PKGBUILDs/extra/mutter/pointer.patch

From 70f20c90bd627be842b40396cf0c898b357f2dd0 Mon Sep 17 00:00:00 2001
From: Rui Matos <tiagomatos@gmail.com>
Date: Mon, 7 Mar 2016 17:24:13 +0100
Subject: Handle meta_screen_get_monitor_for_point() returning NULL

On the X11 backend we don't track the pointer position in
priv->current_x/y which remain set to zero. That means we never set
the clutter stage cursor if point 0,0 isn't covered by any monitor
since we return early.

Commit 4bebc5e5fa8aade8a96c769bf2365abe0948f6ce introduced this to
avoid crashing on the prepare-at handlers when the cursor position
doesn't fall inside any monitor area but we can handle that higher up
in the stack. In that case, the sprite's scale doesn't matter since
the cursor won't be shown anyway so we can skip setting it.

https://bugzilla.gnome.org/show_bug.cgi?id=763159
---
 src/backends/meta-cursor-renderer.c | 15 ---------------
 src/core/screen.c                   |  3 ++-
 src/wayland/meta-wayland-pointer.c  |  5 +++--
 3 files changed, 5 insertions(+), 18 deletions(-)

diff --git a/src/backends/meta-cursor-renderer.c b/src/backends/meta-cursor-renderer.c
index a76241b..48cd239 100644
--- a/src/backends/meta-cursor-renderer.c
+++ b/src/backends/meta-cursor-renderer.c
@@ -27,8 +27,6 @@
 #include "meta-cursor-renderer.h"
 
 #include <meta/meta-backend.h>
-#include <backends/meta-backend-private.h>
-#include <backends/meta-monitor-manager-private.h>
 #include <meta/util.h>
 
 #include <cogl/cogl.h>
@@ -118,14 +116,6 @@ meta_cursor_renderer_calculate_rect (MetaCursorRenderer *renderer,
   };
 }
 
-static gboolean
-is_cursor_in_monitors_area (int x, int y)
-{
-  MetaMonitorManager *monitor_manager = meta_backend_get_monitor_manager (meta_get_backend ());
-  return meta_monitor_manager_get_monitor_at_point (monitor_manager,
-                                                    (gfloat) x, (gfloat) y) >= 0;
-}
-
 static void
 update_cursor (MetaCursorRenderer *renderer,
                MetaCursorSprite   *cursor_sprite)
@@ -134,11 +124,6 @@ update_cursor (MetaCursorRenderer *renderer,
   gboolean handled_by_backend;
   gboolean should_redraw = FALSE;
 
-  /* do not render cursor if it is not on any monitor. Such situation
-   * can occur e. g. after monitor hot-plug */
-  if (!is_cursor_in_monitors_area (priv->current_x, priv->current_y))
-    return;
-
   if (cursor_sprite)
     meta_cursor_sprite_prepare_at (cursor_sprite,
                                    priv->current_x,
diff --git a/src/core/screen.c b/src/core/screen.c
index 19f7db5..7e098d7 100644
--- a/src/core/screen.c
+++ b/src/core/screen.c
@@ -1267,7 +1267,8 @@ root_cursor_prepare_at (MetaCursorSprite *cursor_sprite,
   monitor = meta_screen_get_monitor_for_point (screen, x, y);
 
   /* Reload the cursor texture if the scale has changed. */
-  meta_cursor_sprite_set_theme_scale (cursor_sprite, monitor->scale);
+  if (monitor)
+    meta_cursor_sprite_set_theme_scale (cursor_sprite, monitor->scale);
 }
 
 static void
diff --git a/src/wayland/meta-wayland-pointer.c b/src/wayland/meta-wayland-pointer.c
index 894a64d..651e38b 100644
--- a/src/wayland/meta-wayland-pointer.c
+++ b/src/wayland/meta-wayland-pointer.c
@@ -823,8 +823,9 @@ cursor_sprite_prepare_at (MetaCursorSprite *cursor_sprite,
   if (!meta_xwayland_is_xwayland_surface (surface))
     {
       monitor = meta_screen_get_monitor_for_point (screen, x, y);
-      meta_cursor_sprite_set_texture_scale (cursor_sprite,
-                                            (float)monitor->scale / surface->scale);
+      if (monitor)
+        meta_cursor_sprite_set_texture_scale (cursor_sprite,
+                                              (float)monitor->scale / surface->scale);
     }
   meta_wayland_surface_update_outputs (surface);
 }
-- 
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