blink::TransformPaintPropertyNode / ClipPaintPropertyNode / EffectPaintPropertyNode / ScrollPaintPropertyNode
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These are the nodes within those four trees. Every piece of painted content (a “paint chunk”) is associated with a tuple of (Transform, Clip, Effect, Scroll) nodes—its PropertyTreeState. This precisely defines where and how to draw it and enables efficient partial updates. (Chromium Git Repositories) What they carry (high‑value fields) Transform: a 4×4 matrix, a 3‑D transform origin, and flags like “flattens” (affects 3D→2D projection). (Chromium Git Repositories) Clip: clip rect (possibly rounded), optional clip path, and the associated transform space. (Chromium Git Repositories) Effect: opacity, blend mode, filters, masks—i.e., how content is composited into what’s beneath. (Chromium Git Repositories) Scroll: the scroll translation (and identity info) that ties content to a scroller. (Chromium Git Repositories) Change tracking Nodes track change types (PaintPropertyChangeType) so we can choose fast paths (e.g., update value without rebuilding topology). (Chromium Git Repositories) Hands off to: painting/recording with GraphicsContext + PaintController.
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