compositor-drm: Add planes-only mode to state proposal

Add a new mode, which attempts to construct a scene exclusively using
planes. This is a building block for incrementally testing and
constructing state: in the plane-only mode, we test the state exactly
once, when we have constructed a full set of planes and want to know if
it works or not.

When using the renderer, we need to incrementally test views one by one
to see if they will work on planes, falling back to the renderer if not.
This test is different, since the scanout plane will be occupied by the
renderer's buffer. Testing using the renderer or client buffers may have
completely different characteristics, so we need two passes: first,
constructing a state with only planes and testing if that succeeds,
falling back later to a mixed renderer/plane mode which tests
incrementally.

This implements the first mode, and preferentially attempts to use it.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

libweston/compositor-drm.c

@@ -1944,6 +1944,7 @@ drm_output_assign_state(struct drm_output_state *state,
 enum drm_output_propose_state_mode {
 	DRM_OUTPUT_PROPOSE_STATE_MIXED, /**< mix renderer & planes */
 	DRM_OUTPUT_PROPOSE_STATE_RENDERER_ONLY, /**< only assign to renderer & cursor */
+	DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY, /**< no renderer use, only planes */
 };
 
 static struct drm_plane_state *
@@ -3318,6 +3319,7 @@ drm_output_propose_state(struct weston_output *output_base,
 	struct weston_view *ev;
 	pixman_region32_t surface_overlap, renderer_region, occluded_region;
 	bool planes_ok = (mode != DRM_OUTPUT_PROPOSE_STATE_RENDERER_ONLY);
+	bool renderer_ok = (mode != DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY);
 	int ret;
 
 	assert(!output->state_last);
@@ -3431,6 +3433,14 @@ drm_output_propose_state(struct weston_output *output_base,
 			continue;
 		}
 
+		/* We have been assigned to the primary (renderer) plane:
+		 * check if this is OK, and add ourselves to the renderer
+		 * region if so. */
+		if (!renderer_ok) {
+			pixman_region32_fini(&clipped_view);
+			goto err_region;
+		}
+
 		pixman_region32_union(&renderer_region,
 				      &renderer_region,
 				      &clipped_view);
@@ -3446,6 +3456,9 @@ drm_output_propose_state(struct weston_output *output_base,
 
 	return state;
 
+err_region:
+	pixman_region32_fini(&renderer_region);
+	pixman_region32_fini(&occluded_region);
 err:
 	drm_output_state_free(state);
 	return NULL;
@@ -3462,9 +3475,13 @@ drm_assign_planes(struct weston_output *output_base, void *repaint_data)
 	struct weston_view *ev;
 	struct weston_plane *primary = &output_base->compositor->primary_plane;
 
-	if (!b->sprites_are_broken)
+	if (!b->sprites_are_broken) {
 		state = drm_output_propose_state(output_base, pending_state,
-						 DRM_OUTPUT_PROPOSE_STATE_MIXED);
+						 DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY);
+		if (!state)
+			state = drm_output_propose_state(output_base, pending_state,
+							 DRM_OUTPUT_PROPOSE_STATE_MIXED);
+	}
 
 	if (!state)
 		state = drm_output_propose_state(output_base, pending_state,