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0e758a9e65
mutter/src/compositor/compositor.c
Jasper St. Pierre 0e758a9e65 display: Establish a separate state variable for routing events 
We've long used a switch statement on the grab operation to determine
where events should go. The issue with MetaGrabOp is that it's a mixture
of a few different things, including event routing, state management,
and the behavior to choose during operations.

This leads to poorly defined event routing and hard-to-follow logic,
since it's sometimes unclear what should point where, and our utility
methods for determining grab operations apart can be poorly named.

To fix this, establish the concept of a "event route", which describes
where events should be routed to.
2014-08-15 16:08:49 -04:00

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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.
*
* meta_compositor_maximize_window() and meta_compositor_unmaximize_window()
* are transitions within the visible state. The window is resized __before__
* the call, so it may be necessary to readjust the display based on the
* old_rect to start the animation.
*
* # 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_screen()
* - top window group, accessible with meta_get_top_window_group_for_screen()
*
* 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 <clutter/x11/clutter-x11.h>
#include "core.h"
#include <meta/screen.h>
#include <meta/errors.h>
#include <meta/window.h>
#include "compositor-private.h"
#include <meta/compositor-mutter.h>
#include <meta/prefs.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-window-actor-private.h"
#include "meta-window-group.h"
#include "window-private.h" /* to check window->hidden */
#include "display-private.h" /* for meta_display_lookup_x_window() and meta_display_cancel_touch() */
#include "util-private.h"
#include "frame.h"
#include <X11/extensions/shape.h>
#include <X11/extensions/Xcomposite.h>
#include "backends/x11/meta-backend-x11.h"
#include "wayland/meta-wayland-private.h"
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)
{
GList *l;
/* Finish hiding and showing actors for the new workspace */
for (l = compositor->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)
{
/* FIXME -- must redo stacking order */
compositor->switch_workspace_in_progress--;
if (compositor->switch_workspace_in_progress < 0)
{
g_warning ("Error in workspace_switch accounting!");
compositor->switch_workspace_in_progress = 0;
}
if (!compositor->switch_workspace_in_progress)
meta_finish_workspace_switch (compositor);
}
void
meta_compositor_destroy (MetaCompositor *compositor)
{
clutter_threads_remove_repaint_func (compositor->repaint_func_id);
}
static void
process_damage (MetaCompositor *compositor,
XDamageNotifyEvent *event,
MetaWindow *window)
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (meta_window_get_compositor_private (window));
meta_window_actor_process_x11_damage (window_actor, event);
compositor->frame_has_updated_xsurfaces = TRUE;
}
/* compat helper */
static MetaCompositor *
get_compositor_for_screen (MetaScreen *screen)
{
return screen->display->compositor;
}
/**
* meta_get_stage_for_screen:
* @screen: a #MetaScreen
*
* Returns: (transfer none): The #ClutterStage for the screen
*/
ClutterActor *
meta_get_stage_for_screen (MetaScreen *screen)
{
MetaCompositor *compositor = get_compositor_for_screen (screen);
return compositor->stage;
}
/**
* meta_get_window_group_for_screen:
* @screen: a #MetaScreen
*
* Returns: (transfer none): The window group corresponding to @screen
*/
ClutterActor *
meta_get_window_group_for_screen (MetaScreen *screen)
{
MetaCompositor *compositor = get_compositor_for_screen (screen);
return compositor->window_group;
}
/**
* meta_get_top_window_group_for_screen:
* @screen: a #MetaScreen
*
* Returns: (transfer none): The top window group corresponding to @screen
*/
ClutterActor *
meta_get_top_window_group_for_screen (MetaScreen *screen)
{
MetaCompositor *compositor = get_compositor_for_screen (screen);
return compositor->top_window_group;
}
/**
* meta_get_window_actors:
* @screen: a #MetaScreen
*
* Returns: (transfer none) (element-type Clutter.Actor): The set of #MetaWindowActor on @screen
*/
GList *
meta_get_window_actors (MetaScreen *screen)
{
MetaCompositor *compositor = get_compositor_for_screen (screen);
return compositor->windows;
}
void
meta_set_stage_input_region (MetaScreen *screen,
XserverRegion region)
{
/* As a wayland compositor we can simply ignore all this trickery
* for setting an input region on the stage for capturing events in
* clutter since all input comes to us first and we get to choose
* who else sees them.
