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Add a destroy notifier to the window.

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Thu May 25 15:11:58 2006  Søren Sandmann  <sandmann@redhat.com>

        * src/c-window.h: Add a destroy notifier to the window.

        * src/c-screen.c (on_window_destroy): New function.

        * src/c-screen.c (meta_comp_screen_add_window): Use the destroy
        notifier here.

        * src/c-window.c (generate_phases): New function. Simplify the
        minimize animation a lot by generating all the rectangle
        information into an array, then processing that.
This commit is contained in:
Søren Sandmann 2006-05-25 19:14:29 +00:00 committed by Søren Sandmann Pedersen
parent 76dff49a3e
commit cb84bc3e1d
5 changed files with 256 additions and 329 deletions
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13
ChangeLog
View File

@ -1,3 +1,16 @@
Thu May 25 15:11:58 2006 Søren Sandmann <sandmann@redhat.com>
* src/c-window.h: Add a destroy notifier to the window.
* src/c-screen.c (on_window_destroy): New function.
* src/c-screen.c (meta_comp_screen_add_window): Use the destroy
notifier here.
* src/c-window.c (generate_phases): New function. Simplify the
minimize animation a lot by generating all the rectangle
information into an array, then processing that.
2006-05-25 Adam Jackson <ajax@freedesktop.org>
* src/c-window.c:

36
src/c-screen.c
View File

@ -509,12 +509,30 @@ print_child_titles (WsWindow *window)
}
}
typedef struct
{
MetaCompScreen *cscreen;
XID xid;
} DestroyData;
static void
on_window_destroy (MetaCompWindow *comp_window,
gpointer closure)
{
DestroyData *data = closure;
CmNode *node = meta_comp_window_get_node (comp_window);
cm_stacker_remove_child (data->cscreen->stacker, node);
g_hash_table_remove (data->cscreen->windows_by_xid, (gpointer)data->xid);
}
void
meta_comp_screen_add_window (MetaCompScreen *info,
Window xwindow)
{
WsDrawable *drawable;
MetaCompWindow *comp_window;
DestroyData *data;
ws_display_begin_error_trap (info->display);
@ -536,8 +554,13 @@ meta_comp_screen_add_window (MetaCompScreen *info,
#endif
goto out;
}
data = g_new (DestroyData, 1);
data->cscreen = info;
data->xid = WS_RESOURCE_XID (drawable);
comp_window = meta_comp_window_new (info->meta_screen, drawable);
comp_window = meta_comp_window_new (info->meta_screen, drawable,
on_window_destroy, data);
g_hash_table_insert (info->windows_by_xid, (gpointer)WS_RESOURCE_XID (drawable), comp_window);
@ -569,16 +592,7 @@ meta_comp_screen_remove_window (MetaCompScreen *info,
MetaCompWindow *comp_window = meta_comp_window_lookup (info, xwindow);
if (comp_window)
{
if (meta_comp_window_free (comp_window))
{
CmNode *node = meta_comp_window_get_node (comp_window);
cm_stacker_remove_child (info->stacker, node);
g_hash_table_remove (info->windows_by_xid, (gpointer)xwindow);
}
}
meta_comp_window_free (comp_window);
}
void

