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mutter-performance-source/src/compositor/compositor.c
Jonas Ådahl 7193938d27 compositor: Guard against untimely calls 
It seems that sometimes these functions are called by Javascript in
GNOME Shell during tear down. This causes segfaults and crash reports,
but without any backtraces other than the entry and exit points into
gjs.

In order to get more useful information about where these calls come
from, validate the input passed gracefully, by complaining in the log
and returning NULL values.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/926
2019-11-11 13:09:20 +00:00

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/**
* SECTION:compositor
* @Title: MetaCompositor
* @Short_Description: Compositor API
*
* At a high-level, a window is not-visible or visible. When a
* window is added (with meta_compositor_add_window()) it is not visible.
* meta_compositor_show_window() indicates a transition from not-visible to
* visible. Some of the reasons for this:
*
* - Window newly created
* - Window is unminimized
* - Window is moved to the current desktop
* - Window was made sticky
*
* meta_compositor_hide_window() indicates that the window has transitioned from
* visible to not-visible. Some reasons include:
*
* - Window was destroyed
* - Window is minimized
* - Window is moved to a different desktop
* - Window no longer sticky.
*
* Note that combinations are possible - a window might have first
* been minimized and then moved to a different desktop. The 'effect' parameter
* to meta_compositor_show_window() and meta_compositor_hide_window() is a hint
* as to the appropriate effect to show the user and should not
* be considered to be indicative of a state change.
*
* When the active workspace is changed, meta_compositor_switch_workspace() is
* called first, then meta_compositor_show_window() and
* meta_compositor_hide_window() are called individually for each window
* affected, with an effect of META_COMP_EFFECT_NONE.
* If hiding windows will affect the switch workspace animation, the
* compositor needs to delay hiding the windows until the switch
* workspace animation completes.
*
* # Containers #
*
* There's two containers in the stage that are used to place window actors, here
* are listed in the order in which they are painted:
*
* - window group, accessible with meta_get_window_group_for_display()
* - top window group, accessible with meta_get_top_window_group_for_display()
*
* Mutter will place actors representing windows in the window group, except for
* override-redirect windows (ie. popups and menus) which will be placed in the
* top window group.
*/
#include "config.h"
#include "compositor/compositor-private.h"
#include <X11/extensions/Xcomposite.h>
#include "backends/meta-dnd-private.h"
#include "backends/x11/meta-backend-x11.h"
#include "backends/x11/meta-event-x11.h"
#include "backends/x11/meta-stage-x11.h"
#include "clutter/clutter-mutter.h"
#include "cogl/cogl-trace.h"
#include "compositor/meta-window-actor-x11.h"
#include "compositor/meta-window-actor-wayland.h"
#include "compositor/meta-window-actor-private.h"
#include "compositor/meta-window-group-private.h"
#include "core/display-private.h"
#include "core/frame.h"
#include "core/util-private.h"
#include "core/window-private.h"
#include "meta/compositor-mutter.h"
#include "meta/main.h"
#include "meta/meta-backend.h"
#include "meta/meta-background-actor.h"
#include "meta/meta-background-group.h"
#include "meta/meta-shadow-factory.h"
#include "meta/meta-x11-errors.h"
#include "meta/prefs.h"
#include "meta/window.h"
#include "x11/meta-x11-display-private.h"
#ifdef HAVE_WAYLAND
#include "wayland/meta-wayland-private.h"
#endif
enum
{
PROP_0,
PROP_DISPLAY,
N_PROPS
};
static GParamSpec *obj_props[N_PROPS] = { NULL, };
typedef struct _MetaCompositorPrivate
{
GObject parent;
MetaDisplay *display;
guint pre_paint_func_id;
guint post_paint_func_id;
gulong stage_presented_id;
gulong stage_after_paint_id;
int64_t server_time_query_time;
int64_t server_time_offset;
gboolean server_time_is_monotonic_time;
ClutterActor *stage;
ClutterActor *window_group;
ClutterActor *top_window_group;
ClutterActor *feedback_group;
GList *windows;
CoglContext *context;
MetaWindowActor *top_window_actor;
gulong top_window_actor_destroy_id;
int disable_unredirect_count;
int switch_workspace_in_progress;
MetaPluginManager *plugin_mgr;
} MetaCompositorPrivate;
G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (MetaCompositor, meta_compositor,
G_TYPE_OBJECT)
static void
on_presented (ClutterStage *stage,
CoglFrameEvent event,
ClutterFrameInfo *frame_info,
MetaCompositor *compositor);
static void
on_top_window_actor_destroyed (MetaWindowActor *window_actor,
MetaCompositor *compositor);
static gboolean
is_modal (MetaDisplay *display)
{
return display->event_route == META_EVENT_ROUTE_COMPOSITOR_GRAB;
}
static void sync_actor_stacking (MetaCompositor *compositor);
static void
meta_finish_workspace_switch (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
GList *l;
/* Finish hiding and showing actors for the new workspace */
