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mutter/clutter/x11/clutter-event-x11.c
Robert Bragg 771348b369 x11: minimize nasty artefacts when resizing windows 
This is a workaround for a race condition when resizing windows while
there are in-flight glXCopySubBuffer blits happening.

The problem stems from the fact that rectangles for the blits are
described relative to the bottom left of the window and because we can't
guarantee control over the X window gravity used when resizing so the
gravity is typically NorthWest not SouthWest.

This means if you grow a window vertically the server will make sure to
place the old contents of the window at the top-left/north-west of your
new larger window, but that may happen asynchronous to GLX preparing to
do a blit specified relative to the bottom-left/south-west of the window
(based on the old smaller window geometry).

When the GLX issued blit finally happens relative to the new bottom of
your window, the destination will have shifted relative to the top-left
where all the pixels you care about are so it will result in a nasty
artefact making resizing look very ugly!

We can't currently fix this completely, in-part because the window
manager tends to trample any gravity we might set.  This workaround
instead simply disables blits for a while if we are notified of any
resizes happening so if the user is resizing a window via the window
manager then they may see an artefact for one frame but then we will
fallback to redrawing the full stage until the cooling off period is
over.
2010-09-29 15:12:59 +01:00

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/* Clutter.
* An OpenGL based 'interactive canvas' library.
*
* Copyright (C) 2006, 2007, 2008 OpenedHand Ltd
* Copyright (C) 2009, 2010 Intel Corp.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*
*
* Authored by:
* Matthew Allum <mallum@openedhand.com>
* Emmanuele Bassi <ebassi@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "clutter-stage-x11.h"
#include "clutter-backend-x11.h"
#include "clutter-keymap-x11.h"
#include "clutter-x11.h"
#include "../clutter-backend.h"
#include "../clutter-event.h"
#include "../clutter-private.h"
#include "../clutter-debug.h"
#include "../clutter-main.h"
#include "cogl/cogl-internal.h"
#include <string.h>
#include <glib.h>
#ifdef HAVE_XFIXES
#include <X11/extensions/Xfixes.h>
#endif
#include <X11/Xatom.h>
#ifdef HAVE_XINPUT
#include <X11/extensions/XInput.h>
#endif
#ifdef HAVE_XKB
#include <X11/XKBlib.h>
#endif
/* XEMBED protocol support for toolkit embedding */
#define XEMBED_MAPPED (1 << 0)
#define MAX_SUPPORTED_XEMBED_VERSION 1
#define XEMBED_EMBEDDED_NOTIFY 0
#define XEMBED_WINDOW_ACTIVATE 1
#define XEMBED_WINDOW_DEACTIVATE 2
#define XEMBED_REQUEST_FOCUS 3
#define XEMBED_FOCUS_IN 4
#define XEMBED_FOCUS_OUT 5
#define XEMBED_FOCUS_NEXT 6
#define XEMBED_FOCUS_PREV 7
/* 8-9 were used for XEMBED_GRAB_KEY/XEMBED_UNGRAB_KEY */
#define XEMBED_MODALITY_ON 10
#define XEMBED_MODALITY_OFF 11
#define XEMBED_REGISTER_ACCELERATOR 12
#define XEMBED_UNREGISTER_ACCELERATOR 13
#define XEMBED_ACTIVATE_ACCELERATOR 14
static Window ParentEmbedderWin = None;
typedef struct _ClutterEventSource ClutterEventSource;
struct _ClutterEventSource
{
GSource source;
ClutterBackend *backend;
GPollFD event_poll_fd;
};
struct _ClutterEventX11
{
/* additional fields for Key events */
gint key_group;
guint key_is_modifier : 1;
guint num_lock_set : 1;
guint caps_lock_set : 1;
};
ClutterEventX11 *
_clutter_event_x11_new (void)
{
return g_slice_new0 (ClutterEventX11);
}
ClutterEventX11 *
_clutter_event_x11_copy (ClutterEventX11 *event_x11)
{
if (event_x11 != NULL)
return g_slice_dup (ClutterEventX11, event_x11);
return NULL;
}
void
_clutter_event_x11_free (ClutterEventX11 *event_x11)
{
if (event_x11 != NULL)
g_slice_free (ClutterEventX11, event_x11);
}
static gboolean clutter_event_prepare (GSource *source,
gint *timeout);
static gboolean clutter_event_check (GSource *source);
static gboolean clutter_event_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data);
static GList *event_sources = NULL;
static GSourceFuncs event_funcs = {
clutter_event_prepare,
clutter_event_check,
clutter_event_dispatch,
NULL
};
static GSource *
clutter_event_source_new (ClutterBackend *backend)
{
GSource *source = g_source_new (&event_funcs, sizeof (ClutterEventSource));
ClutterEventSource *event_source = (ClutterEventSource *) source;
#if GLIB_CHECK_VERSION (2, 25, 8)