*/
if (!meta_is_wayland_compositor ())
{
MetaDisplay *display = screen->display;
MetaCompositor *compositor = display->compositor;
Display *xdpy = meta_display_get_xdisplay (display);
Window xstage = clutter_x11_get_stage_window (CLUTTER_STAGE (compositor->stage));
XFixesSetWindowShapeRegion (xdpy, xstage, ShapeInput, 0, 0, region);
/* It's generally a good heuristic that when a crossing event is generated because
* we reshape the overlay, we don't want it to affect focus-follows-mouse focus -
* it's not the user doing something, it's the environment changing under the user.
*/
meta_display_add_ignored_crossing_serial (display, XNextRequest (xdpy));
XFixesSetWindowShapeRegion (xdpy, compositor->output, ShapeInput, 0, 0, region);
}
}
void
meta_empty_stage_input_region (MetaScreen *screen)
{
/* Using a static region here is a bit hacky, but Metacity never opens more than
* one XDisplay, so it works fine. */
static XserverRegion region = None;
if (region == None)
{
MetaDisplay *display = meta_screen_get_display (screen);
Display *xdpy = meta_display_get_xdisplay (display);
region = XFixesCreateRegion (xdpy, NULL, 0);
}
meta_set_stage_input_region (screen, region);
}
void
meta_focus_stage_window (MetaScreen *screen,
guint32 timestamp)
{
ClutterStage *stage;
Window window;
stage = CLUTTER_STAGE (meta_get_stage_for_screen (screen));
if (!stage)
return;
window = clutter_x11_get_stage_window (stage);
if (window == None)
return;
meta_display_set_input_focus_xwindow (screen->display,
screen,
window,
timestamp);
}
gboolean
meta_stage_is_focused (MetaScreen *screen)
{
ClutterStage *stage;
Window window;
if (meta_is_wayland_compositor ())
return TRUE;
stage = CLUTTER_STAGE (meta_get_stage_for_screen (screen));
if (!stage)
return FALSE;
window = clutter_x11_get_stage_window (stage);
if (window == None)
return FALSE;
return (screen->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.
*/
MetaDisplay *display = compositor->display;
if (is_modal (display) || display->grab_op != META_GRAB_OP_NONE)
return FALSE;
/* XXX: why is this needed? */
XIUngrabDevice (display->xdisplay,
META_VIRTUAL_CORE_POINTER_ID,
timestamp);
XSync (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_screen (plugin),
display->grab_window, display->grab_op);
if (meta_is_wayland_compositor ())
{
meta_display_sync_wayland_input_focus (display);
meta_display_cancel_touch (display);
}
return TRUE;
}
void
meta_end_modal_for_plugin (MetaCompositor *compositor,
MetaPlugin *plugin,
guint32 timestamp)
{
MetaDisplay *display = compositor->display;
MetaBackend *backend = meta_get_backend ();
g_return_if_fail (is_modal (display));
g_signal_emit_by_name (display, "grab-op-end",
meta_plugin_get_screen (plugin),
display->grab_window, display->grab_op);
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);
if (meta_is_wayland_compositor ())
meta_display_sync_wayland_input_focus (display);
}
static void
after_stage_paint (ClutterStage *stage,
gpointer data)
{
MetaCompositor *compositor = data;
GList *l;
for (l = compositor->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 (MetaScreen *screen)
{
MetaDisplay *display = meta_screen_get_display (screen);
Display *xdisplay = meta_display_get_xdisplay (display);
Window xroot = meta_screen_get_xroot (screen);
int screen_number = meta_screen_get_screen_number (screen);
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_error_trap_push (display);
XCompositeRedirectSubwindows (xdisplay, xroot, CompositeRedirectManual);
XSync (xdisplay, FALSE);
if (!meta_error_trap_pop_with_return (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, display->name);
}
n_retries++;
g_usleep (G_USEC_PER_SEC);
}
}
void
meta_compositor_manage (MetaCompositor *compositor)
{
MetaDisplay *display = compositor->display;
Display *xdisplay = display->xdisplay;
MetaScreen *screen = display->screen;
meta_screen_set_cm_selection (display->screen);
{
MetaBackend *backend = meta_get_backend ();
compositor->stage = meta_backend_get_stage (backend);
}
/* 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.
