The code that restacks X11 windows at the end first tracks any
old windows we know about, and then handles any windows created.
It starts when it ended, and then walks forwards and then
back looking for the first X11 window it doesn't know about.
However, when there aren't any X11 windows, it flies off the end
of the array and starts looking through random memory.
When it finds the X11 window, it then goes through and then tries
to restack the remaining windows according to how we've sorted
them.
Unfortunately, META_WINDOW_CLIENT_TYPE_X11 is 0, which is quite
common in random memory we have lying around, so we enter that
path and then just crash.
Fix the buffer overrun by adding the proper bounds check to the
search.
You can easily reproduce this by opening a menu while bloatpad
is full-screen. Why it only crashes when full-screen and not
when a standard window, I have no idea.
For clarity, rename meta_window_get_outer_rect() to match terminology
we use elsewhere. The old function is left as a deprecated
compatibility wrapper.
Since this is stored in an array full of data that will be copied
around, we can't rely on pointer addresses for every item in a stack
not changing.
I don't see any reason that we even have a weak pointer, either.
This code looks safe to me without it.
This breaks down the assumptions in stack-tracker.c and stack.c that
Mutter is only stacking X windows.
The stack tracker now tracks windows using a MetaStackWindow structure
which is a union with a type member so that X windows can be
distinguished from Wayland windows.
Some notable changes are:
Queued stack tracker operations that affect Wayland windows will not be
associated with an X serial number.
If an operation only affects a Wayland window and there are no queued
stack tracker operations ("unvalidated predictions") then the operation
is applied immediately since there is no server involved with changing
the stacking for Wayland windows.
The stack tracker can no longer respond to X events by turning them into
stack operations and discarding the predicted operations made prior to
that event because operations based on X events don't know anything
about the stacking of Wayland windows.
Instead of discarding old predictions the new approach is to trust the
predictions but whenever we receive an event from the server that
affects stacking we cross-reference with the predicted stack and check
for consistency. So e.g. if we have an event that says ADD window A then
we apply the predictions (up to the serial for that event) and verify
the predicted state includes a window A. Similarly if an event says
RAISE_ABOVE(B, C) we can apply the predictions (up to the serial for
that event) and verify that window B is above C.
If we ever receive spurious stacking events (with a serial older than we
would expect) or find an inconsistency (some things aren't possible to
predict from the compositor) then we hit a re-synchronization code-path
that will query the X server for the full stacking order and then use
that stack to walk through our combined stack and force the X windows to
match the just queried stack but avoiding disrupting the relative
stacking of Wayland windows. This will be relatively expensive but
shouldn't be hit for compositor initiated restacking operations where
our predictions should be accurate.
The code in core/stack.c that deals with synchronizing the window stack
with the X server had to be updated quite heavily. In general the patch
avoids changing the fundamental approach being used but most of the code
did need some amount of re-factoring to consider what re-stacking
operations actually involve X or not and when we need to restack X
windows we sometimes need to search for a suitable X sibling to restack
relative too since the closest siblings may be Wayland windows.
Mutter previously defined display->focus_window as the window that the
server says is focused, but kept display->expected_focus_window to
indicate the window that we have requested to be focused. But it turns
out that "expected_focus_window" was almost always what we wanted.
Make MetaDisplay do a better job of tracking focus-related requests
and events, and change display->focus_window to be our best guess of
the "currently" focused window (ie, the window that will be focused at
the time when the server processes the next request we send it).
https://bugzilla.gnome.org/show_bug.cgi?id=647706
Trying to track the fullscreen status outside of Mutter, as GNOME Shell
was doing previously, was very prone to errors, because Mutter has a
very tricky definition of when a window is set to be fullscreen and
*actually* acting like a fullscreen window.
* Add meta_screen_get_monitor_in_fullscreen() and an
::in-fullscreen-changed signal. This allows an application to
track when there are fullscreen windows on a monitor.
* Do the computation of fullscreen status in a "later" function that
runs after showing, so we properly take focus into account.
* To get ordering of different phases right, add more values
to MetaLaterType.
