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[client] cursor: improve Wayland hotspot alignment

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Center the Wayland diagnostic cursor on its actual pointer hotspot and
preserve it while cursor themes are reloaded for output-scale changes.

Round fractional guest positions to the nearest logical pixel instead of
biasing synchronization toward the top-left corner.

Resynchronize the hardware pointer when a cursor shape changes its
hotspot. Only perform the extra synchronization when the hotspot
actually changes, and update the basic-mode projection at the same time.
This commit is contained in:
Geoffrey McRae
2026-08-06 20:47:21 +10:00
parent e4874ee32d
commit 5ab10614f2
3 changed files with 19 additions and 5 deletions
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7
client/displayservers/Wayland/cursor.c
View File

@@ -157,7 +157,8 @@ bool waylandCursorInit(void)
wlWm.cursorSquareBuffer = createSquareCursorBuffer();
if (wlWm.cursorSquareBuffer)
{
wlWm.cursors[LG_POINTER_SQUARE] = wl_compositor_create_surface(wlWm.compositor);
wlWm.cursors[LG_POINTER_SQUARE] = wl_compositor_create_surface(wlWm.compositor);
wlWm.cursorHot[LG_POINTER_SQUARE] = (struct Point) { 2, 2 };
wl_surface_attach(wlWm.cursors[LG_POINTER_SQUARE], wlWm.cursorSquareBuffer, 0, 0);
wl_surface_commit(wlWm.cursors[LG_POINTER_SQUARE]);
}
@@ -213,6 +214,10 @@ void waylandCursorScaleChange(void)
memcpy(old, wlWm.cursors, sizeof(old));
memset(wlWm.cursors, 0, sizeof(wlWm.cursors));
/* the diagnostic cursor is not part of the cursor theme */
wlWm.cursors[LG_POINTER_SQUARE] = old[LG_POINTER_SQUARE];
old[LG_POINTER_SQUARE] = NULL;
if (wlWm.cursorTheme)
wl_cursor_theme_destroy(wlWm.cursorTheme);

3
client/displayservers/Wayland/input.c
View File

@@ -21,6 +21,7 @@
#include "wayland.h"
#include <errno.h>
#include <math.h>
#include <stdbool.h>
#include <string.h>
#include <sys/mman.h>
@@ -1027,5 +1028,5 @@ void waylandGuestPointerUpdated(double x, double y, double localX, double localY
MTRACE("guest warp guest=%.3f,%.3f local=%.3f,%.3f",
x, y, localX, localY);
waylandWarpPointer((int) localX, (int) localY, false);
waylandWarpPointer((int) round(localX), (int) round(localY), false);
}