Struct PrimitiveCluster 

pub struct PrimitiveCluster {
    pub spatial_node_index: SpatialNodeIndex,
    pub unsnapped_bounding_rect: LayoutRect,
    pub snapped_bounding_rect: LayoutRect,
    pub prim_range: Range<usize>,
    pub flags: ClusterFlags,
}

Descriptor for a cluster of primitives. For now, this is quite basic but will be extended to handle more spatial clustering of primitives.

Fields

spatial_node_index: SpatialNodeIndex

The positioning node for this cluster.

unsnapped_bounding_rect: LayoutRect

The bounding rect of the cluster, in the local space of the spatial node, using display-list-authored prim culling rects (not snapped to the device pixel grid). This is used to quickly determine the overall bounding rect for a picture during the first picture traversal, which is needed for local scale determination, and render task size calculations.

snapped_bounding_rect: LayoutRect

The bounding rect of the cluster, snapped to the device pixel grid in the cluster’s own spatial-node space. Refreshed each frame by frame_snap::snap_frame_rects from unsnapped_bounding_rect, before any frame-time consumer reads it.

prim_range: Range<usize>

The range of primitive instance indices associated with this cluster.

flags: ClusterFlags

Various flags / state for this cluster.

Implementations

impl PrimitiveCluster

fn new( spatial_node_index: SpatialNodeIndex, flags: ClusterFlags, first_instance_index: usize, ) -> Self

Construct a new primitive cluster for a given positioning node.

pub fn is_compatible( &self, spatial_node_index: SpatialNodeIndex, flags: ClusterFlags, instance_index: usize, ) -> bool

Return true if this cluster is compatible with the given params

pub fn prim_range(&self) -> Range<usize>

fn add_instance(&mut self, culling_rect: &LayoutRect, instance_index: usize)

Add a primitive instance to this cluster, at the start or end

Trait Implementations

impl Serialize for PrimitiveCluster

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.