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Use "later functions" to fix priority problems with Clutter redraw

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There was a problem where if, for example, a restack was triggered
out of a clutter event handler, then after Clutter processed the
events, it would proceed immmediately on to repaint the stage without
ever returning control to the GLib main loop. So even though we
had an idle handler installed with a higher priority than the
Clutter stage repainting the clutter stage repainting would happen
first and we'd get a wrong frame.

Fix this by introducing the idea of "later functions", which abstract
the idea of "doing something later" away from g_idle_add() and use
a combination of GLib idle functions and Clutter "repaint functions"
to get our callbacks triggered at the right time, even when they
are installed from a clutter event handler.

https://bugzilla.gnome.org/show_bug.cgi?id=596334

This also resolve a FIXME where MUTTER_PRIORITY_BEFORE_REDRAW
could starve stage repainting.
This commit is contained in:
Owen W. Taylor 2009-09-25 15:47:22 -04:00
parent d04b15ee25
commit 3508c4aa87
7 changed files with 267 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/core/screen-private.h
View File

@ -117,7 +117,7 @@ struct _MetaScreen
Window wm_cm_selection_window;
guint work_area_idle;
guint work_area_later;
int rows_of_workspaces;
int columns_of_workspaces;

28
src/core/screen.c
View File

@ -686,7 +686,7 @@ meta_screen_new (MetaDisplay *display,
screen->wm_cm_selection_window = meta_create_offscreen_window (xdisplay,
xroot,
NoEventMask);
screen->work_area_idle = 0;
screen->work_area_later = 0;
screen->active_workspace = NULL;
screen->workspaces = NULL;
@ -873,8 +873,8 @@ meta_screen_free (MetaScreen *screen,
XDestroyWindow (screen->display->xdisplay,
screen->wm_sn_selection_window);
if (screen->work_area_idle != 0)
g_source_remove (screen->work_area_idle);
if (screen->work_area_later != 0)
g_source_remove (screen->work_area_later);
if (XGetGCValues (screen->display->xdisplay,
@ -2291,12 +2291,12 @@ set_work_area_hint (MetaScreen *screen)
}
static gboolean
set_work_area_idle_func (MetaScreen *screen)
set_work_area_later_func (MetaScreen *screen)
{
meta_topic (META_DEBUG_WORKAREA,
"Running work area idle function\n");
"Running work area hint computation function\n");
screen->work_area_idle = 0;
screen->work_area_later = 0;
set_work_area_hint (screen);
@ -2306,16 +2306,16 @@ set_work_area_idle_func (MetaScreen *screen)
void
meta_screen_queue_workarea_recalc (MetaScreen *screen)
{
/* Recompute work area in an idle */
if (screen->work_area_idle == 0)
/* Recompute work area later before redrawing */
if (screen->work_area_later == 0)
{
meta_topic (META_DEBUG_WORKAREA,
"Adding work area hint idle function\n");
screen->work_area_idle =
g_idle_add_full (META_PRIORITY_BEFORE_REDRAW,
(GSourceFunc) set_work_area_idle_func,
screen,
NULL);
"Adding work area hint computation function\n");
screen->work_area_later =
meta_later_add (META_LATER_BEFORE_REDRAW,
(GSourceFunc) set_work_area_later_func,
screen,
NULL);
}
}

