util/transform: add wlr_output_transform_coords()

We hand-roll this in multiple places.

1 files changed, 8 insertions, 0 deletions

diff --git a/util/transform.c b/util/transform.c
index 4cc725fd..de3f8ef4 100644
--- a/util/transform.c
+++ b/util/transform.c
@@ -23,3 +23,11 @@ enum wl_output_transform wlr_output_transform_compose(
 	}
 	return flipped | rotated;
 }
+
+void wlr_output_transform_coords(enum wl_output_transform tr, int *x, int *y) {
+	if (tr & WL_OUTPUT_TRANSFORM_90) {
+		int tmp = *x;
+		*x = *y;
+		*y = tmp;
+	}
+}