*/
g_signal_connect_after (CLUTTER_STAGE (compositor->stage), "after-paint",
G_CALLBACK (after_stage_paint), compositor);
clutter_stage_set_sync_delay (CLUTTER_STAGE (compositor->stage), META_SYNC_DELAY);
compositor->window_group = meta_window_group_new (screen);
compositor->top_window_group = meta_window_group_new (screen);
clutter_actor_add_child (compositor->stage, compositor->window_group);
clutter_actor_add_child (compositor->stage, compositor->top_window_group);
if (meta_is_wayland_compositor ())
{
/* NB: When running as a wayland compositor we don't need an X
* composite overlay window, and we don't need to play any input
* region tricks to redirect events into clutter. */
compositor->output = None;
}
else
{
Window xwin;
compositor->output = screen->composite_overlay_window;
xwin = meta_backend_x11_get_xwindow (META_BACKEND_X11 (meta_get_backend ()));
XReparentWindow (xdisplay, xwin, compositor->output, 0, 0);
meta_empty_stage_input_region (screen);
/* Make sure there isn't any left-over output shape on the
* overlay window by setting the whole screen to be an
* output region.
*
* Note: there doesn't seem to be any real chance of that
* because the X server will destroy the overlay window
* when the last client using it exits.
*/
XFixesSetWindowShapeRegion (xdisplay, compositor->output, ShapeBounding, 0, 0, None);
/* Map overlay window before redirecting windows offscreen so we catch their
* contents until we show the stage.
*/
XMapWindow (xdisplay, compositor->output);
}
redirect_windows (display->screen);
compositor->plugin_mgr = meta_plugin_manager_new (compositor);
}
void
meta_compositor_unmanage (MetaCompositor *compositor)
{
if (!meta_is_wayland_compositor ())
{
MetaDisplay *display = compositor->display;
Display *xdisplay = meta_display_get_xdisplay (display);
Window xroot = display->screen->xroot;
/* This is the most important part of cleanup - we have to do this
* before giving up the window manager selection or the next
* window manager won't be able to redirect subwindows */
XCompositeUnredirectSubwindows (xdisplay, xroot, CompositeRedirectManual);
}
}
/**
* meta_shape_cow_for_window:
* @compositor: A #MetaCompositor
* @window: (nullable): A #MetaWindow to shape the COW for
*
* Sets an bounding shape on the COW so that the given window
* is exposed. If @window is %NULL it clears the shape again.
*
* Used so we can unredirect windows, by shaping away the part
* of the COW, letting the raw window be seen through below.