20
src/core/stack-tracker.c
View File

@ -134,7 +134,7 @@ struct _MetaStackTracker
/* Idle function used to sync the compositor's view of the window
* stack up with our best guess before a frame is drawn.
*/
guint sync_stack_idle;
guint sync_stack_later;
};
static void
@ -383,8 +383,8 @@ meta_stack_tracker_new (MetaScreen *screen)
void
meta_stack_tracker_free (MetaStackTracker *tracker)
{
if (tracker->sync_stack_idle)
g_source_remove (tracker->sync_stack_idle);
if (tracker->sync_stack_later)
meta_later_remove (tracker->sync_stack_later);
g_array_free (tracker->server_stack, TRUE);
if (tracker->predicted_stack)
@ -667,10 +667,10 @@ meta_stack_tracker_sync_stack (MetaStackTracker *tracker)
int n_windows;
int i;
if (tracker->sync_stack_idle)
if (tracker->sync_stack_later)
{
g_source_remove (tracker->sync_stack_idle);
tracker->sync_stack_idle = 0;
meta_later_remove (tracker->sync_stack_later);
tracker->sync_stack_later = 0;
}
meta_stack_tracker_get_stack (tracker, &windows, &n_windows);
@ -696,7 +696,7 @@ meta_stack_tracker_sync_stack (MetaStackTracker *tracker)
}
static gboolean
stack_tracker_sync_stack_idle (gpointer data)
stack_tracker_sync_stack_later (gpointer data)
{
meta_stack_tracker_sync_stack (data);
@ -719,10 +719,10 @@ stack_tracker_sync_stack_idle (gpointer data)
void
meta_stack_tracker_queue_sync_stack (MetaStackTracker *tracker)
{
if (tracker->sync_stack_idle == 0)
if (tracker->sync_stack_later == 0)
{
tracker->sync_stack_idle = g_idle_add_full (META_PRIORITY_BEFORE_REDRAW,
stack_tracker_sync_stack_idle,
tracker->sync_stack_later = meta_later_add (META_LATER_BEFORE_REDRAW,
stack_tracker_sync_stack_later,
tracker, NULL);
}
}

199
src/core/util.c
View File

@ -26,9 +26,12 @@
#define _POSIX_C_SOURCE 200112L /* for fdopen() */
#include <config.h>
#include "common.h"
#include "util.h"
#include "main.h"
#include <clutter/clutter.h> /* For clutter_threads_add_repaint_func() */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
@ -663,5 +666,201 @@ meta_nexus_get_type (void)
return nexus_type;
}
/***************************************************************************
* Later functions: like idles but integrated with the Clutter repaint loop
***************************************************************************/
static guint last_later_id = 0;
typedef struct
{
guint id;
MetaLaterType when;
GSourceFunc func;
gpointer data;
GDestroyNotify notify;
int source;
gboolean run_once;
} MetaLater;
static GSList *laters = NULL;
/* This is a dummy timeline used to get the Clutter master clock running */
static ClutterTimeline *later_timeline;
static guint later_repaint_func = 0;
static void ensure_later_repaint_func (void);
static void
destroy_later (MetaLater *later)
{
if (later->source)
g_source_remove (later->source);
if (later->notify)
later->notify (later->data);
g_slice_free (MetaLater, later);
}
/* Used to sort the list of laters with the highest priority
* functions first.
*/
static int
compare_laters (gconstpointer a,
gconstpointer b)
{
return ((const MetaLater *)a)->when - ((const MetaLater *)b)->when;
}
static gboolean
run_repaint_laters (gpointer data)
{
GSList *old_laters = laters;
GSList *l;
gboolean keep_timeline_running = FALSE;
laters = NULL;
for (l = old_laters; l; l = l->next)
{
MetaLater *later = l->data;
if (later->source == 0 ||
(later->when <= META_LATER_BEFORE_REDRAW && !later->run_once))
{
if (later->func (later->data))
