git.oblomov.eu Git - wine/blob - windows/painting.c

   1 /*
   2  * Window painting functions
   3  *
   4  * Copyright 1993, 1994, 1995 Alexandre Julliard
   5  */
   6
   7 #include <stdio.h>
   8 #include <X11/Xlib.h>
   9
  10 #include "win.h"
  11 #include "queue.h"
  12 #include "gdi.h"
  13 #include "dce.h"
  14 #include "stddebug.h"
  15 /* #define DEBUG_WIN */
  16 #include "debug.h"
  17
  18   /* Last CTLCOLOR id */
  19 #define CTLCOLOR_MAX   CTLCOLOR_STATIC
  20
  21 /***********************************************************************
  22  *           WIN_UpdateNCArea
  23  *
  24  */
  25 void WIN_UpdateNCArea(WND* wnd, BOOL bUpdate)
  26 {
  27     POINT16 pt = {0, 0};
  28     HRGN hClip = 1;
  29
  30     dprintf_nonclient(stddeb,"NCUpdate: hwnd %04x, hrgnUpdate %04x\n",
  31                       wnd->hwndSelf, wnd->hrgnUpdate );
  32
  33     /* desktop window doesn't have nonclient area */
  34     if(wnd == WIN_GetDesktop())
  35     {
  36         wnd->flags &= ~WIN_NEEDS_NCPAINT;
  37         return;
  38     }
  39
  40     if( wnd->hrgnUpdate > 1 )
  41     {
  42         ClientToScreen16(wnd->hwndSelf, &pt);
  43
  44         hClip = CreateRectRgn( 0, 0, 0, 0 );
  45         if (!CombineRgn(hClip, wnd->hrgnUpdate, 0, RGN_COPY) )
  46         {
  47             DeleteObject(hClip);
  48             hClip = 1;
  49         }
  50         else
  51             OffsetRgn(hClip, pt.x, pt.y);
  52
  53         if (bUpdate)
  54         {
  55             /* exclude non-client area from update region */
  56             HRGN hrgn = CreateRectRgn(0, 0, wnd->rectClient.right - wnd->rectClient.left,
  57                                             wnd->rectClient.bottom - wnd->rectClient.top);
  58
  59             if (hrgn && (CombineRgn(wnd->hrgnUpdate, wnd->hrgnUpdate,
  60                                     hrgn, RGN_AND) == NULLREGION))
  61             {
  62                 DeleteObject(wnd->hrgnUpdate);
  63                 wnd->hrgnUpdate = 1;
  64             }
  65
  66             DeleteObject( hrgn );
  67         }
  68     }
  69
  70     wnd->flags &= ~WIN_NEEDS_NCPAINT;
  71
  72     if ((wnd->hwndSelf == GetActiveWindow()) &&
  73         !(wnd->flags & WIN_NCACTIVATED))
  74     {
  75         wnd->flags |= WIN_NCACTIVATED;
  76         if( hClip > 1) DeleteObject(hClip);
  77         hClip = 1;
  78     }
  79
  80     if (hClip) SendMessage16( wnd->hwndSelf, WM_NCPAINT, hClip, 0L );
  81
  82     if (hClip > 1) DeleteObject( hClip );
  83 }
  84
  85
  86 /***********************************************************************
  87  *           BeginPaint16    (USER.39)
  88  */
  89 HDC16 BeginPaint16( HWND16 hwnd, LPPAINTSTRUCT16 lps )
  90 {
  91     BOOL32 bIcon;
  92     HRGN hrgnUpdate;
  93     WND *wndPtr = WIN_FindWndPtr( hwnd );
  94     if (!wndPtr) return 0;
  95
  96     bIcon = (wndPtr->dwStyle & WS_MINIMIZE && wndPtr->class->hIcon);
  97
  98     wndPtr->flags &= ~WIN_NEEDS_BEGINPAINT;
  99
 100     if (wndPtr->flags & WIN_NEEDS_NCPAINT) WIN_UpdateNCArea( wndPtr, TRUE );
 101
 102     if (((hrgnUpdate = wndPtr->hrgnUpdate) != 0) ||
 103         (wndPtr->flags & WIN_INTERNAL_PAINT))
 104         QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
 105
 106     wndPtr->hrgnUpdate = 0;
 107     wndPtr->flags &= ~WIN_INTERNAL_PAINT;
 108
 109     HideCaret( hwnd );
 110
 111     dprintf_win(stddeb,"hrgnUpdate = %04x, ", hrgnUpdate);
 112
 113     /* When bIcon is TRUE hrgnUpdate is automatically in window coordinates
 114      * (because rectClient == rectWindow for WS_MINIMIZE windows).
