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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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14
client/src/main.c
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@@ -1076,6 +1076,7 @@ int main_cursorThread(void * unused)
const bool wasRendered = g_cursor.guest.visible &&
(g_cursor.draw || !g_params.useSpiceInput);
bool hotspotChanged = false;
if (pointer.flags & LG_TRANSPORT_POINTER_VISIBLE_VALID)
g_cursor.guest.visible =
@@ -1094,8 +1095,8 @@ int main_cursorThread(void * unused)
continue;
}
g_cursor.guest.hx = pointer.hx;
g_cursor.guest.hy = pointer.hy;
hotspotChanged =
g_cursor.guest.hx != pointer.hx || g_cursor.guest.hy != pointer.hy;
if (!RENDERER(onMouseShape, cursorType, pointer.width, pointer.height,
pointer.pitch, pointer.shape))
{
@@ -1103,6 +1104,8 @@ int main_cursorThread(void * unused)
g_state.transportOps->releasePointer(g_state.transport, &pointer);
continue;
}
g_cursor.guest.hx = pointer.hx;
g_cursor.guest.hy = pointer.hy;
}
if ((pointer.flags & LG_TRANSPORT_POINTER_COLOR_TRANSFORM) &&
@@ -1132,9 +1135,14 @@ int main_cursorThread(void * unused)
core_alignToGuest();
app_resyncMouseBasic();
}
core_handleGuestMouseUpdate();
}
if (hotspotChanged)
app_resyncMouseBasic();
if ((pointer.flags & LG_TRANSPORT_POINTER_POSITION) || hotspotChanged)
core_handleGuestMouseUpdate();
app_updateMouseState();
g_cursor.redraw = false;
RENDERER(onMouseEvent,