for (l = priv->windows; l; l = l->next)
meta_window_actor_sync_visibility (l->data);
/* Fix up stacking order. */
sync_actor_stacking (compositor);
}
void
meta_switch_workspace_completed (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
/* FIXME -- must redo stacking order */
priv->switch_workspace_in_progress--;
if (priv->switch_workspace_in_progress < 0)
{
g_warning ("Error in workspace_switch accounting!");
priv->switch_workspace_in_progress = 0;
}
if (!priv->switch_workspace_in_progress)
meta_finish_workspace_switch (compositor);
}
void
meta_compositor_destroy (MetaCompositor *compositor)
{
g_object_run_dispose (G_OBJECT (compositor));
g_object_unref (compositor);
}
/* compat helper */
static MetaCompositor *
get_compositor_for_display (MetaDisplay *display)
{
return display->compositor;
}
/**
* meta_get_stage_for_display:
* @display: a #MetaDisplay
*
* Returns: (transfer none): The #ClutterStage for the display
*/
ClutterActor *
meta_get_stage_for_display (MetaDisplay *display)
{
MetaCompositor *compositor;
MetaCompositorPrivate *priv;
g_return_val_if_fail (display, NULL);
compositor = get_compositor_for_display (display);
g_return_val_if_fail (compositor, NULL);
priv = meta_compositor_get_instance_private (compositor);
return priv->stage;
}
/**
* meta_get_window_group_for_display:
* @display: a #MetaDisplay
*
* Returns: (transfer none): The window group corresponding to @display
*/
ClutterActor *
meta_get_window_group_for_display (MetaDisplay *display)
{
MetaCompositor *compositor;
MetaCompositorPrivate *priv;
g_return_val_if_fail (display, NULL);
compositor = get_compositor_for_display (display);
g_return_val_if_fail (compositor, NULL);
priv = meta_compositor_get_instance_private (compositor);
return priv->window_group;
}
/**
* meta_get_top_window_group_for_display:
* @display: a #MetaDisplay
*
* Returns: (transfer none): The top window group corresponding to @display
*/
ClutterActor *
meta_get_top_window_group_for_display (MetaDisplay *display)
{
MetaCompositor *compositor;
MetaCompositorPrivate *priv;
g_return_val_if_fail (display, NULL);
compositor = get_compositor_for_display (display);
g_return_val_if_fail (compositor, NULL);
priv = meta_compositor_get_instance_private (compositor);
return priv->top_window_group;
}
/**
* meta_get_feedback_group_for_display:
* @display: a #MetaDisplay
*
* Returns: (transfer none): The feedback group corresponding to @display
*/
ClutterActor *
meta_get_feedback_group_for_display (MetaDisplay *display)
{
MetaCompositor *compositor;
MetaCompositorPrivate *priv;
g_return_val_if_fail (display, NULL);
compositor = get_compositor_for_display (display);
g_return_val_if_fail (compositor, NULL);
priv = meta_compositor_get_instance_private (compositor);
return priv->feedback_group;
}
/**
* meta_get_window_actors:
* @display: a #MetaDisplay
*
* Returns: (transfer none) (element-type Clutter.Actor): The set of #MetaWindowActor on @display
*/
GList *
meta_get_window_actors (MetaDisplay *display)
{
MetaCompositor *compositor;
MetaCompositorPrivate *priv;
g_return_val_if_fail (display, NULL);
compositor = get_compositor_for_display (display);
g_return_val_if_fail (compositor, NULL);
priv = meta_compositor_get_instance_private (compositor);
return priv->windows;
}
void
meta_focus_stage_window (MetaDisplay *display,
guint32 timestamp)
{
ClutterStage *stage;
Window window;
stage = CLUTTER_STAGE (meta_get_stage_for_display (display));
if (!stage)
return;
window = meta_x11_get_stage_window (stage);
if (window == None)
return;
meta_x11_display_set_input_focus_xwindow (display->x11_display,
window,
timestamp);
}
gboolean
meta_stage_is_focused (MetaDisplay *display)
{
ClutterStage *stage;
Window window;
if (meta_is_wayland_compositor ())
return TRUE;
stage = CLUTTER_STAGE (meta_get_stage_for_display (display));
if (!stage)
return FALSE;
window = meta_x11_get_stage_window (stage);
if (window == None)
return FALSE;
return (display->x11_display->focus_xwindow == window);
}
static gboolean
grab_devices (MetaModalOptions options,
guint32 timestamp)
{
MetaBackend *backend = META_BACKEND (meta_get_backend ());
gboolean pointer_grabbed = FALSE;
gboolean keyboard_grabbed = FALSE;
if ((options & META_MODAL_POINTER_ALREADY_GRABBED) == 0)
{
if (!meta_backend_grab_device (backend, META_VIRTUAL_CORE_POINTER_ID, timestamp))
goto fail;
pointer_grabbed = TRUE;
}
if ((options & META_MODAL_KEYBOARD_ALREADY_GRABBED) == 0)
{
if (!meta_backend_grab_device (backend, META_VIRTUAL_CORE_KEYBOARD_ID, timestamp))
goto fail;
keyboard_grabbed = TRUE;
}
return TRUE;
fail:
if (pointer_grabbed)
meta_backend_ungrab_device (backend, META_VIRTUAL_CORE_POINTER_ID, timestamp);
if (keyboard_grabbed)
meta_backend_ungrab_device (backend, META_VIRTUAL_CORE_KEYBOARD_ID, timestamp);
return FALSE;
}
gboolean
meta_begin_modal_for_plugin (MetaCompositor *compositor,
MetaPlugin *plugin,
MetaModalOptions options,
guint32 timestamp)
{
/* To some extent this duplicates code in meta_display_begin_grab_op(), but there
* are significant differences in how we handle grabs that make it difficult to
* merge the two.