527
src/c-window.c
View File

@ -48,15 +48,18 @@ struct _MetaCompWindow
WsRectangle size;
gboolean waiting_for_paint;
gint64 counter_value;
gint ref_count;
gboolean animation_in_progress;
gboolean hide_after_animation;
int stack_freeze_count;
int fade_in_idle_id;
MetaCompWindowDestroy destroy;
gpointer closure;
};
static void cancel_fade (MetaCompWindow *comp_window);
@ -198,7 +201,7 @@ meta_comp_window_hide (MetaCompWindow *comp_window)
comp_window->hide_after_animation = TRUE;
return;
}
cancel_fade (comp_window);
cm_drawable_node_set_viewable (CM_DRAWABLE_NODE (comp_window->node),
@ -207,7 +210,9 @@ meta_comp_window_hide (MetaCompWindow *comp_window)
MetaCompWindow *
meta_comp_window_new (MetaScreen *screen,
WsDrawable *drawable)
WsDrawable *drawable,
MetaCompWindowDestroy destroy,
gpointer closure)
{
MetaDisplay *display = screen->display;
MetaCompWindow *window;
@ -216,7 +221,7 @@ meta_comp_window_new (MetaScreen *screen,
ws_drawable_query_geometry (drawable, &geometry);
window = g_new0 (MetaCompWindow, 1);
window->screen = screen;
window->display = display;
window->drawable = g_object_ref (drawable);
@ -224,7 +229,9 @@ meta_comp_window_new (MetaScreen *screen,
window->updates = TRUE;
window->counter_value = 1;
window->ref_count = 1;
window->destroy = destroy;
window->closure = closure;
meta_comp_window_hide (window);
return window;
@ -243,15 +250,19 @@ comp_window_unref (MetaCompWindow *comp_window)
{
if (--comp_window->ref_count == 0)
{
if (comp_window->destroy)
comp_window->destroy (comp_window, comp_window->closure);
g_object_unref (comp_window->drawable);
g_object_unref (comp_window->node);
if (comp_window->alarm)
g_object_unref (comp_window->alarm);
memset (comp_window, 'e', sizeof (MetaCompWindow));
g_free (comp_window);
return TRUE;
}
return FALSE;
}
@ -333,9 +344,9 @@ send_configure_notify (WsDrawable *drawable)
{
WsWindow *window = WS_WINDOW (drawable);
WsRectangle geo;
ws_drawable_query_geometry (drawable, &geo);
#if 0
g_print ("sending configure notify %d %d %d %d\n",
geo.x, geo.y, geo.width, geo.height);
@ -350,19 +361,19 @@ static WsWindow *
find_client_window (MetaCompWindow *comp_window)
{
MetaWindow *meta_window = find_meta_window (comp_window);
if (meta_window && meta_window->frame)
{
WsDisplay *ws_display = WS_RESOURCE (comp_window->drawable)->display;
#if 0
g_print ("framed window (client: %lx)\n", WS_RESOURCE_XID (comp_window->drawable));
#endif
#if 0
g_print ("framed window (client: %lx\n", meta_window->xwindow);
#endif
#if 0
g_print ("framed window: %p\n", comp_window);
#endif
@ -388,7 +399,7 @@ private_metacity_window (MetaCompWindow *comp_window)
* such as a tooltip or a menu
*/
XID xid = WS_RESOURCE_XID (comp_window->drawable);
return meta_ui_window_is_widget (comp_window->screen->ui, xid);
}
@ -407,7 +418,7 @@ frameless_managed (MetaCompWindow *comp_window)
static gdouble
interpolate (gdouble t, gdouble begin, gdouble end, double power)
{
return (begin + (end - begin) * pow (t, power));
return (begin + (end - begin) * pow (t, power));
}
static void
@ -416,13 +427,13 @@ interpolate_rectangle (gdouble t,
WsRectangle * to,
WsRectangle * result)
{
if (!result)
return;
result->x = interpolate (t, from->x, to->x, 2);
result->y = interpolate (t, from->y, to->y, 0.5);
result->width = interpolate (t, from->width, to->width, 0.7);
result->height = interpolate (t, from->height, to->height, 0.7);
if (!result)
return;
result->x = interpolate (t, from->x, to->x, 2);
result->y = interpolate (t, from->y, to->y, 0.5);
result->width = interpolate (t, from->width, to->width, 0.7);
result->height = interpolate (t, from->height, to->height, 0.7);
}
static void
@ -475,7 +486,7 @@ update_fade (gpointer data)
{
