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(396)

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Blink's Graph Data Structures and Traversals

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turns chunks into compositor layers & updates cc property trees. Consumes the new PaintArtifact and does the layerization and property‑tree updates required for compositor draw. It supports fast paths...

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blink::PaintChunk and blink::DisplayItemList

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grouping and content. PaintChunk: groups sequential display items that share the same property‑tree state and cull/visibility; it’s the unit we layerize and invalidate.DisplayItemList: the recorded Sk...

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the immutable “what to draw” package for this frame. A PaintArtifact is the product of Blink painting: a DisplayItemList plus an ordered vector of PaintChunks. It is immutable post‑creation and design...

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blink::PaintController

builds the display list + paint chunks and manages caching. As painters call into GraphicsContext, they also drive a PaintController which groups drawing into display items and paint chunks (each keye...

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