backends/native: Minor refactor

Refactor code so that variables don't depend the on motion line
content, but the other way around. This makes it clearer what each
vector means.

This has no functional changes.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2803>
(cherry picked from commit 34a9141a6c975e26b12ba5d5c6739b3d9df6a2e4)

1 files changed, 6 insertions, 6 deletions

diff --git a/src/backends/native/meta-seat-impl.c b/src/backends/native/meta-seat-impl.c
index 23865c905..cec2060f7 100644
--- a/src/backends/native/meta-seat-impl.c
+++ b/src/backends/native/meta-seat-impl.c
@@ -1169,9 +1169,12 @@ relative_motion_across_outputs (MetaViewportInfo   *viewports,
 
       meta_viewport_info_get_view_info (viewports, cur_view, &rect, &scale);
 
+      target_x = x + (dx * scale);
+      target_y = y + (dy * scale);
+
       motion = (MetaLine2) {
         .a = { x, y },
-        .b = { x + (dx * scale), y + (dy * scale) }
+        .b = { target_x, target_y }
       };
       left = (MetaLine2) {
         { rect.x, rect.y },
@@ -1190,9 +1193,6 @@ relative_motion_across_outputs (MetaViewportInfo   *viewports,
         { rect.x + rect.width, rect.y + rect.height }
       };
 
-      target_x = motion.b.x;
-      target_y = motion.b.y;
-
       if (direction != META_DISPLAY_RIGHT &&
           meta_line2_intersects_with (&motion, &left, &intersection))
         direction = META_DISPLAY_LEFT;
@@ -1209,10 +1209,10 @@ relative_motion_across_outputs (MetaViewportInfo   *viewports,
         /* We reached the dest logical monitor */
         break;
 
+      dx -= intersection.x - x;
+      dy -= intersection.y - y;
       x = intersection.x;
       y = intersection.y;
-      dx -= intersection.x - motion.a.x;
-      dy -= intersection.y - motion.a.y;
 
       cur_view = meta_viewport_info_get_neighbor (viewports, cur_view,
                                                   direction);