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compositor/layout: Rely on layout for fine-grained input event hit testing (#38480)

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Before, the compositor was responsible for doing the hit testing during
input events within a page. This change moves that hit testing to
layout.  With this change, epoch mismatches are no longer a bit deal and
we can simply ignore them, as the Constellation and Script will take
care of ignoring hit tests against scroll nodes and browsing contexts
that no longer exist. This means that hit testing retry support can be
removed.

Add the concept of a Script `HitTest` that transforms the coarse-grained
renderer hit test into one that hit tests against the actual layout
items.

Testing: Currently we do not have good tests for verifying the behavior
of
input events, but WebDriver tests should cover this.
Fixes: This is part of #37932.
Fixes: #26608.
Fixes: #25282.
Fixes: #38090.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Oriol Brufau <obrufau@igalia.com>
Co-authored-by: kongbai1996 <1782765876@qq.com>
This commit is contained in:
Martin Robinson 2025-08-07 10:38:43 +02:00 • committed by GitHub
parent c0cc8484f8
commit ad805e3110
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GPG key ID: B5690EEEBB952194
19 changed files with 348 additions and 511 deletions
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91
components/shared/compositing/display_list.rs
View file

@ -10,7 +10,7 @@ use std::collections::HashMap;
use base::id::ScrollTreeNodeId;
use base::print_tree::PrintTree;
use bitflags::bitflags;
use embedder_traits::{Cursor, ViewportDetails};
use embedder_traits::ViewportDetails;
use euclid::{SideOffsets2D, Transform3D};
use malloc_size_of_derive::MallocSizeOf;
use serde::{Deserialize, Serialize};
@ -57,20 +57,6 @@ pub struct AxesScrollSensitivity {
pub y: ScrollType,
}
/// Information that Servo keeps alongside WebRender display items
/// in order to add more context to hit test results.
#[derive(Debug, Deserialize, PartialEq, Serialize)]
pub struct HitTestInfo {
/// The id of the node of this hit test item.
pub node: u64,
/// The cursor of this node's hit test item.
pub cursor: Option<Cursor>,
/// The id of the [ScrollTree] associated with this hit test item.
pub scroll_tree_node: ScrollTreeNodeId,
}
#[derive(Debug, Deserialize, Serialize)]
pub enum SpatialTreeNodeInfo {
ReferenceFrame(ReferenceFrameNodeInfo),
@ -514,17 +500,33 @@ impl ScrollTree {
})
}
/// Scroll the given scroll node on this scroll tree. If the node cannot be scrolled,
/// because it isn't a scrollable node or it's already scrolled to the maximum scroll
fn node_with_external_scroll_node_id(
&self,
external_id: &ExternalScrollId,
) -> Option<ScrollTreeNodeId> {
self.nodes
.iter()
.enumerate()
.find_map(|(index, node)| match &node.info {
SpatialTreeNodeInfo::Scroll(info) if info.external_id == *external_id => {
Some(ScrollTreeNodeId { index })
},
_ => None,
})
}
/// Scroll the scroll node with the given [`ExternalScrollId`] on this scroll tree. If
/// the node cannot be scrolled, because it's already scrolled to the maximum scroll
/// extent, try to scroll an ancestor of this node. Returns the node scrolled and the
/// new offset if a scroll was performed, otherwise returns None.
pub fn scroll_node_or_ancestor(
&mut self,
scroll_node_id: &ScrollTreeNodeId,
external_id: &ExternalScrollId,
scroll_location: ScrollLocation,
context: ScrollType,
) -> Option<(ExternalScrollId, LayoutVector2D)> {
let result = self.scroll_node_or_ancestor_inner(scroll_node_id, scroll_location, context);
let scroll_node_id = self.node_with_external_scroll_node_id(external_id)?;
let result = self.scroll_node_or_ancestor_inner(&scroll_node_id, scroll_location, context);
if result.is_some() {
self.invalidate_cached_transforms();
}
@ -713,6 +715,22 @@ impl ScrollTree {
};
root_node.invalidate_cached_transforms(self, false /* ancestors_invalid */);
}
fn external_scroll_id_for_scroll_tree_node(
&self,
id: ScrollTreeNodeId,
) -> Option<ExternalScrollId> {
let mut maybe_node = Some(self.get_node(&id));
while let Some(node) = maybe_node {
if let Some(external_scroll_id) = node.external_id() {
return Some(external_scroll_id);
}
maybe_node = node.parent.map(|id| self.get_node(&id));
}
None
}
}
/// In order to pretty print the [ScrollTree] structure, we are converting
@ -787,11 +805,6 @@ pub struct CompositorDisplayListInfo {
/// The epoch of the display list.
pub epoch: Epoch,
/// An array of `HitTestInfo` which is used to store information
/// to assist the compositor to take various actions (set the cursor,
/// scroll without layout) using a WebRender hit test result.
pub hit_test_info: Vec<HitTestInfo>,
/// A ScrollTree used by the compositor to scroll the contents of the
/// display list.
pub scroll_tree: ScrollTree,
@ -856,7 +869,6 @@ impl CompositorDisplayListInfo {
viewport_details,
content_size,
epoch,
hit_test_info: Default::default(),
scroll_tree,
root_reference_frame_id,
root_scroll_node_id,
@ -865,27 +877,12 @@ impl CompositorDisplayListInfo {
}
}
/// Add or re-use a duplicate HitTestInfo entry in this `CompositorHitTestInfo`
/// and return the index.
pub fn add_hit_test_info(
&mut self,
node: u64,
cursor: Option<Cursor>,
scroll_tree_node: ScrollTreeNodeId,
) -> usize {
let hit_test_info = HitTestInfo {
node,
cursor,
scroll_tree_node,
};
if let Some(last) = self.hit_test_info.last() {
if hit_test_info == *last {
return self.hit_test_info.len() - 1;
}
}
self.hit_test_info.push(hit_test_info);
self.hit_test_info.len() - 1
pub fn external_scroll_id_for_scroll_tree_node(
&self,
id: ScrollTreeNodeId,
) -> ExternalScrollId {
self.scroll_tree
.external_scroll_id_for_scroll_tree_node(id)
.unwrap_or(ExternalScrollId(0, self.pipeline_id))
}
}