viz::Display::DrawAndSwap
Blink2865 Loka 2025

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), drawing them using the appropriate renderer (Skia or software) and swapping the resulting buffer to the physical output surface. The method Display::DrawAndSwap(const DrawAndSwapParams& params) performs this work. The display scheduler calls DrawAndSwap for every frame it wants to display. On some platforms such as Lacros, DrawAndSwap uses the root surface size as the display’s size; the note on display size explains that display_->Resize sets current_surface_size_, and DrawAndSwap uses this value to determine whether the current frame needs a resize.

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gpu::SkiaOutputSurfaceImplOnGpu / gpu::CommandBuffer

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viz::SkiaRenderer

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Renderer that turns quads into Skia operations (recording DDLs / drawing to the output surface).

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viz::Display

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The display compositor that walks the aggregated render passes and issues draw commands for the final output.

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cc::LayerTreeHostImpl (Input Handler & Scroll Logic)

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blink::EventHandler (Blink core input handling)

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Scroll chain builder and overscroll chaining logic. Blink’s EventHandler is responsible for building the scroll chain (the sequence of nested scrollable ancestors) when the user scrolls an element . I...

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blink::ElasticOverscrollController

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viz::Surface / SurfaceAggregator

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Receives frames from one or more surfaces (main page and OOPIFs), aggregates them into a single display frame.

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