Jacek Caban : wow64win: Use in-place conversion in NtUserDrawText thunk.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 44b706f364b1f013c53e9638428cb675f989ecde
URL:    https://gitlab.winehq.org/wine/wine/-/commit/44b706f364b1f013c53e9638428cb67...

Author: Jacek Caban 
Date:   Wed Aug 17 14:46:05 2022 +0200

wow64win: Use in-place conversion in NtUserDrawText thunk.

---

dlls/wow64win/user.c | 19 ++++++++-----------
 1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/dlls/wow64win/user.c b/dlls/wow64win/user.c
index c8b799881b2..54079700340 100644
--- a/dlls/wow64win/user.c
+++ b/dlls/wow64win/user.c
@@ -824,22 +824,19 @@ static NTSTATUS WINAPI wow64_NtUserDrawText( void *arg, ULONG size )
     struct draw_text_params *params = arg;
     struct draw_text_params32 *params32;
     RECT *rect_ptr = params->ret_rect;
-    ULONG ret_len, len;
+    ULONG ret_len;
     void *ret_ptr;
     NTSTATUS ret;

-    len = (size - FIELD_OFFSET( struct draw_text_params, str )) / sizeof(WCHAR);
-    if (!(params32 = Wow64AllocateTemp( FIELD_OFFSET( struct draw_text_params32, str[len] ))))
-        return 0;
-
-    params32->hdc = HandleToUlong( params->hdc );
-    params32->count = params->count;
-    params32->rect = params->rect;
-    params32->ret_rect = 0;
+    params32 = (struct draw_text_params32 *)(params + 1) - 1;
     params32->flags = params->flags;
-    if (len) memcpy( params32->str, params->str, len * sizeof(WCHAR) );
+    params32->ret_rect = 0;
+    params32->rect = params->rect;
+    params32->count = params->count;
+    params32->hdc = HandleToUlong( params->hdc );

-    ret = Wow64KiUserCallbackDispatcher( NtUserDrawText, params, size, &ret_ptr, &ret_len );
+    ret = Wow64KiUserCallbackDispatcher( NtUserDrawText, params32,
+                                         size - sizeof(*params) + sizeof(*params32), &ret_ptr, &ret_len );
     if (ret_len == sizeof(RECT) && rect_ptr)
     {
         *rect_ptr = *(const RECT *)ret_ptr;