wined3d: Use the texture dimension helpers in wined3d_device_create_cursor_texture().

dlls/wined3d/device.c

@@ -4282,6 +4282,7 @@ void CDECL wined3d_device_set_depth_stencil_view(struct wined3d_device *device,
 static struct wined3d_texture *wined3d_device_create_cursor_texture(struct wined3d_device *device,
         struct wined3d_texture *cursor_image, unsigned int sub_resource_idx)
 {
+    unsigned int texture_level = sub_resource_idx % cursor_image->level_count;
     struct wined3d_sub_resource_data data;
     struct wined3d_resource_desc desc;
     struct wined3d_map_desc map_desc;
@@ -4304,8 +4305,8 @@ static struct wined3d_texture *wined3d_device_create_cursor_texture(struct wined
     desc.multisample_quality = 0;
     desc.usage = WINED3DUSAGE_DYNAMIC;
     desc.pool = WINED3D_POOL_DEFAULT;
-    desc.width = cursor_image->sub_resources[sub_resource_idx].resource->width;
-    desc.height = cursor_image->sub_resources[sub_resource_idx].resource->height;
+    desc.width = wined3d_texture_get_level_width(cursor_image, texture_level);
+    desc.height = wined3d_texture_get_level_height(cursor_image, texture_level);
     desc.depth = 1;
     desc.size = 0;