From 7d32783d9e2e314e83655a5982d6986e83a4db81 Mon Sep 17 00:00:00 2001
From: Yuxuan Shui <yshuiv7@gmail.com>
Date: Tue, 8 Sep 2020 07:04:06 +0100
Subject: [PATCH] options: warn when dual-kawase blur is chosen on unsupported
 backends

Closes #464

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>
---
 src/options.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/options.c b/src/options.c
index 7bd6865..029c949 100644
--- a/src/options.c
+++ b/src/options.c
@@ -953,6 +953,11 @@ bool get_cfg(options_t *opt, int argc, char *const *argv, bool shadow_enable,
 			         "capping to 20.");
 			opt->blur_strength = 20;
 		}
+		if (!opt->experimental_backends) {
+			log_warn("Dual-kawase blur is not implemented by the legacy "
+			         "backends, you must use the `experimental-backends` "
+			         "option`.");
+		}
 	}
 
 	if (opt->resize_damage < 0) {