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More efficient version of _gdk_win32_window_queue_translation()

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Don't create create an extraneous expose event for any scroll operation
that gtk+ does. Thanks to Alex for the hint.
This commit is contained in:
Hans Breuer 2009-07-17 14:26:02 +02:00
parent d8d62ceb99
commit d0cf137ed9
1 changed files with 30 additions and 7 deletions
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33
gdk/win32/gdkwindow-win32.c
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@ -3593,17 +3593,40 @@ _gdk_win32_window_queue_antiexpose (GdkWindow *window,
return FALSE;
}
/*
* queue_translation is meant to only move any outstanding invalid area
* in the given area by dx,dy. A typical example of when its needed is an
* app with two toplevels where one (A) overlaps the other (B). If the
* app first moves A so that B is invalidated and then scrolls B before
* handling the expose. The scroll operation will copy the invalid area
* to a new position, but when the invalid area is then exposed it only
* redraws the old areas not the place where the invalid data was copied
* by the scroll.
*/
static void
_gdk_win32_window_queue_translation (GdkWindow *window,
GdkRegion *area,
gint dx,
gint dy)
{
/* TODO: Get current updateregion, move any part of it that intersects area by dx,dy */
HRGN hrgn = _gdk_win32_gdkregion_to_hrgn (area, dx, dy);
API_CALL (InvalidateRgn, (GDK_WINDOW_HWND (window), hrgn, TRUE));
HRGN hrgn = CreateRectRgn (0, 0, 0, 0);
int ret = GetUpdateRgn (GDK_WINDOW_HWND (window), hrgn, FALSE);
if (ret == ERROR)
WIN32_API_FAILED ("GetUpdateRgn");
else if (ret != NULLREGION)
{
/* Get current updateregion, move any part of it that intersects area by dx,dy */
HRGN update = _gdk_win32_gdkregion_to_hrgn (area, 0, 0);
ret = CombineRgn (update, hrgn, update, RGN_AND);
if (ret == ERROR)
WIN32_API_FAILED ("CombineRgn");
else if (ret != NULLREGION)
{
OffsetRgn (update, dx, dy);
API_CALL (InvalidateRgn, (GDK_WINDOW_HWND (window), update, TRUE));
}
DeleteObject (update);
}
DeleteObject (hrgn);
}