{
if (later->source == 0)
keep_timeline_running = TRUE;
laters = g_slist_insert_sorted (laters, later, compare_laters);
}
else
destroy_later (later);
}
else
laters = g_slist_insert_sorted (laters, later, compare_laters);
}
if (!keep_timeline_running)
clutter_timeline_stop (later_timeline);
g_slist_free (old_laters);
/* Just keep the repaint func around - it's cheap if the list is empty */
return TRUE;
}
static void
ensure_later_repaint_func (void)
{
if (!later_timeline)
later_timeline = clutter_timeline_new (0);
if (later_repaint_func == 0)
later_repaint_func = clutter_threads_add_repaint_func (run_repaint_laters,
NULL, NULL);
/* Make sure the repaint function gets run */
clutter_timeline_start (later_timeline);
}
static gboolean
call_idle_later (gpointer data)
{
MetaLater *later = data;
if (!later->func (later->data))
{
laters = g_slist_remove (laters, later);
later->source = 0;
destroy_later (later);
return FALSE;
}
else
{
later->run_once = TRUE;
return TRUE;
}
}
/**
* meta_later_add:
* @when: enumeration value determining the phase at which to run the callback
* @func: callback to run later
* @data: data to pass to the callback
* @notify: function to call to destroy @data when it is no longer in use, or %NULL
*
* Sets up a callback to be called at some later time. @when determines the
* particular later occasion at which it is called. This is much like g_idle_add(),
* except that the functions interact properly with clutter event handling.
* If a "later" function is added from a clutter event handler, and is supposed
* to be run before the stage is redrawn, it will be run before that redraw
* of the stage, not the next one.
*
* Return value: an integer ID (guaranteed to be non-zero) that can be used
* to cancel the callback and prevent it from being run.
*/
guint
meta_later_add (MetaLaterType when,
GSourceFunc func,
gpointer data,
GDestroyNotify notify)
{
MetaLater *later = g_slice_new0 (MetaLater);
later->id = ++last_later_id;
later->when = when;
later->func = func;
later->data = data;
later->notify = notify;
laters = g_slist_insert_sorted (laters, later, compare_laters);
switch (when)
{
case META_LATER_RESIZE:
/* We add this one two ways - as a high-priority idle and as a
* repaint func. If we are in a clutter event callback, the repaint
* handler will get hit first, and we'll take care of this function
* there so it gets called before the stage is redrawn, even if
* we haven't gotten back to the main loop. Otherwise, the idle
* handler will get hit first and we want to call this function
* there so it will happen before GTK+ repaints.
*/
later->source = g_idle_add_full (META_PRIORITY_RESIZE, call_idle_later, later, NULL);
ensure_later_repaint_func ();
break;
case META_LATER_BEFORE_REDRAW:
ensure_later_repaint_func ();
break;
case META_LATER_IDLE:
later->source = g_idle_add_full (G_PRIORITY_DEFAULT_IDLE, call_idle_later, later, NULL);
break;
}
return later->id;
}
/**
* meta_later_remove:
* @later_id: the integer ID returned from meta_later_add()
*
* Removes a callback added with meta_later_add()
*/
void
meta_later_remove (guint later_id)
{
GSList *l;
for (l = laters; l; l = l->next)
{
MetaLater *later = l->data;
if (later->id == later_id)
{
laters = g_slist_remove_link (laters, l);
/* If this was a "repaint func" later, we just let the
* repaint func run and get removed
*/
destroy_later (later);
}
}
}
/* eof util.c */

