From d2372d60f0976b2e7a9740491eaebe38b828b690 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9mi=20Bernon?= <rbernon@codeweavers.com>
Date: Tue, 4 Jun 2024 11:29:20 +0200
Subject: [PATCH] win32u: Get rid of move_window_bits_parent, using
 move_window_bits.

---
 dlls/win32u/dce.c            | 47 +++++++-----------------------------
 dlls/win32u/win32u_private.h |  2 --
 dlls/win32u/window.c         |  2 +-
 3 files changed, 10 insertions(+), 41 deletions(-)

diff --git a/dlls/win32u/dce.c b/dlls/win32u/dce.c
index 47c624cacc6..57a3ae59eff 100644
--- a/dlls/win32u/dce.c
+++ b/dlls/win32u/dce.c
@@ -1189,26 +1189,10 @@ static BOOL send_erase( HWND hwnd, UINT flags, HRGN client_rgn,
     return need_erase;
 }
 
-/***********************************************************************
- *           copy_bits_from_surface
- *
- * Copy bits from a window surface; helper for move_window_bits and move_window_bits_parent.
- */
-static void copy_bits_from_surface( HWND hwnd, const RECT *dst, const RECT *src )
-{
-    UINT flags = UPDATE_NOCHILDREN | UPDATE_CLIPCHILDREN;
-    HRGN rgn = get_update_region( hwnd, &flags, NULL );
-    HDC hdc = NtUserGetDCEx( hwnd, rgn, DCX_CACHE | DCX_WINDOW | DCX_EXCLUDERGN );
-
-    NtGdiStretchBlt( hdc, dst->left, dst->top, dst->right - dst->left, dst->bottom - dst->top,
-                     hdc, src->left, src->top, src->right - src->left, src->bottom - src->top, SRCCOPY, 0 );
-    NtUserReleaseDC( hwnd, hdc );
-}
-
 /***********************************************************************
  *           move_window_bits
  *
- * Move the window bits when a window is resized.
+ * Move the window bits when a window is resized, or moved within a parent window.
  */
 void move_window_bits( HWND hwnd, const RECT *visible_rect, const RECT *old_visible_rect,
                        const RECT *window_rect, const RECT *valid_rects )
@@ -1219,10 +1203,17 @@ void move_window_bits( HWND hwnd, const RECT *visible_rect, const RECT *old_visi
     if (src.left - old_visible_rect->left != dst.left - visible_rect->left ||
         src.top - old_visible_rect->top != dst.top - visible_rect->top)
     {
+        UINT flags = UPDATE_NOCHILDREN | UPDATE_CLIPCHILDREN;
+        HRGN rgn = get_update_region( hwnd, &flags, NULL );
+        HDC hdc = NtUserGetDCEx( hwnd, rgn, DCX_CACHE | DCX_WINDOW | DCX_EXCLUDERGN );
+
         TRACE( "copying %s -> %s\n", wine_dbgstr_rect( &src ), wine_dbgstr_rect( &dst ));
         OffsetRect( &src, -window_rect->left, -window_rect->top );
         OffsetRect( &dst, -window_rect->left, -window_rect->top );
-        copy_bits_from_surface( hwnd, &dst, &src );
+
+        NtGdiStretchBlt( hdc, dst.left, dst.top, dst.right - dst.left, dst.bottom - dst.top,
+                         hdc, src.left, src.top, src.right - src.left, src.bottom - src.top, SRCCOPY, 0 );
+        NtUserReleaseDC( hwnd, hdc );
     }
 }
 
@@ -1260,26 +1251,6 @@ void move_window_bits_surface( HWND hwnd, const RECT *window_rect, struct window
 }
 
 
-/***********************************************************************
- *           move_window_bits_parent
- *
- * Move the window bits in the parent surface when a child is moved.
- */
-void move_window_bits_parent( HWND hwnd, const RECT *window_rect, const RECT *valid_rects )
-{
-    RECT dst = valid_rects[0];
-    RECT src = valid_rects[1];
-
-    if (src.left != dst.left || src.top != dst.top)
-    {
-        TRACE( "copying %s -> %s\n", wine_dbgstr_rect( &src ), wine_dbgstr_rect( &dst ));
-        OffsetRect( &src, -window_rect->left, -window_rect->top );
-        OffsetRect( &dst, -window_rect->left, -window_rect->top );
-
-        copy_bits_from_surface( hwnd, &dst, &src );
-    }
-}
-
 /***********************************************************************
  *           NtUserBeginPaint (win32u.@)
  */
diff --git a/dlls/win32u/win32u_private.h b/dlls/win32u/win32u_private.h
index 9ec941ca7d4..6539fb0bff1 100644
--- a/dlls/win32u/win32u_private.h
+++ b/dlls/win32u/win32u_private.h
@@ -53,8 +53,6 @@ extern void move_window_bits( HWND hwnd, const RECT *visible_rect, const RECT *o
                               const RECT *window_rect, const RECT *valid_rects );
 extern void move_window_bits_surface( HWND hwnd, const RECT *window_rect, struct window_surface *old_surface,
                                       const RECT *old_visible_rect, const RECT *valid_rects );
-extern void move_window_bits_parent( HWND hwnd, const RECT *window_rect,
-                                     const RECT *valid_rects );
 extern void register_window_surface( struct window_surface *old,
                                      struct window_surface *new );
 
diff --git a/dlls/win32u/window.c b/dlls/win32u/window.c
index b868053796d..0122ac2e4f7 100644
--- a/dlls/win32u/window.c
+++ b/dlls/win32u/window.c
@@ -1959,7 +1959,7 @@ static BOOL apply_window_pos( HWND hwnd, HWND insert_after, UINT swp_flags,
                     rects[1] = old_visible_rect;
                     valid_rects = rects;
                 }
-                move_window_bits_parent( hwnd, window_rect, valid_rects );
+                move_window_bits( hwnd, &visible_rect, &visible_rect, window_rect, valid_rects );
                 valid_rects = NULL;  /* prevent the driver from trying to also move the bits */
             }
         }