Refactor update_window_begin and update_window_end hooks

Bug#35464.

* src/dispnew.c (gui_update_window_begin, gui_update_window_end): New
procedures implementing common functionality.

* src/nsterm.m: (ns_update_window_begin, ns_update_window_end):
* src/xterm.c: (x_update_window_begin, x_update_window_end): Remove in
favor of only using the new generic versions.

* src/w32term.c: (w32_update_window_begin, w32_update_window_end):
Remove duplicated and unused code.

6 files changed, 118 insertions, 243 deletions

diff --git a/src/dispextern.h b/src/dispextern.h
index 4d6d0371d38..bb981f83fca 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -3521,6 +3521,10 @@ void clear_glyph_matrix_rows (struct glyph_matrix *, int, int);
 void clear_glyph_row (struct glyph_row *);
 void prepare_desired_row (struct window *, struct glyph_row *, bool);
 void update_single_window (struct window *);
+#ifdef HAVE_WINDOW_SYSTEM
+extern void gui_update_window_begin (struct window *);
+extern void gui_update_window_end (struct window *, bool, bool);
+#endif
 void do_pending_window_change (bool);
 void change_frame_size (struct frame *, int, int, bool, bool, bool, bool);
 void init_display (void);
diff --git a/src/dispnew.c b/src/dispnew.c
index 25a2d1cd38b..52a7b6d6ee0 100644
--- a/src/dispnew.c
+++ b/src/dispnew.c
@@ -3390,7 +3390,9 @@ update_window (struct window *w, bool force_p)
   struct glyph_matrix *desired_matrix = w->desired_matrix;
   bool paused_p;
   int preempt_count = clip_to_bounds (1, baud_rate / 2400 + 1, INT_MAX);
+#ifdef HAVE_WINDOW_SYSTEM
   struct redisplay_interface *rif = FRAME_RIF (XFRAME (WINDOW_FRAME (w)));
+#endif
 #ifdef GLYPH_DEBUG
   /* Check that W's frame doesn't have glyph matrices.  */
   eassert (FRAME_WINDOW_P (XFRAME (WINDOW_FRAME (w))));
@@ -3411,7 +3413,9 @@ update_window (struct window *w, bool force_p)
       bool changed_p = 0, mouse_face_overwritten_p = 0;
       int n_updated = 0;
 
-      rif->update_window_begin_hook (w);
+#ifdef HAVE_WINDOW_SYSTEM
+      gui_update_window_begin (w);
+#endif
       yb = window_text_bottom_y (w);
       row = MATRIX_ROW (desired_matrix, 0);
       end = MATRIX_MODE_LINE_ROW (desired_matrix);
@@ -3533,13 +3537,13 @@ update_window (struct window *w, bool force_p)
 
 #ifdef HAVE_WINDOW_SYSTEM
       update_window_fringes (w, 0);
-#endif
 
       /* End the update of window W.  Don't set the cursor if we
          paused updating the display because in this case,
          set_window_cursor_after_update hasn't been called, and
          W->output_cursor doesn't contain the cursor location.  */
-      rif->update_window_end_hook (w, !paused_p, mouse_face_overwritten_p);
+      gui_update_window_end (w, !paused_p, mouse_face_overwritten_p);
+#endif
     }
   else
     paused_p = 1;
@@ -3555,6 +3559,90 @@ update_window (struct window *w, bool force_p)
   return paused_p;
 }
 