* Add auto-minimization, similar to what was added to GNOME Shell
earlier in this cycle - if a window is set to be fullscreen, but
not actually fullscreen, minimize.
https://bugzilla.gnome.org/show_bug.cgi?id=649748
It is impossible to switch to other windows when keep-on-top is set
for maximized windows; given that keep-on-top is only ever useful
to keep a window visible while focusing a different window, the
current behavior is pointless. So ignore keep-on-top while a window
is maximized.
https://bugzilla.gnome.org/show_bug.cgi?id=673581
When mutter recognizes a full-screen window, it tries to raise it to the top
of the stack. Unfortunately, a recent rewrite of the stack code didn't do
well with raising a window to the top of the stack if the stack wasn't in
a consistent state -- it would crash. Ensure that the stack is in a consistent
state at the top of meta_stack_raise/meta_stack_lower.
https://bugzilla.redhat.com/show_bug.cgi?id=806437https://bugzilla.gnome.org/show_bug.cgi?id=672797
Returns the matching tiled window. This is the topmost tiled window in a
complementary tile mode that is:
- on the same monitor;
- on the same workspace;
- spanning the remaining monitor width;
- there is no 3rd window stacked between both tiled windows that's
partially visible in the common edge.
https://bugzilla.gnome.org/show_bug.cgi?id=643075
If mutter is going to be a "real" library, then it should install its
includes so that users can do
#include <meta/display.h>
rather than
#include <display.h>
So rename the includedir accordingly, move src/include to src/meta,
and fix up all internal references.
There were a handful of header files in src/include that were not
installed; this appears to have been part of a plan to keep core/,
ui/, and compositor/ from looking at each others' private includes,
but that wasn't really working anyway. So move all non-installed
headers back into core/ or ui/.
https://bugzilla.gnome.org/show_bug.cgi?id=643959
While the Meego developers agreed to switching mutter to GTK+-3.0
unconditionally a while ago, Canonical used a GTK+-2.0 build for their
Unity project. As Canonical now announced a switch to compiz as their
window manager, there is no longer a reason to maintain GTK+-2.0
compatibility.
https://bugzilla.gnome.org/show_bug.cgi?id=633133
Putting hidden windows in the desktop layer is pointless - in
the desktop layer isn't necessary below all visible windows,
and we are hiding the windows by other means. And the movement
isn't reliable because nothing sets stack->needs_relayer, so
windows can get stuck in the desktop layer after being
rehidden.
http://bugzilla.gnome.org/show_bug.cgi?id=587251
With MetaStackTracker, it's no longer necessary to XQueryTree to
get a reasonably-up-to-date view of the server stacking order.
Add some comments explaining unclear aspects of
raise_window_relative_to_managed_windows() and with future possible
improvements.
http://bugzilla.gnome.org/show_bug.cgi?id=585984
Don't add override-redirect windows to MetaStack; we shouldn't
be restacking them.
Since we *aren't* stacking the override-redirect windows, we need to
be careful that to ignore them when looking for the top managed
window.
http://bugzilla.gnome.org/show_bug.cgi?id=585984
In order to properly track the stacking order for override-redirect
windows, move meta_compositor_sync_stack() call into MetaStackTracker.
In the new location, we sync the stack as a before-redraw idle function,
rather then using the freeze-thaw facilities of MetaStack. This is
simpler, and also properly compresses multiple stack changes on
notifications received from the X server.
http://bugzilla.gnome.org/show_bug.cgi?id=585984
Wedging override-redirect windows into the constraint code in stack.c
results in Mutter getting confused about the stacking order of
these windows with respect to other windows, and may also in some
cases cause Mutter to restack override-redirect windows.
core/stack-tracker.c core/stack-tracker.h: MetaStackTracker - combine
events received from the X server with local changes we have made
to come up with the best possible idea of what the stacking order
is at any one point in time.
core/screen.c core/screen-private.h: Create a MetaStackTracker for
the screen.
core/display.c: Feed relevant events to MetaStackTracker
core/frame.c core/screen.c core/stack.c: When we make changes to the
stacking order or add windows, record those changes immediatley
in MetaStackTracker so we have the information without waiting
for a round-trip.
include/ui.h ui/ui.c: meta_ui_create_frame_window add a return value
for the X request serial used to create the window.
http://bugzilla.gnome.org/show_bug.cgi?id=585984
Expose restacking and a window's stack layer to allow a compositor
to insert elements into the window stack in the right location.
(See Bug 571827 – hide panel when screensaver is active)
src/core/stack.h src/include/common.h: Move MetaStackLayer to
a public header.
src/core/screen.c src/core/screen-private.h src/core/stack.c:
Add a ::restacked signal emitted after we finish restracking.
src/core/window.h src/include/window.h: Add meta_window_get_layer()
The metacity core is now directly aware of override redirect windows.
- They get MetaWindows like normal windows, so mutter no longer need to special
case them. The net wm types applicable to override redirects are also
recognised.
- The original positioning/stacking semantics of metacity with respect to OR
windows are maintained, but now it's easier to synchronize the stacking
between the core and mutter.
- mutter no longer needs to manualy track UnmapNotify, MapNotify,
ReparentNotify, CreateNotify and DestroyNotify events; instead map, unmap,
add and remove events can now be consistently delivered via the
MetaCompositor callbacks.