*/
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
MetaDisplay *display = priv->display;
#ifdef HAVE_WAYLAND
if (display->grab_op == META_GRAB_OP_WAYLAND_POPUP)
{
MetaWaylandSeat *seat = meta_wayland_compositor_get_default ()->seat;
meta_wayland_pointer_end_popup_grab (seat->pointer);
}
#endif
if (is_modal (display) || display->grab_op != META_GRAB_OP_NONE)
return FALSE;
if (display->x11_display)
{
/* XXX: why is this needed? */
XIUngrabDevice (display->x11_display->xdisplay,
META_VIRTUAL_CORE_POINTER_ID,
timestamp);
XSync (display->x11_display->xdisplay, False);
}
if (!grab_devices (options, timestamp))
return FALSE;
display->grab_op = META_GRAB_OP_COMPOSITOR;
display->event_route = META_EVENT_ROUTE_COMPOSITOR_GRAB;
display->grab_window = NULL;
display->grab_have_pointer = TRUE;
display->grab_have_keyboard = TRUE;
g_signal_emit_by_name (display, "grab-op-begin",
meta_plugin_get_display (plugin),
display->grab_window, display->grab_op);
if (meta_is_wayland_compositor ())
{
meta_display_sync_wayland_input_focus (display);
meta_display_cancel_touch (display);
#ifdef HAVE_WAYLAND
meta_dnd_wayland_handle_begin_modal (compositor);
#endif
}
return TRUE;
}
void
meta_end_modal_for_plugin (MetaCompositor *compositor,
MetaPlugin *plugin,
guint32 timestamp)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
MetaDisplay *display = priv->display;
MetaBackend *backend = meta_get_backend ();
MetaWindow *grab_window = display->grab_window;
MetaGrabOp grab_op = display->grab_op;
g_return_if_fail (is_modal (display));
display->grab_op = META_GRAB_OP_NONE;
display->event_route = META_EVENT_ROUTE_NORMAL;
display->grab_window = NULL;
display->grab_have_pointer = FALSE;
display->grab_have_keyboard = FALSE;
meta_backend_ungrab_device (backend, META_VIRTUAL_CORE_POINTER_ID, timestamp);
meta_backend_ungrab_device (backend, META_VIRTUAL_CORE_KEYBOARD_ID, timestamp);
#ifdef HAVE_WAYLAND
if (meta_is_wayland_compositor ())
{
meta_dnd_wayland_handle_end_modal (compositor);
meta_display_sync_wayland_input_focus (display);
}
#endif
g_signal_emit_by_name (display, "grab-op-end",
meta_plugin_get_display (plugin),
grab_window, grab_op);
}
static void
after_stage_paint (ClutterStage *stage,
gpointer data)
{
MetaCompositor *compositor = data;
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
GList *l;
for (l = priv->windows; l; l = l->next)
meta_window_actor_post_paint (l->data);
#ifdef HAVE_WAYLAND
if (meta_is_wayland_compositor ())
meta_wayland_compositor_paint_finished (meta_wayland_compositor_get_default ());
#endif
}
static void
redirect_windows (MetaX11Display *x11_display)
{
Display *xdisplay = meta_x11_display_get_xdisplay (x11_display);
Window xroot = meta_x11_display_get_xroot (x11_display);
int screen_number = meta_x11_display_get_screen_number (x11_display);
guint n_retries;
guint max_retries;
if (meta_get_replace_current_wm ())
max_retries = 5;
else
max_retries = 1;
n_retries = 0;
/* Some compositors (like old versions of Mutter) might not properly unredirect
* subwindows before destroying the WM selection window; so we wait a while
* for such a compositor to exit before giving up.
*/
while (TRUE)
{
meta_x11_error_trap_push (x11_display);
XCompositeRedirectSubwindows (xdisplay, xroot, CompositeRedirectManual);
XSync (xdisplay, FALSE);
if (!meta_x11_error_trap_pop_with_return (x11_display))
break;
if (n_retries == max_retries)
{
/* This probably means that a non-WM compositor like xcompmgr is running;
* we have no way to get it to exit */
meta_fatal (_("Another compositing manager is already running on screen %i on display “%s”."),
screen_number, x11_display->name);
}
n_retries++;
g_usleep (G_USEC_PER_SEC);
}
}
void
meta_compositor_redirect_x11_windows (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
MetaDisplay *display = priv->display;
if (display->x11_display)
redirect_windows (display->x11_display);
}
void
meta_compositor_manage (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
MetaDisplay *display = priv->display;
MetaBackend *backend = meta_get_backend ();
if (display->x11_display)
meta_x11_display_set_cm_selection (display->x11_display);
priv->stage = meta_backend_get_stage (backend);
priv->stage_presented_id =
g_signal_connect (priv->stage, "presented",
G_CALLBACK (on_presented),
compositor);
/* We use connect_after() here to accomodate code in GNOME Shell that,
* when benchmarking drawing performance, connects to ::after-paint
* and calls glFinish(). The timing information from that will be
* more accurate if we hold off until that completes before we signal
* apps to begin drawing the next frame. If there are no other
* connections to ::after-paint, connect() vs. connect_after() doesn't
* matter.