g_source_set_name (source, "Clutter X11 Event");
#endif
event_source->backend = backend;
return source;
}
static gboolean
check_xpending (ClutterBackend *backend)
{
return XPending (CLUTTER_BACKEND_X11 (backend)->xdpy);
}
static gboolean
xembed_send_message (ClutterBackendX11 *backend_x11,
Window window,
long message,
long detail,
long data1,
long data2)
{
XEvent ev;
memset (&ev, 0, sizeof (ev));
ev.xclient.type = ClientMessage;
ev.xclient.window = window;
ev.xclient.message_type = backend_x11->atom_XEMBED;
ev.xclient.format = 32;
ev.xclient.data.l[0] = CurrentTime;
ev.xclient.data.l[1] = message;
ev.xclient.data.l[2] = detail;
ev.xclient.data.l[3] = data1;
ev.xclient.data.l[4] = data2;
clutter_x11_trap_x_errors ();
XSendEvent (backend_x11->xdpy, window, False, NoEventMask, &ev);
XSync (backend_x11->xdpy, False);
if (clutter_x11_untrap_x_errors ())
return False;
return True;
}
static void
xembed_set_info (ClutterBackendX11 *backend_x11,
Window window,
gint flags)
{
gint32 list[2];
list[0] = MAX_SUPPORTED_XEMBED_VERSION;
list[1] = XEMBED_MAPPED;
XChangeProperty (backend_x11->xdpy, window,
backend_x11->atom_XEMBED_INFO,
backend_x11->atom_XEMBED_INFO, 32,
PropModeReplace, (unsigned char *) list, 2);
}
void
_clutter_backend_x11_events_init (ClutterBackend *backend)
{
ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
GSource *source;
ClutterEventSource *event_source;
int connection_number;
connection_number = ConnectionNumber (backend_x11->xdpy);
CLUTTER_NOTE (EVENT, "Connection number: %d", connection_number);
source = backend_x11->event_source = clutter_event_source_new (backend);
event_source = (ClutterEventSource *) source;
g_source_set_priority (source, CLUTTER_PRIORITY_EVENTS);
event_source->event_poll_fd.fd = connection_number;
event_source->event_poll_fd.events = G_IO_IN;
event_sources = g_list_prepend (event_sources, event_source);
g_source_add_poll (source, &event_source->event_poll_fd);
g_source_set_can_recurse (source, TRUE);
g_source_attach (source, NULL);
}
void
_clutter_backend_x11_events_uninit (ClutterBackend *backend)
{
ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
if (backend_x11->event_source)
{
CLUTTER_NOTE (EVENT, "Destroying the event source");
event_sources = g_list_remove (event_sources,
backend_x11->event_source);
g_source_destroy (backend_x11->event_source);
g_source_unref (backend_x11->event_source);
backend_x11->event_source = NULL;
}
}
static void
update_last_event_time (ClutterBackendX11 *backend_x11,
XEvent *xevent)
{
Time current_time = CurrentTime;
Time last_time = backend_x11->last_event_time;
switch (xevent->type)
{
case KeyPress:
case KeyRelease:
current_time = xevent->xkey.time;
break;
case ButtonPress:
case ButtonRelease:
current_time = xevent->xbutton.time;
break;
case MotionNotify:
current_time = xevent->xmotion.time;
break;
case EnterNotify:
case LeaveNotify:
current_time = xevent->xcrossing.time;
break;
case PropertyNotify:
current_time = xevent->xproperty.time;
break;
default:
break;
}
/* only change the current event time if it's after the previous event
* time, or if it is at least 30 seconds earlier - in case the system
* clock was changed
*/
if ((current_time != CurrentTime) &&
(current_time > last_time || (last_time - current_time > (30 * 1000))))
backend_x11->last_event_time = current_time;
}
static void
set_user_time (ClutterBackendX11 *backend_x11,
Window *xwindow,
long timestamp)
{
if (timestamp != CLUTTER_CURRENT_TIME)
{
XChangeProperty (backend_x11->xdpy, *xwindow,
backend_x11->atom_NET_WM_USER_TIME,
XA_CARDINAL, 32, PropModeReplace,
(unsigned char *) &timestamp, 1);
}
}
#ifdef HAVE_XINPUT
static void
convert_xdevicekey_to_xkey (XDeviceKeyEvent *xkev,
XEvent *xevent)
{
xevent->xany.type = xevent->xkey.type = xkev->type;
xevent->xkey.serial = xkev->serial;
xevent->xkey.display = xkev->display;
xevent->xkey.window = xkev->window;
xevent->xkey.root = xkev->root;
xevent->xkey.subwindow = xkev->subwindow;
xevent->xkey.time = xkev->time;
xevent->xkey.x = xkev->x;
xevent->xkey.y = xkev->y;
xevent->xkey.x_root = xkev->x_root;
xevent->xkey.y_root = xkev->y_root;
xevent->xkey.state = xkev->state;
xevent->xkey.keycode = xkev->keycode;
xevent->xkey.same_screen = xkev->same_screen;
}
#endif /* HAVE_XINPUT */
static inline void
translate_key_event (ClutterBackendX11 *backend_x11,
ClutterEvent *event,
XEvent *xevent)
{
ClutterEventX11 *event_x11;
char buffer[256 + 1];
int n;