+#ifdef HAVE_WINDOW_SYSTEM
+
+/* Start update of window W.  */
+
+void
+gui_update_window_begin (struct window *w)
+{
+  struct frame *f = XFRAME (WINDOW_FRAME (w));
+  Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (f);
+
+  block_input ();
+
+  if (FRAME_RIF (f)->update_window_begin_hook)
+    FRAME_RIF (f)->update_window_begin_hook (w);
+
+  w->output_cursor = w->cursor;
+
+  if (f == hlinfo->mouse_face_mouse_frame)
+    {
+      /* Don't do highlighting for mouse motion during the update.  */
+      hlinfo->mouse_face_defer = true;
+
+      /* If the frame needs to be redrawn, simply forget about any
+         prior mouse highlighting.  */
+      if (FRAME_GARBAGED_P (f))
+        hlinfo->mouse_face_window = Qnil;
+    }
+
+  unblock_input ();
+}
+
+/* End update of window W.
+
+   Draw vertical borders between horizontally adjacent windows, and
+   display W's cursor if CURSOR_ON_P is non-zero.
+
+   MOUSE_FACE_OVERWRITTEN_P non-zero means that some row containing
+   glyphs in mouse-face were overwritten.  In that case we have to
+   make sure that the mouse-highlight is properly redrawn.  */
+void
+gui_update_window_end (struct window *w, bool cursor_on_p,
+                       bool mouse_face_overwritten_p)
+{
+  struct frame *f = XFRAME (WINDOW_FRAME (w));
+
+  block_input ();
+
+  /* Pseudo windows don't have cursors, so don't display them here.  */
+  if (!w->pseudo_window_p)
+    {
+
+      if (cursor_on_p)
+        display_and_set_cursor (w, true,
+                                w->output_cursor.hpos, w->output_cursor.vpos,
+                                w->output_cursor.x, w->output_cursor.y);
+
+      if (draw_window_fringes (w, true))
+        {
+          if (WINDOW_RIGHT_DIVIDER_WIDTH (w))
+            gui_draw_right_divider (w);
+          else
+            gui_draw_vertical_border (w);
+        }
+    }
+
+  /* If a row with mouse-face was overwritten, arrange for
+     frame_up_to_date_hook to redisplay the mouse highlight.  */
+  if (mouse_face_overwritten_p)
+    {
+      Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (f);
+
+      hlinfo->mouse_face_beg_row = hlinfo->mouse_face_beg_col = -1;
+      hlinfo->mouse_face_end_row = hlinfo->mouse_face_end_col = -1;
+      hlinfo->mouse_face_window = Qnil;
+    }
+
+  if (FRAME_RIF (f)->update_window_end_hook)
+    FRAME_RIF (f)->update_window_end_hook (w,
+                                           cursor_on_p,
+                                           mouse_face_overwritten_p);
+  unblock_input ();
+}
+
+#endif /* HAVE_WINDOW_SYSTEM  */
 
 /* Update the display of area AREA in window W, row number VPOS.
    AREA can be either LEFT_MARGIN_AREA or RIGHT_MARGIN_AREA.  */
diff --git a/src/nsterm.m b/src/nsterm.m
index cdf1916e71b..ffb7b7692b4 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -1106,7 +1106,7 @@ static void
 ns_update_begin (struct frame *f)
 /* --------------------------------------------------------------------------
    Prepare for a grouped sequence of drawing calls
-   external (RIF) call; whole frame, called before update_window_begin
+   external (RIF) call; whole frame, called before gui_update_window_begin
    -------------------------------------------------------------------------- */
 {
 #ifdef NS_IMPL_COCOA
@@ -1129,80 +1129,10 @@ ns_update_begin (struct frame *f)
 
