Struct GroupBitmap 

pub struct GroupBitmap<P: Pixel> {
    pub bitmap: Bitmap<P>,
    pub saved_clip: Clip,
    pub params: GroupParams,
    pub alpha: Vec<u8>,
    pub alpha0: Option<Arc<[u8]>>,
}

A group bitmap together with its compositing metadata.

Returned by begin_group; passed to paint_group or discard_group.

Fields

bitmap: Bitmap<P>

The rendered group content.

saved_clip: Clip

Clip region at the time the group was opened (restored on pop).

params: GroupParams

Compositing parameters recorded at begin_group time.

alpha: Vec<u8>

Per-pixel alpha plane (one byte per pixel, matching bitmap’s pixel count). For an isolated group, this starts at zero; for a non-isolated group it is copied from the parent’s alpha plane.

alpha0: Option<Arc<[u8]>>

For non-isolated groups: a snapshot of the parent alpha at the time the group was opened, used as alpha0 during the compositing pass.

Implementations

impl<P: Pixel> GroupBitmap<P>

pub const fn dims(&self) -> (u32, u32)

Returns the (width, height) of the group bitmap in pixels.