blink::PrePaintTreeWalk
Blink28610 Loka 2025

blink::PrePaintTreeWalk

cross‑frame pre‑paint traversal.

Runs in the InPrePaint lifecycle phase. Walks the entire layout tree starting at the root LocalFrameView, updating paint invalidation state and computing the context needed by the tree‑building step (e.g., event‑handler flags, fragmentation context, containers for out‑of‑flow). (Chromium Git Repositories)

Key types & fields

* void WalkTree(LocalFrameView& root_frame) — entry to pre‑paint traversal. (Chromium Git Repositories)

* struct PrePaintTreeWalkContext — per‑walk state (e.g., paint_invalidator_context, inside_blocking_touch_event_handler, fragmentation containers). These flags determine whether descendants need updates. (Chromium Git Repositories)

Hands off to: PaintPropertyTreeBuilder and then painting.

Jaksot(403)

blink::TransformPaintPropertyNode / ClipPaintPropertyNode / EffectPaintPropertyNode / ScrollPaintPropertyNode

blink::TransformPaintPropertyNode / ClipPaintPropertyNode / EffectPaintPropertyNode / ScrollPaintPropertyNode

The paint property trees captured during painting (transform, clip, effect/opacity, scroll offset) that define visual & coordinate‑space state.

21 Syys 202541min

blink::PaintController

blink::PaintController

Records drawing into a DisplayItemList, segmenting it into PaintChunks keyed by property‑tree state. (Output: a PaintArtifact.)

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blink::LayoutView (root of the layout tree)

blink::LayoutView (root of the layout tree)

Computes geometry for boxes when layout is dirty.

21 Syys 202539min

blink::StyleEngine / style resolver

blink::StyleEngine / style resolver

Recalculates computed styles that changed since last frame (if any).

21 Syys 202542min

blink::Page → blink::LocalFrame / LocalFrameView

blink::Page → blink::LocalFrame / LocalFrameView

The document’s frame & viewport; LocalFrameView is the scrollable root that triggers layout/paint when needed. provided source outlines the fundamental components of the Blink rendering engine, specif...

21 Syys 202539min

blink::WebViewImpl

blink::WebViewImpl

The source text provides an in-depth explanation of the blink::WebViewImpl class within Chromium's Blink rendering engine, characterizing it as the central control point on the renderer's main thread ...

20 Syys 202539min

cc::LayerTreeHost in Chromium's Compositor

cc::LayerTreeHost in Chromium's Compositor

The source provides an extensive technical explanation of the cc::LayerTreeHost class, which acts as the central main-thread component in the Chromium compositor architecture. It details how this comp...

20 Syys 202537min

cc:: Scheduler / SchedulerStateMachine

cc:: Scheduler / SchedulerStateMachine

Drives the frame loop on the compositor thread (BeginFrame → Animate → Commit → Draw), deciding when to ask Blink for a new frame or to draw with existing state.

20 Syys 202548min