From f53ac953d6713cfd7250fd19cfe2b1ddc6ae6aaf Mon Sep 17 00:00:00 2001
From: Simon Sapin <simon.sapin@exyr.org>
Date: Thu, 14 May 2020 10:02:23 +0200
Subject: [PATCH] Fix incorrect sign background-image rectangle computation

---
 components/layout_2020/display_list/background.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/components/layout_2020/display_list/background.rs b/components/layout_2020/display_list/background.rs
index e1871e5d164..799ac40d809 100644
--- a/components/layout_2020/display_list/background.rs
+++ b/components/layout_2020/display_list/background.rs
@@ -21,6 +21,7 @@ pub(super) struct BackgroundLayer {
     pub repeat: bool,
 }
 
+#[derive(Debug)]
 struct Layout1DResult {
     repeat: bool,
     bounds_origin: f32,
@@ -250,7 +251,8 @@ fn layout_1d(
             let tile_stride = *tile_size + tile_spacing;
             let offset = position - painting_area_origin;
             let bounds_origin = position - tile_stride * (offset / tile_stride).ceil();
-            let bounds_size = painting_area_size - bounds_origin - painting_area_origin;
+            let bounds_end = painting_area_origin + painting_area_size;
+            let bounds_size = bounds_end - bounds_origin;
             Layout1DResult {
                 repeat: true,
                 bounds_origin,