37
src/core/window.c
View File

@ -116,8 +116,9 @@ static void meta_window_apply_session_info (MetaWindow *window,
static void unmaximize_window_before_freeing (MetaWindow *window);
static void unminimize_window_and_all_transient_parents (MetaWindow *window);
/* Idle handlers for the three queues. The "data" parameter in each case
* will be a GINT_TO_POINTER of the index into the queue arrays to use.
/* Idle handlers for the three queues (run with meta_later_add()). The
* "data" parameter in each case will be a GINT_TO_POINTER of the
* index into the queue arrays to use.
*
* TODO: Possibly there is still some code duplication among these, which we
* need to sort out at some point.
@ -1705,7 +1706,7 @@ meta_window_calc_showing (MetaWindow *window)
implement_showing (window, meta_window_should_be_showing (window));
}
static guint queue_idle[NUMBER_OF_QUEUES] = {0, 0, 0};
static guint queue_later[NUMBER_OF_QUEUES] = {0, 0, 0};
static GSList *queue_pending[NUMBER_OF_QUEUES] = {NULL, NULL, NULL};
static int
@ -1743,7 +1744,7 @@ idle_calc_showing (gpointer data)
copy = g_slist_copy (queue_pending[queue_index]);
g_slist_free (queue_pending[queue_index]);
queue_pending[queue_index] = NULL;
queue_idle[queue_index] = 0;
queue_later[queue_index] = 0;
destroying_windows_disallowed += 1;
@ -1901,10 +1902,10 @@ meta_window_unqueue (MetaWindow *window, guint queuebits)
* In that case, we should kill the function that deals with
* the queue, because there's nothing left for it to do.
*/
if (queue_pending[queuenum] == NULL && queue_idle[queuenum] != 0)
if (queue_pending[queuenum] == NULL && queue_later[queuenum] != 0)
{
g_source_remove (queue_idle[queuenum]);
queue_idle[queuenum] = 0;
meta_later_remove (queue_later[queuenum]);
queue_later[queuenum] = 0;
}
}
}
@ -1937,14 +1938,14 @@ meta_window_queue (MetaWindow *window, guint queuebits)
* I seem to be turning into a Perl programmer.
*/
const gint window_queue_idle_priority[NUMBER_OF_QUEUES] =
const MetaLaterType window_queue_later_when[NUMBER_OF_QUEUES] =
{
META_PRIORITY_BEFORE_REDRAW, /* CALC_SHOWING */
META_PRIORITY_RESIZE, /* MOVE_RESIZE */
META_PRIORITY_BEFORE_REDRAW /* UPDATE_ICON */
META_LATER_BEFORE_REDRAW, /* CALC_SHOWING */
META_LATER_RESIZE, /* MOVE_RESIZE */
META_LATER_BEFORE_REDRAW /* UPDATE_ICON */
};
const GSourceFunc window_queue_idle_handler[NUMBER_OF_QUEUES] =
const GSourceFunc window_queue_later_handler[NUMBER_OF_QUEUES] =
{
idle_calc_showing,
idle_move_resize,
@ -1977,11 +1978,11 @@ meta_window_queue (MetaWindow *window, guint queuebits)
* that. If not, we'll create one.
*/
if (queue_idle[queuenum] == 0)
queue_idle[queuenum] = g_idle_add_full
if (queue_later[queuenum] == 0)
queue_later[queuenum] = meta_later_add
(
window_queue_idle_priority[queuenum],
window_queue_idle_handler[queuenum],
window_queue_later_when[queuenum],
window_queue_later_handler[queuenum],
GUINT_TO_POINTER(queuenum),
NULL
);
@ -4200,7 +4201,7 @@ idle_move_resize (gpointer data)
copy = g_slist_copy (queue_pending[queue_index]);
g_slist_free (queue_pending[queue_index]);
queue_pending[queue_index] = NULL;
queue_idle[queue_index] = 0;
queue_later[queue_index] = 0;
destroying_windows_disallowed += 1;
@ -6262,7 +6263,7 @@ idle_update_icon (gpointer data)
copy = g_slist_copy (queue_pending[queue_index]);
g_slist_free (queue_pending[queue_index]);
queue_pending[queue_index] = NULL;
queue_idle[queue_index] = 0;
queue_later[queue_index] = 0;
destroying_windows_disallowed += 1;

6
src/include/common.h
View File

@ -317,8 +317,10 @@ struct _MetaButtonLayout
* coelesce multiple things together, the appropriate place to
* do it is usually META_PRIORITY_BEFORE_REDRAW.
*
* (FIXME: Use a Clutter paint() function instead, to prevent
* starving the repaints)
* Note that its usually better to use meta_later_add() rather
* than calling g_idle_add() directly; this will make sure things
* get run when added from a clutter event handler without
* waiting for another repaint cycle.
*
* If something has a priority lower than the redraw priority
* (such as a default priority idle), then it may be arbitrarily

20
src/include/util.h
View File

@ -161,6 +161,26 @@ MetaNexus *meta_nexus_new ();
*/
extern MetaNexus *sigchld_nexus;
/**
* MetaLaterType:
* @META_LATER_RESIZE: call in a resize processing phase that is done
* before GTK+ repainting (including window borders) is done.
* @META_LATER_BEFORE_REDRAW: call before the stage is redrawn
* @META_LATER_IDLE: call at a very low priority (can be blocked
* by running animations or redrawing applications)
**/
typedef enum {
META_LATER_RESIZE,
META_LATER_BEFORE_REDRAW,
META_LATER_IDLE
} MetaLaterType;
guint meta_later_add (MetaLaterType when,
GSourceFunc func,
gpointer data,
GDestroyNotify notify);
void meta_later_remove (guint later_id);
#endif /* META_UTIL_H */