Alexandros Frantzis : win32u: Reset draw_start_ticks for new window_surface.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 6d2bd75c4a82d10ee98c63010a5701d428ccc5d0
URL:    https://gitlab.winehq.org/wine/wine/-/commit/6d2bd75c4a82d10ee98c63010a5701d...

Author: Alexandros Frantzis 
Date:   Thu Feb 16 18:20:56 2023 +0200

win32u: Reset draw_start_ticks for new window_surface.

Normally, a new window_surface has no damage so its draw_start_ticks
value is reset at the time of the first lock_surface.

However, if contents from the old window_surface are copied to the new
one when the window_surface for a window is updated, the new
window_surface will be initially damaged. We want to reset the
draw_start_ticks value in this case too, to avoid flushes occuring soon
after such updates, during the initial redraw of the window_surface.

Signed-off-by: Alexandros Frantzis

---

dlls/win32u/dibdrv/dc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dlls/win32u/dibdrv/dc.c b/dlls/win32u/dibdrv/dc.c
index f96374c1229..23ef7f64390 100644
--- a/dlls/win32u/dibdrv/dc.c
+++ b/dlls/win32u/dibdrv/dc.c
@@ -744,7 +744,8 @@ static inline void lock_surface( struct windrv_physdev *dev )
 {
     /* gdi_lock should not be locked */
     dev->surface->funcs->lock( dev->surface );
-    if (IsRectEmpty( dev->dibdrv->bounds )) dev->surface->draw_start_ticks = NtGetTickCount();
+    if (IsRectEmpty( dev->dibdrv->bounds ) || dev->surface->draw_start_ticks == 0)
+        dev->surface->draw_start_ticks = NtGetTickCount();
 }

static inline void unlock_surface( struct windrv_physdev *dev )