/* KeyEvents have platform specific data associated to them */
event_x11 = _clutter_event_x11_new ();
_clutter_event_set_platform_data (event, event_x11);
event->key.time = xevent->xkey.time;
event->key.modifier_state = (ClutterModifierType) xevent->xkey.state;
event->key.hardware_keycode = xevent->xkey.keycode;
/* keyval is the key ignoring all modifiers ('1' vs. '!') */
event->key.keyval =
_clutter_keymap_x11_translate_key_state (backend_x11->keymap,
event->key.hardware_keycode,
event->key.modifier_state,
NULL);
event_x11->key_group =
_clutter_keymap_x11_get_key_group (backend_x11->keymap,
event->key.modifier_state);
event_x11->key_is_modifier =
_clutter_keymap_x11_get_is_modifier (backend_x11->keymap,
event->key.hardware_keycode);
event_x11->num_lock_set =
_clutter_keymap_x11_get_num_lock_state (backend_x11->keymap);
event_x11->caps_lock_set =
_clutter_keymap_x11_get_caps_lock_state (backend_x11->keymap);
/* unicode_value is the printable representation */
n = XLookupString (&xevent->xkey, buffer, sizeof (buffer) - 1, NULL, NULL);
if (n != NoSymbol)
{
event->key.unicode_value = g_utf8_get_char_validated (buffer, n);
if ((event->key.unicode_value != -1) &&
(event->key.unicode_value != -2))
goto out;
}
else
event->key.unicode_value = (gunichar)'\0';
out:
return;
}
static gboolean
handle_wm_protocols_event (ClutterBackendX11 *backend_x11,
Window window,
XEvent *xevent)
{
Atom atom = (Atom) xevent->xclient.data.l[0];
if (atom == backend_x11->atom_WM_DELETE_WINDOW &&
xevent->xany.window == window)
{
/* the WM_DELETE_WINDOW is a request: we do not destroy
* the window right away, as it might contain vital data;
* we relay the event to the application and we let it
* handle the request
*/
CLUTTER_NOTE (EVENT, "delete window:\txid: %ld",
xevent->xclient.window);
set_user_time (backend_x11,
&window,
xevent->xclient.data.l[1]);
return TRUE;
}
else if (atom == backend_x11->atom_NET_WM_PING &&
xevent->xany.window == window)
{
XClientMessageEvent xclient = xevent->xclient;
xclient.window = backend_x11->xwin_root;
XSendEvent (backend_x11->xdpy, xclient.window,
False,
SubstructureRedirectMask | SubstructureNotifyMask,
(XEvent *) &xclient);
return FALSE;
}
/* do not send any of the WM_PROTOCOLS events to the queue */
return FALSE;
}
static gboolean
handle_xembed_event (ClutterBackendX11 *backend_x11,
XEvent *xevent)
{
ClutterActor *stage;
stage = clutter_stage_get_default ();
switch (xevent->xclient.data.l[1])
{
case XEMBED_EMBEDDED_NOTIFY:
CLUTTER_NOTE (EVENT, "got XEMBED_EMBEDDED_NOTIFY from %lx",
xevent->xclient.data.l[3]);
ParentEmbedderWin = xevent->xclient.data.l[3];
clutter_actor_realize (stage);
clutter_actor_show (stage);
xembed_set_info (backend_x11,
clutter_x11_get_stage_window (CLUTTER_STAGE (stage)),
XEMBED_MAPPED);
break;
case XEMBED_WINDOW_ACTIVATE:
CLUTTER_NOTE (EVENT, "got XEMBED_WINDOW_ACTIVATE");
break;
case XEMBED_WINDOW_DEACTIVATE:
CLUTTER_NOTE (EVENT, "got XEMBED_WINDOW_DEACTIVATE");
break;
case XEMBED_FOCUS_IN:
CLUTTER_NOTE (EVENT, "got XEMBED_FOCUS_IN");
if (ParentEmbedderWin)
xembed_send_message (backend_x11, ParentEmbedderWin,
XEMBED_FOCUS_NEXT,
0, 0, 0);
break;
default:
CLUTTER_NOTE (EVENT, "got unknown XEMBED message");
break;
}
/* do not propagate the XEMBED events to the stage */
return FALSE;
}
static gboolean
clipped_redraws_cool_off_cb (void *data)
{
ClutterStageX11 *stage_x11 = data;
stage_x11->clipped_redraws_cool_off = 0;
return FALSE;
}
static gboolean
event_translate (ClutterBackend *backend,
ClutterEvent *event,
XEvent *xevent)
{
ClutterBackendX11 *backend_x11;
ClutterStageX11 *stage_x11;
ClutterStage *stage;
ClutterStageWindow *impl;
ClutterDeviceManager *manager;
gboolean res, not_yet_handled = FALSE;
Window xwindow, stage_xwindow;
ClutterInputDevice *device;
backend_x11 = CLUTTER_BACKEND_X11 (backend);
xwindow = xevent->xany.window;
if (backend_x11->event_filters)
{
GSList *node;
node = backend_x11->event_filters;
while (node)
{
ClutterX11EventFilter *filter = node->data;
switch (filter->func (xevent, event, filter->data))
{
case CLUTTER_X11_FILTER_CONTINUE:
break;
case CLUTTER_X11_FILTER_TRANSLATE:
return TRUE;
case CLUTTER_X11_FILTER_REMOVE:
return FALSE;
default:
break;
}
node = node->next;
}
}
/* Pass the event through Cogl */
if (_cogl_xlib_handle_event (xevent) == COGL_XLIB_FILTER_REMOVE)
return FALSE;
/* Do further processing only on events for the stage window (the x11
* filters might be getting events for other windows, so do not mess
* them about.
