perf(capture): add SceneLens GPU streams and retained scene reuse

Use persistent privacy-filtered capture targets and client-owned GPU buffers with fence completion, backpressure, negotiated frame rates and shared-memory fallback.

Invalidate output views on scene changes while preserving inactive-window callbacks and capture revocation. Include OBS memory-mask negotiation and native pixel, transport and recording regressions.

compositor/src/render/scene.rs

@@ -7,26 +7,17 @@ use smithay::backend::renderer::utils::CommitCounter;
 
 use super::{
     AnimatedWindowRenderElement, ConstrainAlign, ConstrainBehavior, ConstrainReference,
-    CropRenderElement, CursorImageStatus, CursorImageSurfaceData, Duration, Ferese,
-    FrameEffectMetrics, GlesRenderer, Layer, LayerSurface, Logical, MaterialSurface,
-    MemoryRenderBufferRenderElement, Output, Physical, Point, PopupManager, Rectangle, Relocate,
-    RelocateRenderElement, RenderElementKind, Renderer, RescaleRenderElement, Resource,
-    RoundedRect, Size, SolidColorRenderElement, Transform, WaylandSurfaceRenderElement,
-    append_material_surface, backdrop, constrain_space_element, corner_program,
-    layer_map_for_output, material_element, overview_strip_elements,
-    render_elements_from_surface_tree, resize_content_behavior, rounded_visual_rect,
-    rounded_window_elements, window_border_element, window_corner_shape, window_shadow_element,
-    window_tint_element, with_states,
+    CropRenderElement, CursorImageStatus, CursorImageSurfaceData, Ferese, FrameEffectMetrics,
+    GlesRenderer, Layer, LayerSurface, Logical, MaterialSurface, MemoryRenderBufferRenderElement,
+    Output, Physical, Point, PopupManager, Rectangle, Relocate, RelocateRenderElement,
+    RenderElementKind, Renderer, RescaleRenderElement, Resource, RoundedRect, Size,
+    SolidColorRenderElement, Transform, WaylandSurfaceRenderElement, append_material_surface,
+    backdrop, constrain_space_element, corner_program, layer_map_for_output, material_element,
+    overview_strip_elements, render_elements_from_surface_tree, resize_content_behavior,
+    rounded_visual_rect, rounded_window_elements, window_border_element, window_corner_shape,
+    window_shadow_element, window_tint_element, with_states,
 };
 
-pub(crate) fn animated_window_elements(
-    state: &mut Ferese,
-    renderer: &mut GlesRenderer,
-    output: &Output,
-) -> Vec<AnimatedWindowRenderElement> {
-    output_elements(state, renderer, output, true)
-}
-
 pub(crate) fn frame_effect_metrics(
     _elements: &[AnimatedWindowRenderElement],
     _scale: f64,
@@ -34,17 +25,6 @@ pub(crate) fn frame_effect_metrics(
     FrameEffectMetrics
 }
 
-pub(crate) fn output_elements(
-    state: &mut Ferese,
-    renderer: &mut GlesRenderer,
-    output: &Output,
-    include_cursor: bool,
-) -> Vec<AnimatedWindowRenderElement> {
-    let frame = state.sample_frame(output, Duration::ZERO);
-
-    sampled_output_elements(state, renderer, output, include_cursor, &frame)
-}
-
 pub(crate) fn sampled_output_elements(
     state: &mut Ferese,
     renderer: &mut GlesRenderer,