backend/drm: support updating cursor when session is paused

backend/drm/backend.c

@@ -91,6 +91,8 @@ static void session_signal(struct wl_listener *listener, void *data) {
 			struct wlr_drm_plane *plane = conn->crtc->cursor;
 			drm->iface->crtc_set_cursor(drm, conn->crtc,
 				(plane && plane->cursor_enabled) ? plane->cursor_bo : NULL);
+			drm->iface->crtc_move_cursor(drm, conn->crtc, conn->cursor_x,
+				conn->cursor_y);
 		}
 	} else {
 		wlr_log(L_INFO, "DRM fd paused");

backend/drm/drm.c

@@ -517,10 +517,6 @@ static bool wlr_drm_connector_set_cursor(struct wlr_output *output,
 	struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend;
 	struct wlr_drm_renderer *renderer = &drm->renderer;
 
-	if (!drm->session->active) {
-		return false;
-	}
-
 	struct wlr_drm_crtc *crtc = conn->crtc;
 	if (!crtc) {
 		return false;
@@ -540,6 +536,9 @@ static bool wlr_drm_connector_set_cursor(struct wlr_output *output,
 	if (!buf && update_pixels) {
 		// Hide the cursor
 		plane->cursor_enabled = false;
+		if (!drm->session->active) {
+			return true;
+		}
 		return drm->iface->crtc_set_cursor(drm, crtc, NULL);
 	}
 	plane->cursor_enabled = true;
@@ -637,6 +636,10 @@ static bool wlr_drm_connector_set_cursor(struct wlr_output *output,
 
 	gbm_bo_unmap(bo, bo_data);
 
+	if (!drm->session->active) {
+		return true;
+	}
+
 	bool ok = drm->iface->crtc_set_cursor(drm, crtc, bo);
 	if (ok) {
 		wlr_output_update_needs_swap(output);
@@ -648,9 +651,6 @@ static bool wlr_drm_connector_move_cursor(struct wlr_output *output,
 		int x, int y) {
 	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
 	struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend;
-	if (!drm->session->active) {
-		return false;
-	}
 	if (!conn->crtc) {
 		return false;
 	}
@@ -670,6 +670,13 @@ static bool wlr_drm_connector_move_cursor(struct wlr_output *output,
 		box.y -= plane->cursor_hotspot_y;
 	}
 
+	conn->cursor_x = box.x;
+	conn->cursor_y = box.y;
+
+	if (!drm->session->active) {
+		return true;
+	}
+
 	bool ok = drm->iface->crtc_move_cursor(drm, conn->crtc, box.x, box.y);
 	if (ok) {
 		wlr_output_update_needs_swap(output);

include/backend/drm/drm.h

@@ -123,8 +123,8 @@ struct wlr_drm_connector {
 
 	union wlr_drm_connector_props props;
 
-	uint32_t width;
-	uint32_t height;
+	uint32_t width, height;
+	int32_t cursor_x, cursor_y;
 
 	drmModeCrtc *old_crtc;