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     HRGN32 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 = CreateRectRgn32( 0, 0, 0, 0 );
  45         if (!CombineRgn32( hClip, wnd->hrgnUpdate, 0, RGN_COPY ))
  46         {
  47             DeleteObject32(hClip);
  48             hClip = 1;
  49         }
  50         else
  51             OffsetRgn32( hClip, pt.x, pt.y );
  52
  53         if (bUpdate)
  54         {
  55             /* exclude non-client area from update region */
  56             HRGN32 hrgn = CreateRectRgn32( 0, 0,
  57                                  wnd->rectClient.right - wnd->rectClient.left,
  58                                  wnd->rectClient.bottom - wnd->rectClient.top);
  59
  60             if (hrgn && (CombineRgn32( wnd->hrgnUpdate, wnd->hrgnUpdate,
  61                                        hrgn, RGN_AND) == NULLREGION))
  62             {
  63                 DeleteObject32( wnd->hrgnUpdate );
  64                 wnd->hrgnUpdate = 1;
  65             }
  66
  67             DeleteObject32( hrgn );
  68         }
  69     }
  70
  71     wnd->flags &= ~WIN_NEEDS_NCPAINT;
  72
  73     if ((wnd->hwndSelf == GetActiveWindow()) &&
  74         !(wnd->flags & WIN_NCACTIVATED))
  75     {
  76         wnd->flags |= WIN_NCACTIVATED;
  77         if( hClip > 1) DeleteObject32( hClip );
  78         hClip = 1;
  79     }
  80
  81     if (hClip) SendMessage16( wnd->hwndSelf, WM_NCPAINT, hClip, 0L );
  82
  83     if (hClip > 1) DeleteObject32( hClip );
  84 }
  85
  86
  87 /***********************************************************************
  88  *           BeginPaint16    (USER.39)
  89  */
  90 HDC16 BeginPaint16( HWND16 hwnd, LPPAINTSTRUCT16 lps )
  91 {
  92     BOOL32 bIcon;
  93     HRGN32 hrgnUpdate;
  94     WND *wndPtr = WIN_FindWndPtr( hwnd );
  95     if (!wndPtr) return 0;
  96
  97     bIcon = (wndPtr->dwStyle & WS_MINIMIZE && wndPtr->class->hIcon);
  98
  99     wndPtr->flags &= ~WIN_NEEDS_BEGINPAINT;
 100
 101     if (wndPtr->flags & WIN_NEEDS_NCPAINT) WIN_UpdateNCArea( wndPtr, TRUE );
 102
 103     if (((hrgnUpdate = wndPtr->hrgnUpdate) != 0) ||
 104         (wndPtr->flags & WIN_INTERNAL_PAINT))
 105         QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
 106
 107     wndPtr->hrgnUpdate = 0;
 108     wndPtr->flags &= ~WIN_INTERNAL_PAINT;
 109
 110     HideCaret( hwnd );
 111
 112     dprintf_win(stddeb,"hrgnUpdate = %04x, ", hrgnUpdate);
 113
 114     /* When bIcon is TRUE hrgnUpdate is automatically in window coordinates
 115      * (because rectClient == rectWindow for WS_MINIMIZE windows).
 116      */
 117
 118     if (wndPtr->class->style & CS_PARENTDC)
 119         /* Don't clip the output to the update region for CS_PARENTDC window */
 120         lps->hdc = GetDCEx16( hwnd, 0, DCX_WINDOWPAINT | DCX_USESTYLE |
 121                               (bIcon ? DCX_WINDOW : 0) );
 122     else
 123         lps->hdc = GetDCEx16(hwnd, hrgnUpdate, DCX_INTERSECTRGN |
 124                              DCX_WINDOWPAINT | DCX_USESTYLE |
 125                              (bIcon ? DCX_WINDOW : 0) );
 126
 127     dprintf_win(stddeb,"hdc = %04x\n", lps->hdc);
 128
 129     if (!lps->hdc)
 130     {
 131         fprintf(stderr, "GetDCEx() failed in BeginPaint(), hwnd=%04x\n", hwnd);
 132         return 0;
 133     }
 134
 135     GetRgnBox16( InquireVisRgn(lps->hdc), &lps->rcPaint );
 136     DPtoLP16( lps->hdc, (LPPOINT16)&lps->rcPaint, 2 );
 137
 138     if (wndPtr->flags & WIN_NEEDS_ERASEBKGND)
 139     {
 140         wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
 141         lps->fErase = !SendMessage16(hwnd, (bIcon) ? WM_ICONERASEBKGND
 142                                                    : WM_ERASEBKGND,
 143                                      (WPARAM16)lps->hdc, 0 );
 144     }
 145     else lps->fErase = TRUE;
 146
 147     return lps->hdc;
 148 }
 149
 150
 151 /***********************************************************************
 152  *           BeginPaint32    (USER32.9)
 153  */
 154 HDC32 BeginPaint32( HWND32 hwnd, PAINTSTRUCT32 *lps )
 155 {
 156     PAINTSTRUCT16 ps;
 157
 158     BeginPaint16( hwnd, &ps );
 159     lps->hdc            = (HDC32)ps.hdc;
 160     lps->fErase         = ps.fErase;
 161     lps->rcPaint.top    = ps.rcPaint.top;
 162     lps->rcPaint.left   = ps.rcPaint.left;
 163     lps->rcPaint.right  = ps.rcPaint.right;
 164     lps->rcPaint.bottom = ps.rcPaint.bottom;
 165     lps->fRestore       = ps.fRestore;
 166     lps->fIncUpdate     = ps.fIncUpdate;
 167     return lps->hdc;
 168 }
 169
 170
 171 /***********************************************************************
 172  *           EndPaint16    (USER.40)
 173  */
 174 BOOL16 EndPaint16( HWND16 hwnd, const PAINTSTRUCT16* lps )