*/
stage = clutter_x11_get_stage_from_window (xwindow);
if (stage == NULL)
return FALSE;
impl = _clutter_stage_get_window (stage);
stage_x11 = CLUTTER_STAGE_X11 (impl);
stage_xwindow = xwindow; /* clutter_x11_get_stage_window (stage); */
event->any.stage = stage;
res = TRUE;
update_last_event_time (backend_x11, xevent);
manager = clutter_device_manager_get_default ();
switch (xevent->type)
{
case ConfigureNotify:
if (!stage_x11->is_foreign_xwin)
{
CLUTTER_NOTE (BACKEND, "%s: ConfigureNotify[%x] (%d, %d)",
G_STRLOC,
(unsigned int) stage_x11->xwin,
xevent->xconfigure.width,
xevent->xconfigure.height);
/* Queue a relayout - we want glViewport to be called
* with the correct values, and this is done in ClutterStage
* via _cogl_onscreen_clutter_backend_set_size ().
*
* We queue a relayout, because if this ConfigureNotify is
* in response to a size we set in the application, the
* set_size above is essentially a null-op.
*
* Make sure we do this only when the size has changed,
* otherwise we end up relayouting on window moves.
*/
if ((stage_x11->state & CLUTTER_STAGE_STATE_FULLSCREEN) ||
(stage_x11->xwin_width != xevent->xconfigure.width) ||
(stage_x11->xwin_height != xevent->xconfigure.height))
{
clutter_actor_queue_relayout (CLUTTER_ACTOR (stage));
}
/* If we're fullscreened, we want these variables to
* represent the size of the window before it was set
* to fullscreen.
*/
if (!(stage_x11->state & CLUTTER_STAGE_STATE_FULLSCREEN))
{
stage_x11->xwin_width = xevent->xconfigure.width;
stage_x11->xwin_height = xevent->xconfigure.height;
}
clutter_actor_set_size (CLUTTER_ACTOR (stage),
xevent->xconfigure.width,
xevent->xconfigure.height);
/* XXX: This is a workaround for a race condition when
* resizing windows while there are in-flight
* glXCopySubBuffer blits happening.
*
* The problem stems from the fact that rectangles for the
* blits are described relative to the bottom left of the
* window and because we can't guarantee control over the X
* window gravity used when resizing so the gravity is
* typically NorthWest not SouthWest.
*
* This means if you grow a window vertically the server
* will make sure to place the old contents of the window
* at the top-left/north-west of your new larger window, but
* that may happen asynchronous to GLX preparing to do a
* blit specified relative to the bottom-left/south-west of
* the window (based on the old smaller window geometry).
*
* When the GLX issued blit finally happens relative to the
* new bottom of your window, the destination will have
* shifted relative to the top-left where all the pixels you
* care about are so it will result in a nasty artefact
* making resizing look very ugly!
*
* We can't currently fix this completely, in-part because
* the window manager tends to trample any gravity we might
* set. This workaround instead simply disables blits for a
* while if we are notified of any resizes happening so if
* the user is resizing a window via the window manager then
* they may see an artefact for one frame but then we will
* fallback to redrawing the full stage until the cooling
* off period is over.
*/
if (stage_x11->clipped_redraws_cool_off)
g_source_remove (stage_x11->clipped_redraws_cool_off);
stage_x11->clipped_redraws_cool_off =
g_timeout_add_seconds (1, clipped_redraws_cool_off_cb, stage_x11);
CLUTTER_UNSET_PRIVATE_FLAGS (stage_x11->wrapper,
CLUTTER_IN_RESIZE);
/* the resize process is complete, so we can ask the stage
* to set up the GL viewport with the new size
*/
clutter_stage_ensure_viewport (stage);
}
res = FALSE;
break;
case PropertyNotify:
if (xevent->xproperty.atom == backend_x11->atom_NET_WM_STATE &&
xevent->xproperty.window == stage_xwindow &&
!stage_x11->is_foreign_xwin)
{
Atom type;
gint format;
gulong n_items, bytes_after;
