Crate drmkit_scene_set 

Several scenes, one frame.

Port of src/scene/scene_set.{hpp,cpp}.

A LayerScene drives one CRTC. A SceneSet holds several, mirrors layers across them, and plans how many atomic commits a frame across them costs — which is the whole question, because one commit across every output is atomic and several are not, while one commit means one output’s refusal takes the rest down with it. See NarrowPolicy. The set plans; making the commits is the caller’s.

Mirrored layers

add_layer takes one source and a target per scene, so the same content reaches several outputs — a presentation mirrored to a projector, a status bar on every screen. Each target carries its own geometry, since the outputs rarely share a resolution.

Structs

LayerSpec

One layer across one or more scenes.

SceneSet

Several scenes, with mirrored layers and a plan for how a frame across them is committed.

SetLayerHandle

A handle to a layer that may span several scenes.

SlotState

What one slot in the set looks like this frame.

Target

Where one mirrored layer lands on one scene.

Enums

NarrowPolicy

How to split a frame across the outputs it touches.

SetError

Why a set operation was refused.

Functions

partition_for_policy

Group the engaged slots into one commit each.