Chromium Compositor PictureLayerImpl Deep Dive
Blink28631 Okt 2025

Chromium Compositor PictureLayerImpl Deep Dive

The source provides an extensive technical overview of the cc::PictureLayerImpl class, a critical component in the rendering architecture of Chromium's compositor, responsible for processing content on the compositor thread. This class manages the complex process of tiled rasterization, breaking a layer's drawing commands (from the main thread) into Tile textures at various scales for display performance, particularly during zooming and animation. The text details the class's fields, including the PictureLayerTilingSet (which holds multiple resolution tilings), scale factors (ideal vs. raster), and invalidation tracking. Furthermore, it explains key methods like PushPropertiesTo (transferring state to the active layer) and the AppendQuads process, which converts ready tiles into draw commands for the final rendering output, while managing optimizations for animated images, solid colors, and LCD text.

Avsnitt(397)

gpu::SkiaOutputSurfaceImplOnGpu / gpu::CommandBuffer

gpu::SkiaOutputSurfaceImplOnGpu / gpu::CommandBuffer

Bridges Skia’s recorded commands to the GPU command buffer; submits and SwapBuffers to present. (Backend: GL/Vulkan/Metal via GPU process.)

23 Sep 202532min

viz::SkiaRenderer

viz::SkiaRenderer

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

23 Sep 202552min

viz::Display

viz::Display

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

23 Sep 202538min

cc::LayerTreeHostImpl (Input Handler & Scroll Logic)

cc::LayerTreeHostImpl (Input Handler & Scroll Logic)

Scroll processing and overscroll detection in the compositor. The LayerTreeHostImpl in cc implements the compositor-thread InputHandler that processes gesture scroll updates and flings. It manages the...

23 Sep 202527min

blink::EventHandler (Blink core input handling)

blink::EventHandler (Blink core input handling)

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...

23 Sep 202526min

blink::ElasticOverscrollController

blink::ElasticOverscrollController

Overscroll orchestration and animation. This Blink-side controller manages the rubber-banding (elastic stretch and rebound) effect when a scrollable area is overscrolled. It observes gesture scroll ev...

23 Sep 202526min

viz::Surface / SurfaceAggregator

viz::Surface / SurfaceAggregator

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

23 Sep 202535min

viz::CompositorFrameSink (client side)

viz::CompositorFrameSink (client side)

The submission interface used by cc to hand the frame to viz.

23 Sep 202531min

Populärt inom Teknik

uppgang-och-fall
elbilsveckan
market-makers
bilar-med-sladd
natets-morka-sida
rss-elektrikerpodden
rss-laddstationen-med-elbilen-i-sverige
skogsforum-podcast
bosse-bildoktorn-och-hasse-p
rss-veckans-ai
rss-uppgang-och-fall
bli-saker-podden
rss-en-ai-till-kaffet
rss-sogeti-sweden-podcasts
rss-ai-med-katarina-gospic-och-viggo-cavling
rss-technokratin
garagehang
rss-digitala-influencer-podden
rss-it-sakerhetspodden
rss-fabriken-2