guchar *data = NULL;
gboolean fullscreen_set = FALSE;
clutter_x11_trap_x_errors ();
XGetWindowProperty (backend_x11->xdpy, stage_xwindow,
backend_x11->atom_NET_WM_STATE,
0, G_MAXLONG,
False, XA_ATOM,
&type, &format, &n_items,
&bytes_after, &data);
clutter_x11_untrap_x_errors ();
if (type != None && data != NULL)
{
Atom *atoms = (Atom *) data;
gulong i;
gboolean is_fullscreen = FALSE;
for (i = 0; i < n_items; i++)
{
if (atoms[i] == backend_x11->atom_NET_WM_STATE_FULLSCREEN)
fullscreen_set = TRUE;
}
is_fullscreen =
(stage_x11->state & CLUTTER_STAGE_STATE_FULLSCREEN);
if (fullscreen_set != is_fullscreen)
{
if (fullscreen_set)
stage_x11->state |= CLUTTER_STAGE_STATE_FULLSCREEN;
else
stage_x11->state &= ~CLUTTER_STAGE_STATE_FULLSCREEN;
stage_x11->fullscreening = fullscreen_set;
event->type = CLUTTER_STAGE_STATE;
event->stage_state.changed_mask =
CLUTTER_STAGE_STATE_FULLSCREEN;
event->stage_state.new_state = stage_x11->state;
}
else
res = FALSE;
XFree (data);
}
else
res = FALSE;
}
else
res = FALSE;
break;
case MapNotify:
res = FALSE;
break;
case UnmapNotify:
res = FALSE;
break;
case FocusIn:
if (!(stage_x11->state & CLUTTER_STAGE_STATE_ACTIVATED))
{
/* TODO: check xevent->xfocus.detail ? */
stage_x11->state |= CLUTTER_STAGE_STATE_ACTIVATED;
event->type = CLUTTER_STAGE_STATE;
event->stage_state.changed_mask = CLUTTER_STAGE_STATE_ACTIVATED;
event->stage_state.new_state = stage_x11->state;
}
else
res = FALSE;
break;
case FocusOut:
if (stage_x11->state & CLUTTER_STAGE_STATE_ACTIVATED)
{
stage_x11->state &= ~CLUTTER_STAGE_STATE_ACTIVATED;
event->type = CLUTTER_STAGE_STATE;
event->stage_state.changed_mask = CLUTTER_STAGE_STATE_ACTIVATED;
event->stage_state.new_state = stage_x11->state;
}
else
res = FALSE;
break;
case Expose:
{
CLUTTER_NOTE (MULTISTAGE, "expose for stage: %p, redrawing", stage);
clutter_actor_queue_redraw (CLUTTER_ACTOR (stage));
XExposeEvent *expose = (XExposeEvent *)xevent;
ClutterPaintVolume clip;
ClutterVertex origin;
CLUTTER_NOTE (MULTISTAGE,
"expose for stage: %p, "
"redrawing (x=%d, y=%d, width=%d, height=%d)",
stage,
expose->x,
expose->y,
expose->width,
expose->height);
origin.x = expose->x;
origin.y = expose->y;
origin.z = 0;
_clutter_paint_volume_init_static (CLUTTER_ACTOR (stage), &clip);
clutter_paint_volume_set_origin (&clip, &origin);
clutter_paint_volume_set_width (&clip, expose->width);
clutter_paint_volume_set_height (&clip, expose->height);
_clutter_actor_queue_redraw_with_clip (CLUTTER_ACTOR (stage), 0, &clip);
clutter_paint_volume_free (&clip);
res = FALSE;
}
break;
case DestroyNotify:
CLUTTER_NOTE (EVENT, "destroy notify:\txid: %ld",
xevent->xdestroywindow.window);
if (xevent->xdestroywindow.window == stage_xwindow &&
!stage_x11->is_foreign_xwin)
event->type = event->any.type = CLUTTER_DESTROY_NOTIFY;
else
res = FALSE;
break;
case ClientMessage:
CLUTTER_NOTE (EVENT, "client message");
event->type = event->any.type = CLUTTER_CLIENT_MESSAGE;
if (xevent->xclient.message_type == backend_x11->atom_XEMBED)
res = handle_xembed_event (backend_x11, xevent);
else if (xevent->xclient.message_type == backend_x11->atom_WM_PROTOCOLS)
{
res = handle_wm_protocols_event (backend_x11, stage_xwindow, xevent);
event->type = event->any.type = CLUTTER_DELETE;
}
break;
case KeyPress:
event->key.type = event->type = CLUTTER_KEY_PRESS;
event->key.device =
clutter_device_manager_get_core_device (manager,
CLUTTER_KEYBOARD_DEVICE);
translate_key_event (backend_x11, event, xevent);
set_user_time (backend_x11, &xwindow, xevent->xkey.time);
break;
case KeyRelease:
/* old-style X11 terminals require that even modern X11 send
* KeyPress/KeyRelease pairs when auto-repeating. for this
* reason modern(-ish) API like XKB has a way to detect
* auto-repeat and do a single KeyRelease at the end of a
* KeyPress sequence.
