Add window divider faces to NS (bug#29353)

* src/nsterm.m (ns_draw_window_divider): Use
window-divider-first-pixel and window-divider-last-pixel faces.

1 files changed, 43 insertions, 7 deletions

diff --git a/src/nsterm.m b/src/nsterm.m
index 5c29f039e51..cf32a5e8015 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -3174,18 +3174,54 @@ ns_draw_window_divider (struct window *w, int x0, int x1, int y0, int y1)
    -------------------------------------------------------------------------- */
 {
   struct frame *f = XFRAME (WINDOW_FRAME (w));
-  struct face *face;
-  NSRect r = NSMakeRect (x0, y0, x1-x0, y1-y0);
+  struct face *face = FACE_FROM_ID_OR_NULL (f, WINDOW_DIVIDER_FACE_ID);
+  struct face *face_first
+    = FACE_FROM_ID_OR_NULL (f, WINDOW_DIVIDER_FIRST_PIXEL_FACE_ID);
+  struct face *face_last
+    = FACE_FROM_ID_OR_NULL (f, WINDOW_DIVIDER_LAST_PIXEL_FACE_ID);
+  unsigned long color = face ? face->foreground : FRAME_FOREGROUND_PIXEL (f);
+  unsigned long color_first = (face_first
+                               ? face_first->foreground
+                               : FRAME_FOREGROUND_PIXEL (f));
+  unsigned long color_last = (face_last
+                              ? face_last->foreground
+                              : FRAME_FOREGROUND_PIXEL (f));
+  NSRect divider = NSMakeRect (x0, y0, x1-x0, y1-y0);
 
   NSTRACE ("ns_draw_window_divider");
 
-  face = FACE_FROM_ID_OR_NULL (f, WINDOW_DIVIDER_FACE_ID);
+  ns_focus (f, &divider, 1);
 
-  ns_focus (f, &r, 1);
-  if (face)
-    [ns_lookup_indexed_color(face->foreground, f) set];
+  if ((y1 - y0 > x1 - x0) && (x1 - x0 >= 3))
+    /* A vertical divider, at least three pixels wide: Draw first and
+       last pixels differently.  */
+    {
+      [ns_lookup_indexed_color(color_first, f) set];
+      NSRectFill(NSMakeRect (x0, y0, 1, y1 - y0));
+      [ns_lookup_indexed_color(color, f) set];
+      NSRectFill(NSMakeRect (x0 + 1, y0, x1 - x0 - 2, y1 - y0));
+      [ns_lookup_indexed_color(color_last, f) set];
+      NSRectFill(NSMakeRect (x1 - 1, y0, 1, y1 - y0));
+    }
+  else if ((x1 - x0 > y1 - y0) && (y1 - y0 >= 3))
+    /* A horizontal divider, at least three pixels high: Draw first and
+       last pixels differently.  */
+    {
+      [ns_lookup_indexed_color(color_first, f) set];
+      NSRectFill(NSMakeRect (x0, y0, x1 - x0, 1));
+      [ns_lookup_indexed_color(color, f) set];
+      NSRectFill(NSMakeRect (x0, y0 + 1, x1 - x0, y1 - y0 - 2));
+      [ns_lookup_indexed_color(color_last, f) set];
+      NSRectFill(NSMakeRect (x0, y1 - 1, x1 - x0, 1));
+    }
+  else
+    {
+      /* In any other case do not draw the first and last pixels
+         differently.  */
+      [ns_lookup_indexed_color(color, f) set];
+      NSRectFill(divider);
+    }
 
-  NSRectFill(r);
   ns_unfocus (f);
 }