From 605859cdd494b82fe206fe8d4737cda73cb6d467 Mon Sep 17 00:00:00 2001
From: John Lindgren <john@jlindgren.net>
Date: Sat, 10 Sep 2022 13:31:58 -0400
Subject: [PATCH] Fix loss of clarity with odd-sized centered image

---
 background-image.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/background-image.c b/background-image.c
index c765bdf..fc2ca0d 100644
--- a/background-image.c
+++ b/background-image.c
@@ -100,9 +100,14 @@ void render_background_image(cairo_t *cairo, cairo_surface_t *image,
 		break;
 	}
 	case BACKGROUND_MODE_CENTER:
+		/*
+		 * Align the unscaled image to integer pixel boundaries
+		 * in order to prevent loss of clarity (this only matters
+		 * for odd-sized images).
+		 */
 		cairo_set_source_surface(cairo, image,
-				(double)buffer_width / 2 - width / 2,
-				(double)buffer_height / 2 - height / 2);
+				(int)((double)buffer_width / 2 - width / 2),
+				(int)((double)buffer_height / 2 - height / 2));
 		break;
 	case BACKGROUND_MODE_TILE: {
 		cairo_pattern_t *pattern = cairo_pattern_create_for_surface(image);