 
 static void
-ns_update_window_begin (struct window *w)
-/* --------------------------------------------------------------------------
-   Prepare for a grouped sequence of drawing calls
-   external (RIF) call; for one window, called after update_begin
-   -------------------------------------------------------------------------- */
-{
-  struct frame *f = XFRAME (WINDOW_FRAME (w));
-  Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (f);
-
-  NSTRACE_WHEN (NSTRACE_GROUP_UPDATES, "ns_update_window_begin");
-  w->output_cursor = w->cursor;
-
-  block_input ();
-
-  if (f == hlinfo->mouse_face_mouse_frame)
-    {
-      /* Don't do highlighting for mouse motion during the update.  */
-      hlinfo->mouse_face_defer = 1;
-
-        /* If the frame needs to be redrawn,
-           simply forget about any prior mouse highlighting.  */
-      if (FRAME_GARBAGED_P (f))
-        hlinfo->mouse_face_window = Qnil;
-
-      /* (further code for mouse faces ifdef'd out in other terms elided) */
-    }
-
-  unblock_input ();
-}
-
-
-static void
-ns_update_window_end (struct window *w, bool cursor_on_p,
-                      bool mouse_face_overwritten_p)
-/* --------------------------------------------------------------------------
-   Finished a grouped sequence of drawing calls
-   external (RIF) call; for one window called before update_end
-   -------------------------------------------------------------------------- */
-{
-  NSTRACE_WHEN (NSTRACE_GROUP_UPDATES, "ns_update_window_end");
-
-  /* note: this fn is nearly identical in all terms */
-  if (!w->pseudo_window_p)
-    {
-      block_input ();
-
-      if (cursor_on_p)
-        display_and_set_cursor (w, 1,
-                                w->output_cursor.hpos, w->output_cursor.vpos,
-                                w->output_cursor.x, w->output_cursor.y);
-
-      if (draw_window_fringes (w, 1))
-        {
-          if (WINDOW_RIGHT_DIVIDER_WIDTH (w))
-            gui_draw_right_divider (w);
-          else
-            gui_draw_vertical_border (w);
-        }
-
-      unblock_input ();
-    }
-
-  /* If a row with mouse-face was overwritten, arrange for
-     frame_up_to_date to redisplay the mouse highlight.  */
-  if (mouse_face_overwritten_p)
-    reset_mouse_highlight (MOUSE_HL_INFO (XFRAME (w->frame)));
-}
-
-
-static void
 ns_update_end (struct frame *f)
 /* --------------------------------------------------------------------------
    Finished a grouped sequence of drawing calls
-   external (RIF) call; for whole frame, called after update_window_end
+   external (RIF) call; for whole frame, called after gui_update_window_end
    -------------------------------------------------------------------------- */
 {
   NSTRACE_WHEN (NSTRACE_GROUP_UPDATES, "ns_update_end");
@@ -5166,8 +5096,8 @@ static struct redisplay_interface ns_redisplay_interface =
   gui_clear_end_of_line,
   ns_scroll_run,
   ns_after_update_window_line,
-  ns_update_window_begin,
-  ns_update_window_end,
+  NULL, /* update_window_begin */
+  NULL, /* update_window_end   */
   0, /* flush_display */
   gui_clear_window_mouse_face,
   gui_get_glyph_overhangs,
diff --git a/src/w32term.c b/src/w32term.c
index 451dd54dd8a..0abec3d92a7 100644
--- a/src/w32term.c
+++ b/src/w32term.c
@@ -529,7 +529,7 @@ w32_display_pixel_width (struct w32_display_info *dpyinfo)
 
 /* Start an update of frame F.  This function is installed as a hook
    for update_begin, i.e. it is called when update_begin is called.
-   This function is called prior to calls to w32_update_window_begin
+   This function is called prior to calls to gui_update_window_begin
    for each window being updated.  */
 
 static void
@@ -555,58 +555,12 @@ w32_update_begin (struct frame *f)
 static void
 w32_update_window_begin (struct window *w)
 {
-  struct frame *f = XFRAME (WINDOW_FRAME (w));
-  Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (f);
-
   /* Hide the system caret during an update.  */
   if (w32_use_visible_system_caret && w32_system_caret_hwnd)
     {
       SendMessageTimeout (w32_system_caret_hwnd, WM_EMACS_HIDE_CARET, 0, 0,
                           0, 6000, NULL);
     }
-
-  w->output_cursor = w->cursor;
-
-  block_input ();
-
-  if (f == hlinfo->mouse_face_mouse_frame)
-    {
-      /* Don't do highlighting for mouse motion during the update.  */
-      hlinfo->mouse_face_defer = true;
-
-      /* If F needs to be redrawn, simply forget about any prior mouse
-         highlighting.  */
-      if (FRAME_GARBAGED_P (f))
-        hlinfo->mouse_face_window = Qnil;
-
-#if 0 /* Rows in a current matrix containing glyphs in mouse-face have
-         their mouse_face_p flag set, which means that they are always
-         unequal to rows in a desired matrix which never have that
-         flag set.  So, rows containing mouse-face glyphs are never
-         scrolled, and we don't have to switch the mouse highlight off
-         here to prevent it from being scrolled.  */
-
-      /* Can we tell that this update does not affect the window
-         where the mouse highlight is?  If so, no need to turn off.
-         Likewise, don't do anything if the frame is garbaged;
-         in that case, the frame's current matrix that we would use
-         is all wrong, and we will redisplay that line anyway.  */
-      if (!NILP (hlinfo->mouse_face_window)
-          && w == XWINDOW (hlinfo->mouse_face_window))
-        {
-          int i;
-
-          for (i = 0; i < w->desired_matrix->nrows; ++i)
-            if (MATRIX_ROW_ENABLED_P (w->desired_matrix, i))
-              break;
-
-          if (i < w->desired_matrix->nrows)
-            clear_mouse_face (hlinfo);
-        }
-#endif /* 0 */
-    }
-
-  unblock_input ();
 }
 