*/
static void
meta_shape_cow_for_window (MetaCompositor *compositor,
MetaWindow *window)
{
MetaDisplay *display = compositor->display;
Display *xdisplay = meta_display_get_xdisplay (display);
if (window == NULL)
XFixesSetWindowShapeRegion (xdisplay, compositor->output, ShapeBounding, 0, 0, None);
else
{
XserverRegion output_region;
XRectangle screen_rect, window_bounds;
int width, height;
MetaRectangle rect;
meta_window_get_frame_rect (window, &rect);
window_bounds.x = rect.x;
window_bounds.y = rect.y;
window_bounds.width = rect.width;
window_bounds.height = rect.height;
meta_screen_get_size (display->screen, &width, &height);
screen_rect.x = 0;
screen_rect.y = 0;
screen_rect.width = width;
screen_rect.height = height;
output_region = XFixesCreateRegion (xdisplay, &window_bounds, 1);
XFixesInvertRegion (xdisplay, output_region, &screen_rect, output_region);
XFixesSetWindowShapeRegion (xdisplay, compositor->output, ShapeBounding, 0, 0, output_region);
XFixesDestroyRegion (xdisplay, output_region);
}
}
static void
set_unredirected_window (MetaCompositor *compositor,
MetaWindow *window)
{
if (compositor->unredirected_window == window)
return;
if (compositor->unredirected_window != NULL)
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (meta_window_get_compositor_private (compositor->unredirected_window));
meta_window_actor_set_unredirected (window_actor, FALSE);
}
compositor->unredirected_window = window;
if (compositor->unredirected_window != NULL)
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (meta_window_get_compositor_private (compositor->unredirected_window));
meta_window_actor_set_unredirected (window_actor, TRUE);
}
meta_shape_cow_for_window (compositor, compositor->unredirected_window);
}
void
meta_compositor_add_window (MetaCompositor *compositor,
MetaWindow *window)
{
MetaDisplay *display = compositor->display;
meta_error_trap_push (display);
meta_window_actor_new (window);
sync_actor_stacking (compositor);
meta_error_trap_pop (display);
}
void
meta_compositor_remove_window (MetaCompositor *compositor,
MetaWindow *window)
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (meta_window_get_compositor_private (window));
if (compositor->unredirected_window == window)
set_unredirected_window (compositor, NULL);
meta_window_actor_destroy (window_actor);
}
void
meta_compositor_sync_updates_frozen (MetaCompositor *compositor,
MetaWindow *window)
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (meta_window_get_compositor_private (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 (meta_window_get_compositor_private (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 (meta_window_get_compositor_private (window));
if (!window_actor)
return;
meta_window_actor_update_shape (window_actor);
}
void
meta_compositor_window_opacity_changed (MetaCompositor *compositor,
MetaWindow *window)
{
MetaWindowActor *window_actor;
window_actor = META_WINDOW_ACTOR (meta_window_get_compositor_private (window));
if (!window_actor)
return;
meta_window_actor_update_opacity (window_actor);
}
void
meta_compositor_window_surface_changed (MetaCompositor *compositor,
MetaWindow *window)
{
MetaWindowActor *window_actor;
window_actor = META_WINDOW_ACTOR (meta_window_get_compositor_private (window));
if (!window_actor)
return;
meta_window_actor_update_surface (window_actor);
}
/**
* meta_compositor_process_event: (skip)
* @compositor:
* @event:
* @window:
*
*/
gboolean
meta_compositor_process_event (MetaCompositor *compositor,
XEvent *event,
MetaWindow *window)
{
if (!meta_is_wayland_compositor () &&
event->type == meta_display_get_damage_event_base (compositor->display) + XDamageNotify)
{
/* Core code doesn't handle damage events, so we need to extract the MetaWindow
* ourselves
*/
if (window == NULL)
{
Window xwin = ((XDamageNotifyEvent *) event)->drawable;
window = meta_display_lookup_x_window (compositor->display, xwin);
}
if (window)
process_damage (compositor, (XDamageNotifyEvent *) event, window);
}
/* Clutter needs to know about MapNotify events otherwise it will
think the stage is invisible */
if (!meta_is_wayland_compositor () && event->type == MapNotify)
clutter_x11_handle_event (event);
/* The above handling is basically just "observing" the events, so we return
* FALSE to indicate that the event should not be filtered out; if we have
* GTK+ windows in the same process, GTK+ needs the ConfigureNotify event, for example.
