ECS Components

Components are the data layer of the ECS architecture. More...

Classes
struct	donner::svg::components::DirtyFlagsComponent
	Tracks which computed properties are stale and need recomputation after a DOM mutation. More...

Detailed Description

Components are the data layer of the ECS architecture.

Each component holds a specific piece of state and is attached to an entity. Components contain no logic — systems read and write them.

Components are typically small structs or classes that store the results of a computation stage (e.g., computed styles, resolved transforms, cached geometry). They are attached to entities via the entt registry and accessed by systems during processing.

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Class Documentation

donner::svg::components::DirtyFlagsComponent

struct donner::svg::components::DirtyFlagsComponent

Tracks which computed properties are stale and need recomputation after a DOM mutation.

Attached to entities that have been mutated since the last render. Systems check these flags during createComputedComponents() to skip clean entities and only recompute what changed.

Public Types
enum	Flags : uint16_t {   None = 0 ,   Style = 1 << 0 ,   Layout = 1 << 1 ,   Transform = 1 << 2 ,   WorldTransform = 1 << 3 ,   Shape = 1 << 4 ,   Paint = 1 << 5 ,   Filter = 1 << 6 ,   RenderInstance = 1 << 7 ,   ShadowTree = 1 << 8 ,   TextGeometry = 1 << 9 ,   StyleCascade = Style | Paint | Filter | RenderInstance ,   LayoutCascade = Layout | Transform | WorldTransform | RenderInstance ,   All = 0xFFFF }
	Individual dirty flags for each computation stage. More...
Public Member Functions
void	mark (uint16_t f)
	Mark additional flags as dirty.
bool	test (uint16_t f) const
	Test whether any of the given flags are set.
void	clear (uint16_t f)
	Clear specific flags.
void	clearAll ()
	Clear all flags.
Public Attributes
uint16_t	flags = Flags::None
	Bitfield of dirty flags.

Member Enumeration Documentation

Flags

enum donner::svg::components::DirtyFlagsComponent::Flags : uint16_t

Individual dirty flags for each computation stage.

Enumerator
Style	ComputedStyleComponent needs recomputation.
Layout	ComputedSizedElementComponent / viewBox needs recomputation.
Transform	ComputedLocalTransformComponent needs recomputation.
WorldTransform	ComputedAbsoluteTransformComponent needs recomputation.
Shape	ComputedPathComponent needs recomputation.
Paint	ResolvedPaintServer (fill/stroke) needs re-resolution.
Filter	Filter effect chain needs re-resolution.
RenderInstance	RenderingInstanceComponent needs update.
ShadowTree	Shadow tree needs re-instantiation.
TextGeometry	ComputedTextGeometryComponent needs recomputation.
StyleCascade	Compound flag: style change that may affect paint, filter, and render instance.
LayoutCascade	Compound flag: layout change that affects transforms and render instance.
All	All flags set.