gdouble alpha = interpolate (t, info->start_alpha, info->end_alpha, 1.0);
WsRectangle cur;
if (info->first_time)
{
meta_comp_window_show (info->window);
@ -504,16 +515,16 @@ meta_comp_window_fade_in (MetaCompWindow *comp_window)
{
FadeInfo *info = g_new0 (FadeInfo, 1);
WsWindow *window = find_client_window (comp_window);
if (comp_window->fade_in_idle_id)
return;
info->window = comp_window_ref (comp_window);
info->timer = g_timer_new ();
comp_window_get_real_size (info->window, &info->to);
info->from = info->to;
info->start_alpha = 0.1;
info->first_time = TRUE;
@ -542,9 +553,9 @@ on_request_alarm (WsSyncAlarm *alarm,
MetaCompWindow *comp_window)
{
/* This alarm means that the window is ready to be shown on screen */
meta_comp_window_fade_in (comp_window);
g_object_unref (alarm);
}
@ -564,7 +575,7 @@ send_sync_request (MetaCompWindow *comp_window)
request_counter = ws_window_get_property_sync_counter (
client_window, "_NET_WM_SYNC_REQUEST_COUNTER");
if (!request_counter)
return FALSE;
@ -576,17 +587,17 @@ send_sync_request (MetaCompWindow *comp_window)
msg[3] = (comp_window->counter_value >> 32) & 0xffffffff;
alarm = ws_sync_alarm_new (display, request_counter);
ws_sync_alarm_set (alarm, comp_window->counter_value);
g_signal_connect (alarm, "alarm_notify_event",
G_CALLBACK (on_request_alarm), comp_window);
ws_window_send_client_message (client_window,
"WM_PROTOCOLS", msg);
send_configure_notify (WS_DRAWABLE (client_window));
ws_display_flush (WS_RESOURCE (client_window)->display);
return TRUE;
@ -601,7 +612,7 @@ meta_comp_window_refresh_attrs (MetaCompWindow *comp_window)
double alpha = 1.0;
CmDrawableNode *node = CM_DRAWABLE_NODE (comp_window->node);
#if 0
g_print ("waiting for paint: %d\n", comp_window->waiting_for_paint);
#endif
@ -630,7 +641,7 @@ meta_comp_window_refresh_attrs (MetaCompWindow *comp_window)
}
cm_drawable_node_set_alpha (node, alpha);
if (!cm_drawable_node_get_viewable (node))
{
comp_window->waiting_for_paint = TRUE;
@ -641,7 +652,7 @@ meta_comp_window_refresh_attrs (MetaCompWindow *comp_window)
finish_counter = ws_window_get_property_sync_counter (
window, "_NET_WM_FINISH_FRAME_COUNTER");
#endif
/* For some reason the panel and nautilus don't respond to the
* sync counter stuff. FIXME: this should be figured out at
* some point.
@ -659,7 +670,7 @@ meta_comp_window_refresh_attrs (MetaCompWindow *comp_window)
#if 0
g_print ("unmapping %p\n", node);
#endif
meta_comp_window_hide (comp_window);
}
}
@ -671,7 +682,7 @@ meta_comp_window_set_updates (MetaCompWindow *comp_window,
CmDrawableNode *node = CM_DRAWABLE_NODE (comp_window->node);
comp_window->updates = updates;
cm_drawable_node_set_updates (node, updates);
if (updates)
@ -724,17 +735,17 @@ update_explosion (gpointer data)
ExplodeInfo *info = data;
CmDrawableNode *node = CM_DRAWABLE_NODE (info->comp_window->node);
gdouble elapsed = g_timer_elapsed (info->timer, NULL);
if (!cm_drawable_node_get_viewable (node) || elapsed > EXPLODE_TIME)
{
meta_effect_end (info->effect);
info->comp_window->animation_in_progress = FALSE;
if (info->comp_window->hide_after_animation)
meta_comp_window_hide (info->comp_window);
cm_drawable_node_set_explosion_level (node, 0.0);
comp_window_unref (info->comp_window);
return FALSE;
}
@ -753,7 +764,7 @@ meta_comp_window_explode (MetaCompWindow *comp_window,
MetaEffect *effect)
{
ExplodeInfo *info = g_new0 (ExplodeInfo, 1);
if (!cm_drawable_node_get_viewable (comp_window->node))
{
#if 0
@ -774,324 +785,208 @@ meta_comp_window_explode (MetaCompWindow *comp_window,
info->effect = effect;
info->level = 0.0;
info->timer = g_timer_new ();
g_idle_add (update_explosion, info);
}
/* new shrinkydink code */
/* shrinkydink minimize effect */
#define SHRINK_TIME 1.0