*
* this check emulates XKB's detectable auto-repeat; we peek
* the next event and check if it's a KeyPress for the same key
* and timestamp - and then ignore it if it matches the
* KeyRelease
*
* if we have XKB, and autorepeat is enabled, then this becomes
* a no-op
*/
if (!backend_x11->have_xkb_autorepeat && XPending (xevent->xkey.display))
{
XEvent next_event;
XPeekEvent (xevent->xkey.display, &next_event);
if (next_event.type == KeyPress &&
next_event.xkey.keycode == xevent->xkey.keycode &&
next_event.xkey.time == xevent->xkey.time)
{
res = FALSE;
break;
}
}
event->key.type = event->type = CLUTTER_KEY_RELEASE;
event->key.device =
clutter_device_manager_get_core_device (manager,
CLUTTER_KEYBOARD_DEVICE);
translate_key_event (backend_x11, event, xevent);
break;
default:
/* ignore every other event */
not_yet_handled = TRUE;
break;
}
/* Input device event handling.. */
if (not_yet_handled)
{
device = clutter_device_manager_get_core_device (manager,
CLUTTER_POINTER_DEVICE);
/* Regular X event */
switch (xevent->type)
{
case ButtonPress:
switch (xevent->xbutton.button)
{
case 4: /* up */
case 5: /* down */
case 6: /* left */
case 7: /* right */
event->scroll.type = event->type = CLUTTER_SCROLL;
if (xevent->xbutton.button == 4)
event->scroll.direction = CLUTTER_SCROLL_UP;
else if (xevent->xbutton.button == 5)
event->scroll.direction = CLUTTER_SCROLL_DOWN;
else if (xevent->xbutton.button == 6)
event->scroll.direction = CLUTTER_SCROLL_LEFT;
else
event->scroll.direction = CLUTTER_SCROLL_RIGHT;
event->scroll.time = xevent->xbutton.time;
event->scroll.x = xevent->xbutton.x;
event->scroll.y = xevent->xbutton.y;
event->scroll.modifier_state = xevent->xbutton.state;
event->scroll.device = device;
break;
default:
event->button.type = event->type = CLUTTER_BUTTON_PRESS;
event->button.time = xevent->xbutton.time;
event->button.x = xevent->xbutton.x;
event->button.y = xevent->xbutton.y;
event->button.modifier_state = xevent->xbutton.state;
event->button.button = xevent->xbutton.button;
event->button.device = device;
break;
}
set_user_time (backend_x11, &xwindow, event->button.time);
res = TRUE;
break;
case ButtonRelease:
/* scroll events don't have a corresponding release */
if (xevent->xbutton.button == 4 ||
xevent->xbutton.button == 5 ||
xevent->xbutton.button == 6 ||
xevent->xbutton.button == 7)
{
res = FALSE;
goto out;
}
event->button.type = event->type = CLUTTER_BUTTON_RELEASE;
event->button.time = xevent->xbutton.time;
event->button.x = xevent->xbutton.x;
event->button.y = xevent->xbutton.y;
event->button.modifier_state = xevent->xbutton.state;
event->button.button = xevent->xbutton.button;
event->button.device = device;
res = TRUE;
break;
case MotionNotify:
event->motion.type = event->type = CLUTTER_MOTION;
event->motion.time = xevent->xmotion.time;
event->motion.x = xevent->xmotion.x;
event->motion.y = xevent->xmotion.y;
event->motion.modifier_state = xevent->xmotion.state;
event->motion.device = device;
res = TRUE;
break;
case EnterNotify:
/* we know that we are entering the stage here */
_clutter_input_device_set_stage (device, stage);
CLUTTER_NOTE (EVENT, "Entering the stage");
/* Convert enter notifies to motion events because X
doesn't emit the corresponding motion notify */
event->motion.type = event->type = CLUTTER_MOTION;
event->motion.time = xevent->xcrossing.time;
event->motion.x = xevent->xcrossing.x;
event->motion.y = xevent->xcrossing.y;
event->motion.modifier_state = xevent->xcrossing.state;
event->motion.source = CLUTTER_ACTOR (stage);
event->motion.device = device;
res = TRUE;
break;
case LeaveNotify:
if (device->stage == NULL)
{
CLUTTER_NOTE (EVENT,
"Discarding LeaveNotify for ButtonRelease "
"event off-stage");
res = FALSE;
goto out;
}
/* we know that we are leaving the stage here */
_clutter_input_device_set_stage (device, NULL);
CLUTTER_NOTE (EVENT, "Leaving the stage (time:%u)",
event->crossing.time);
event->crossing.type = event->type = CLUTTER_LEAVE;
event->crossing.time = xevent->xcrossing.time;
event->crossing.x = xevent->xcrossing.x;
event->crossing.y = xevent->xcrossing.y;
event->crossing.source = CLUTTER_ACTOR (stage);
event->crossing.device = device;
res = TRUE;
break;
default:
res = FALSE;
break;
}
}
/* XInput fun...*/
if (!res && clutter_x11_has_xinput ())
{
#ifdef HAVE_XINPUT
int *ev_types = backend_x11->event_types;
int button_press, button_release;
int key_press, key_release;
int motion_notify;
button_press = ev_types[CLUTTER_X11_XINPUT_BUTTON_PRESS_EVENT];
button_release = ev_types[CLUTTER_X11_XINPUT_BUTTON_RELEASE_EVENT];
motion_notify = ev_types[CLUTTER_X11_XINPUT_MOTION_NOTIFY_EVENT];
