[mutter/wayland] cursor-tracker: Force the grab cursor on grab ops

[Jasper St. Pierre <jstpierre src gnome org>]

commit 4091f5493d275153a9f35b79e8b27c3c848c57d7
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Mon Nov 18 19:34:04 2013 -0500

    cursor-tracker: Force the grab cursor on grab ops
    
    This makes window moving have a 'window move' cursor, and similar.

 src/core/display.c                     |   43 ++++++++++++++-----------------
 src/core/meta-cursor-tracker-private.h |    2 +
 src/core/meta-cursor-tracker.c         |   29 ++++++++++++++++-----
 3 files changed, 43 insertions(+), 31 deletions(-)
---
diff --git a/src/core/display.c b/src/core/display.c
index b54fd9d..a763df7 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -53,6 +53,7 @@
 #include <X11/Xatom.h>
 #include "mutter-enum-types.h"
 #include "meta-idle-monitor-private.h"
+#include "meta-cursor-tracker-private.h"
 
 #ifdef HAVE_RANDR
 #include <X11/extensions/Xrandr.h>
@@ -3879,59 +3880,53 @@ meta_display_xwindow_is_a_no_focus_window (MetaDisplay *display,
   return is_a_no_focus_window;
 }
 
-static Cursor
-xcursor_for_op (MetaDisplay *display,
-                MetaGrabOp   op)
+static MetaCursor
+meta_cursor_for_grab_op (MetaGrabOp op)
 {
-  MetaCursor cursor = META_CURSOR_DEFAULT;
-  
   switch (op)
     {
     case META_GRAB_OP_RESIZING_SE:
     case META_GRAB_OP_KEYBOARD_RESIZING_SE:
-      cursor = META_CURSOR_SE_RESIZE;
+      return META_CURSOR_SE_RESIZE;
       break;
     case META_GRAB_OP_RESIZING_S:
     case META_GRAB_OP_KEYBOARD_RESIZING_S:
-      cursor = META_CURSOR_SOUTH_RESIZE;
+      return META_CURSOR_SOUTH_RESIZE;
       break;
     case META_GRAB_OP_RESIZING_SW:
     case META_GRAB_OP_KEYBOARD_RESIZING_SW:
-      cursor = META_CURSOR_SW_RESIZE;
+      return META_CURSOR_SW_RESIZE;
       break;
     case META_GRAB_OP_RESIZING_N:
     case META_GRAB_OP_KEYBOARD_RESIZING_N:
-      cursor = META_CURSOR_NORTH_RESIZE;
+      return META_CURSOR_NORTH_RESIZE;
       break;
     case META_GRAB_OP_RESIZING_NE:
     case META_GRAB_OP_KEYBOARD_RESIZING_NE:
-      cursor = META_CURSOR_NE_RESIZE;
+      return META_CURSOR_NE_RESIZE;
       break;
     case META_GRAB_OP_RESIZING_NW:
     case META_GRAB_OP_KEYBOARD_RESIZING_NW:
-      cursor = META_CURSOR_NW_RESIZE;
+      return META_CURSOR_NW_RESIZE;
       break;
     case META_GRAB_OP_RESIZING_W:
     case META_GRAB_OP_KEYBOARD_RESIZING_W:
-      cursor = META_CURSOR_WEST_RESIZE;
+      return META_CURSOR_WEST_RESIZE;
       break;
     case META_GRAB_OP_RESIZING_E:
     case META_GRAB_OP_KEYBOARD_RESIZING_E:
-      cursor = META_CURSOR_EAST_RESIZE;
+      return META_CURSOR_EAST_RESIZE;
       break;
     case META_GRAB_OP_MOVING:
     case META_GRAB_OP_KEYBOARD_MOVING:
     case META_GRAB_OP_KEYBOARD_RESIZING_UNKNOWN:
-      cursor = META_CURSOR_MOVE_OR_RESIZE_WINDOW;
+      return META_CURSOR_MOVE_OR_RESIZE_WINDOW;
       break;
-      
     default:
       break;
     }
 
-  if (cursor == META_CURSOR_DEFAULT)
-    return None;
-  return meta_display_create_x_cursor (display, cursor);
+  return META_CURSOR_DEFAULT;
 }
 
 void
@@ -3941,7 +3936,6 @@ meta_display_set_grab_op_cursor (MetaDisplay *display,
                                  Window       grab_xwindow,
                                  guint32      timestamp)
 {
-  Cursor cursor = xcursor_for_op (display, op);
   unsigned char mask_bits[XIMaskLen (XI_LASTEVENT)] = { 0 };
   XIEventMask mask = { XIAllMasterDevices, sizeof (mask_bits), mask_bits };
 
