perf(maskeditor): read the brush container rect once per move, not per axis - #15384
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…r axis `brushLeft` and `brushTop` each called `containerRef.getBoundingClientRect()`. Both depend on `store.cursorPoint`, which changes on every mousemove, so painting cost two forced synchronous layouts per event to obtain one rect. Collapsed into a single `brushPosition` computed that reads the rect once and returns both axes. The read stays inside a computed over `cursorPoint` on purpose: a DOMRect is not reactive, and re-reading it as the cursor moves is what keeps the offset correct while the mask editor dialog is dragged or resized. So this changes how many reads happen, not when — dialog move and resize behave exactly as before. Pinned by a test asserting one rect read per position; it fails on the current code with `expected "getBoundingClientRect" to be called 1 times, but got 2`.
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🎨 Storybook: ✅ Built — View Storybook🎭 Playwright: ✅ 1822 passed, 0 failed · 2 flaky📊 Browser Reports
📦 Bundle: 8.85 MB gzip 🔴 +447 BDetailsSummary
Category Glance App Entry Points — 3.71 kB (baseline 3.71 kB) • ⚪ 0 BMain entry bundles and manifests
Status: 1 added / 1 removed Graph Workspace — 1.37 MB (baseline 1.37 MB) • ⚪ 0 BGraph editor runtime, canvas, workflow orchestration
Status: 2 added / 2 removed / 1 unchanged Views & Navigation — 124 kB (baseline 124 kB) • ⚪ 0 BTop-level views, pages, and routed surfaces
Status: 13 added / 13 removed / 4 unchanged Panels & Settings — 566 kB (baseline 566 kB) • ⚪ 0 BConfiguration panels, inspectors, and settings screens
Status: 10 added / 10 removed / 16 unchanged User & Accounts — 27.7 kB (baseline 27.7 kB) • ⚪ 0 BAuthentication, profile, and account management bundles
Status: 6 added / 6 removed / 5 unchanged Editors & Dialogs — 125 kB (baseline 125 kB) • ⚪ 0 BModals, dialogs, drawers, and in-app editors
Status: 7 added / 7 removed / 1 unchanged UI Components — 67.1 kB (baseline 67.1 kB) • ⚪ 0 BReusable component library chunks
Status: 6 added / 6 removed / 8 unchanged Data & Services — 3.52 MB (baseline 3.52 MB) • 🔴 +558 BStores, services, APIs, and repositories
Status: 14 added / 14 removed / 3 unchanged Utilities & Hooks — 550 kB (baseline 550 kB) • ⚪ 0 BHelpers, composables, and utility bundles
Status: 18 added / 18 removed / 20 unchanged Vendor & Third-Party — 16.8 MB (baseline 16.8 MB) • ⚪ 0 BExternal libraries and shared vendor chunks Status: 18 unchanged Other — 14.2 MB (baseline 14.2 MB) • ⚪ 0 BBundles that do not match a named category
Status: 68 added / 68 removed / 217 unchanged ⚡ Performance Report
Show regressions
All metrics
Historical variance (last 15 runs)
Trend (last 15 commits on main)
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} |
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Path: .coderabbit.yaml Review profile: ASSERTIVE Plan: Pro Plus Run ID: 📒 Files selected for processing (1)
Included review availability: 0 reviews are currently available. Based on recent review activity, included reviews refill at 2 per hour. 📝 WalkthroughWalkthroughThe brush cursor now reads the container rectangle once per position update and uses it for both coordinates. Tests verify one read during rendering and another read after cursor movement. ChangesBrush cursor positioning
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to This localized change reduces redundant layout reads during mask-editor pointer movement while preserving brush positioning; no actionable merge-blocking risk remains after normal checks and review. Suggested reviewers: Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (1 inconclusive)
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Inline comments:
In `@src/components/maskeditor/BrushCursor.test.ts`:
- Around line 143-175: Extend the test “should read the container rect once per
position, not once per axis” to be asynchronous; after the initial assertion,
update mockStore.cursorPoint, await Vue’s nextTick(), and assert
getBoundingClientRect has been called exactly twice in total.
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Codecov Report✅ All modified and coverable lines are covered by tests. @@ Coverage Diff @@
## main #15384 +/- ##
==========================================
+ Coverage 78.97% 81.55% +2.58%
==========================================
Files 2209 1882 -327
Lines 111780 106876 -4904
Branches 33649 32490 -1159
==========================================
- Hits 88275 87166 -1109
+ Misses 23057 19362 -3695
+ Partials 448 348 -100
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Per CodeRabbit: the test asserted one read per mount but never that a move triggers a new one, so it only pinned half the guarantee. That half matters more than the one I wrote. The PR's safety argument is that read *timing* is unchanged, and a DOMRect is not reactive — so caching it across moves would satisfy "one read" while silently going stale the moment the dialog is dragged. Verified the extension catches exactly that: against a cached-rect variant it fails with `expected "getBoundingClientRect" to be called 2 times, but got 1 times`.
Contributor
Author
|
Good catch — done in 4591b18, and it is a better finding than "quick win" suggests. My test only pinned half the guarantee. This PR's whole safety argument is that read timing is unchanged: a Verified the extension catches it rather than assuming — against a cached-rect variant: So the test now pins both directions: not two reads per position, and not fewer than one read per move. 12 green, |
Contributor
Author
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Flagging a tension between this PR and #14472, which just landed a lint rule banning This PR does not satisfy that rule. It halves the reads; the surviving read is still inside That is deliberate rather than an oversight, and the reason is in the PR body: a The rule's actual remedy — derive from a store — needs a So: merging this leaves |
Contributor
Author
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#14472 has landed ( Four warnings, three files — as documented. Worth noting the other two trip the What this PR does to that list: So after this, promotion to |
jtydhr88
approved these changes
Aug 23, 2026
jtydhr88
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jtydhr88
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Tested locally, no regression, looks good to me
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Summary
brushLeftandbrushTopinBrushCursor.vueeach calledcontainerRef.getBoundingClientRect(). Both depend onstore.cursorPoint, which changes on every mousemove, so painting in the mask editor cost two forced synchronous layouts per pointer event to obtain one rect.The change
One
brushPositioncomputed reads the rect once and returns both axes;brushLeftandbrushTopread from it.Why this is safe
The read stays inside a computed over
cursorPointdeliberately. ADOMRectis not reactive, so nothing would invalidate a cached one — re-reading it as the cursor moves is precisely what keeps the offset correct while the mask editor dialog is dragged or resized.So this changes how many reads happen, not when. Dialog move and resize behave exactly as before, which is what makes it reviewable without an interactive pass over those paths.
Tests
Added
should read the container rect once per position, not once per axis, which spies on the container'sgetBoundingClientRect. Verified it fails on currentmain:12 tests green,
oxfmt --checkandoxlintclean,vue-tscreports nothing on either file.Review focus
should subtract container offset when containerRef is provided) still passes unchanged, which is the evidence that positioning is untouched.ResizeObserverplus a drag hook on the dialog, and it would alter behaviour rather than cost. Deliberately not attempted here.