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layout: Consider transform for bounding box queries (#37871)

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The recent changes that cached the Scroll Tree present an opportunity to
calculate the queries that consider transform and scroll (dubbed as post
composite queries) accurately.

This PR propose a solution for this calculation by noting the lowest
scroll tree nodes that would affect a fragment. To do this, each
fragment would store a new attribute `spatial_tree_node` -- scroll tree
node id that we could use for the query. This referencing is considered
because the scroll tree node construction is managed by the fragment
itself. Therefore it would ease the managing the possibly stale
reference and future query cache invalidation considering the
development of incremental layout.

The bounding box query then could transform the bounding content rect of
a fragment using the computed current transformation matrix.

Fixes: https://github.com/servo/servo/issues/35768
Testing: Existing and new WPT

---------

Signed-off-by: stevennovaryo <steven.novaryo@gmail.com>
Signed-off-by: Jo Steven Novaryo <jo.steven.novaryo@huawei.com>
Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>
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Jo Steven Novaryo 2025-07-30 16:13:54 +08:00 • committed by GitHub
parent 37ac4ffeb4
commit 900dd8d191
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components/shared/base/id.rs
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@ -397,7 +397,7 @@ pub const TEST_WEBVIEW_ID: WebViewId = WebViewId(TEST_BROWSING_CONTEXT_ID);
/// An id for a ScrollTreeNode in the ScrollTree. This contains both the index
/// to the node in the tree's array of nodes as well as the corresponding SpatialId
/// for the SpatialNode in the WebRender display list.
#[derive(Clone, Copy, Debug, Default, Deserialize, PartialEq, Serialize)]
#[derive(Clone, Copy, Debug, Default, Deserialize, MallocSizeOf, PartialEq, Serialize)]
pub struct ScrollTreeNodeId {
/// The index of this scroll tree node in the tree's array of nodes.
pub index: usize,