As explained in [1], WL_SURFACE_ID is racy because wayland aggressively
reuses object ids. The xwayland-shell-v1 protocol intends to fix that by
two things:
* associating a serial number with each X11 window. This is to avoid
potential XID reuse
* referring to the wayland surface by the wl_surface rather than
specifying an object id
Unfortunately, we will have to maintain both legacy WL_SURFACE_ID and
WL_SURFACE_SERIAL for quiet some time until most instances of Xwayland
support the xwayland-shell-v1 protocol [2].
[1] https://gitlab.freedesktop.org/xorg/xserver/-/issues/1157
[2] https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/163
At the moment, the keyboard interception code in the effects system
relies on Qt code processing key events. However, since QDesktopWidget
is removed in Qt 6, this is a blocker for Qt 6 port.
This change ports the X11 backend to private xkb keymap as indicates in
the todo comment. It allows us to drop the last QDesktopWidget usage.
This enables again the crossfade between the old window picture and the new one in the maximize and morphingpopup effects.
It does that with the OffScreenEffect redirect() feature.
BUG:439689
BUG:435423
With fractional scaling integer based logical geometry may not match
device pixels. Once we have a floating point base we can fix that. This
also is
important for our X11 scale override, with a scale of 2 we could
get logical sizes with halves.
We already have all input being floating point, this doubles down on it
for all remaining geometry.
- Outputs remain integer to ensure that any screen on the right remains
aligned.
- Placement also remains integer based for now.
- Repainting is untouched as we always expand outwards
(QRectF::toAdjustedRect().
- Decoration is untouched for now
- Rules are integer in the config, but floating in the adjusting/API
This should also be fine.
At some point we'll add a method to snap to the device pixel
grid. Effectively `round(value * dpr) / dpr` though right now things
mostly work.
This also gets rid of a lot of hacks for QRect right and bottom which
are very
confusing.
Parts to watch out in the port are:
QRectF::contains now includes edges
QRectF::right and bottom are now sane so previous hacks have to be
removed
QRectF(QPoint, QPoint) behaves differently for the same reason
QRectF::center too
In test results some adjusted values which are the result of
QRect.center because using QRectF's center should behave the same to the
user.
Anything in xcb_ structs are always in X local, all member variables
aside from buffers are in kwin local space.
This patch ignores a few paths that are not relevant on wayland.
The Workspace has two stacks - one with managed windows and deleted
windows, the other includes windows from the first stack + override
redirect windows.
This change merges both stacks. It has several benefits - we will be
able to move window elevation stuff to Workspace and streamline the
scene stuff, for example it will be possible to have a root item.
Another advantage is that unmanaged windows will have
Window::stackingOrder() property set, which can be useful in the future
in qml effects or (qtquick scene if we push harder in that front).
Another advantage is that kwin will make less X11 calls when restacking
managed windows.
With this, the WindowItem will know whether it's actually visible. As
the result, if a native wayland window has been minimized, kwin won't
try to schedule a new frame if just a frame callback has been committed.
EffectWindow::enablePainting() and EffectWindow::disablePainting() act
as a stone in the shoe. They have the final say whether the given window
is visible and they are invoked too late in the rendering process.
WindowItem needs to know whether the window is visible in advance,
before compositing starts.
This change replaces EffectWindow::enablePainting() and
EffectWindow::disablePainting() with EffectWindow::refVisible() and
EffectWindow::unrefVisible(). If an effect calls the refVisible()
function, the window will be kept visible regardless of its state. It
should be called when a window is minimized or closed, etc. If an effect
doesn't want to paint a window, it should not call effects->paintWindow().
EffectWindow::refVisible() doesn't replace EffectWindow::refWindow() but
supplements it. refVisible() only ensures that a window will be kept
visible while refWindow() ensures that the window won't be destroyed
until the effect is done with it.
It helps to contextualise the method as it's using several x11-isms,
some of them possible ot abstract.
In any case, the method is only called with X11Window and it's the only
case where it makes sense doing so.
This makes KWin switch to in-tree copy of KWaylandServer codebase.
KWaylandServer namespace has been left as is. It will be addressed later
by renaming classes in order to fit in the KWin namespace.
Currently, if geometry updates are blocked, the Toplevel.output property
won't be updated. On the other hand, it's reasonable to use the output
property instead of manually looking up the output in window management
code, e.g. Workspace::clientArea().
In other words, using the Toplevel.output property is like walking on a
mine field, things can blow up. You can't use Toplevel.output even if it
makes perfect sense.
This change ensures that Toplevel.output property is always kept in sync
with the frame geometry. Unfortunately, this means that the output
property no longer can be updated when the frameGeometryChanged() signal
is emitted. It has to be done in moveResizeInternal() method.
The .clang-format file is based on the one in ECM except the following
style options:
- AlwaysBreakBeforeMultilineStrings
- BinPackArguments
- BinPackParameters
- ColumnLimit
- BreakBeforeBraces
- KeepEmptyLinesAtTheStartOfBlocks
This ensures that we get a warning if the config header is not included
instead of compiling the code as if it was disabled. Interestingly, some
checks already used #if KWIN_BUILD_*, so those were generating -Wundef
warnings when the feature is disabled. Commit 886173cab assumed that all
those features were already 01, so this unbreaks the build if any of the
features is disabled.
