From a3b4d2dfc9e0a53cdd3850bc5ae3528564cd10a8 Mon Sep 17 00:00:00 2001
From: Robert Mader <robert.mader@collabora.com>
Date: Mon, 18 Sep 2023 20:40:45 +0200
Subject: [PATCH] clutter/paint-volume: Avoid amplifying small floating-point
 errors

In order to avoid adding whole pixels to paint boxes in case of small
floating point errors.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3286>
---
 clutter/clutter/clutter-paint-volume.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/clutter/clutter/clutter-paint-volume.c b/clutter/clutter/clutter-paint-volume.c
index cf725573a..a667ffd2d 100644
--- a/clutter/clutter/clutter-paint-volume.c
+++ b/clutter/clutter/clutter-paint-volume.c
@@ -1069,6 +1069,10 @@ _clutter_paint_volume_get_stage_paint_box (const ClutterPaintVolume *pv,
        * in this case.
        */
       clutter_paint_volume_free (&projected_pv);
+      clutter_round_to_256ths (&box->x1);
+      clutter_round_to_256ths (&box->y1);
+      clutter_round_to_256ths (&box->x2);
+      clutter_round_to_256ths (&box->y2);
       box->x1 = floorf (box->x1);
       box->y1 = floorf (box->y1);
       box->x2 = ceilf (box->x2);