From 834ee3dfd40fc2332aa67e06f3de14b394320cc6 Mon Sep 17 00:00:00 2001
From: Johan Malm <jgm323@gmail.com>
Date: Tue, 15 Mar 2022 21:30:25 +0000
Subject: [PATCH] output: fix incorrect call to private wlroots function

Use wlr_output_test() instead of output_ensure_buffer() which is not a
public function and only compiled when linking statically to wlroots.

Also wlr_output_rollback() on failed test.

Fixes issue #273

Backport of https://github.com/labwc/labwc/commit/5fd5024ca655d07d04cfb3e9c829c1764dd8ee01
---
 src/output.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/output.c b/src/output.c
index 3267d38f..0e28b058 100644
--- a/src/output.c
+++ b/src/output.c
@@ -9,6 +9,7 @@
 #define _POSIX_C_SOURCE 200809L
 #include "config.h"
 #include <assert.h>
+#include <wlr/types/wlr_output.h>
 #include <wlr/types/wlr_xdg_output_v1.h>
 #include <wlr/types/wlr_output_damage.h>
 #include <wlr/util/region.h>
@@ -1299,7 +1300,9 @@ handle_output_power_manager_set_mode(struct wl_listener *listener, void *data)
 		break;
 	case ZWLR_OUTPUT_POWER_V1_MODE_ON:
 		wlr_output_enable(event->output, true);
-		output_ensure_buffer(event->output);
+		if (!wlr_output_test(event->output)) {
+			wlr_output_rollback(event->output);
+		}
 		wlr_output_commit(event->output);
 		break;
 	}