Fixes: 886173cab ("Reduce ifdefs in Workspace::supportInformation()")
With connection(), we will look up the x11 connection property on
kwinApp() object, which is less efficient than just calling a method on
the app object.
Since 4881dd63 replaced the double click timer for OffscreenQuickView
with a time check, we need to make sure the timestamp from
XInput/libinput is passed on to the actual QMouseEvent.
BUG: 448477
The gravity concept is a generic way to describe how a window must be
positioned during interactive resize. It works both when resizing the
window using a pointer or touch.
When moving or resizing a window on X11, the window based screen edges
won't receive pointer input, so handleInteractiveMoveResize() explicitly
pokes the ScreenEdges to check if there's any approached screen edge.
On Wayland, it's not an issue. This change moves X11-specific code to
X11Client to avoid checking screen edges twice.
KWin handles several types of pointing input devices, e.g. mice,
tablets, etc.
As is, enterEvent and leaveEvent are very ambiguous. This change
prepends "pointer" to those methods to make it explicit that they handle
pointer enter/leave events.
Xwayland will re-create the wl_surface object if the X11 window is
unmapped and mapped. That, and the fact that the order in which the
WL_SURFACE_ID client message event is received and the wl_surface object
is created is undefined can cause the following bug:
* WL_SURFACE_ID is received
* the old wl_surface object is destroyed, m_surfaceId is reset to 0
* new wl_surface is created but because m_surfaceId is 0, it won't be
associated with the x11 window
This change ensures that kwin will associate the wl_surface with x11
window by making it not reset cached surface id when the old wl_surface
is destroyed.
However, we cannot leave m_surfaceId as is because wayland aggressively
re-uses object ids so kwin can associate wrong surface with x11 window.
To prevent that, this change also makes Toplevel::setSurface() reset
cached surface id.
CCBUG: 442936
CCBUG: 426069
The main idea behind _NET_WM_FRAME_OVERLAP is to extend the borders of
the server-side decoration so the application can draw on top of it. It
was inspired by similar feature in Windows.
However, _NET_WM_FRAME_OVERLAP is basically unused. Neither GTK nor Qt
support it and I have never seen any application that uses it.
At the moment, kwin is the only compositing window manager that supports
_NET_WM_FRAME_OVERLAP. Neither mutter nor compiz nor compton and so on
support it.
Since _NET_WM_FRAME_OVERLAP is practically unused, there's no point for
keeping supporting it.
This change shouldn't affect any existing app as _NET_WM_FRAME_OVERLAP
atom is not listed in _NET_SUPPORTED.
It is error-prone to have multiple sources for the same data. If the
base implementation (Compositor::compositing()) changes, other helpers
can get out of sync.
Window management features were written with synchronous geometry
updates in mind. Currently, this poses a big problem on Wayland because
geometry updates are done in asynchronous fashion there.
At the moment, geometry is updated in a so called pseudo-asynchronous
fashion, meaning that the frame geometry will be reset to the old value
once geometry updates are unblocked. The main drawback of this approach
is that it is too error prone, the data flow is hard to comprehend, etc.
It is worth noting that there is already a machinery to perform async
geometry which is used during interactive move/resize operations.
This change extends the move/resize geometry usage beyond interactive
move/resize to make asynchronous geometry updates less error prone and
easier to comprehend.
With the proposed solution, all geometry updates must be done on the
move/resize geometry first. After that, the new geometry is passed on to
the Client-specific implementation of moveResizeInternal().
To be more specific, the frameGeometry() returns the current frame
geometry, it is primarily useful only to the scene. If you want to move
or resize a window, you need to use moveResizeGeometry() because it
corresponds to the last requested frame geometry.
It is worth noting that the moveResizeGeometry() returns the desired
bounding geometry. The client may commit the xdg_toplevel surface with a
slightly smaller window geometry, for example to enforce a specific
aspect ratio. The client is not allowed to resize beyond the size as
indicated in moveResizeGeometry().
The data flow is very simple: moveResize() updates the move/resize
geometry and calls the client-specific implementation of the
moveResizeInternal() method. Based on whether a configure event is
needed, moveResizeInternal() will update the frameGeometry() either
immediately or after the client commits a new buffer.
Unfortunately, both the compositor and xdg-shell clients try to update
the window geometry. It means that it's possible to have conflicts
between the two. With this change, the compositor's move resize geometry
will be synced only if there are no pending configure events, meaning
that the user doesn't try to resize the window.
This is to improve code readability and make it easier to differentiate
between methods that are used during interactive move-resize and normal
move-resize methods in the future.
This makes the implementation of the buffer geometry consistent with the
frame geometry and the client geometry and removes a virtual method call
from a few hot paths.
Vlad Zahorodnii
Xaver Hugl
Marco Martin
David Edmundson
Aleix Pol
Nils Fenner
Alex Richardson
Volker Krause
Kai Uwe Broulik
Severin von Wnuck
Ahmad Samir