 115      */
 116
 117     lps->hdc = GetDCEx( hwnd, hrgnUpdate, DCX_INTERSECTRGN | DCX_WINDOWPAINT |
 118                         DCX_USESTYLE | (bIcon ? DCX_WINDOW : 0) );
 119
 120     dprintf_win(stddeb,"hdc = %04x\n", lps->hdc);
 121
 122     if (!lps->hdc)
 123     {
 124         fprintf(stderr, "GetDCEx() failed in BeginPaint(), hwnd=%04x\n", hwnd);
 125         return 0;
 126     }
 127
 128     GetRgnBox16( InquireVisRgn(lps->hdc), &lps->rcPaint );
 129     DPtoLP16( lps->hdc, (LPPOINT16)&lps->rcPaint, 2 );
 130
 131     if (wndPtr->flags & WIN_NEEDS_ERASEBKGND)
 132     {
 133         wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
 134         lps->fErase = !SendMessage16(hwnd, (bIcon) ? WM_ICONERASEBKGND
 135                                                    : WM_ERASEBKGND,
 136                                      (WPARAM)lps->hdc, 0 );
 137     }
 138     else lps->fErase = TRUE;
 139
 140     return lps->hdc;
 141 }
 142
 143
 144 /***********************************************************************
 145  *           BeginPaint32    (USER32.9)
 146  */
 147 HDC32 BeginPaint32( HWND32 hwnd, PAINTSTRUCT32 *lps )
 148 {
 149     PAINTSTRUCT16 ps;
 150
 151     BeginPaint16( hwnd, &ps );
 152     lps->hdc            = (HDC32)ps.hdc;
 153     lps->fErase         = ps.fErase;
 154     lps->rcPaint.top    = ps.rcPaint.top;
 155     lps->rcPaint.left   = ps.rcPaint.left;
 156     lps->rcPaint.right  = ps.rcPaint.right;
 157     lps->rcPaint.bottom = ps.rcPaint.bottom;
 158     lps->fRestore       = ps.fRestore;
 159     lps->fIncUpdate     = ps.fIncUpdate;
 160     return lps->hdc;
 161 }
 162
 163
 164 /***********************************************************************
 165  *           EndPaint16    (USER.40)
 166  */
 167 BOOL16 EndPaint16( HWND16 hwnd, const PAINTSTRUCT16* lps )
 168 {
 169     ReleaseDC( hwnd, lps->hdc );
 170     ShowCaret( hwnd );
 171     return TRUE;
 172 }
 173
 174
 175 /***********************************************************************
 176  *           EndPaint32    (USER32.175)
 177  */
 178 BOOL32 EndPaint32( HWND32 hwnd, const PAINTSTRUCT32 *lps )
 179 {
 180     ReleaseDC( hwnd, (HDC16)lps->hdc );
 181     ShowCaret( hwnd );
 182     return TRUE;
 183 }
 184
 185
 186 /***********************************************************************
 187  *           FillWindow    (USER.324)
 188  */
 189 void FillWindow( HWND16 hwndParent, HWND16 hwnd, HDC16 hdc, HBRUSH16 hbrush )
 190 {
 191     RECT16 rect;
 192     GetClientRect16( hwnd, &rect );
 193     DPtoLP16( hdc, (LPPOINT16)&rect, 2 );
 194     PaintRect( hwndParent, hwnd, hdc, hbrush, &rect );
 195 }
 196
 197
 198 /***********************************************************************
 199  *           PaintRect    (USER.325)
 200  */
 201 void PaintRect( HWND16 hwndParent, HWND16 hwnd, HDC16 hdc,
 202                 HBRUSH16 hbrush, const RECT16 *rect)
 203 {
 204       /* Send WM_CTLCOLOR message if needed */
 205
 206     if ((UINT32)hbrush <= CTLCOLOR_MAX)
 207     {
 208         if (!hwndParent) return;
 209         hbrush = (HBRUSH)SendMessage32A( hwndParent,
 210                                          WM_CTLCOLORMSGBOX + (UINT32)hbrush,
 211                                          (WPARAM)hdc, (LPARAM)hwnd );
 212     }
 213     if (hbrush) FillRect16( hdc, rect, hbrush );
 214 }
 215
 216
 217 /***********************************************************************
 218  *           GetControlBrush    (USER.326)
 219  */
 220 HBRUSH GetControlBrush( HWND hwnd, HDC hdc, WORD control )
 221 {
 222     return (HBRUSH)SendMessage32A( GetParent(hwnd), WM_CTLCOLOR+control,
 223                                    (WPARAM)hdc, (LPARAM)hwnd );
 224 }
 225
 226
 227 /***********************************************************************
 228  *           PAINT_RedrawWindow
 229  *
 230  * Note: Windows uses WM_SYNCPAINT to cut down the number of intertask
 231  * SendMessage() calls. From SDK:
 232  *   This message avoids lots of inter-app message traffic
 233  *   by switching to the other task and continuing the
 234  *   recursion there.