*/
priv->stage_after_paint_id =
g_signal_connect_after (priv->stage, "after-paint",
G_CALLBACK (after_stage_paint), compositor);
clutter_stage_set_sync_delay (CLUTTER_STAGE (priv->stage), META_SYNC_DELAY);
priv->window_group = meta_window_group_new (display);
priv->top_window_group = meta_window_group_new (display);
priv->feedback_group = meta_window_group_new (display);
clutter_actor_add_child (priv->stage, priv->window_group);
clutter_actor_add_child (priv->stage, priv->top_window_group);
clutter_actor_add_child (priv->stage, priv->feedback_group);
META_COMPOSITOR_GET_CLASS (compositor)->manage (compositor);
meta_compositor_redirect_x11_windows (compositor);
priv->plugin_mgr = meta_plugin_manager_new (compositor);
}
void
meta_compositor_unmanage (MetaCompositor *compositor)
{
META_COMPOSITOR_GET_CLASS (compositor)->unmanage (compositor);
}
void
meta_compositor_add_window (MetaCompositor *compositor,
MetaWindow *window)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
MetaWindowActor *window_actor;
ClutterActor *window_group;
GType window_actor_type = G_TYPE_INVALID;
switch (window->client_type)
{
case META_WINDOW_CLIENT_TYPE_X11:
window_actor_type = META_TYPE_WINDOW_ACTOR_X11;
break;
#ifdef HAVE_WAYLAND
case META_WINDOW_CLIENT_TYPE_WAYLAND:
window_actor_type = META_TYPE_WINDOW_ACTOR_WAYLAND;
break;
#endif
default:
g_return_if_reached ();
}
window_actor = g_object_new (window_actor_type,
"meta-window", window,
NULL);
if (window->layer == META_LAYER_OVERRIDE_REDIRECT)
window_group = priv->top_window_group;
else
window_group = priv->window_group;
clutter_actor_add_child (window_group, CLUTTER_ACTOR (window_actor));
/* Initial position in the stack is arbitrary; stacking will be synced
* before we first paint.
*/
priv->windows = g_list_append (priv->windows, window_actor);
sync_actor_stacking (compositor);
}
static void
meta_compositor_real_remove_window (MetaCompositor *compositor,
MetaWindow *window)
{
MetaWindowActor *window_actor = meta_window_actor_from_window (window);
meta_window_actor_queue_destroy (window_actor);
}
void
meta_compositor_remove_window (MetaCompositor *compositor,
MetaWindow *window)
{
META_COMPOSITOR_GET_CLASS (compositor)->remove_window (compositor, window);
}
void
meta_compositor_remove_window_actor (MetaCompositor *compositor,
MetaWindowActor *window_actor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
priv->windows = g_list_remove (priv->windows, window_actor);
}
void
meta_compositor_sync_updates_frozen (MetaCompositor *compositor,
MetaWindow *window)
{
MetaWindowActor *window_actor = meta_window_actor_from_window (window);
meta_window_actor_sync_updates_frozen (window_actor);
}
void
meta_compositor_queue_frame_drawn (MetaCompositor *compositor,
MetaWindow *window,
gboolean no_delay_frame)
{
MetaWindowActor *window_actor = meta_window_actor_from_window (window);
meta_window_actor_queue_frame_drawn (window_actor, no_delay_frame);
}
void
meta_compositor_window_shape_changed (MetaCompositor *compositor,
MetaWindow *window)
{
MetaWindowActor *window_actor;
window_actor = meta_window_actor_from_window (window);
if (!window_actor)
return;
meta_window_actor_x11_update_shape (META_WINDOW_ACTOR_X11 (window_actor));
}
void
meta_compositor_window_opacity_changed (MetaCompositor *compositor,
MetaWindow *window)
{
MetaWindowActor *window_actor;
window_actor = meta_window_actor_from_window (window);
if (!window_actor)
return;
meta_window_actor_update_opacity (window_actor);
}
gboolean
meta_compositor_filter_keybinding (MetaCompositor *compositor,
MetaKeyBinding *binding)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
return meta_plugin_manager_filter_keybinding (priv->plugin_mgr, binding);
}
void
meta_compositor_show_window (MetaCompositor *compositor,
MetaWindow *window,
MetaCompEffect effect)
{
MetaWindowActor *window_actor = meta_window_actor_from_window (window);
meta_window_actor_show (window_actor, effect);
}
void
meta_compositor_hide_window (MetaCompositor *compositor,
MetaWindow *window,
MetaCompEffect effect)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
MetaWindowActor *window_actor = meta_window_actor_from_window (window);
meta_window_actor_hide (window_actor, effect);
meta_stack_tracker_queue_sync_stack (priv->display->stack_tracker);
}
void
meta_compositor_size_change_window (MetaCompositor *compositor,
MetaWindow *window,
MetaSizeChange which_change,
MetaRectangle *old_frame_rect,
MetaRectangle *old_buffer_rect)
{
MetaWindowActor *window_actor = meta_window_actor_from_window (window);
meta_window_actor_size_change (window_actor, which_change, old_frame_rect, old_buffer_rect);
}
void
meta_compositor_switch_workspace (MetaCompositor *compositor,
MetaWorkspace *from,
MetaWorkspace *to,
MetaMotionDirection direction)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
gint to_indx, from_indx;
to_indx = meta_workspace_index (to);
from_indx = meta_workspace_index (from);
priv->switch_workspace_in_progress++;
if (!meta_plugin_manager_switch_workspace (priv->plugin_mgr,
from_indx,
to_indx,
direction))
{
priv->switch_workspace_in_progress--;
/* We have to explicitely call this to fix up stacking order of the
* actors; this is because the abs stacking position of actors does not
* necessarily change during the window hiding/unhiding, only their
* relative position toward the destkop window.
