Rémi Bernon : win32u: Use window monitor DPI in get_windows_offset when dpi is 0.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 0d8d99765b47b48e5429f7b50ce9dd2d1a2a009c
URL:    https://gitlab.winehq.org/wine/wine/-/commit/0d8d99765b47b48e5429f7b50ce9dd2...

Author: Rémi Bernon 
Date:   Mon Jun 10 10:20:03 2024 +0200

win32u: Use window monitor DPI in get_windows_offset when dpi is 0.

The server path advertises doing a similar thing.

---

dlls/win32u/window.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/dlls/win32u/window.c b/dlls/win32u/window.c
index 51d8e0eb710..162b9e370dc 100644
--- a/dlls/win32u/window.c
+++ b/dlls/win32u/window.c
@@ -2784,6 +2784,7 @@ static BOOL get_windows_offset( HWND hwnd_from, HWND hwnd_to, UINT dpi, BOOL *mi
         if (win == WND_OTHER_PROCESS) goto other_process;
         if (win != WND_DESKTOP)
         {
+            UINT dpi_from = dpi ? dpi : get_win_monitor_dpi( hwnd_from );
             if (win->dwExStyle & WS_EX_LAYOUTRTL)
             {
                 mirror_from = TRUE;
@@ -2805,7 +2806,7 @@ static BOOL get_windows_offset( HWND hwnd_from, HWND hwnd_to, UINT dpi, BOOL *mi
                 }
             }
             if (win && win != WND_DESKTOP) release_win_ptr( win );
-            offset = map_dpi_point( offset, get_dpi_for_window( hwnd_from ), dpi );
+            offset = map_dpi_point( offset, get_dpi_for_window( hwnd_from ), dpi_from );
         }
     }

@@ -2820,6 +2821,7 @@ static BOOL get_windows_offset( HWND hwnd_from, HWND hwnd_to, UINT dpi, BOOL *mi
         if (win == WND_OTHER_PROCESS) goto other_process;
         if (win != WND_DESKTOP)
         {
+            UINT dpi_to = dpi ? dpi : get_win_monitor_dpi( hwnd_to );
             POINT pt = { 0, 0 };
             if (win->dwExStyle & WS_EX_LAYOUTRTL)
             {
@@ -2842,7 +2844,7 @@ static BOOL get_windows_offset( HWND hwnd_from, HWND hwnd_to, UINT dpi, BOOL *mi
                 }
             }
             if (win && win != WND_DESKTOP) release_win_ptr( win );
-            pt = map_dpi_point( pt, get_dpi_for_window( hwnd_to ), dpi );
+            pt = map_dpi_point( pt, get_dpi_for_window( hwnd_to ), dpi_to );
             offset.x -= pt.x;
             offset.y -= pt.y;
         }