 235  *
 236  * wParam         = flags
 237  * LOWORD(lParam) = hrgnClip
 238  * HIWORD(lParam) = hwndSkip  (not used; always NULL)
 239  */
 240 BOOL32 PAINT_RedrawWindow( HWND32 hwnd, const RECT32 *rectUpdate,
 241                          HRGN32 hrgnUpdate, UINT32 flags, UINT32 control )
 242 {
 243     BOOL32 bIcon;
 244     HRGN hrgn;
 245     RECT32 rectClient;
 246     WND* wndPtr;
 247
 248     if (!hwnd) hwnd = GetDesktopWindow();
 249     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return FALSE;
 250     if (!IsWindowVisible(hwnd) || (wndPtr->flags & WIN_NO_REDRAW))
 251         return TRUE;  /* No redraw needed */
 252
 253     bIcon = (wndPtr->dwStyle & WS_MINIMIZE && wndPtr->class->hIcon);
 254     if (rectUpdate)
 255     {
 256         dprintf_win(stddeb, "RedrawWindow: %04x %d,%d-%d,%d %04x flags=%04x\n",
 257                     hwnd, rectUpdate->left, rectUpdate->top,
 258                     rectUpdate->right, rectUpdate->bottom, hrgnUpdate, flags );
 259     }
 260     else
 261     {
 262         dprintf_win(stddeb, "RedrawWindow: %04x NULL %04x flags=%04x\n",
 263                      hwnd, hrgnUpdate, flags);
 264     }
 265     GetClientRect32( hwnd, &rectClient );
 266
 267     if (flags & RDW_INVALIDATE)  /* Invalidate */
 268     {
 269         int rgnNotEmpty = COMPLEXREGION;
 270
 271         if (wndPtr->hrgnUpdate > 1)  /* Is there already an update region? */
 272         {
 273             if ((hrgn = hrgnUpdate) == 0)
 274                 hrgn = CreateRectRgnIndirect32( rectUpdate ? rectUpdate :
 275                                                 &rectClient );
 276             rgnNotEmpty = CombineRgn( wndPtr->hrgnUpdate, wndPtr->hrgnUpdate, hrgn, RGN_OR );
 277             if (!hrgnUpdate) DeleteObject( hrgn );
 278         }
 279         else  /* No update region yet */
 280         {
 281             if (!(wndPtr->flags & WIN_INTERNAL_PAINT))
 282                 QUEUE_IncPaintCount( wndPtr->hmemTaskQ );
 283             if (hrgnUpdate)
 284             {
 285                 wndPtr->hrgnUpdate = CreateRectRgn( 0, 0, 0, 0 );
 286                 rgnNotEmpty = CombineRgn( wndPtr->hrgnUpdate, hrgnUpdate, 0, RGN_COPY );
 287             }
 288             else wndPtr->hrgnUpdate = CreateRectRgnIndirect32( rectUpdate ?
