cc::LayerImpl: Compositor Layer Deep Dive
Blink2861 Marras 2025

cc::LayerImpl: Compositor Layer Deep Dive

The sources provide an exhaustive technical explanation of the cc::LayerImpl class, which is the core representation of a visual element within Chromium's multi-threaded rendering pipeline. These layers exist exclusively on the compositor thread and are created or updated during the commit process from the main thread, operating in a layer list mode that leverages four types of property trees (Transform, Clip, Effect, Scroll) to manage hierarchical relationships and properties instead of traditional parent-child pointers. The layer objects are crucial for the performance optimization of drawing frames, as they store geometry, manage input regions for hit testing, and are instrumental in the asynchronous tiling and rasterization system (especially through PictureLayerImpl) and the three-tree model (Active, Pending, Recycle) used for frame staging and reuse. Ultimately, each layer's state is used in the quad generation step to produce a viz::CompositorFrame for the display compositor.


Jaksot(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 Loka 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 Loka 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 Loka 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 Loka 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 Loka 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 Loka 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 Loka 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 Loka 202530min