#define N_PHASES 5
typedef struct
{
MetaEffect *effect;
MetaCompWindow *window;
gdouble elapsed;
GTimer * timer;
} ShrinkInfo;
static gboolean
update_shrink (gpointer data)
{
ShrinkInfo *info = data;
CmDrawableNode *node = (CmDrawableNode *)info->window->node;
gdouble elapsed = g_timer_elapsed (info->timer, NULL);
if (elapsed > SHRINK_TIME)
{
meta_effect_end (info->effect);
cm_drawable_node_set_viewable (node, FALSE);
// cm_drawable_node_set_explosion_level (node, 0.0);
return FALSE;
}
else
{
gdouble t = elapsed / SHRINK_TIME;
// cm_drawable_node_set_explosion_level (node, transform (t));
return TRUE;
}
}
/* old shrinkydink minimize effect */
WsRectangle start_rect;
WsRectangle end_rect;
gdouble start_alpha;
gdouble end_alpha;
gdouble start_time;
gdouble end_time;
} Phase;
typedef struct
{
#if 0
MetaWindow *window;
#endif
GTimer *timer;
#if 0
MetaCompositor *compositor;
#endif
#if 0
MetaCompScreen *scr_info;
#endif
GTimer *timer;
MetaCompWindow *comp_window;
#if 0
MetaAnimationFinishedFunc finished_func;
gpointer finished_data;
#endif
MetaEffect *effect;
gdouble aspect_ratio;
WsRectangle current_geometry;
WsRectangle target_geometry;
gdouble current_alpha;
gdouble target_alpha;
int button_x;
int button_y;
int button_width;
int button_height;
/* FIXME: maybe would be simpler if all of this was an array */
gboolean phase_1_started;
gboolean phase_2_started;
gboolean phase_3_started;
gboolean phase_4_started;
gboolean phase_5_started;
gdouble aspect_ratio;
Phase phases[N_PHASES];
} MiniInfo;
static void
set_geometry (MiniInfo *info, gdouble elapsed)
set_geometry (MetaCompWindow *window,
Phase *phase,
gdouble elapsed)
{
WsRectangle rect;
interpolate_rectangle (elapsed, &info->current_geometry, &info->target_geometry, &rect);
#if 0
g_print ("y: %d %d (%f => %d)\n", info->current_geometry.y, info->target_geometry.y,
elapsed, rect.y);
g_print ("setting: %d %d %d %d\n", rect.x, rect.y, rect.width, rect.height);
#endif
comp_window_set_target_rect (info->comp_window, &rect);
WsRectangle rect;
gdouble alpha;
gdouble t = (elapsed - phase->start_time) / (phase->end_time - phase->start_time);
interpolate_rectangle (t, &phase->start_rect, &phase->end_rect, &rect);
alpha = interpolate (t, phase->start_alpha, phase->end_alpha, 1.0);
comp_window_set_target_rect (window, &rect);
cm_drawable_node_set_alpha (window->node, alpha);
}
static int
center (gdouble what, gdouble in)
{
return (in - what) / 2.0 + 0.5;
return (in - what) / 2.0 + 0.5;
}
static void
run_phase_1 (MiniInfo *info, gdouble elapsed)
{
if (!info->phase_1_started)
{
#if 0
g_print ("starting phase 1\n");
#endif
info->phase_1_started = TRUE;
comp_window_get_real_size (info->comp_window,
&info->current_geometry);
#if 0
info->current_geometry.x = info->node->real_x;
info->current_geometry.y = info->node->real_y;
info->current_geometry.width = info->node->real_width;
info->current_geometry.height = info->node->real_height;
#endif
info->target_geometry.height = info->button_height;
info->target_geometry.width = info->button_height * info->aspect_ratio;
info->target_geometry.x = info->button_x + center (info->target_geometry.width, info->button_width);
info->target_geometry.y = info->current_geometry.y + center (info->button_height, info->current_geometry.height);
}
set_geometry (info, elapsed);
}
#define WOBBLE_FACTOR 1.5
static void
run_phase_2 (MiniInfo *info, gdouble elapsed)
generate_phases (WsRectangle *start,
WsRectangle *icon,
Phase phases[N_PHASES])
{
#define WOBBLE_FACTOR 3
if (!info->phase_2_started)
const double phase_times[5] = {
0.225, /* scale to size of button */
0.100, /* scale up a little */
0.100, /* scale back a little */
0.100, /* drop down to icon */
0.350, /* fade out */
};