 289                                                     rectUpdate : &rectClient );
 290         }
 291
 292         if (flags & RDW_FRAME) wndPtr->flags |= WIN_NEEDS_NCPAINT;
 293
 294         /* check for bogus update region */
 295         if ( rgnNotEmpty == NULLREGION )
 296            {
 297              wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
 298              DeleteObject(wndPtr->hrgnUpdate);
 299              wndPtr->hrgnUpdate=0;
 300              if (!(wndPtr->flags & WIN_INTERNAL_PAINT))
 301                    QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
 302            }
 303         else
 304              if (flags & RDW_ERASE) wndPtr->flags |= WIN_NEEDS_ERASEBKGND;
 305         flags |= RDW_FRAME;  /* Force children frame invalidation */
 306     }
 307     else if (flags & RDW_VALIDATE)  /* Validate */
 308     {
 309           /* We need an update region in order to validate anything */
 310         if (wndPtr->hrgnUpdate > 1)
 311         {
 312             if (!hrgnUpdate && !rectUpdate)
 313             {
 314                   /* Special case: validate everything */
 315                 DeleteObject( wndPtr->hrgnUpdate );
 316                 wndPtr->hrgnUpdate = 0;
 317             }
 318             else
 319             {
 320                 if ((hrgn = hrgnUpdate) == 0)
 321                     hrgn = CreateRectRgnIndirect32( rectUpdate );
 322                 if (CombineRgn( wndPtr->hrgnUpdate, wndPtr->hrgnUpdate,
 323                                 hrgn, RGN_DIFF ) == NULLREGION)
 324                 {
 325                     DeleteObject( wndPtr->hrgnUpdate );
 326                     wndPtr->hrgnUpdate = 0;
 327                 }
 328                 if (!hrgnUpdate) DeleteObject( hrgn );
 329             }
 330             if (!wndPtr->hrgnUpdate)  /* No more update region */
 331                 if (!(wndPtr->flags & WIN_INTERNAL_PAINT))
 332                     QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
 333         }
 334         if (flags & RDW_NOFRAME) wndPtr->flags &= ~WIN_NEEDS_NCPAINT;
 335         if (flags & RDW_NOERASE) wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
 336     }
 337
 338       /* Set/clear internal paint flag */
 339
 340     if (flags & RDW_INTERNALPAINT)
 341     {
 342         if ( wndPtr->hrgnUpdate <= 1 && !(wndPtr->flags & WIN_INTERNAL_PAINT))
 343             QUEUE_IncPaintCount( wndPtr->hmemTaskQ );
 344         wndPtr->flags |= WIN_INTERNAL_PAINT;
 345     }
 346     else if (flags & RDW_NOINTERNALPAINT)
 347     {
 348         if ( wndPtr->hrgnUpdate <= 1 && (wndPtr->flags & WIN_INTERNAL_PAINT))
 349             QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
 350         wndPtr->flags &= ~WIN_INTERNAL_PAINT;
 351     }
 352
 353       /* Erase/update window */
 354
 355     if (flags & RDW_UPDATENOW)
 356     {
 357         if (wndPtr->hrgnUpdate) /* wm_painticon wparam is 1 */
 358             SendMessage16( hwnd, (bIcon) ? WM_PAINTICON : WM_PAINT, bIcon, 0 );
 359     }
 360     else if (flags & RDW_ERASENOW)
 361     {
 362         if (wndPtr->flags & WIN_NEEDS_NCPAINT)
 363             WIN_UpdateNCArea( wndPtr, FALSE);
 364
 365         if (wndPtr->flags & WIN_NEEDS_ERASEBKGND)
 366         {
 367             HDC hdc = GetDCEx( hwnd, wndPtr->hrgnUpdate,
 368                                DCX_INTERSECTRGN | DCX_USESTYLE |
 369                                DCX_KEEPCLIPRGN | DCX_WINDOWPAINT |
 370                                (bIcon ? DCX_WINDOW : 0) );
 371             if (hdc)
 372             {
 373                if (SendMessage16( hwnd, (bIcon) ? WM_ICONERASEBKGND
 374                                                 : WM_ERASEBKGND,
 375                                   (WPARAM)hdc, 0 ))
 376                   wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
 377                ReleaseDC( hwnd, hdc );
 378             }
 379         }