*/
meta_finish_workspace_switch (compositor);
}
}
static void
sync_actor_stacking (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
GList *children;
GList *expected_window_node;
GList *tmp;
GList *old;
GList *backgrounds;
gboolean has_windows;
gboolean reordered;
/* NB: The first entries in the lists are stacked the lowest */
/* Restacking will trigger full screen redraws, so it's worth a
* little effort to make sure we actually need to restack before
* we go ahead and do it */
children = clutter_actor_get_children (priv->window_group);
has_windows = FALSE;
reordered = FALSE;
/* We allow for actors in the window group other than the actors we
* know about, but it's up to a plugin to try and keep them stacked correctly
* (we really need extra API to make that reliable.)
*/
/* First we collect a list of all backgrounds, and check if they're at the
* bottom. Then we check if the window actors are in the correct sequence */
backgrounds = NULL;
expected_window_node = priv->windows;
for (old = children; old != NULL; old = old->next)
{
ClutterActor *actor = old->data;
if (META_IS_BACKGROUND_GROUP (actor) ||
META_IS_BACKGROUND_ACTOR (actor))
{
backgrounds = g_list_prepend (backgrounds, actor);
if (has_windows)
reordered = TRUE;
}
else if (META_IS_WINDOW_ACTOR (actor) && !reordered)
{
has_windows = TRUE;
if (expected_window_node != NULL && actor == expected_window_node->data)
expected_window_node = expected_window_node->next;
else
reordered = TRUE;
}
}
g_list_free (children);
if (!reordered)
{
g_list_free (backgrounds);
return;
}
/* reorder the actors by lowering them in turn to the bottom of the stack.
* windows first, then background.
*
* We reorder the actors even if they're not parented to the window group,
* to allow stacking to work with intermediate actors (eg during effects)
*/
for (tmp = g_list_last (priv->windows); tmp != NULL; tmp = tmp->prev)
{
ClutterActor *actor = tmp->data, *parent;
parent = clutter_actor_get_parent (actor);
clutter_actor_set_child_below_sibling (parent, actor, NULL);
}
/* we prepended the backgrounds above so the last actor in the list
* should get lowered to the bottom last.
*/
for (tmp = backgrounds; tmp != NULL; tmp = tmp->next)
{
ClutterActor *actor = tmp->data, *parent;
parent = clutter_actor_get_parent (actor);
clutter_actor_set_child_below_sibling (parent, actor, NULL);
}
g_list_free (backgrounds);
}
/*
* Find the top most window that is visible on the screen. The intention of
* this is to avoid offscreen windows that isn't actually part of the visible
* desktop (such as the UI frames override redirect window).
*/
static MetaWindowActor *
get_top_visible_window_actor (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
GList *l;
for (l = g_list_last (priv->windows); l; l = l->prev)
{
MetaWindowActor *window_actor = l->data;
MetaWindow *window = meta_window_actor_get_meta_window (window_actor);
MetaRectangle buffer_rect;
MetaRectangle display_rect = { 0 };
if (!window->visible_to_compositor)
continue;
meta_window_get_buffer_rect (window, &buffer_rect);
meta_display_get_size (priv->display,
&display_rect.width, &display_rect.height);
if (meta_rectangle_overlap (&display_rect, &buffer_rect))
return window_actor;
}
return NULL;
}
static void
on_top_window_actor_destroyed (MetaWindowActor *window_actor,
MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
priv->top_window_actor = NULL;
priv->top_window_actor_destroy_id = 0;
priv->windows = g_list_remove (priv->windows, window_actor);
meta_stack_tracker_queue_sync_stack (priv->display->stack_tracker);
}
void
meta_compositor_sync_stack (MetaCompositor *compositor,
GList *stack)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
MetaWindowActor *top_window_actor;
GList *old_stack;
/* This is painful because hidden windows that we are in the process
* of animating out of existence. They'll be at the bottom of the
* stack of X windows, but we want to leave them in their old position
* until the animation effect finishes.
*/
/* Sources: first window is the highest */
stack = g_list_copy (stack); /* The new stack of MetaWindow */
old_stack = g_list_reverse (priv->windows); /* The old stack of MetaWindowActor */
priv->windows = NULL;
while (TRUE)
{
MetaWindowActor *old_actor = NULL, *stack_actor = NULL, *actor;
MetaWindow *old_window = NULL, *stack_window = NULL, *window;
/* Find the remaining top actor in our existing stack (ignoring
* windows that have been hidden and are no longer animating) */
while (old_stack)
{
old_actor = old_stack->data;
old_window = meta_window_actor_get_meta_window (old_actor);
if ((old_window->hidden || old_window->unmanaging) &&
!meta_window_actor_effect_in_progress (old_actor))
{
old_stack = g_list_delete_link (old_stack, old_stack);
old_actor = NULL;
}
else
break;
}
/* And the remaining top actor in the new stack */
while (stack)
{
stack_window = stack->data;
stack_actor = meta_window_actor_from_window (stack_window);
if (!stack_actor)
{
meta_verbose ("Failed to find corresponding MetaWindowActor "
"for window %s\n", meta_window_get_description (stack_window));
stack = g_list_delete_link (stack, stack);
}
else
break;
}
if (!old_actor && !stack_actor) /* Nothing more to stack */
break;
/* We usually prefer the window in the new stack, but if if we
* found a hidden window in the process of being animated out
* of existence in the old stack we use that instead. We've
* filtered out non-animating hidden windows above.
