From 95da3ee649fe42bb147789d5092e95c8f61fab77 Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Tue, 26 May 2020 11:34:17 +0200
Subject: [PATCH] Add support for the rotation property

---
 plane.c          | 4 ++++
 test/meson.build | 1 +
 test/test_prop.c | 3 +++
 3 files changed, 8 insertions(+)

diff --git a/plane.c b/plane.c
index 2874395..781b741 100644
--- a/plane.c
+++ b/plane.c
@@ -216,6 +216,10 @@ bool plane_apply(struct liftoff_plane *plane, struct liftoff_layer *layer,
 			    layer_prop->value == 0xFFFF) {
 				continue; /* Layer is completely opaque */
 			}
+			if (strcmp(layer_prop->name, "rotation") == 0 &&
+			    layer_prop->value == DRM_MODE_ROTATE_0) {
+				continue; /* Layer isn't rotated */
+			}
 			*compatible = false;
 			drmModeAtomicSetCursor(req, cursor);
 			return true;
diff --git a/test/meson.build b/test/meson.build
index 0cab819..7e96bdf 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -57,6 +57,7 @@ tests = {
 	],
 	'prop': [
 		'alpha',
+		'rotation',
 	],
 }
 
diff --git a/test/test_prop.c b/test/test_prop.c
index e9ec486..585b32f 100644
--- a/test/test_prop.c
+++ b/test/test_prop.c
@@ -55,6 +55,9 @@ int main(int argc, char *argv[]) {
 	if (strcmp(test_name, "alpha") == 0) {
 		require_prop_value = (uint16_t)(0.5 * 0xFFFF);
 		default_value = 0xFFFF; /* opaque */
+	} else if (strcmp(test_name, "rotation") == 0) {
+		require_prop_value = DRM_MODE_ROTATE_180;
+		default_value = DRM_MODE_ROTATE_0;
 	} else {
 		fprintf(stderr, "no such test: %s\n", test_name);
 		return 1;