We can't easily use a metacity layer to hide windows as that means we
loose our original stacking position. (Metacity's stack positions are
only valid within a single layer) We now have a "guard window" per
screen that is a fullscreen override redirect that is lowered to the
bottom of the stack. Hidden windows now remain in their original layer
so the stacking position remains valid, but all hidden windows get
XRestacked under the guard window.
A new compositor hook is also added to inform it when a window becomes
hidden/unhidded, this lets us map/unmap the corresponding actor.
missing files in preview commit (TODO: rebase -i and squash this later)
ClutterActors for hidden windows (such windows on different than active
workspaces and windows that are minimized) are available, and reflect the
actual state of the window. This is intended for use in task-switchers etc.
This feature is disabled by default (due to increased demand on resources),
and can be enabled through the metacity/general/live_hidden_windows gconf key.
A trivial sample window switcher is included in the scratch plugin (activated
by clicking on the slide out panel).
2008-06-29 Thomas Thurman <tthurman@gnome.org>
* src/core/stack.c (stack_sync_to_server): lose meta prefix
since it's static.
* src/core/stack.c (meta_stack_remove, stack_do_window_deletions):
replace our own cast with glib macro designed to do the same thing
svn path=/trunk/; revision=3773
2008-06-26 Thomas Thurman <tthurman@gnome.org>
Refactor so the long scary stack functions are less long and scary:
* stack.c (stack_ensure_sorted): the five parts of this long function
broken out into the new functions stack_do_window_deletions,
stack_do_window_additions, stack_do_relayer, stack_do_constrain
(which was already separate: see next) and stack_do_resort.
* stack.c (constrain_stacking): renamed to stack_do_constrain.
* stack.c (stack_ignore_sorted): lose meta prefix since it's static.
svn path=/trunk/; revision=3768
2008-05-19 Iain Holmes <iain@gnome.org>
* src/include/frame.h
* src/include/display.h
* src/include/xprops.h
* src/include/compositor.h
* src/include/types.h
* src/include/window.h
* src/include/errors.h
* src/include/screen.h: New basic public API for compositor.
* src/compositor/*: Separate the compositor out into its own
separate
directory and set it up for backends. Initial XRender backend.
* src/core/compositor.[ch]: Remove
* src/core/frame.h
* src/core/screen.h
* src/core/display.h
* src/core/window.h: Rename to -private.h so as not to clash
with the
new files in include
* src/core/delete.c
* src/core/workspace.h
* src/core/stack.[ch]
* src/core/keybindings.[ch]
* src/core/errors.c
* src/core/effects.[ch]
* src/core/core.c
* src/core/group.h
* src/core/edge-resistance.[ch]
* src/core/window-props.[ch]
* src/core/constraints.h
* src/core/bell.[ch]
* src/core/iconcache.h
* src/core/session.[ch]
* src/core/main.c
* src/core/place.h
* src/core/xprops.c
* src/ui/tabpopup.c: Use the new -private headers
* src/core/display.c
* src/core/frame.c
* src/core/window.c
* src/core/screen.c: Add the API functions required by the
compositor
* src/Makefile.am: Relocate the new files
svn path=/trunk/; revision=3715
2008-05-02 Thomas Thurman <tthurman@gnome.org>
All information should live in exactly one place. This means
that the list of atoms should not be replicated anywhere.
Therefore, we include it via x-macros. Closes#530843.
* src/core/atomnames.h: added list of atom names
* src/Makefile.am: added reference to new file
* src/core/display.h
* src/core/display.c (twice)
* src/core/screen.c: #included atomnames.h instead of having
an enormous list of atoms
* src/core/group-props.c
* src/core/window.c
* src/core/compositor.c
* src/core/window-props.c
* src/core/delete.c
* src/core/workspace.c
* src/core/stack.c
* src/core/keybindings.c
* src/core/iconcache.c
* src/core/group.c
* src/core/xprops.c: changed to new, simpler identifiers
for atoms
svn path=/trunk/; revision=3702
2007-12-19 Havoc Pennington <hp@redhat.com>
* src/ui, src/core, src/include: sort source files into these
directories according to which part of the WM they are supposed to
be in. In an eventual plan, we should also create
src/compositor/render, src/compositor/fallback and move some of
the compositor stuff into that.
* autogen.sh: require a newer automake, so we don't have to use
a recursive build
* src/ui/tabpopup.c: put in a hack to make the build temporarily
work, want to commit the large rearrangement before fixing this
not to include workspace.h or frame.h
* src/core/iconcache.c (meta_read_icons): temporarily break this
to get the build to work, want to commit the large rearrangement
before fixing this file not to include theme.h
svn path=/trunk/; revision=3491
