struct SpatialNodeComparer {
    ref_spatial_node_index: SpatialNodeIndex,
    spatial_nodes: FastHashMap<SpatialNodeKey, TransformKey>,
    compare_cache: FastHashMap<(SpatialNodeKey, SpatialNodeKey), bool>,
    referenced_frames: HashSet<FrameId, BuildHasherDefault<FxHasher>>,
}
Expand description

A helper for comparing spatial nodes between frames. The comparisons are done by-value, so that if the shape of the spatial node tree changes, invalidations aren’t done simply due to the spatial node index changing between display lists.

Fields§

§ref_spatial_node_index: SpatialNodeIndex

The root spatial node index of the tile cache

§spatial_nodes: FastHashMap<SpatialNodeKey, TransformKey>

Maintains a map of currently active transform keys

§compare_cache: FastHashMap<(SpatialNodeKey, SpatialNodeKey), bool>

A cache of recent comparisons between prev and current spatial nodes

§referenced_frames: HashSet<FrameId, BuildHasherDefault<FxHasher>>

A set of frames that we need to retain spatial node entries for

Implementations§

source§

impl SpatialNodeComparer

source

fn new() -> Self

Construct a new comparer

source

fn next_frame(&mut self, ref_spatial_node_index: SpatialNodeIndex)

Advance to the next frame

source

fn register_used_transform( &mut self, spatial_node_index: SpatialNodeIndex, frame_id: FrameId, spatial_tree: &SpatialTree )

Register a transform that is used, and build the transform key for it if new.

source

fn are_transforms_equivalent( &mut self, prev_spatial_node_key: &SpatialNodeKey, curr_spatial_node_key: &SpatialNodeKey ) -> bool

Return true if the transforms for two given spatial nodes are considered equivalent

source

fn retain_for_frame(&mut self, frame_id: FrameId)

Ensure that the comparer won’t GC any nodes for a given frame id

Auto Trait Implementations§

Blanket Implementations§

source§

impl<T> Any for Twhere T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for Twhere T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for Twhere T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for Twhere U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T> IntoEither for T

source§

fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
source§

fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
source§

impl<T> Pointable for T

source§

const ALIGN: usize = _

The alignment of pointer.
§

type Init = T

The type for initializers.
source§

unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
source§

unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
source§

unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
source§

unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
source§

impl<T, U> TryFrom<U> for Twhere U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.