cc::Viewport: Engine of Compositor Interaction
Blink28627 Syys 2025

cc::Viewport: Engine of Compositor Interaction

The source provides a detailed architectural examination of Chromium’s cc::Viewport class, which is a critical, stateful controller within the rendering engine's compositor responsible for all high-performance viewport interactions. It explains that the class manages the complexity of the dual-viewport model, which separates the static Layout Viewport from the user-visible Visual Viewport to enable smooth pinch-zooming without expensive relayouts. The analysis traces how cc::Viewport facilitates compositor-threaded scrolling and zooming by translating user input gestures into highly efficient mutations of the Property Trees, specifically the ScrollTree and TransformTree. Ultimately, the text establishes that this specialized component is the engine enabling a fluid user experience by isolating high-frequency tasks from the main rendering thread.

Jaksot(404)

View Transition Deep Dive: Lifecycle and Implementation

View Transition Deep Dive: Lifecycle and Implementation

The sources provide a detailed technical examination of the lifecycle of a View Transition in the Chromium browser engine, outlining the complex coordination across various subsystems like Blink, the ...

19 Marras 202531min

LayerTreeHost Core Lifecycle and Commit Methods

LayerTreeHost Core Lifecycle and Commit Methods

The provided text comprises extensive documentation of the LayerTreeHost class, a foundational component in a compositing system (likely Chromium's cc layer). It thoroughly details the object's lifecy...

18 Marras 202543min

Layer Tree Host Impl: Core Compositor Pipeline

Layer Tree Host Impl: Core Compositor Pipeline

The sources provide detailed excerpts from the C++ implementation of the LayerTreeHostImpl class, a fundamental component of the Chromium compositor that manages rendering operations and state on the ...

17 Marras 202542min

cc Elastic Overscroll Architecture Deep Dive

cc Elastic Overscroll Architecture Deep Dive

The source provides an architectural overview of how elastic overscroll (the "rubber-banding" effect) is implemented within the Chromium Compositor (CC) for both the main viewport and individual scrol...

16 Marras 202533min

SyncedProperty: Cross-Thread Compositor Synchronization

SyncedProperty: Cross-Thread Compositor Synchronization

The source provides a detailed technical exploration of SyncedProperty, a critical synchronization mechanism within Chromium's compositor (cc) designed to manage properties updated concurrently on bot...

16 Marras 202532min

Blink's PendingLayer: Bridge Between Paint and Compositor

Blink's PendingLayer: Bridge Between Paint and Compositor

The document provides an extensive technical overview of the PendingLayer class, a critical internal component within Blink’s Composite After Paint (CAP) architecture. PendingLayer acts as a liaison, ...

15 Marras 202530min

RasterSource and Rendering Pipeline

RasterSource and Rendering Pipeline

The source provides an extensive technical overview of the RasterSource concept within the Chromium browser's rendering pipeline. This component serves as a crucial, immutable, and thread-safe contain...

14 Marras 202532min

Containing Blocks in CSS and Blink Layout

Containing Blocks in CSS and Blink Layout

The source provides a highly technical, in-depth analysis of the concept of containing blocks in CSS layout, explaining how these invisible boundaries determine the sizing and positioning of elements,...

13 Marras 202554min