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fix: align global output offset with screen edges

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Previously, global output offset only moved outputs if they were in
negative coordinate space. Doing so guaranteed an output on the top-most
and left-most border of the screen. This commit offsets outputs to achieve
the same goal on outputs in positive coordinate space, which matches the
output placement of `xrandr`, a placement assumption made by Krita's
tablet tool logic.

The new definition of global output offset can be thought of as drawing
the smallest possible rectangle with contains every monitor, and moving
that bounding box to (0, 0).
This commit is contained in:
En-En 2026-02-03 14:30:17 +00:00 • committed by Supreeeme
parent 536bd32efc
commit 33c344fee5
4 changed files with 384 additions and 259 deletions
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5
ARCHITECTURE.md
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@ -34,13 +34,16 @@ The code for the X11 portion of satellite lives in `src/xstate`. Satellite must
as any other standard X11 window manager. This includes:
- Setting SubstructureRedirect and SubstructureNotify on the root window, to get notifications for when new windows are being created
- Follwing (most of) the [ICCCM](https://www.x.org/releases/X11R7.6/doc/xorg-docs/specs/ICCCM/icccm.html) and [EWMH](https://specifications.freedesktop.org/wm-spec/latest/) specs
- Following (most of) the [ICCCM](https://www.x.org/releases/X11R7.6/doc/xorg-docs/specs/ICCCM/icccm.html) and [EWMH](https://specifications.freedesktop.org/wm-spec/latest/) specs
In addition, satellite must do some other things that a normal X11 window manager wouldn't - but a compositor integrating
Xwayland would - such as synchronize X11 and Wayland selections. This is explained further in the Wayland server section.
The way that satellite manages windows from the X11 point of view is as follows:
- All monitors maintain their relative positions to one another. Their absolute position is such that
the top-most monitor's top edge is on the X-axis and the left-most monitor's left edge is on the Y-axis.
- All monitors are on non-negative coordinates with no gaps between the screen and any monitor, matching what `xrandr` does.
- All toplevels on a monitor are positioned at 0x0 on that monitor. So if you have one monitor at 0x0,
all the windows are located at 0x0. If you have a monitor at 300x600, all the windows on that monitor are at 300x600.
- This offset is needed because all monitors rest in the same coordinate plane in X11, so missing this offset would