*/
if (old_actor &&
(!stack_actor || old_window->hidden || old_window->unmanaging))
{
actor = old_actor;
window = old_window;
}
else
{
actor = stack_actor;
window = stack_window;
}
/* OK, we know what actor we want next. Add it to our window
* list, and remove it from both source lists. (It will
* be at the front of at least one, hopefully it will be
* near the front of the other.)
*/
priv->windows = g_list_prepend (priv->windows, actor);
stack = g_list_remove (stack, window);
old_stack = g_list_remove (old_stack, actor);
}
sync_actor_stacking (compositor);
top_window_actor = get_top_visible_window_actor (compositor);
if (priv->top_window_actor == top_window_actor)
return;
g_clear_signal_handler (&priv->top_window_actor_destroy_id,
priv->top_window_actor);
priv->top_window_actor = top_window_actor;
if (priv->top_window_actor)
priv->top_window_actor_destroy_id =
g_signal_connect (priv->top_window_actor, "destroy",
G_CALLBACK (on_top_window_actor_destroyed),
compositor);
}
void
meta_compositor_sync_window_geometry (MetaCompositor *compositor,
MetaWindow *window,
gboolean did_placement)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
MetaWindowActor *window_actor = meta_window_actor_from_window (window);
MetaWindowActorChanges changes;
changes = meta_window_actor_sync_actor_geometry (window_actor, did_placement);
if (changes & META_WINDOW_ACTOR_CHANGE_SIZE)
meta_plugin_manager_event_size_changed (priv->plugin_mgr, window_actor);
}
static void
on_presented (ClutterStage *stage,
CoglFrameEvent event,
ClutterFrameInfo *frame_info,
MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
GList *l;
if (event == COGL_FRAME_EVENT_COMPLETE)
{
gint64 presentation_time_cogl = frame_info->presentation_time;
gint64 presentation_time;
if (presentation_time_cogl != 0)
{
/* Cogl reports presentation in terms of its own clock, which is
* guaranteed to be in nanoseconds but with no specified base. The
* normal case with the open source GPU drivers on Linux 3.8 and
* newer is that the base of cogl_get_clock_time() is that of
* clock_gettime(CLOCK_MONOTONIC), so the same as g_get_monotonic_time),
* but there's no exposure of that through the API. clock_gettime()
* is fairly fast, so calling it twice and subtracting to get a
* nearly-zero number is acceptable, if a litle ugly.
*/
gint64 current_cogl_time = cogl_get_clock_time (priv->context);
gint64 current_monotonic_time = g_get_monotonic_time ();
presentation_time =
current_monotonic_time + (presentation_time_cogl - current_cogl_time) / 1000;
}
else
{
presentation_time = 0;
}
for (l = priv->windows; l; l = l->next)
meta_window_actor_frame_complete (l->data, frame_info, presentation_time);
}
}
static void
meta_compositor_real_pre_paint (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
GList *l;
for (l = priv->windows; l; l = l->next)
meta_window_actor_pre_paint (l->data);
}
static void
meta_compositor_pre_paint (MetaCompositor *compositor)
{
COGL_TRACE_BEGIN_SCOPED (MetaCompositorPrePaint,
"Compositor (pre-paint)");
META_COMPOSITOR_GET_CLASS (compositor)->pre_paint (compositor);
}
static gboolean
meta_pre_paint_func (gpointer data)
{
MetaCompositor *compositor = data;
meta_compositor_pre_paint (compositor);
return TRUE;
}
static void
meta_compositor_real_post_paint (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
CoglGraphicsResetStatus status;
status = cogl_get_graphics_reset_status (priv->context);
switch (status)
{
case COGL_GRAPHICS_RESET_STATUS_NO_ERROR:
break;
case COGL_GRAPHICS_RESET_STATUS_PURGED_CONTEXT_RESET:
g_signal_emit_by_name (priv->display, "gl-video-memory-purged");
clutter_actor_queue_redraw (CLUTTER_ACTOR (priv->stage));
break;
default:
/* The ARB_robustness spec says that, on error, the application
should destroy the old context and create a new one. Since we
don't have the necessary plumbing to do this we'll simply
restart the process. Obviously we can't do this when we are
a wayland compositor but in that case we shouldn't get here
since we don't enable robustness in that case. */
g_assert (!meta_is_wayland_compositor ());
meta_restart (NULL);
break;
}
}
static void
meta_compositor_post_paint (MetaCompositor *compositor)
{
COGL_TRACE_BEGIN_SCOPED (MetaCompositorPostPaint,
"Compositor (post-paint)");
META_COMPOSITOR_GET_CLASS (compositor)->post_paint (compositor);
}
static gboolean
meta_post_paint_func (gpointer data)
{
MetaCompositor *compositor = data;
meta_compositor_post_paint (compositor);
return TRUE;
}
static void
meta_compositor_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
MetaCompositor *compositor = META_COMPOSITOR (object);
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
switch (prop_id)
{
case PROP_DISPLAY:
priv->display = g_value_get_object (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
meta_compositor_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
MetaCompositor *compositor = META_COMPOSITOR (object);
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
switch (prop_id)
{
case PROP_DISPLAY:
g_value_set_object (value, priv->display);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
