Any comments?

WMrepaint:
call timer
call paint
jmp .end

WMresize:
call resize
call paint
jmp .end

.end:
    

LRESULT CALLBACK WndProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
     static   HDC               bufDIBDC;
     static   HBITMAP           hMainDIB;
              HDC               hdc ;
              PAINTSTRUCT       ps ;
     static   HGDIOBJ           hOldDIB=0, hGDITmp;
              int               bResult;

     switch (message)
     {
     case WM_CHAR :
          if (wParam == VK_ESCAPE) {
            goto     wmDestruimos;
          }  
          return 0 ;

     case WM_CREATE:
          hdc = GetDC(hWnd);
          
          // Crea un búfer dib para PintaObjeto. pMainDIB es un puntero a él
          bufDIBDC = CreateCompatibleDC (hdc);
          hMainDIB = CreateDIBSection(hdc, (BITMAPINFO *) &bi, DIB_RGB_COLORS, (void **) &pMainDIB, NULL, 0);
          hOldDIB  = SelectObject (bufDIBDC, hMainDIB);
        
          ReleaseDC (hWnd, hdc);   // Libera device context
          
          Inicio ();
          SetTimer (hWnd, cdIdTimer, 40, NULL) ;
          return 0 ;

     case WM_TIMER :
          InvalidateRect (hWnd, NULL, FALSE) ;
          return 0 ;

     case WM_SIZE :
          vdxClient = lParam & 0xFFFF;
          vdyClient = lParam >> 0x10;
          return 0 ;

     case WM_PAINT :
          hdc = BeginPaint(hWnd, &ps);
          PintaObjeto ();
          // bResult = BitBlt(hdc, 0, 0, cdXSize, cdYSize, bufDIBDC, 0, 0, SRCCOPY);
          bResult = StretchBlt (hdc, 0, 0, vdxClient, vdyClient, bufDIBDC, 0, 0, cdXSize, cdYSize, SRCCOPY);
          EndPaint(hWnd, &ps);
          return 0 ;

     case WM_DESTROY :
          wmDestruimos:
          KillTimer (hWnd, cdIdTimer) ;
          hGDITmp = SelectObject (bufDIBDC, hOldDIB);
          bResult = DeleteDC (bufDIBDC);
          bResult = DeleteObject (hMainDIB);
          bResult = DestroyWindow (hWnd);
          PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hWnd, message, wParam, lParam) ;
}
    

case WM_TIMER:
timeout = true;
...


case WM_PAINT:
if (timeout) {
paint();
}
timeout = false;
...