bytes.

x: i32

Destination x of the top-left, in frame pixels.

y: i32

Destination y of the top-left, in frame pixels.

Trait Implementations

impl Clone for RenderBitmap

fn clone(&self) -> RenderBitmap

Returns a duplicate of the value.

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

Performs copy-assignment from source.