 175 {
 176     ReleaseDC16( hwnd, lps->hdc );
 177     ShowCaret( hwnd );
 178     return TRUE;
 179 }
 180
 181
 182 /***********************************************************************
 183  *           EndPaint32    (USER32.175)
 184  */
 185 BOOL32 EndPaint32( HWND32 hwnd, const PAINTSTRUCT32 *lps )
 186 {
 187     ReleaseDC32( hwnd, lps->hdc );
 188     ShowCaret( hwnd );
 189     return TRUE;
 190 }
 191
 192
 193 /***********************************************************************
 194  *           FillWindow    (USER.324)
 195  */
 196 void FillWindow( HWND16 hwndParent, HWND16 hwnd, HDC16 hdc, HBRUSH16 hbrush )
 197 {
 198     RECT16 rect;
 199     GetClientRect16( hwnd, &rect );
 200     DPtoLP16( hdc, (LPPOINT16)&rect, 2 );
 201     PaintRect( hwndParent, hwnd, hdc, hbrush, &rect );
 202 }
 203
 204
 205 /***********************************************************************
 206  *           PaintRect    (USER.325)
 207  */
 208 void PaintRect( HWND16 hwndParent, HWND16 hwnd, HDC16 hdc,
 209                 HBRUSH16 hbrush, const RECT16 *rect)
 210 {
 211       /* Send WM_CTLCOLOR message if needed */
 212
 213     if ((UINT32)hbrush <= CTLCOLOR_MAX)
 214     {
 215         if (!hwndParent) return;
 216         hbrush = (HBRUSH16)SendMessage32A( hwndParent,
 217                                            WM_CTLCOLORMSGBOX + (UINT32)hbrush,
 218                                            (WPARAM32)hdc, (LPARAM)hwnd );
 219     }
 220     if (hbrush) FillRect16( hdc, rect, hbrush );
 221 }
 222
 223
 224 /***********************************************************************
 225  *           GetControlBrush    (USER.326)
 226  */
 227 HBRUSH16 GetControlBrush( HWND hwnd, HDC16 hdc, WORD control )
 228 {
 229     return (HBRUSH16)SendMessage32A( GetParent32(hwnd), WM_CTLCOLOR+control,
 230                                      (WPARAM32)hdc, (LPARAM)hwnd );
 231 }
 232
 233
 234 /***********************************************************************
 235  *           PAINT_RedrawWindow
 236  *
 237  * Note: Windows uses WM_SYNCPAINT to cut down the number of intertask
 238  * SendMessage() calls. From SDK:
 239  *   This message avoids lots of inter-app message traffic
 240  *   by switching to the other task and continuing the
 241  *   recursion there.
 242  *
 243  * wParam         = flags
 244  * LOWORD(lParam) = hrgnClip
 245  * HIWORD(lParam) = hwndSkip  (not used; always NULL)
 246  */
 247 BOOL32 PAINT_RedrawWindow( HWND32 hwnd, const RECT32 *rectUpdate,
 248                            HRGN32 hrgnUpdate, UINT32 flags, UINT32 control )
 249 {
 250     BOOL32 bIcon;
 251     HRGN32 hrgn;
 252     RECT32 rectClient;
 253     WND* wndPtr;
 254
 255     if (!hwnd) hwnd = GetDesktopWindow32();
 256     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return FALSE;
 257     if (!IsWindowVisible(hwnd) || (wndPtr->flags & WIN_NO_REDRAW))
 258         return TRUE;  /* No redraw needed */
 259
 260     bIcon = (wndPtr->dwStyle & WS_MINIMIZE && wndPtr->class->hIcon);
 261     if (rectUpdate)
 262     {
 263         dprintf_win(stddeb, "RedrawWindow: %04x %d,%d-%d,%d %04x flags=%04x\n",
 264                     hwnd, rectUpdate->left, rectUpdate->top,
 265                     rectUpdate->right, rectUpdate->bottom, hrgnUpdate, flags );
 266     }
 267     else
 268     {
 269         dprintf_win(stddeb, "RedrawWindow: %04x NULL %04x flags=%04x\n",
 270                      hwnd, hrgnUpdate, flags);
 271     }
 272
 273     GetClientRect32( hwnd, &rectClient );
 274
 275     if (flags & RDW_INVALIDATE)  /* Invalidate */
 276     {
 277         int rgnNotEmpty = COMPLEXREGION;
 278
 279         if (wndPtr->hrgnUpdate > 1)  /* Is there already an update region? */
 280         {
 281             if ((hrgn = hrgnUpdate) == 0)
 282                 hrgn = CreateRectRgnIndirect32( rectUpdate ? rectUpdate :
 283                                                 &rectClient );
 284             rgnNotEmpty = CombineRgn32( wndPtr->hrgnUpdate, wndPtr->hrgnUpdate,
 285                                         hrgn, RGN_OR );
 286             if (!hrgnUpdate) DeleteObject32( hrgn );
 287         }
 288         else  /* No update region yet */
 289         {
 290             if (!(wndPtr->flags & WIN_INTERNAL_PAINT))
 291                 QUEUE_IncPaintCount( wndPtr->hmemTaskQ );
 292             if (hrgnUpdate)
 293             {
 294                 wndPtr->hrgnUpdate = CreateRectRgn32( 0, 0, 0, 0 );
 295                 rgnNotEmpty = CombineRgn32( wndPtr->hrgnUpdate, hrgnUpdate,
 296                                             0, RGN_COPY );
 297             }
 298             else wndPtr->hrgnUpdate = CreateRectRgnIndirect32( rectUpdate ?