key_press = ev_types[CLUTTER_X11_XINPUT_KEY_PRESS_EVENT];
key_release = ev_types[CLUTTER_X11_XINPUT_KEY_RELEASE_EVENT];
CLUTTER_NOTE (EVENT, "XInput event type: %d", xevent->type);
if (xevent->type == button_press)
{
XDeviceButtonEvent *xbev = (XDeviceButtonEvent *) xevent;
device = _clutter_x11_get_device_for_xid (xbev->deviceid);
_clutter_input_device_set_stage (device, stage);
CLUTTER_NOTE (EVENT,
"XI ButtonPress for %li ('%s') at %d, %d",
xbev->deviceid,
device->device_name,
xbev->x,
xbev->y);
switch (xbev->button)
{
case 4:
case 5:
case 6:
case 7:
event->scroll.type = event->type = CLUTTER_SCROLL;
if (xbev->button == 4)
event->scroll.direction = CLUTTER_SCROLL_UP;
else if (xbev->button == 5)
event->scroll.direction = CLUTTER_SCROLL_DOWN;
else if (xbev->button == 6)
event->scroll.direction = CLUTTER_SCROLL_LEFT;
else
event->scroll.direction = CLUTTER_SCROLL_RIGHT;
event->scroll.time = xbev->time;
event->scroll.x = xbev->x;
event->scroll.y = xbev->y;
event->scroll.modifier_state = xbev->state;
event->scroll.device = device;
break;
default:
event->button.type = event->type = CLUTTER_BUTTON_PRESS;
event->button.time = xbev->time;
event->button.x = xbev->x;
event->button.y = xbev->y;
event->button.modifier_state = xbev->state;
event->button.button = xbev->button;
event->button.device = device;
break;
}
set_user_time (backend_x11, &xwindow, xbev->time);
res = TRUE;
}
else if (xevent->type == button_release)
{
XDeviceButtonEvent *xbev = (XDeviceButtonEvent *)xevent;
device = _clutter_x11_get_device_for_xid (xbev->deviceid);
_clutter_input_device_set_stage (device, stage);
CLUTTER_NOTE (EVENT, "XI ButtonRelease for %li ('%s') at %d, %d",
xbev->deviceid,
device->device_name,
xbev->x,
xbev->y);
/* scroll events don't have a corresponding release */
if (xbev->button == 4 ||
xbev->button == 5 ||
xbev->button == 6 ||
xbev->button == 7)
{
res = FALSE;
goto out;
}
event->button.type = event->type = CLUTTER_BUTTON_RELEASE;
event->button.time = xbev->time;
event->button.x = xbev->x;
event->button.y = xbev->y;
event->button.modifier_state = xbev->state;
event->button.button = xbev->button;
event->button.device = device;
res = TRUE;
}
else if (xevent->type == motion_notify)
{
XDeviceMotionEvent *xmev = (XDeviceMotionEvent *)xevent;
device = _clutter_x11_get_device_for_xid (xmev->deviceid);
_clutter_input_device_set_stage (device, stage);
CLUTTER_NOTE (EVENT, "XI Motion for %li ('%s') at %d, %d",
xmev->deviceid,
device->device_name,
xmev->x,
xmev->y);
event->motion.type = event->type = CLUTTER_MOTION;
event->motion.time = xmev->time;
event->motion.x = xmev->x;
event->motion.y = xmev->y;
event->motion.modifier_state = xmev->state;
event->motion.device = device;
res = TRUE;
}
else if (xevent->type == key_press || xevent->type == key_release)
{
/* the XInput 1.x handling of key presses/releases is broken:
* it makes key repeat, key presses and releases outside the
* window not generate events even when the window has focus
*/
XDeviceKeyEvent *xkev = (XDeviceKeyEvent *) xevent;
XEvent xevent_converted;
convert_xdevicekey_to_xkey (xkev, &xevent_converted);
event->key.type = event->type = (xevent->type == key_press)
? CLUTTER_KEY_PRESS
: CLUTTER_KEY_RELEASE;
translate_key_event (backend_x11, event, &xevent_converted);
if (xevent->type == key_press)
set_user_time (backend_x11, &xwindow, xkev->time);
}
else
#endif /* HAVE_XINPUT */
{
CLUTTER_NOTE (EVENT, "Uknown Event");
res = FALSE;
}
}
out:
return res;
}
static void
events_queue (ClutterBackend *backend)
{
ClutterBackendX11 *backend_x11 = CLUTTER_BACKEND_X11 (backend);
ClutterBackendX11Class *backend_x11_class =
CLUTTER_BACKEND_X11_GET_CLASS (backend_x11);
ClutterEvent *event;
Display *xdisplay = backend_x11->xdpy;
XEvent xevent;
ClutterMainContext *clutter_context;
clutter_context = _clutter_context_get_default ();
while (!clutter_events_pending () && XPending (xdisplay))
{
XNextEvent (xdisplay, &xevent);
if (backend_x11_class->handle_event (backend_x11, &xevent))
continue;
event = clutter_event_new (CLUTTER_NOTHING);
if (event_translate (backend, event, &xevent))
{
/* push directly here to avoid copy of queue_put */
g_queue_push_head (clutter_context->events_queue, event);
}
else
clutter_event_free (event);
}
}
/**
* clutter_x11_handle_event:
* @xevent: pointer to XEvent structure
*
* This function processes a single X event; it can be used to hook
* into external X11 event processing (for example, a GDK filter
* function).
*
* If clutter_x11_disable_event_retrieval() has been called, you must
* let this function process events to update Clutter's internal state.
