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 <alexandros.frantzis@collabora.com>

win32u: Reset draw_start_ticks for new window_surface.
6d2bd75c · Alexandros Frantzis · Alexandre Julliard · aa72d7d4 · 6d2bd75c
Commit 6d2bd75c authored Feb 16, 2023 by Alexandros Frantzis Committed by Alexandre Julliard Feb 21, 2023
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dc.c dlls/win32u/dibdrv/dc.c +2 -1

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--- 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 )