WsRectangle cur;
gdouble alpha;
gdouble aspect_ratio;
gdouble time;
int i;
aspect_ratio = (double)start->width / (double)start->height;
cur = *start;
time = 0.0;
alpha = 1.0;
for (i = 0; i < N_PHASES; ++i)
{
WsRectangle cur = info->target_geometry;
#if 0
g_print ("starting phase 2\n");
#endif
info->phase_2_started = TRUE;
info->current_geometry = cur;
info->target_geometry.x = cur.x + center (WOBBLE_FACTOR * cur.width, cur.width);
info->target_geometry.y = cur.y + center (WOBBLE_FACTOR * cur.height, cur.height);
info->target_geometry.width = cur.width * WOBBLE_FACTOR;
info->target_geometry.height = cur.height * WOBBLE_FACTOR;
Phase *phase = &(phases[i]);
WsRectangle *end = &(phase->end_rect);
phase->start_time = time;
phase->start_rect = cur;
phase->start_alpha = alpha;
phase->end_alpha = 1.0;
phase->end_time = time + phase_times[i];
if (i == 0)
{
/* Shrink to a little rectangle */
end->height = icon->height;
end->width = icon->height * aspect_ratio;
end->x = icon->x + center (end->width, icon->width);
end->y = cur.y + center (icon->height, cur.height);
}
else if (i == 1)
{
/* Zoom out a little */
end->x = cur.x + center (WOBBLE_FACTOR * cur.width, cur.width);
end->y = cur.y + center (WOBBLE_FACTOR * cur.height, cur.height);
end->width = cur.width * WOBBLE_FACTOR;
end->height = cur.height * WOBBLE_FACTOR;
}
else if (i == 2)
{
/* Zoom back */
end->height = icon->height;
end->width = icon->height * aspect_ratio;
end->x = icon->x + center (end->width, icon->width);
end->y = cur.y + center (icon->height, cur.height);
}
else if (i == 3)
{
/* Move down to the button */
end->height = icon->height;
end->width = icon->height * aspect_ratio;
end->x = icon->x + center (end->width, icon->width);
end->y = icon->y;
}
else if (i == 4)
{
/* Fade out */
end->x = icon->x;
end->y = icon->y;
end->width = icon->width;
end->height = icon->height;
phases[i].end_alpha = 0.0;
}
alpha = phase->end_alpha;
cur = phase->end_rect;
time += phase_times[i];
}
set_geometry (info, elapsed);
}
static void
run_phase_3 (MiniInfo *info, gdouble elapsed)
{
if (!info->phase_3_started)
{
WsRectangle cur = info->target_geometry;
WsRectangle real;
comp_window_get_real_size (info->comp_window, &real);
#if 0
g_print ("starting phase 3\n");
#endif
info->phase_3_started = TRUE;
info->current_geometry = cur;
info->target_geometry.height = info->button_height;
info->target_geometry.width = info->button_height * info->aspect_ratio;
info->target_geometry.x = info->button_x + center (info->target_geometry.width, info->button_width);
info->target_geometry.y = real.y + center (info->button_height, real.height);
}
set_geometry (info, elapsed);
}
static void
run_phase_4 (MiniInfo *info, gdouble elapsed)
{
if (!info->phase_4_started)
{
WsRectangle cur = info->target_geometry;
#if 0
g_print ("starting phase 4\n");
#endif
info->phase_4_started = TRUE;
info->current_geometry = cur;
info->target_geometry.height = info->button_height;
info->target_geometry.width = info->button_height * info->aspect_ratio;
info->target_geometry.x = cur.x;
#if 0
g_print ("button y: %d\n", info->button_y);
#endif
info->target_geometry.y = info->button_y;
}
set_geometry (info, elapsed);
}
static void
run_phase_5 (MiniInfo *info, gdouble elapsed)
{
if (!info->phase_5_started)
{
WsRectangle cur = info->target_geometry;
#if 0
g_print ("starting phase 5\n");
#endif
info->phase_5_started = TRUE;
info->current_geometry = cur;
info->target_geometry.x = info->button_x;
info->target_geometry.y = info->button_y;
info->target_geometry.width = info->button_width;
info->target_geometry.height = info->button_height;
}
set_geometry (info, elapsed);
cm_drawable_node_set_alpha (info->comp_window->node, 1 - elapsed);
}
static gboolean
