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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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31
components/shared/compositing/lib.rs
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@ -25,17 +25,17 @@ use std::sync::{Arc, Mutex};
use bitflags::bitflags;
use display_list::CompositorDisplayListInfo;
use embedder_traits::{CompositorHitTestResult, ScreenGeometry};
use embedder_traits::ScreenGeometry;
use euclid::default::Size2D as UntypedSize2D;
use ipc_channel::ipc::{self, IpcSharedMemory};
use profile_traits::mem::{OpaqueSender, ReportsChan};
use serde::{Deserialize, Serialize};
use webrender_api::units::{DevicePoint, LayoutVector2D, TexelRect};
use webrender_api::units::{LayoutVector2D, TexelRect};
use webrender_api::{
BuiltDisplayList, BuiltDisplayListDescriptor, ExternalImage, ExternalImageData,
ExternalImageHandler, ExternalImageId, ExternalImageSource, ExternalScrollId,
FontInstanceFlags, FontInstanceKey, FontKey, HitTestFlags, ImageData, ImageDescriptor,
ImageKey, NativeFontHandle, PipelineId as WebRenderPipelineId,
FontInstanceFlags, FontInstanceKey, FontKey, ImageData, ImageDescriptor, ImageKey,
NativeFontHandle, PipelineId as WebRenderPipelineId,
};
use crate::viewport_description::ViewportDescription;
@ -110,14 +110,6 @@ pub enum CompositorMsg {
/// An [ipc::IpcBytesReceiver] used to send the raw data of the display list.
display_list_receiver: ipc::IpcBytesReceiver,
},
/// Perform a hit test operation. The result will be returned via
/// the provided channel sender.
HitTest(
Option<WebRenderPipelineId>,
DevicePoint,
HitTestFlags,
IpcSender<Vec<CompositorHitTestResult>>,
),
/// Create a new image key. The result will be returned via the
/// provided channel sender.
GenerateImageKey(IpcSender<ImageKey>),
@ -245,21 +237,6 @@ impl CrossProcessCompositorApi {
}
}
/// Perform a hit test operation. Blocks until the operation is complete and
/// and a result is available.
pub fn hit_test(
&self,
pipeline: Option<WebRenderPipelineId>,
point: DevicePoint,
flags: HitTestFlags,
) -> Vec<CompositorHitTestResult> {
let (sender, receiver) = ipc::channel().unwrap();
self.0
.send(CompositorMsg::HitTest(pipeline, point, flags, sender))
.expect("error sending hit test");
receiver.recv().expect("error receiving hit test result")
}
/// Create a new image key. Blocks until the key is available.
pub fn generate_image_key_blocking(&self) -> Option<ImageKey> {
let (sender, receiver) = ipc::channel().unwrap();