[PATCH 0/1] MR7513: winewayland: Treat fully transparent cursors as hidden.

[Alexandros Frantzis (＠afrantzis)]

SDL 2.0.18 and newer (including SDL 3) set a fully transparent cursor
object when hiding the cursor (instead of using a NULL cursor handle).
Detect this case and treat it as a request to hide the cursor, to make
our locking/relative-motion heuristics work.

---

Here is the SDL code:
https://github.com/libsdl-org/SDL/blob/e20e27e1fbecf8c351b0cc2505567347a3b02...
added in https://github.com/libsdl-org/SDL/commit/8fee82d1fd9d8875cca7f8bfc577c60d12a... to improve RDP support.

[PATCH 1/1] winewayland: Treat fully transparent cursors as hidden.

[Alexandros Frantzis]

From: Alexandros Frantzis

SDL 2.0.18 and newer (including SDL 3) set a fully transparent cursor
object when hiding the cursor (instead of using a NULL cursor handle).
Detect this case and treat it as a request to hide the cursor, to make
our locking/relative-motion heuristics work.
---
 dlls/winewayland.drv/wayland_pointer.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/dlls/winewayland.drv/wayland_pointer.c b/dlls/winewayland.drv/wayland_pointer.c
index e2b31e02011..17139c47b13 100644
--- a/dlls/winewayland.drv/wayland_pointer.c
+++ b/dlls/winewayland.drv/wayland_pointer.c
@@ -494,6 +494,17 @@ static BOOL get_icon_info(HICON handle, ICONINFOEXW *ret)
     return TRUE;
 }

+static BOOL cursor_buffer_is_transparent(struct wayland_shm_buffer *shm_buffer)
+{
+    uint32_t *pixel = shm_buffer->map_data;
+    uint32_t *end = pixel + shm_buffer->map_size / WINEWAYLAND_BYTES_PER_PIXEL;
+
+    for (; pixel < end; ++pixel)
+        if ((*pixel & 0xff000000) != 0) return FALSE;
+
+    return TRUE;
+}
+
 static void wayland_pointer_update_cursor_buffer(HCURSOR hcursor, double scale)
 {
     struct wayland_cursor *cursor = &process_wayland.pointer.cursor;
@@ -538,6 +549,9 @@ static void wayland_pointer_update_cursor_buffer(HCURSOR hcursor, double scale)
         goto clear_cursor;
     }

+    if (cursor_buffer_is_transparent(cursor->shm_buffer))
+        goto clear_cursor;
+
     /* Make sure the hotspot is valid. */
     if (cursor->hotspot_x >= cursor->shm_buffer->width ||
         cursor->hotspot_y >= cursor->shm_buffer->height)