meta_compositor_init (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
MetaBackend *backend = meta_get_backend ();
ClutterBackend *clutter_backend = meta_backend_get_clutter_backend (backend);
priv->context = clutter_backend->cogl_context;
priv->pre_paint_func_id =
clutter_threads_add_repaint_func_full (CLUTTER_REPAINT_FLAGS_PRE_PAINT,
meta_pre_paint_func,
compositor,
NULL);
priv->post_paint_func_id =
clutter_threads_add_repaint_func_full (CLUTTER_REPAINT_FLAGS_POST_PAINT,
meta_post_paint_func,
compositor,
NULL);
}
static void
meta_compositor_dispose (GObject *object)
{
MetaCompositor *compositor = META_COMPOSITOR (object);
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
g_clear_signal_handler (&priv->stage_after_paint_id, priv->stage);
g_clear_signal_handler (&priv->stage_presented_id, priv->stage);
g_clear_handle_id (&priv->pre_paint_func_id,
clutter_threads_remove_repaint_func);
g_clear_handle_id (&priv->post_paint_func_id,
clutter_threads_remove_repaint_func);
g_clear_signal_handler (&priv->top_window_actor_destroy_id,
priv->top_window_actor);
g_clear_pointer (&priv->window_group, clutter_actor_destroy);
g_clear_pointer (&priv->top_window_group, clutter_actor_destroy);
g_clear_pointer (&priv->feedback_group, clutter_actor_destroy);
g_clear_pointer (&priv->windows, g_list_free);
G_OBJECT_CLASS (meta_compositor_parent_class)->dispose (object);
}
static void
meta_compositor_class_init (MetaCompositorClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->set_property = meta_compositor_set_property;
object_class->get_property = meta_compositor_get_property;
object_class->dispose = meta_compositor_dispose;
klass->remove_window = meta_compositor_real_remove_window;
klass->pre_paint = meta_compositor_real_pre_paint;
klass->post_paint = meta_compositor_real_post_paint;
obj_props[PROP_DISPLAY] =
g_param_spec_object ("display",
"display",
"MetaDisplay",
META_TYPE_DISPLAY,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (object_class, N_PROPS, obj_props);
}
/**
* meta_disable_unredirect_for_display:
* @display: a #MetaDisplay
*
* Disables unredirection, can be usefull in situations where having
* unredirected windows is undesireable like when recording a video.
*
*/
void
meta_disable_unredirect_for_display (MetaDisplay *display)
{
MetaCompositor *compositor;
MetaCompositorPrivate *priv;
if (display->closing)
return;
compositor = get_compositor_for_display (display);
priv = meta_compositor_get_instance_private (compositor);
priv->disable_unredirect_count++;
}
/**
* meta_enable_unredirect_for_display:
* @display: a #MetaDisplay
*
* Enables unredirection which reduces the overhead for apps like games.
*
*/
void
meta_enable_unredirect_for_display (MetaDisplay *display)
{
MetaCompositor *compositor;
MetaCompositorPrivate *priv;
if (display->closing)
return;
compositor = get_compositor_for_display (display);
priv = meta_compositor_get_instance_private (compositor);
if (priv->disable_unredirect_count == 0)
g_warning ("Called enable_unredirect_for_display while unredirection is enabled.");
if (priv->disable_unredirect_count > 0)
priv->disable_unredirect_count--;
}
gboolean
meta_compositor_is_unredirect_inhibited (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
return priv->disable_unredirect_count > 0;
}
#define FLASH_TIME_MS 50
static void
flash_out_completed (ClutterTimeline *timeline,
gboolean is_finished,
gpointer user_data)
{
ClutterActor *flash = CLUTTER_ACTOR (user_data);
clutter_actor_destroy (flash);
}
void
meta_compositor_flash_display (MetaCompositor *compositor,
MetaDisplay *display)
{
ClutterActor *stage;
ClutterActor *flash;
ClutterTransition *transition;
gfloat width, height;
stage = meta_get_stage_for_display (display);
clutter_actor_get_size (stage, &width, &height);
flash = clutter_actor_new ();
clutter_actor_set_background_color (flash, CLUTTER_COLOR_Black);
clutter_actor_set_size (flash, width, height);
clutter_actor_set_opacity (flash, 0);
clutter_actor_add_child (stage, flash);
clutter_actor_save_easing_state (flash);
clutter_actor_set_easing_mode (flash, CLUTTER_EASE_IN_QUAD);
clutter_actor_set_easing_duration (flash, FLASH_TIME_MS);
clutter_actor_set_opacity (flash, 192);
transition = clutter_actor_get_transition (flash, "opacity");
clutter_timeline_set_auto_reverse (CLUTTER_TIMELINE (transition), TRUE);
clutter_timeline_set_repeat_count (CLUTTER_TIMELINE (transition), 2);
g_signal_connect (transition, "stopped",
G_CALLBACK (flash_out_completed), flash);
clutter_actor_restore_easing_state (flash);
}
static void
window_flash_out_completed (ClutterTimeline *timeline,
gboolean is_finished,
gpointer user_data)
{
ClutterActor *flash = CLUTTER_ACTOR (user_data);
clutter_actor_destroy (flash);
}
void
meta_compositor_flash_window (MetaCompositor *compositor,
MetaWindow *window)
{
ClutterActor *window_actor =
CLUTTER_ACTOR (meta_window_actor_from_window (window));
ClutterActor *flash;
ClutterTransition *transition;
flash = clutter_actor_new ();
clutter_actor_set_background_color (flash, CLUTTER_COLOR_Black);
clutter_actor_set_size (flash, window->rect.width, window->rect.height);