*/
return FALSE;
}
gboolean
meta_compositor_filter_keybinding (MetaCompositor *compositor,
MetaKeyBinding *binding)
{
return meta_plugin_manager_filter_keybinding (compositor->plugin_mgr, binding);
}
void
meta_compositor_show_window (MetaCompositor *compositor,
MetaWindow *window,
MetaCompEffect effect)
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (meta_window_get_compositor_private (window));
meta_window_actor_show (window_actor, effect);
}
void
meta_compositor_hide_window (MetaCompositor *compositor,
MetaWindow *window,
MetaCompEffect effect)
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (meta_window_get_compositor_private (window));
meta_window_actor_hide (window_actor, effect);
}
void
meta_compositor_maximize_window (MetaCompositor *compositor,
MetaWindow *window,
MetaRectangle *old_rect,
MetaRectangle *new_rect)
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (meta_window_get_compositor_private (window));
meta_window_actor_maximize (window_actor, old_rect, new_rect);
}
void
meta_compositor_unmaximize_window (MetaCompositor *compositor,
MetaWindow *window,
MetaRectangle *old_rect,
MetaRectangle *new_rect)
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (meta_window_get_compositor_private (window));
meta_window_actor_unmaximize (window_actor, old_rect, new_rect);
}
void
meta_compositor_switch_workspace (MetaCompositor *compositor,
MetaWorkspace *from,
MetaWorkspace *to,
MetaMotionDirection direction)
{
gint to_indx, from_indx;
to_indx = meta_workspace_index (to);
from_indx = meta_workspace_index (from);
compositor->switch_workspace_in_progress++;
if (!meta_plugin_manager_switch_workspace (compositor->plugin_mgr,
from_indx,
to_indx,
direction))
{
compositor->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)
{
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 (compositor->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 = compositor->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 (compositor->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);
}
void
meta_compositor_sync_stack (MetaCompositor *compositor,
GList *stack)
{
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 (compositor->windows); /* The old stack of MetaWindowActor */
compositor->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 &&
!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 (meta_window_get_compositor_private (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))
{
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.)
*/
compositor->windows = g_list_prepend (compositor->windows, actor);
stack = g_list_remove (stack, window);
old_stack = g_list_remove (old_stack, actor);
}
sync_actor_stacking (compositor);
}
void
meta_compositor_sync_window_geometry (MetaCompositor *compositor,
MetaWindow *window,
gboolean did_placement)
{
MetaWindowActor *window_actor = META_WINDOW_ACTOR (meta_window_get_compositor_private (window));
meta_window_actor_sync_actor_geometry (window_actor, did_placement);
}
static void
frame_callback (CoglOnscreen *onscreen,
CoglFrameEvent event,
CoglFrameInfo *frame_info,
void *user_data)
{
MetaCompositor *compositor = user_data;
GList *l;
if (event == COGL_FRAME_EVENT_COMPLETE)
{
gint64 presentation_time_cogl = cogl_frame_info_get_presentation_time (frame_info);
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.
*/
CoglContext *context = cogl_framebuffer_get_context (COGL_FRAMEBUFFER (onscreen));
gint64 current_cogl_time = cogl_get_clock_time (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 = compositor->windows; l; l = l->next)
meta_window_actor_frame_complete (l->data, frame_info, presentation_time);
}
}
static void
pre_paint_windows (MetaCompositor *compositor)
{
GList *l;
MetaWindowActor *top_window;
if (compositor->onscreen == NULL)
{
compositor->onscreen = COGL_ONSCREEN (cogl_get_draw_framebuffer ());
compositor->frame_closure = cogl_onscreen_add_frame_callback (compositor->onscreen,
frame_callback,
compositor,
NULL);
}
if (compositor->windows == NULL)
return;
top_window = g_list_last (compositor->windows)->data;
if (meta_window_actor_should_unredirect (top_window) &&
compositor->disable_unredirect_count == 0)
set_unredirected_window (compositor, meta_window_actor_get_meta_window (top_window));
else
set_unredirected_window (compositor, NULL);
for (l = compositor->windows; l; l = l->next)
meta_window_actor_pre_paint (l->data);
if (compositor->frame_has_updated_xsurfaces)
{
/* We need to make sure that any X drawing that happens before
* the XDamageSubtract() for each window above is visible to
* subsequent GL rendering; the only standardized way to do this
* is EXT_x11_sync_object, which isn't yet widely available. For
* now, we count on details of Xorg and the open source drivers,
* and hope for the best otherwise.
*
* Xorg and open source driver specifics:
*
* The X server makes sure to flush drawing to the kernel before
* sending out damage events, but since we use
* DamageReportBoundingBox there may be drawing between the last
* damage event and the XDamageSubtract() that needs to be
* flushed as well.
*
* Xorg always makes sure that drawing is flushed to the kernel
* before writing events or responses to the client, so any
* round trip request at this point is sufficient to flush the
* GLX buffers.
