From 638ca9a7a2363757dc5b5d456e10d34f6f158885 Mon Sep 17 00:00:00 2001 From: Jon TURNEY Date: Mon, 18 May 2009 18:14:41 +0100 Subject: Cygwin/X: Avoid a visual glitch on window move in rootless modes Handle and ignore WM_ERASEBKGND since we repaint the entire invalidated region anyhow (this avoids a white flickering on window resize) Signed-off-by: Jon TURNEY --- hw/xwin/winmultiwindowwndproc.c | 8 ++++++++ hw/xwin/winwin32rootlesswndproc.c | 11 +++++++++++ 2 files changed, 19 insertions(+) (limited to 'hw') diff --git a/hw/xwin/winmultiwindowwndproc.c b/hw/xwin/winmultiwindowwndproc.c index bd9edcb4d..313822972 100644 --- a/hw/xwin/winmultiwindowwndproc.c +++ b/hw/xwin/winmultiwindowwndproc.c @@ -453,6 +453,14 @@ winTopLevelWindowProc (HWND hwnd, UINT message, HandleCustomWM_INITMENU ((unsigned long)hwnd, wParam); break; + case WM_ERASEBKGND: + /* + * Pretend that we did erase the background but we don't care, + * since we repaint the entire region anyhow + * This avoids some flickering when resizing. + */ + return TRUE; + case WM_PAINT: /* Only paint if our window handle is valid */ if (hwndScreen == NULL) diff --git a/hw/xwin/winwin32rootlesswndproc.c b/hw/xwin/winwin32rootlesswndproc.c index e624ded36..4d7afee42 100755 --- a/hw/xwin/winwin32rootlesswndproc.c +++ b/hw/xwin/winwin32rootlesswndproc.c @@ -783,6 +783,17 @@ winMWExtWMWindowProc (HWND hwnd, UINT message, SendMessage (hwndScreen, message, wParam, lParam); return 0; + case WM_ERASEBKGND: +#if CYGDEBUG + winDebug ("winMWExtWMWindowProc - WM_ERASEBKGND\n"); +#endif + /* + * Pretend that we did erase the background but we don't care, + * since we repaint the entire region anyhow + * This avoids some flickering when resizing. + */ + return TRUE; + case WM_PAINT: /* BeginPaint gives us an hdc that clips to the invalidated region */ -- cgit v1.2.3