 380     }
 381
 382       /* Recursively process children */
 383
 384     if (!(flags & RDW_NOCHILDREN) &&
 385         ((flags & RDW_ALLCHILDREN) || !(wndPtr->dwStyle & WS_CLIPCHILDREN)) &&
 386         !(wndPtr->dwStyle & WS_MINIMIZE) )
 387     {
 388         if ( hrgnUpdate || rectUpdate )
 389         {
 390            if( !(hrgn = CreateRectRgn( 0, 0, 0, 0 )) ) return TRUE;
 391            if( !hrgnUpdate )
 392              {
 393                 control |= (RDW_C_DELETEHRGN | RDW_C_USEHRGN);
 394                 if( !(hrgnUpdate = CreateRectRgnIndirect32( rectUpdate )) )
 395                 {
 396                     DeleteObject( hrgn );
 397                     return TRUE;
 398                 }
 399              }
 400            for (wndPtr = wndPtr->child; wndPtr; wndPtr = wndPtr->next)
 401              if( wndPtr->dwStyle & WS_VISIBLE )
 402                {
 403                  SetRectRgn( hrgn, wndPtr->rectWindow.left, wndPtr->rectWindow.top,
 404                                    wndPtr->rectWindow.right, wndPtr->rectWindow.bottom);
 405                  if( CombineRgn( hrgn, hrgn, hrgnUpdate, RGN_AND ) != NULLREGION )
 406                  {
 407                    if( control & RDW_C_USEHRGN &&
 408                        wndPtr->dwStyle & WS_CLIPSIBLINGS )
 409                        CombineRgn( hrgnUpdate, hrgnUpdate, hrgn, RGN_DIFF );
 410
 411                    OffsetRgn( hrgn, -wndPtr->rectClient.left,
 412                                  -wndPtr->rectClient.top );
 413                    PAINT_RedrawWindow( wndPtr->hwndSelf, NULL, hrgn, flags, RDW_C_USEHRGN );
 414                  }
 415                }
 416            DeleteObject( hrgn );
 417            if( control & RDW_C_DELETEHRGN ) DeleteObject( hrgnUpdate );
 418         }
 419         else for (wndPtr = wndPtr->child; wndPtr; wndPtr = wndPtr->next)
 420                   PAINT_RedrawWindow( wndPtr->hwndSelf, NULL, 0, flags, 0 );
 421
 422     }
 423     return TRUE;
 424 }
 425
 426
 427 /***********************************************************************
 428  *           RedrawWindow32    (USER32.425)
 429  */
 430 BOOL32 RedrawWindow32( HWND32 hwnd, const RECT32 *rectUpdate,
 431                        HRGN32 hrgnUpdate, UINT32 flags )
 432 {
 433     WND* wnd = WIN_FindWndPtr( hwnd );
 434
 435     /* check if there is something to redraw */
 436
 437     return ( wnd && WIN_IsWindowDrawable( wnd, !(flags & RDW_FRAME) ) )
 438            ? PAINT_RedrawWindow( hwnd, rectUpdate, hrgnUpdate, flags, 0 )
 439            : 1;
 440 }
 441
 442
 443 /***********************************************************************
 444  *           RedrawWindow16    (USER.290)
 445  */
 446 BOOL16 RedrawWindow16( HWND16 hwnd, const RECT16 *rectUpdate,
 447                        HRGN16 hrgnUpdate, UINT16 flags )
 448 {
 449     if (rectUpdate)
 450     {
 451         RECT32 r;
 452         CONV_RECT16TO32( rectUpdate, &r );
 453         return (BOOL16)RedrawWindow32( (HWND32)hwnd, &r, hrgnUpdate, flags );
 454     }
 455     return (BOOL16)RedrawWindow32( (HWND32)hwnd, NULL, hrgnUpdate, flags );
 456 }
 457
 458
 459 /***********************************************************************
 460  *           UpdateWindow   (USER.124) (USER32.566)
 461  */
 462 void UpdateWindow( HWND32 hwnd )
 463 {
 464     RedrawWindow32( hwnd, NULL, 0, RDW_UPDATENOW | RDW_NOCHILDREN );
 465 }
 466
 467
 468 /***********************************************************************
 469  *           InvalidateRgn   (USER.126) (USER32.328)
 470  */
 471 void InvalidateRgn( HWND32 hwnd, HRGN32 hrgn, BOOL32 erase )
 472 {
 473     RedrawWindow32(hwnd, NULL, hrgn, RDW_INVALIDATE | (erase ? RDW_ERASE : 0) );
 474 }
 475
 476
 477 /***********************************************************************
 478  *           InvalidateRect16   (USER.125)
 479  */
 480 void InvalidateRect16( HWND16 hwnd, const RECT16 *rect, BOOL16 erase )
