cc::ScrollTree
Blink2862 Marras 2025

cc::ScrollTree

The source text provides an exhaustive technical overview of the Scroll Property Tree (cc::ScrollTree) within the Chromium compositor architecture, which is critical for enabling smooth, off-main-thread scrolling. It explains that the ScrollTree captures the hierarchy and properties of scrollable elements, utilizing individual ScrollNodes to store geometric data (like content and container bounds) and behavioral flags (such as whether scrolling is handled on the main thread or if scroll snapping is active). Furthermore, the text details how the ScrollTree works in close coordination with the Transform Tree to apply scroll-induced translations and how it manages the entire scrolling lifecycle, from input event hit-testing and scroll latching to handling overscroll and synchronizing scroll offsets back to the main thread (Blink) via commit mechanisms. This system ensures that complex features like pinch-zoom, sticky positioning, and scroll-linked animations operate correctly and efficiently on the compositor thread.

Jaksot(397)

The CSS anchor-scope Property: Design and Blink Layout

The CSS anchor-scope Property: Design and Blink Layout

The provided text exhaustively describes the CSS anchor-scope property, a critical addition to CSS Anchor Positioning designed to prevent naming conflicts when reusing components. This property define...

4 Joulu 20251h 5min

The Bicameral Mind and the Birth of Consciousness

The Bicameral Mind and the Birth of Consciousness

The provided text offers a comprehensive exploration of Julian Jaynes's Bicameral Mind Theory, which posits that humans, as recently as 3,000 years ago, lacked modern introspective consciousness. Jayn...

3 Joulu 202559min

Trees in Viz: Chrome's Centralized Compositing Engine

Trees in Viz: Chrome's Centralized Compositing Engine

The source details a significant re-architecture of the Chromium rendering pipeline, known as JellyMander, centered on the feature Trees in Viz (TiV). This change shifts the core task of frame composi...

30 Marras 202530min

PaintLayerPainter: Blink's Bridge from Layout to Rendering

PaintLayerPainter: Blink's Bridge from Layout to Rendering

The source material provides an exhaustive technical analysis of Blink’s PaintLayerPainter, the central coordinator responsible for executing the CSS painting algorithm to generate visual output. This...

30 Marras 202541min

Blink Property Trees: Scene Graph for Compositing

Blink Property Trees: Scene Graph for Compositing

The sources provide a comprehensive technical analysis of the Paint Property Tree Builder (PPTB) in Blink, which is the mechanism responsible for creating the crucial intermediate data structures know...

30 Marras 202540min

The Architecture of Chromium's Safe Callback Cancellation

The Architecture of Chromium's Safe Callback Cancellation

The source material provides a comprehensive examination of Chromium's CancelableCallback utility, which was introduced to allow for the safe and explicit cancellation of tasks that have been schedule...

29 Marras 202539min

B6: RenderProcessHost: Lifecycle and Architecture Management

B6: RenderProcessHost: Lifecycle and Architecture Management

The provided documents outline the essential functions of the RenderProcessHost (RPH), a crucial component within Chromium's multi-process architecture that resides in the browser process to manage a ...

28 Marras 202532min

B5: Platform View Architecture

B5: Platform View Architecture

The source provides an architectural overview of Layer 5 in Chromium, which is responsible for interfacing the browser’s content output with the native operating system view layer. This layer is struc...

28 Marras 202533min