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perf(canvas): avoid zoom preview backing refreshes

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This commit is contained in:
Danila Poyarkov 2026-05-20 00:51:37 +03:00
parent fbc3b8b282
commit d777fddfe9
1 changed files with 30 additions and 9 deletions
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39
packages/core/src/canvas/renderer/pipeline.ts
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@ -300,18 +300,28 @@ function updateSceneBackingPreviewState(r: SkiaRenderer, layer: RenderLayer): vo
}
}
function backingCoverageContainsLiveViewport(
r: SkiaRenderer,
sceneVersion: number,
allowStaleZoom: boolean
): boolean {
function backingMetadataMatches(r: SkiaRenderer, sceneVersion: number): boolean {
const backing = r.sceneBacking
return !!(
backing &&
backing.pageId === r.pageId &&
backing.sceneVersion === sceneVersion &&
backing.positionPreviewVersion === r.scenePicturePositionPreviewVersion
)
}
function backingScreenCoverageContainsViewport(r: SkiaRenderer): boolean {
const backing = r.sceneBacking
if (!backing) return false
if (backing.pageId !== r.pageId) return false
if (backing.sceneVersion !== sceneVersion) return false
if (backing.positionPreviewVersion !== r.scenePicturePositionPreviewVersion) return false
if (!allowStaleZoom && Math.abs(backing.zoom - r.zoom) > 0.0001) return false
const scale = r.zoom / backing.zoom
const x = r.panX - backing.panX * scale
const y = r.panY - backing.panY * scale
return x <= 0 && y <= 0 && x + backing.width * scale >= r.viewportWidth && y + backing.height * scale >= r.viewportHeight
}
function backingWorldCoverageContainsLiveViewport(r: SkiaRenderer): boolean {
const backing = r.sceneBacking
if (!backing) return false
const liveX = -r.panX / r.zoom
const liveY = -r.panY / r.zoom
const liveW = r.viewportWidth / r.zoom
@ -324,6 +334,17 @@ function backingCoverageContainsLiveViewport(
)
}
function backingCoverageContainsLiveViewport(
r: SkiaRenderer,
sceneVersion: number,
allowStaleZoom: boolean
): boolean {
if (!backingMetadataMatches(r, sceneVersion)) return false
const crispZoom = Math.abs((r.sceneBacking?.zoom ?? r.zoom) - r.zoom) <= 0.0001
if (allowStaleZoom && backingScreenCoverageContainsViewport(r)) return true
return crispZoom && backingWorldCoverageContainsLiveViewport(r)
}
function drawSceneBacking(
r: SkiaRenderer,
canvas: Canvas,