Struct webrender::picture::SpatialNodeComparer

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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.

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§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§

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impl SpatialNodeComparer

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fn new() -> Self

Construct a new comparer

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fn next_frame(&mut self, ref_spatial_node_index: SpatialNodeIndex)

Advance to the next frame

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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.

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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

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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§

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impl UnwindSafe for SpatialNodeComparer

Blanket Implementations§

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

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Gets the TypeId of self. Read more

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

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fn borrow(&self) -> &T

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impl<T> BorrowMut<T> for T
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fn borrow_mut(&mut self) -> &mut T

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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

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

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impl<T> IntoEither for T

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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

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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

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