 481 {
 482     RedrawWindow16( hwnd, rect, 0, RDW_INVALIDATE | (erase ? RDW_ERASE : 0) );
 483 }
 484
 485
 486 /***********************************************************************
 487  *           InvalidateRect32   (USER32.327)
 488  */
 489 void InvalidateRect32( HWND32 hwnd, const RECT32 *rect, BOOL32 erase )
 490 {
 491     RedrawWindow32( hwnd, rect, 0, RDW_INVALIDATE | (erase ? RDW_ERASE : 0) );
 492 }
 493
 494
 495 /***********************************************************************
 496  *           ValidateRgn   (USER.128) (USER32.571)
 497  */
 498 void ValidateRgn( HWND32 hwnd, HRGN32 hrgn )
 499 {
 500     RedrawWindow32( hwnd, NULL, hrgn, RDW_VALIDATE | RDW_NOCHILDREN );
 501 }
 502
 503
 504 /***********************************************************************
 505  *           ValidateRect16   (USER.127)
 506  */
 507 void ValidateRect16( HWND16 hwnd, const RECT16 *rect )
 508 {
 509     RedrawWindow16( hwnd, rect, 0, RDW_VALIDATE | RDW_NOCHILDREN );
 510 }
 511
 512
 513 /***********************************************************************
 514  *           ValidateRect32   (USER32.570)
 515  */
 516 void ValidateRect32( HWND32 hwnd, const RECT32 *rect )
 517 {
 518     RedrawWindow32( hwnd, rect, 0, RDW_VALIDATE | RDW_NOCHILDREN );
 519 }
 520
 521
 522 /***********************************************************************
 523  *           GetUpdateRect16   (USER.190)
 524  */
 525 BOOL16 GetUpdateRect16( HWND16 hwnd, LPRECT16 rect, BOOL16 erase )
 526 {
 527     RECT32 r;
 528     BOOL16 ret;
 529
 530     if (!rect) return GetUpdateRect32( hwnd, NULL, erase );
 531     ret = GetUpdateRect32( hwnd, &r, erase );
 532     CONV_RECT32TO16( &r, rect );
 533     return ret;
 534 }
 535
 536
 537 /***********************************************************************
 538  *           GetUpdateRect32   (USER32.296)
 539  */
 540 BOOL32 GetUpdateRect32( HWND32 hwnd, LPRECT32 rect, BOOL32 erase )
 541 {
 542     WND * wndPtr = WIN_FindWndPtr( hwnd );
 543     if (!wndPtr) return FALSE;
 544
 545     if (rect)
 546     {
 547         if (wndPtr->hrgnUpdate > 1)
 548         {
 549             HRGN hrgn = CreateRectRgn( 0, 0, 0, 0 );
 550             if (GetUpdateRgn( hwnd, hrgn, erase ) == ERROR) return FALSE;
 551             GetRgnBox32( hrgn, rect );
 552             DeleteObject( hrgn );
 553         }
 554         else SetRectEmpty32( rect );
 555     }
 556     return (wndPtr->hrgnUpdate > 1);
 557 }
 558
 559
 560 /***********************************************************************
 561  *           GetUpdateRgn   (USER.237) (USER32.297)
 562  */
 563 INT16 GetUpdateRgn( HWND32 hwnd, HRGN32 hrgn, BOOL32 erase )
 564 {
 565     INT16 retval;
 566     WND * wndPtr = WIN_FindWndPtr( hwnd );
 567     if (!wndPtr) return ERROR;
 568
 569     if (wndPtr->hrgnUpdate <= 1)
 570     {
 571         SetRectRgn( hrgn, 0, 0, 0, 0 );
 572         return NULLREGION;
 573     }
 574     retval = CombineRgn( hrgn, wndPtr->hrgnUpdate, 0, RGN_COPY );
 575     if (erase) RedrawWindow32( hwnd, NULL, 0, RDW_ERASENOW | RDW_NOCHILDREN );
 576     return retval;
 577 }
 578
 579
 580 /***********************************************************************
 581  *           ExcludeUpdateRgn   (USER.238) (USER32.194)
 582  */
 583 INT16 ExcludeUpdateRgn( HDC32 hdc, HWND32 hwnd )
 584 {
 585     INT16 retval = ERROR;
 586     HRGN hrgn;
 587     WND * wndPtr;
 588
 589     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return ERROR;
 590     if ((hrgn = CreateRectRgn( 0, 0, 0, 0 )) != 0)
 591     {
 592         retval = CombineRgn( hrgn, InquireVisRgn(hdc),
 593                              (wndPtr->hrgnUpdate>1)?wndPtr->hrgnUpdate:0,
 594                              (wndPtr->hrgnUpdate>1)?RGN_DIFF:RGN_COPY);
 595         if (retval) SelectVisRgn( hdc, hrgn );
 596         DeleteObject( hrgn );
 597     }
 598     return retval;
 599 }
 600
 601