Chrome Compositor Animation Architecture (cc)
Blink28615 Okt 2025

Chrome Compositor Animation Architecture (cc)

The sources provide an extensive architectural overview of the Chrome Compositor Animation (cc) subsystem, which is responsible for executing visual animations like transforms and opacity changes efficiently. This architecture relies on a dual-thread model, where the main thread prepares animation data, but the actual animation ticking, interpolation, and property updates happen on the dedicated compositor thread (impl thread) to ensure smooth, "hitch-free" rendering independent of main thread activity. Key components described include the AnimationHost, which coordinates animations on each thread, and the hierarchy of classes—Animation, KeyframeEffect, and KeyframeModel—that represent the animated properties and their curves. The sources detail the synchronization lifecycle of animations from creation on the main thread through the commit process to continuous per-frame ticking on the impl thread, while also distinguishing compositor-accelerated animations from those that must run on the main thread. Finally, the text explores performance strategies like GPU acceleration, frame rate synchronization, and support for modern features such as Scroll-Linked Animations and the Animation Worklet API.

Episoder(397)

Chrome Compositor LayerTree Architecture and Input Handling

Chrome Compositor LayerTree Architecture and Input Handling

The text provides a detailed overview of the architecture and function of Chrome's Compositor (cc) component, specifically focusing on the core data structures: LayerTree and LayerTreeImpl. It explain...

7 Okt 202527min

viz::Display::DrawAndSwap

viz::Display::DrawAndSwap

In Chrome’s rendering pipeline, the Viz service in the GPU process owns a viz::Display object. A Display is responsible for taking aggregated CompositorFrames (produced by the SurfaceAggregator), draw...

5 Okt 202528min

Chrome RenderingNG: Paint Artifact and Compositor Architecture

Chrome RenderingNG: Paint Artifact and Compositor Architecture

source provides an extensive, lecture-style examination of Chrome’s RenderingNG pipeline, specifically focusing on the roles of the PaintArtifact and the PaintArtifactCompositor. The text explains tha...

5 Okt 202534min

Browser Rendering: Calculating Draw Properties

Browser Rendering: Calculating Draw Properties

The source provides an extensive explanation of the internal browser rendering mechanism used in Blink and Chrome, specifically focusing on the CalculateDrawProperties algorithm. This process translat...

5 Okt 202539min

Chrome Compositor Transform Updates on Scroll

Chrome Compositor Transform Updates on Scroll

These sources provide an extensive technical explanation of how the Chrome compositor manages dynamic properties, specifically focusing on transformations and scrolling, using a structure called Prope...

4 Okt 202532min

Chrome Compositor Architecture: LayerTreeHost and LayerTreeHostImpl

Chrome Compositor Architecture: LayerTreeHost and LayerTreeHostImpl

The sources provide an extensive architectural overview of the Chrome cc compositor module, focusing on the collaboration between three critical classes: LayerTreeHost (LTH), LayerTreeHostImpl (LTHI),...

3 Okt 202534min

Chromium Blink's Layer Recycle Tree Optimization

Chromium Blink's Layer Recycle Tree Optimization

The sources provide an extensive technical explanation of the Chromium/Blink rendering pipeline, focusing specifically on the compositor's layer trees and a performance optimization known as the Recyc...

3 Okt 202529min

Chromium Compositor's CalculateDrawProperties: Scrolling and Overscroll

Chromium Compositor's CalculateDrawProperties: Scrolling and Overscroll

The sources provide an extremely detailed, line-by-line breakdown of the Chromium compositor function CalculateDrawProperties, explaining how it prepares the active layer tree for rendering. A primary...

3 Okt 202530min

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