From 7ae10e078a3d5eaa669c020f137a0e9ade65e27d Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Thu, 21 Oct 2021 15:02:09 +0200
Subject: [PATCH] render/timeline: add wlr_render_timeline_import

---
 include/wlr/render/timeline.h |  5 +++++
 render/timeline.c             | 17 +++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/include/wlr/render/timeline.h b/include/wlr/render/timeline.h
index f4d07e634..dc799c8d7 100644
--- a/include/wlr/render/timeline.h
+++ b/include/wlr/render/timeline.h
@@ -30,6 +30,11 @@ struct wlr_render_timeline;
  * Create a new synchronization timeline.
  */
 struct wlr_render_timeline *wlr_render_timeline_create(int drm_fd);
+/**
+ * Import a timeline from a drm_syncobj FD.
+ */
+struct wlr_render_timeline *wlr_render_timeline_import(int drm_fd,
+	int drm_syncobj_fd);
 /**
  * Destroy a synchronization timeline.
  */
diff --git a/render/timeline.c b/render/timeline.c
index a69f06d18..df98b5325 100644
--- a/render/timeline.c
+++ b/render/timeline.c
@@ -26,6 +26,23 @@ struct wlr_render_timeline *wlr_render_timeline_create(int drm_fd) {
 	return timeline;
 }
 
+struct wlr_render_timeline *wlr_render_timeline_import(int drm_fd,
+		int drm_syncobj_fd) {
+	struct wlr_render_timeline *timeline = calloc(1, sizeof(*timeline));
+	if (timeline == NULL) {
+		return NULL;
+	}
+	timeline->drm_fd = drm_fd;
+
+	if (drmSyncobjFDToHandle(drm_fd, drm_syncobj_fd, &timeline->handle) != 0) {
+		wlr_log_errno(WLR_ERROR, "drmSyncobjFDToHandle failed");
+		free(timeline);
+		return NULL;
+	}
+
+	return timeline;
+}
+
 void wlr_render_timeline_destroy(struct wlr_render_timeline *timeline) {
 	drmSyncobjDestroy(timeline->drm_fd, timeline->handle);
 	free(timeline);