Currently if both box_a and box_b are non-empty but do not intersect,
this function does not set dest to an empty box. This contradicts the
doc comments and is surprising for users.
Color transforms are better suited than raw gamma tables, because:
- They don't need to get copied around: they are ref'counted.
- They can represent more color operations (will be useful for the
upcoming KMS color pipeline API, and for the Wayland color
management protocol).
Converting the LCMS2 transform to a 3D LUT early causes issues:
- It's a lossy process, the consumer will not be able to pick a
3D LUT size on their own.
- It requires unnecessary conversions and allocations: an intermediate
3D LUT is allocated, but the renderer already allocates one.
- It makes it harder to support arbitrary color transforms in the
renderer, because each type needs to be handled differently.
Instead, expose a function to evaluate a color transform, and use
that to build the 3D LUT in the renderer.
If a surface is mirrored on two outputs, we don't want to pick the
first output if the second has a higher refresh rate.
Also fixes duplicate frame/feedback events when a surface is added
to multiple scenes.
This lets the surface handler decide which output to send frame
callbacks from. The output_sample event already works this way.
Introduce wlr_scene_surface_send_frame_done() as a replacement for
wlr_scene_buffer_send_frame_done() when a compositor doesn't have
an output at hand.
If a surface appears on two outputs with the same intersection
area, or even if a surface appears on an output with a small
intersection area, we want to use the highest scale.
Fixes flip-flop when a surface is added to multiple scenes.
References: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3901
None active window might be interpreted from an X point of view as a
transient focus state, and is used by multiple X window managers when
a temporary focus change is in progress, or simply when grabbing the
keyboard.
From Wine side, we translate any active window change to the Win32
application, and handling None active window as an actual window
deactivation and focus loss creates spurious events and an undesired
feedback loop, as apps might react to it.
We still want to be able to detect actual focus loss under an XWayland
session, and having XWayland window manager focus an actual X window
instead will make the distinction possible.