clutter_actor_set_position (flash,
window->custom_frame_extents.left,
window->custom_frame_extents.top);
clutter_actor_set_opacity (flash, 0);
clutter_actor_add_child (window_actor, flash);
clutter_actor_save_easing_state (flash);
clutter_actor_set_easing_mode (flash, CLUTTER_EASE_IN_QUAD);
clutter_actor_set_easing_duration (flash, FLASH_TIME_MS);
clutter_actor_set_opacity (flash, 192);
transition = clutter_actor_get_transition (flash, "opacity");
clutter_timeline_set_auto_reverse (CLUTTER_TIMELINE (transition), TRUE);
clutter_timeline_set_repeat_count (CLUTTER_TIMELINE (transition), 2);
g_signal_connect (transition, "stopped",
G_CALLBACK (window_flash_out_completed), flash);
clutter_actor_restore_easing_state (flash);
}
/**
* meta_compositor_monotonic_time_to_server_time:
* @display: a #MetaDisplay
* @monotonic_time: time in the units of g_get_monotonic_time()
*
* _NET_WM_FRAME_DRAWN and _NET_WM_FRAME_TIMINGS messages represent time
* as a "high resolution server time" - this is the server time interpolated
* to microsecond resolution. The advantage of this time representation
* is that if X server is running on the same computer as a client, and
* the Xserver uses 'clock_gettime(CLOCK_MONOTONIC, ...)' for the server
* time, the client can detect this, and all such clients will share a
* a time representation with high accuracy. If there is not a common
* time source, then the time synchronization will be less accurate.
*/
gint64
meta_compositor_monotonic_time_to_server_time (MetaDisplay *display,
gint64 monotonic_time)
{
MetaCompositor *compositor = display->compositor;
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
if (priv->server_time_query_time == 0 ||
(!priv->server_time_is_monotonic_time &&
monotonic_time > priv->server_time_query_time + 10*1000*1000)) /* 10 seconds */
{
guint32 server_time = meta_display_get_current_time_roundtrip (display);
gint64 server_time_usec = (gint64)server_time * 1000;
gint64 current_monotonic_time = g_get_monotonic_time ();
priv->server_time_query_time = current_monotonic_time;
/* If the server time is within a second of the monotonic time,
* we assume that they are identical. This seems like a big margin,
* but we want to be as robust as possible even if the system
* is under load and our processing of the server response is
* delayed.
*/
if (server_time_usec > current_monotonic_time - 1000*1000 &&
server_time_usec < current_monotonic_time + 1000*1000)
priv->server_time_is_monotonic_time = TRUE;
priv->server_time_offset = server_time_usec - current_monotonic_time;
}
if (priv->server_time_is_monotonic_time)
return monotonic_time;
else
return monotonic_time + priv->server_time_offset;
}
void
meta_compositor_show_tile_preview (MetaCompositor *compositor,
MetaWindow *window,
MetaRectangle *tile_rect,
int tile_monitor_number)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
meta_plugin_manager_show_tile_preview (priv->plugin_mgr,
window, tile_rect, tile_monitor_number);
}
void
meta_compositor_hide_tile_preview (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
meta_plugin_manager_hide_tile_preview (priv->plugin_mgr);
}
void
meta_compositor_show_window_menu (MetaCompositor *compositor,
MetaWindow *window,
MetaWindowMenuType menu,
int x,
int y)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
meta_plugin_manager_show_window_menu (priv->plugin_mgr, window, menu, x, y);
}
void
meta_compositor_show_window_menu_for_rect (MetaCompositor *compositor,
MetaWindow *window,
MetaWindowMenuType menu,
MetaRectangle *rect)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
meta_plugin_manager_show_window_menu_for_rect (priv->plugin_mgr, window, menu, rect);
}
MetaCloseDialog *
meta_compositor_create_close_dialog (MetaCompositor *compositor,
MetaWindow *window)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
return meta_plugin_manager_create_close_dialog (priv->plugin_mgr,
window);
}
MetaInhibitShortcutsDialog *
meta_compositor_create_inhibit_shortcuts_dialog (MetaCompositor *compositor,
MetaWindow *window)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
return meta_plugin_manager_create_inhibit_shortcuts_dialog (priv->plugin_mgr,
window);
}
void
meta_compositor_locate_pointer (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
meta_plugin_manager_locate_pointer (priv->plugin_mgr);
}
MetaPluginManager *
meta_compositor_get_plugin_manager (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
return priv->plugin_mgr;
}
MetaDisplay *
meta_compositor_get_display (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
return priv->display;
}
ClutterStage *
meta_compositor_get_stage (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
return CLUTTER_STAGE (priv->stage);
}
MetaWindowActor *
meta_compositor_get_top_window_actor (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
return priv->top_window_actor;
}
gboolean
meta_compositor_is_switching_workspace (MetaCompositor *compositor)
{
MetaCompositorPrivate *priv =
meta_compositor_get_instance_private (compositor);
return priv->switch_workspace_in_progress > 0;
}
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