Blending is quite expensive especially with software rendering.
In the case of Firefox on Wayland, it uses a ARGB8888 buffer but marks the
entire surface as opaque, so the alpha channel can be ignored.
CCBUG: 440386
When the last output gets disconnected, create a virtual output as a
placeholder until we have access to a physical output again. While
this placecholder never gets rendered to, with virtual outputs in
general that is possible (with gbm and qpainter atm) and can be done
for future use cases like wireless displays.
CCBUG: 420160
CCBUG: 438839
QImage is implicitly shared. However, methods such as QImage::bits() may
detach. In order to avoid the detach, one either needs make the image
const or use QImage::constBits() method.
Currently, the GLTexture class uses QImage::bits() all over the place.
It prevents implicit detaching by storing images in const variables. Such
code is fragile. Adding an intermediate (optional) conversion step may
result in odd performance regressions.
Currently, the shape region is not copied to the Deleted. If either
SurfaceItemX11 or SurfaceItemXwayland needs to build quads for a shaped
window, it won't be able to do so properly because the corresponding
x11 window is long time gone.
If the shape region changes before the window is unmapped, you may still
see visual artifacts. Unfortunately, the only way to fix that bug is to
switch to wayland.
BUG: 440001
BUG: 438458
BUG: 435378
https://invent.kde.org/plasma/kwin/-/merge_requests/1220
This reverts commit 44ad9437c4 because it
breaks build:
platforms/x11/common/eglonxbackend.cpp:224:66: error: cannot initialize a parameter of type 'EGLNativeWindowType' (aka 'unsigned long') with an rvalue of type 'xcb_window_t *' (aka 'unsigned int *')
surface = eglCreateWindowSurface(eglDisplay(), config(), &window, nullptr);
^~~~~~~
It is perfectly valid to have a case where an item exists but has no
window. During these times the item will never be rendered.
Rather than guard in updateOffscreenTexture, it's more economical to
disable the frame rendering in the first place. Especially as then it's
easy to extend to item visibility.
BUG: 440318
Makes it possible to apply the dpms settings per screen instead of
applying it to all of them, which is wrong at many levels.
Will be even more important with other effects like rotation.
If kwin is explicitly restarted (kwin_wayland --replace) we reset the
crash count so that you can run it more than 10 times without exiting to
the logout screen.
Resetting to 0 causes a issue as that triggers ksplash to be shown
again.
BUG: 434489
We inintially created the wrapper to be light so avoided the QtCore
dependency and did it all in C.
In hindsight changing requirements means we want to add several more
features in here. The first step is to port to a more readable language
and toolkit.
Currently, the entire screen will be repainted when using the qpainter
render backend. With this change, kwin will repaint only the dirty parts
on the screen.
A better alternative is to return the damage region in the beginFrame()
function. This way, the render backend can force full screen repaints or
indicate what parts of the buffer needs to be repainted (for buffer age)