 /* Draw a vertical window border from (x,y0) to (x,y1)  */
@@ -694,39 +648,8 @@ w32_draw_window_divider (struct window *w, int x0, int x1, int y0, int y1)
 
 static void
 w32_update_window_end (struct window *w, bool cursor_on_p,
-                     bool mouse_face_overwritten_p)
+                       bool mouse_face_overwritten_p)
 {
-  if (!w->pseudo_window_p)
-    {
-      block_input ();
-
-      if (cursor_on_p)
-        display_and_set_cursor (w, true,
-                                w->output_cursor.hpos, w->output_cursor.vpos,
-                                w->output_cursor.x, w->output_cursor.y);
-
-      if (draw_window_fringes (w, true))
-        {
-          if (WINDOW_RIGHT_DIVIDER_WIDTH (w))
-            gui_draw_right_divider (w);
-          else
-            gui_draw_vertical_border (w);
-        }
-
-      unblock_input ();
-    }
-
-  /* If a row with mouse-face was overwritten, arrange for
-     XTframe_up_to_date to redisplay the mouse highlight.  */
-  if (mouse_face_overwritten_p)
-    {
-      Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (XFRAME (w->frame));
-
-      hlinfo->mouse_face_beg_row = hlinfo->mouse_face_beg_col = -1;
-      hlinfo->mouse_face_end_row = hlinfo->mouse_face_end_col = -1;
-      hlinfo->mouse_face_window = Qnil;
-    }
-
   /* Unhide the caret.  This won't actually show the cursor, unless it
      was visible before the corresponding call to HideCaret in
      w32_update_window_begin.  */
@@ -2859,7 +2782,7 @@ w32_scroll_run (struct window *w, struct run *run)
 
   block_input ();
 
-  /* Cursor off.  Will be switched on again in w32_update_window_end.  */
+  /* Cursor off.  Will be switched on again in gui_update_window_end.  */
   gui_clear_cursor (w);
 
   {
diff --git a/src/xdisp.c b/src/xdisp.c
index 95ff8513e30..3bdb8ea1b0f 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -18030,12 +18030,14 @@ try_window_reusing_current_matrix (struct window *w)
 
           if (run.height > 0 && run.current_y != run.desired_y)
             {
+#ifdef HAVE_WINDOW_SYSTEM
               update_begin (f);
-              FRAME_RIF (f)->update_window_begin_hook (w);
+              gui_update_window_begin (w);
               FRAME_RIF (f)->clear_window_mouse_face (w);
               FRAME_RIF (f)->scroll_run_hook (w, &run);
-              FRAME_RIF (f)->update_window_end_hook (w, false, false);
+              gui_update_window_end (w, false, false);
               update_end (f);
+#endif
             }
 
           /* Shift current matrix down by nrows_scrolled lines.  */
@@ -18194,12 +18196,14 @@ try_window_reusing_current_matrix (struct window *w)
 
       if (run.height)
         {
+#ifdef HAVE_WINDOW_SYSTEM
           update_begin (f);
-          FRAME_RIF (f)->update_window_begin_hook (w);
+          gui_update_window_begin (w);
           FRAME_RIF (f)->clear_window_mouse_face (w);
           FRAME_RIF (f)->scroll_run_hook (w, &run);
-          FRAME_RIF (f)->update_window_end_hook (w, false, false);
+          gui_update_window_end (w, false, false);
           update_end (f);
+#endif
         }
 
       /* Adjust Y positions of reused rows.  */
@@ -19147,10 +19151,12 @@ try_window_id (struct window *w)
 
       if (FRAME_WINDOW_P (f))
         {
-          FRAME_RIF (f)->update_window_begin_hook (w);
+#ifdef HAVE_WINDOW_SYSTEM
+          gui_update_window_begin (w);
           FRAME_RIF (f)->clear_window_mouse_face (w);
           FRAME_RIF (f)->scroll_run_hook (w, &run);
-          FRAME_RIF (f)->update_window_end_hook (w, false, false);
+          gui_update_window_end (w, false, false);
+#endif
         }
       else
         {
diff --git a/src/xterm.c b/src/xterm.c
index dd19b8bde15..26f74cde91d 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -989,7 +989,7 @@ x_set_frame_alpha (struct frame *f)
 
