perf(plugins): remove redundant getImageData/putImageData in ambient-mode - #4665
perf(plugins): remove redundant getImageData/putImageData in ambient-mode#4665bonkedbythonk wants to merge 1 commit into
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Included review availability: Your plan provides up to 10 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe ambient mode renderer now creates trailing motion blur by drawing video frames with partial alpha on an uncleared canvas. It replaces pixel readback state with ChangesAmbient mode blur rendering
Estimated code review effort: 2 (Simple) | ~5–15 minutes Merge Risk: ⚪ Minimal · up to This localized change removes redundant per-frame canvas pixel readback while preserving the existing ambient-mode blur behavior through alpha blending. Typecheck, lint, visual validation, and CPU checks passed, so no actionable merge-blocking risk remains. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1 files. ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@src/plugins/ambient-mode/index.ts`:
- Around line 129-131: Update the globalAlpha calculation in the ambient
renderer to handle interpolationTime equal to zero before assignment, rejecting
it or substituting a safe finite alpha so Canvas never receives Infinity and
trailing blur behavior remains intact.
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src/plugins/ambient-mode/index.ts
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…mode putImageData ignores globalAlpha and compositing entirely (a direct pixel write per spec), so the get/putImageData round-trip on every frame was rewriting the canvas with pixels identical to what was already there - the canvas is never cleared, so the previous frame persists on its own. The getImageData call was pure CPU readback (forcing willReadFrequently's software rendering path) for zero visual effect, running ~30x/sec whenever ambient mode is active with a video background. Removing it keeps the same trailing-blur math via plain globalAlpha-blended drawImage, just without the pointless roundtrip - noticeably lower CPU/heat with no visual change.
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Summary
putImageDataignoresglobalAlpha/compositing entirely (it's a direct pixel write per spec), so thegetImageData/putImageDataround-trip on every frame of the video-mode blur effect was rewriting the canvas with pixels identical to what was already there - the canvas is never cleared, so the previous frame persists on its own.The
getImageDatacall was pure CPU readback (forcing thewillReadFrequentlysoftware-rendering path) for zero visual effect, running ~30x/sec whenever ambient mode is active with a video background - noticeably raising CPU usage and heat.Fix
Removes the round-trip and keeps the same trailing-blur math via a plain
globalAlpha-blendeddrawImage, letting the canvas's own persistence do what the manual pixel copy was redundantly doing. No visual change.Test plan
pnpm typecheck/pnpm lintpassSummary by CodeRabbit