*/
XSync (compositor->display->xdisplay, False);
compositor->frame_has_updated_xsurfaces = FALSE;
}
}
static gboolean
meta_repaint_func (gpointer data)
{
MetaCompositor *compositor = data;
pre_paint_windows (compositor);
return TRUE;
}
static void
on_shadow_factory_changed (MetaShadowFactory *factory,
MetaCompositor *compositor)
{
GList *l;
for (l = compositor->windows; l; l = l->next)
meta_window_actor_invalidate_shadow (l->data);
}
/**
* meta_compositor_new: (skip)
* @display:
*
*/
MetaCompositor *
meta_compositor_new (MetaDisplay *display)
{
MetaCompositor *compositor;
compositor = g_new0 (MetaCompositor, 1);
compositor->display = display;
if (g_getenv("META_DISABLE_MIPMAPS"))
compositor->no_mipmaps = TRUE;
g_signal_connect (meta_shadow_factory_get_default (),
"changed",
G_CALLBACK (on_shadow_factory_changed),
compositor);
compositor->repaint_func_id = clutter_threads_add_repaint_func (meta_repaint_func,
compositor,
NULL);
return compositor;
}
/**
* meta_get_overlay_window: (skip)
* @screen: a #MetaScreen
*
*/
Window
meta_get_overlay_window (MetaScreen *screen)
{
MetaCompositor *compositor = get_compositor_for_screen (screen);
return compositor->output;
}
/**
* meta_disable_unredirect_for_screen:
* @screen: a #MetaScreen
*
* Disables unredirection, can be usefull in situations where having
* unredirected windows is undesireable like when recording a video.
*
*/
void
meta_disable_unredirect_for_screen (MetaScreen *screen)
{
MetaCompositor *compositor = get_compositor_for_screen (screen);
compositor->disable_unredirect_count++;
}
/**
* meta_enable_unredirect_for_screen:
* @screen: a #MetaScreen
*
* Enables unredirection which reduces the overhead for apps like games.
*
*/
void
meta_enable_unredirect_for_screen (MetaScreen *screen)
{
MetaCompositor *compositor = get_compositor_for_screen (screen);
if (compositor->disable_unredirect_count == 0)
g_warning ("Called enable_unredirect_for_screen while unredirection is enabled.");
if (compositor->disable_unredirect_count > 0)
compositor->disable_unredirect_count--;
}
#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_screen (MetaCompositor *compositor,
MetaScreen *screen)
{
ClutterActor *stage;
ClutterActor *flash;
ClutterTransition *transition;
gfloat width, height;
stage = meta_get_stage_for_screen (screen);
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);
}
/**
* 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;
if (compositor->server_time_query_time == 0 ||
(!compositor->server_time_is_monotonic_time &&
monotonic_time > compositor->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 ();
compositor->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)
compositor->server_time_is_monotonic_time = TRUE;
compositor->server_time_offset = server_time_usec - current_monotonic_time;
}
if (compositor->server_time_is_monotonic_time)
return monotonic_time;
else
return monotonic_time + compositor->server_time_offset;
}
void
meta_compositor_show_tile_preview (MetaCompositor *compositor,
MetaWindow *window,
MetaRectangle *tile_rect,
int tile_monitor_number)
{
meta_plugin_manager_show_tile_preview (compositor->plugin_mgr,
window, tile_rect, tile_monitor_number);
}
void
meta_compositor_hide_tile_preview (MetaCompositor *compositor)
{
meta_plugin_manager_hide_tile_preview (compositor->plugin_mgr);
}
void
meta_compositor_show_window_menu (MetaCompositor *compositor,
MetaWindow *window,
MetaWindowMenuType menu,
int x,
int y)
{
meta_plugin_manager_show_window_menu (compositor->plugin_mgr, window, menu, x, y);
}
void
meta_compositor_show_window_menu_for_rect (MetaCompositor *compositor,
MetaWindow *window,
MetaWindowMenuType menu,
MetaRectangle *rect)
{
meta_plugin_manager_show_window_menu_for_rect (compositor->plugin_mgr, window, menu, rect);
}
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