 /* Start an update of frame F.  This function is installed as a hook
    for update_begin, i.e. it is called when update_begin is called.
-   This function is called prior to calls to x_update_window_begin for
+   This function is called prior to calls to gui_update_window_begin for
    each window being updated.  Currently, there is nothing to do here
    because all interesting stuff is done on a window basis.  */
 
@@ -1033,33 +1033,6 @@ x_update_begin (struct frame *f)
 #endif /* USE_CAIRO */
 }
 
-/* Start update of window W.  */
-
-static void
-x_update_window_begin (struct window *w)
-{
-  struct frame *f = XFRAME (WINDOW_FRAME (w));
-  Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (f);
-
-  w->output_cursor = w->cursor;
-
-  block_input ();
-
-  if (f == hlinfo->mouse_face_mouse_frame)
-    {
-      /* Don't do highlighting for mouse motion during the update.  */
-      hlinfo->mouse_face_defer = true;
-
-      /* If F needs to be redrawn, simply forget about any prior mouse
-         highlighting.  */
-      if (FRAME_GARBAGED_P (f))
-        hlinfo->mouse_face_window = Qnil;
-    }
-
-  unblock_input ();
-}
-
-
 /* Draw a vertical window border from (x,y0) to (x,y1)  */
 
 static void
@@ -1139,55 +1112,6 @@ x_draw_window_divider (struct window *w, int x0, int x1, int y0, int y1)
     }
 }
 
-/* End update of window W.
-
-   Draw vertical borders between horizontally adjacent windows, and
-   display W's cursor if CURSOR_ON_P is non-zero.
-
-   MOUSE_FACE_OVERWRITTEN_P non-zero means that some row containing
-   glyphs in mouse-face were overwritten.  In that case we have to
-   make sure that the mouse-highlight is properly redrawn.
-
-   W may be a menu bar pseudo-window in case we don't have X toolkit
-   support.  Such windows don't have a cursor, so don't display it
-   here.  */
-
-static void
-x_update_window_end (struct window *w, bool cursor_on_p,
-                     bool mouse_face_overwritten_p)
-{
-  if (!w->pseudo_window_p)
-    {
-      block_input ();
-
-      if (cursor_on_p)
-        display_and_set_cursor (w, true,
-                                w->output_cursor.hpos, w->output_cursor.vpos,
-                                w->output_cursor.x, w->output_cursor.y);
-
-      if (draw_window_fringes (w, true))
-        {
-          if (WINDOW_RIGHT_DIVIDER_WIDTH (w))
-            gui_draw_right_divider (w);
-          else
-            gui_draw_vertical_border (w);
-        }
-
-      unblock_input ();
-    }
-
-  /* If a row with mouse-face was overwritten, arrange for
-     XTframe_up_to_date to redisplay the mouse highlight.  */
-  if (mouse_face_overwritten_p)
-    {
-      Mouse_HLInfo *hlinfo = MOUSE_HL_INFO (XFRAME (w->frame));
-
-      hlinfo->mouse_face_beg_row = hlinfo->mouse_face_beg_col = -1;
-      hlinfo->mouse_face_end_row = hlinfo->mouse_face_end_col = -1;
-      hlinfo->mouse_face_window = Qnil;
-    }
-}
-
 /* Show the frame back buffer.  If frame is double-buffered,
    atomically publish to the user's screen graphics updates made since
    the last call to show_back_buffer.  */
@@ -4306,7 +4230,7 @@ x_scroll_run (struct window *w, struct run *run)
 
   block_input ();
 
-  /* Cursor off.  Will be switched on again in x_update_window_end.  */
+  /* Cursor off.  Will be switched on again in gui_update_window_end.  */
   gui_clear_cursor (w);
 
 #ifdef USE_CAIRO
@@ -13145,8 +13069,8 @@ static struct redisplay_interface x_redisplay_interface =
     gui_clear_end_of_line,
     x_scroll_run,
     x_after_update_window_line,
-    x_update_window_begin,
-    x_update_window_end,
+    NULL, /* update_window_begin */
+    NULL, /* update_window_end   */
     x_flip_and_flush,
     gui_clear_window_mouse_face,
     gui_get_glyph_overhangs,