@@ -3958,7 +3952,7 @@ meta_display_set_grab_op_cursor (MetaDisplay *display,
                     META_VIRTUAL_CORE_POINTER_ID,
                     grab_xwindow,
                     timestamp,
-                    cursor,
+                    None,
                     XIGrabModeAsync, XIGrabModeAsync,
                     False, /* owner_events */
                     &mask) == Success)
@@ -3974,10 +3968,10 @@ meta_display_set_grab_op_cursor (MetaDisplay *display,
                   "XIGrabDevice() failed time %u\n",
                   timestamp);
     }
+
   meta_error_trap_pop (display);
-  
-  if (cursor != None)
-    XFreeCursor (display->xdisplay, cursor);
+
+  meta_cursor_tracker_set_grab_cursor (screen->cursor_tracker, meta_cursor_for_grab_op (op));
 }
 
 gboolean
@@ -4239,7 +4233,8 @@ meta_display_end_grab_op (MetaDisplay *display,
         meta_screen_ungrab_all_keys (display->grab_screen, timestamp);
     }
 
-  
+  meta_cursor_tracker_set_grab_cursor (display->grab_screen->cursor_tracker, META_CURSOR_DEFAULT);
+
   display->grab_timestamp = 0;
   display->grab_window = NULL;
   display->grab_screen = NULL;
diff --git a/src/core/meta-cursor-tracker-private.h b/src/core/meta-cursor-tracker-private.h
index ffa08df..b0ad11e 100644
--- a/src/core/meta-cursor-tracker-private.h
+++ b/src/core/meta-cursor-tracker-private.h
@@ -31,6 +31,8 @@
 gboolean meta_cursor_tracker_handle_xevent (MetaCursorTracker *tracker,
                                            XEvent            *xevent);
 
+void     meta_cursor_tracker_set_grab_cursor     (MetaCursorTracker  *tracker,
+                                                  MetaCursor          cursor);
 void     meta_cursor_tracker_set_window_cursor   (MetaCursorTracker  *tracker,
                                                   struct wl_resource *buffer,
                                                   int                 hot_x,
diff --git a/src/core/meta-cursor-tracker.c b/src/core/meta-cursor-tracker.c
index e4cf92f..bbdba90 100644
--- a/src/core/meta-cursor-tracker.c
+++ b/src/core/meta-cursor-tracker.c
@@ -70,19 +70,22 @@ struct _MetaCursorTracker {
   gboolean is_showing;
   gboolean has_hw_cursor;
 
-  /* The cursor tracker stores the cursor for the window with
-   * pointer focus, and the cursor for the root window, which
-   * contains either the default arrow cursor or the 'busy'
-   * hourglass if we're launching an app.
+  /* The cursor tracker stores the cursor for the current grab
+   * operation, the cursor for the window with pointer focus, and
+   * the cursor for the root window, which contains either the
+   * default arrow cursor or the 'busy' hourglass if we're launching
+   * an app.
    *
-   * We choose the first one available -- if there's a window
-   * cursor, we choose that, otherwise we choose the root
-   * cursor.
+   * We choose the first one available -- if there's a grab cursor,
+   * we choose that cursor, if there's window cursor, we choose that,
+   * otherwise we choose the root cursor.
    *
    * The displayed_cursor contains the chosen cursor.
    */
   MetaCursorReference *displayed_cursor;
 
+  MetaCursorReference *grab_cursor;
+
   /* Wayland clients can set a NULL buffer as their cursor 
    * explicitly, which means that we shouldn't display anything.
    * So, we can't simply store a NULL in window_cursor to
@@ -830,6 +833,15 @@ ensure_wayland_cursor (MetaCursorTracker *tracker,
 }
 
 void
+meta_cursor_tracker_set_grab_cursor (MetaCursorTracker *tracker,
+                                     MetaCursor         cursor)
+{
+  g_clear_pointer (&tracker->grab_cursor, meta_cursor_reference_unref);
+  if (cursor != META_CURSOR_DEFAULT)
+    tracker->grab_cursor = ensure_wayland_cursor (tracker, cursor);
+}
+
+void
 meta_cursor_tracker_set_window_cursor (MetaCursorTracker  *tracker,
                                        struct wl_resource *buffer,
                                        int                 hot_x,
@@ -937,6 +949,9 @@ get_displayed_cursor (MetaCursorTracker *tracker)
   if (!tracker->is_showing)
     return NULL;
 
+  if (tracker->grab_cursor)
+    return tracker->grab_cursor;
+
   if (tracker->has_window_cursor)
     return tracker->window_cursor;