// int GetUpdateRgn(HWND hWnd, HRGN hRgn, BOOL bErase)
public static int GetUpdateRgn(int hWnd, int hRgn, int bErase) {
WinWindow win = WinWindow.get(hWnd);
WinRegion rgn = WinRegion.get(hRgn);
if (win == null || rgn == null) return ERROR;
if (win.needsPainting()) {
if (bErase != 0) {
rgn.rects.clear();
rgn.rects.add(new WinRect(0, 0, win.rectWindow.width(), win.rectWindow.height()));
Message.SendMessageA(hWnd, WM_NCPAINT, hRgn, 0);
int hdc = win.getDC().handle;
Message.SendMessageA(hWnd, WM_ERASEBKGND, hdc, 0);
ReleaseDC(hWnd, hdc);
}
rgn.rects.clear();
rgn.rects.add(new WinRect(0, 0, win.rectClient.width(), win.rectClient.height()));
return SIMPLEREGION;
}
return NULLREGION;
}
