Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 9014e0de0c569e8c335163803d0e6d61a4fd7bdf
https://github.com/WebKit/WebKit/commit/9014e0de0c569e8c335163803d0e6d61a4fd7bdf
Author: Tyler Wilcock <[email protected]>
Date: 2026-02-17 (Tue, 17 Feb 2026)
Changed paths:
M Source/WebCore/accessibility/AXCoreObject.h
M Source/WebCore/accessibility/AXGeometryManager.cpp
M Source/WebCore/accessibility/AXGeometryManager.h
M Source/WebCore/accessibility/AXObjectCache.h
M Source/WebCore/accessibility/isolatedtree/AXIsolatedObject.cpp
Log Message:
-----------
AX: When servicing a hit test, preemptively hit-test nearby points and cache
the results to make future AT hit-tests faster
https://bugs.webkit.org/show_bug.cgi?id=307919
rdar://170401294
Reviewed by Joshua Hoffman.
Certain assistive technologies (like HoverText) send very rapid hit-tests that
are all close to each other (think of a
mouse moving across the screen). This commit uses this knowledge to build an
optimization where when we get a hit-test
from an AT, we asynchronously also hit test nearby points and cache the
results, meaning we can instantly serve follow-up
AT hit-tests for nearby points. The entries in this cache expire after a set
time, and are invalidated if their object
changes its bounding box.
* Source/WebCore/accessibility/AXCoreObject.h:
* Source/WebCore/accessibility/AXGeometryManager.cpp:
(WebCore::AXGeometryManager::cacheRectIfNeeded):
(WebCore::AXGeometryManager::initializePrimaryScreenRect):
(WebCore::AXGeometryManager::primaryScreenRect):
(WebCore::AXGeometryManager::cachedHitTestResult):
(WebCore::hitTestExpirationTime):
(WebCore::AXGeometryManager::cacheHitTestResult):
(WebCore::AXGeometryManager::expandHitTestCacheAroundPoint):
(WebCore::AXGeometryManager::invalidateHitTestCacheForID):
(WebCore::AXGeometryManager::clearHitTestCache):
* Source/WebCore/accessibility/AXGeometryManager.h:
* Source/WebCore/accessibility/AXObjectCache.h:
* Source/WebCore/accessibility/isolatedtree/AXIsolatedObject.cpp:
(WebCore::AXIsolatedObject::accessibilityHitTest const):
(WebCore::AXIsolatedObject::approximateHitTest const):
Canonical link: https://commits.webkit.org/307742@main
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