Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: b82feba1824ebd42478f2ad9eecb7c112a24db49
https://github.com/WebKit/WebKit/commit/b82feba1824ebd42478f2ad9eecb7c112a24db49
Author: Wenson Hsieh <wenson_hs...@apple.com>
Date: 2025-04-04 (Fri, 04 Apr 2025)
Changed paths:
M Source/WebKit/WebProcess/WebPage/ViewGestureGeometryCollector.cpp
Log Message:
-----------
[watchOS] Occasional crash in
ViewGestureGeometryCollector::computeTextLegibilityScales when double-tapping
https://bugs.webkit.org/show_bug.cgi?id=288407
rdar://145501290
Reviewed by Abrar Rahman Protyasha.
Avoid hash table lookup and mutation in `computeTextLegibilityScales`, in the
case where the font
size is not a valid `unsigned` hash key; this would correspond to either 0 or
an extremely large
value anyways, which can safely be ignored for the purposes of this heuristic,
which attempts to
estimate a good scale to set when double-tapping to zoom that makes most of the
text on the webpage
legible, based on a histogram of sampled font sizes for visible text in the DOM.
To make this code a bit easier to reason about, we also replace the
`HashMap<unsigned, unsigned>`
with `HashCountedSet<unsigned>`, and use `add(…)` to increment the counter per
bucket. Importantly,
we can also use `HashCountedSet::isValidValue` to avoid any attempts to perform
hash table lookup/
mutations against invalid keys (note that the `ValueType` for a
`HashCountedSet` corresponds to the
hash key, not the internal count which is always `unsigned`).
* Source/WebKit/WebProcess/WebPage/ViewGestureGeometryCollector.cpp:
(WebKit::ViewGestureGeometryCollector::computeTextLegibilityScales):
Originally-landed-as: 289651.168@safari-7621-branch (fa20ee9ef67f).
rdar://148057968
Canonical link: https://commits.webkit.org/293235@main
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