*
* Return value: #ClutterX11FilterReturn. %CLUTTER_X11_FILTER_REMOVE
* indicates that Clutter has internally handled the event and the
* caller should do no further processing. %CLUTTER_X11_FILTER_CONTINUE
* indicates that Clutter is either not interested in the event,
* or has used the event to update internal state without taking
* any exclusive action. %CLUTTER_X11_FILTER_TRANSLATE will not
* occur.
*
* Since: 0.8
*/
ClutterX11FilterReturn
clutter_x11_handle_event (XEvent *xevent)
{
ClutterBackend *backend;
ClutterBackendX11Class *backend_x11_class;
ClutterEvent *event;
ClutterMainContext *clutter_context;
ClutterX11FilterReturn result;
gint spin = 1;
/* The return values here are someone approximate; we return
* CLUTTER_X11_FILTER_REMOVE if a clutter event is
* generated for the event. This mostly, but not entirely,
* corresponds to whether other event processing should be
* excluded. As long as the stage window is not shared with another
* toolkit it should be safe, and never return
* %CLUTTER_X11_FILTER_REMOVE when more processing is needed.
*/
result = CLUTTER_X11_FILTER_CONTINUE;
clutter_threads_enter ();
clutter_context = _clutter_context_get_default ();
backend = clutter_context->backend;
backend_x11_class = CLUTTER_BACKEND_X11_GET_CLASS (backend);
/* If the backend just observed the event and didn't want it
* removed it could return FALSE, so assume that a TRUE return
* means that our caller should also do no further processing. */
if (backend_x11_class->handle_event (CLUTTER_BACKEND_X11(backend), xevent))
return CLUTTER_X11_FILTER_REMOVE;
event = clutter_event_new (CLUTTER_NOTHING);
if (event_translate (backend, event, xevent))
{
/* push directly here to avoid copy of queue_put */
result = CLUTTER_X11_FILTER_REMOVE;
g_queue_push_head (clutter_context->events_queue, event);
}
else
{
clutter_event_free (event);
goto out;
}
/*
* Motion events can generate synthetic enter and leave events, so if we
* are processing a motion event, we need to spin the event loop at least
* two extra times to pump the enter/leave events through (otherwise they
* just get pushed down the queue and never processed).
*/
if (event->type == CLUTTER_MOTION)
spin += 2;
while (spin > 0 && (event = clutter_event_get ()))
{
/* forward the event into clutter for emission etc. */
clutter_do_event (event);
clutter_event_free (event);
--spin;
}
out:
clutter_threads_leave ();
return result;
}
static gboolean
clutter_event_prepare (GSource *source,
gint *timeout)
{
ClutterBackend *backend = ((ClutterEventSource *) source)->backend;
gboolean retval;
clutter_threads_enter ();
*timeout = -1;
retval = (clutter_events_pending () || check_xpending (backend));
clutter_threads_leave ();
return retval;
}
static gboolean
clutter_event_check (GSource *source)
{
ClutterEventSource *event_source = (ClutterEventSource *) source;
ClutterBackend *backend = event_source->backend;
gboolean retval;
clutter_threads_enter ();
if (event_source->event_poll_fd.revents & G_IO_IN)
retval = (clutter_events_pending () || check_xpending (backend));
else
retval = FALSE;
clutter_threads_leave ();
return retval;
}
static gboolean
clutter_event_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data)
{
ClutterBackend *backend = ((ClutterEventSource *) source)->backend;
ClutterEvent *event;
clutter_threads_enter ();
/* Grab the event(s), translate and figure out double click.
* The push onto queue (stack) if valid.
*/
events_queue (backend);
/* Pop an event off the queue if any */
event = clutter_event_get ();
if (event)
{
/* forward the event into clutter for emission etc. */
clutter_do_event (event);
clutter_event_free (event);
}
clutter_threads_leave ();
return TRUE;
}
/**
* clutter_x11_get_current_event_time:
*
* Retrieves the timestamp of the last X11 event processed by
* Clutter. This might be different from the timestamp returned
* by clutter_get_current_event_time(), as Clutter may synthesize
* or throttle events.
*
* Return value: a timestamp, in milliseconds
*
* Since: 1.0
*/
Time
clutter_x11_get_current_event_time (void)
{
ClutterBackend *backend = clutter_get_default_backend ();
return CLUTTER_BACKEND_X11 (backend)->last_event_time;
}
/**
* clutter_x11_event_get_key_group:
* @event: a #ClutterEvent of type %CLUTTER_KEY_PRESS or %CLUTTER_KEY_RELEASE
*
* Retrieves the group for the modifiers set in @event
*
* Return value: the group id
*
* Since: 1.4
*/
gint
clutter_x11_event_get_key_group (const ClutterEvent *event)
{
ClutterEventX11 *event_x11;
g_return_val_if_fail (event != NULL, 0);
g_return_val_if_fail (event->type == CLUTTER_KEY_PRESS ||
event->type == CLUTTER_KEY_RELEASE, 0);
event_x11 = _clutter_event_get_platform_data (event);
if (event_x11 == NULL)
return 0;
return event_x11->key_group;
}
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