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Fix crash when struts change during grab operation

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Since meta_workspace_invalidate_work_area() frees the edges
workspace->screen_edges and workspace->monitor_edges, we must clean up
our cached edge resistance data when the invalidate_work_area() is
called on the active workspace, or when the workspace changes.

Make the computation of the edge resistance data lazy so that it
will be recomputed the next time we try to access it.
meta_display_compute_resistance_and_snapping_edges() is made
private to edge-resistance.c

Invaliding the data when active workspace changes also will improve
correctness for edge resistance when the current workspace changes
during a grab operation. (Even with this fix we still don't try to
handle window positions changing during a grab operation; that can't
cause a crash since, unlike screen and monitor edges, the window edges
are freshly allocated, it will just cause slight oddness in that
corner case.)

Root cause tracked down due to much effort by Jon Nettleton.
https://bugzilla.gnome.org/show_bug.cgi?id=608800
This commit is contained in:
Owen W. Taylor 2010-02-09 16:44:16 -05:00
parent e14132b826
commit 2a823ef3e4
4 changed files with 25 additions and 19 deletions
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3
src/core/display-private.h
View File

@ -390,8 +390,7 @@ void meta_display_grab_focus_window_button (MetaDisplay *display,
void meta_display_ungrab_focus_window_button (MetaDisplay *display,
MetaWindow *window);
/* Next two functions are defined in edge-resistance.c */
void meta_display_compute_resistance_and_snapping_edges (MetaDisplay *display);
/* Next function is defined in edge-resistance.c */
void meta_display_cleanup_edges (MetaDisplay *display);
/* make a request to ensure the event serial has changed */

12
src/core/display.c
View File

@ -3636,18 +3636,6 @@ meta_display_begin_grab_op (MetaDisplay *display,
g_assert (display->grab_window != NULL || display->grab_screen != NULL);
g_assert (display->grab_op != META_GRAB_OP_NONE);
/* If this is a move or resize, cache the window edges for
* resistance/snapping
*/
if (meta_grab_op_is_resizing (display->grab_op) ||
meta_grab_op_is_moving (display->grab_op))
{
meta_topic (META_DEBUG_WINDOW_OPS,
"Computing edges to resist-movement or snap-to for %s.\n",
window->desc);
meta_display_compute_resistance_and_snapping_edges (display);
}
/* Save the old stacking */
if (GRAB_OP_IS_WINDOW_SWITCH (display->grab_op))
{

18
src/core/edge-resistance.c
View File

@ -63,6 +63,8 @@ struct MetaEdgeResistanceData
ResistanceDataForAnEdge bottom_data;
};
static void compute_resistance_and_snapping_edges (MetaDisplay *display);
/* !WARNING!: this function can return invalid indices (namely, either -1 or
* edges->len); this is by design, but you need to remember this.
*/
@ -550,7 +552,9 @@ apply_edge_resistance_to_each_side (MetaDisplay *display,
gboolean modified;
int new_left, new_right, new_top, new_bottom;
g_assert (display->grab_edge_resistance_data != NULL);
if (display->grab_edge_resistance_data == NULL)
compute_resistance_and_snapping_edges (display);
edge_data = display->grab_edge_resistance_data;
if (auto_snap)
@ -671,7 +675,8 @@ meta_display_cleanup_edges (MetaDisplay *display)
MetaEdgeResistanceData *edge_data = display->grab_edge_resistance_data;
GHashTable *edges_to_be_freed;
g_assert (edge_data != NULL);
if (edge_data == NULL) /* Not currently cached */
return;
/* We first need to clean out any window edges */
edges_to_be_freed = g_hash_table_new_full (g_direct_hash, g_direct_equal,
@ -938,8 +943,8 @@ initialize_grab_edge_resistance_data (MetaDisplay *display)
edge_data->bottom_data.keyboard_buildup = 0;
}
void
meta_display_compute_resistance_and_snapping_edges (MetaDisplay *display)
static void
compute_resistance_and_snapping_edges (MetaDisplay *display)
{
GList *stacked_windows;
GList *cur_window_iter;
@ -952,6 +957,11 @@ meta_display_compute_resistance_and_snapping_edges (MetaDisplay *display)
*/
GSList *rem_windows, *rem_win_stacking;
g_assert (display->grab_window != NULL);
meta_topic (META_DEBUG_WINDOW_OPS,
"Computing edges to resist-movement or snap-to for %s.\n",
display->grab_window->desc);
/*
* 1st: Get the list of relevant windows, from bottom to top
*/

9
src/core/workspace.c
View File

@ -478,6 +478,10 @@ meta_workspace_activate_with_focus (MetaWorkspace *workspace,
if (workspace->screen->active_workspace == workspace)
return;
/* Free any cached pointers to the workspaces's edges from
* a current resize or move operation */
meta_display_cleanup_edges (workspace->screen->display);
/* Note that old can be NULL; e.g. when starting up */
old = workspace->screen->active_workspace;
@ -713,6 +717,11 @@ meta_workspace_invalidate_work_area (MetaWorkspace *workspace)
"Invalidating work area for workspace %d\n",
meta_workspace_index (workspace));
/* If we are in the middle of a resize or move operation, we
* might have cached pointers to the workspace's edges */
if (workspace == workspace->screen->active_workspace)
meta_display_cleanup_edges (workspace->screen->display);
g_free (workspace->work_area_monitor);
workspace->work_area_monitor = NULL;