run_animation_01 (gpointer data)
update_minimize (gpointer data)
{
MiniInfo *info = data;
gdouble elapsed;
elapsed = g_timer_elapsed (info->timer, NULL);
#define PHASE_0 0.0
#define PHASE_1 0.225 /* scale to size of button */
#define PHASE_2 0.325 /* scale up a little */
#define PHASE_3 0.425 /* scale back a little */
#define PHASE_4 0.650 /* move to button */
#define PHASE_5 1.0 /* fade out */
if (elapsed < PHASE_1)
MiniInfo *info = data;
Phase *current_phase;
int i;
gdouble elapsed = g_timer_elapsed (info->timer, NULL);
current_phase = NULL;
for (i = 0; i < N_PHASES; ++i)
{
/* phase one */
run_phase_1 (info, (elapsed - PHASE_0)/(PHASE_1 - PHASE_0));
Phase *p = &(info->phases[i]);
if (p->start_time < elapsed && p->end_time >= elapsed)
{
current_phase = p;
break;
}
}
else if (elapsed < PHASE_2)
if (current_phase)
{
/* phase two */
run_phase_2 (info, (elapsed - PHASE_1)/(PHASE_2 - PHASE_1));
set_geometry (info->comp_window, current_phase, elapsed);
return TRUE;
}
else if (elapsed < PHASE_3)
else
{
/* phase three */
run_phase_3 (info, (elapsed - PHASE_2)/(PHASE_3 - PHASE_2));
meta_comp_window_hide (info->comp_window);
cm_drawable_node_set_alpha (info->comp_window->node, 1.0);
cm_drawable_node_unset_patch (info->comp_window->node);
comp_window_unref (info->comp_window);
meta_effect_end (info->effect);
return FALSE;
}
else if (elapsed < PHASE_4)
{
/* phase four */
run_phase_4 (info, (elapsed - PHASE_3)/(PHASE_4 - PHASE_3));
}
else if (elapsed < PHASE_5)
{
/* phase five */
run_phase_5 (info, (elapsed - PHASE_4)/(PHASE_5 - PHASE_4));
}
else
{
meta_effect_end (info->effect);
return FALSE;
}
return TRUE;
}
void
meta_comp_window_run_minimize (MetaCompWindow *window,
MetaEffect *effect)
{
MiniInfo *info = g_new (MiniInfo, 1);
info->timer = g_timer_new ();
MiniInfo *info = g_new (MiniInfo, 1);
WsRectangle start, end;
info->comp_window = window;
info->effect = effect;
info->phase_1_started = FALSE;
info->phase_2_started = FALSE;
info->phase_3_started = FALSE;
info->phase_4_started = FALSE;
info->phase_5_started = FALSE;
info->button_x = effect->u.minimize.icon_rect.x;
info->button_y = effect->u.minimize.icon_rect.y;
info->button_width = effect->u.minimize.icon_rect.width;
info->button_height = effect->u.minimize.icon_rect.height;
info->timer = g_timer_new ();
info->comp_window = comp_window_ref (window);
#if 0
cm_drawable_node_set_deformation_func (node, minimize_deformation, info);
#endif
info->aspect_ratio = 1.3;
info->effect = effect;
g_idle_add (run_animation_01, info);
start.x = effect->u.minimize.window_rect.x;
start.y = effect->u.minimize.window_rect.y;
start.width = effect->u.minimize.window_rect.width;
start.height = effect->u.minimize.window_rect.height;
end.x = effect->u.minimize.icon_rect.x;
end.y = effect->u.minimize.icon_rect.y;
end.width = effect->u.minimize.icon_rect.width;
end.height = effect->u.minimize.icon_rect.height;
generate_phases (&start, &end, info->phases);
g_idle_add (update_minimize, info);
}
/* bounce effect */

7
src/c-window.h
View File

@ -26,8 +26,13 @@
typedef struct _MetaCompWindow MetaCompWindow;
typedef void (* MetaCompWindowDestroy) (MetaCompWindow *window,
gpointer closure);
MetaCompWindow *meta_comp_window_new (MetaScreen *screen,
WsDrawable *drawable);
WsDrawable *drawable,
MetaCompWindowDestroy destroy,
gpointer data);
CmNode *meta_comp_window_get_node (MetaCompWindow *window);
gboolean meta_comp_window_free (MetaCompWindow *window);
void meta_comp_window_set_size (MetaCompWindow *window,

2
src/compositor.c
View File

@ -629,7 +629,7 @@ meta_compositor_remove_window (MetaCompositor *compositor,
{
#ifdef HAVE_COMPOSITE_EXTENSIONS
MetaCompScreen *minfo;
minfo = meta_comp_screen_get_by_xwindow (xwindow);
if (minfo)