 299                                                     rectUpdate : &rectClient );
 300         }
 301
 302         if (flags & RDW_FRAME) wndPtr->flags |= WIN_NEEDS_NCPAINT;
 303
 304         /* check for bogus update region */
 305         if ( rgnNotEmpty == NULLREGION )
 306            {
 307              wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
 308              DeleteObject32( wndPtr->hrgnUpdate );
 309              wndPtr->hrgnUpdate=0;
 310              if (!(wndPtr->flags & WIN_INTERNAL_PAINT))
 311                    QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
 312            }
 313         else
 314              if (flags & RDW_ERASE) wndPtr->flags |= WIN_NEEDS_ERASEBKGND;
 315         flags |= RDW_FRAME;  /* Force children frame invalidation */
 316     }
 317     else if (flags & RDW_VALIDATE)  /* Validate */
 318     {
 319           /* We need an update region in order to validate anything */
 320         if (wndPtr->hrgnUpdate > 1)
 321         {
 322             if (!hrgnUpdate && !rectUpdate)
 323             {
 324                   /* Special case: validate everything */
 325                 DeleteObject32( wndPtr->hrgnUpdate );
 326                 wndPtr->hrgnUpdate = 0;
 327             }
 328             else
 329             {
 330                 if ((hrgn = hrgnUpdate) == 0)
 331                     hrgn = CreateRectRgnIndirect32( rectUpdate );
 332                 if (CombineRgn32( wndPtr->hrgnUpdate, wndPtr->hrgnUpdate,
 333                                   hrgn, RGN_DIFF ) == NULLREGION)
 334                 {
 335                     DeleteObject32( wndPtr->hrgnUpdate );
 336                     wndPtr->hrgnUpdate = 0;
 337                 }
 338                 if (!hrgnUpdate) DeleteObject32( hrgn );
 339             }
 340             if (!wndPtr->hrgnUpdate)  /* No more update region */
 341                 if (!(wndPtr->flags & WIN_INTERNAL_PAINT))
 342                     QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
 343         }
 344         if (flags & RDW_NOFRAME) wndPtr->flags &= ~WIN_NEEDS_NCPAINT;
 345         if (flags & RDW_NOERASE) wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
 346     }
 347
 348       /* Set/clear internal paint flag */
 349
 350     if (flags & RDW_INTERNALPAINT)
 351     {
 352         if ( wndPtr->hrgnUpdate <= 1 && !(wndPtr->flags & WIN_INTERNAL_PAINT))
 353             QUEUE_IncPaintCount( wndPtr->hmemTaskQ );
 354         wndPtr->flags |= WIN_INTERNAL_PAINT;
 355     }
 356     else if (flags & RDW_NOINTERNALPAINT)
 357     {
 358         if ( wndPtr->hrgnUpdate <= 1 && (wndPtr->flags & WIN_INTERNAL_PAINT))
 359             QUEUE_DecPaintCount( wndPtr->hmemTaskQ );
 360         wndPtr->flags &= ~WIN_INTERNAL_PAINT;
 361     }
 362
 363       /* Erase/update window */
 364
 365     if (flags & RDW_UPDATENOW)
 366     {
 367         if (wndPtr->hrgnUpdate) /* wm_painticon wparam is 1 */
 368             SendMessage16( hwnd, (bIcon) ? WM_PAINTICON : WM_PAINT, bIcon, 0 );
 369     }
 370     else if (flags & RDW_ERASENOW)
 371     {
 372         if (wndPtr->flags & WIN_NEEDS_NCPAINT)
 373             WIN_UpdateNCArea( wndPtr, FALSE);
 374
 375         if (wndPtr->flags & WIN_NEEDS_ERASEBKGND)
 376         {
 377             HDC32 hdc = GetDCEx32( hwnd, wndPtr->hrgnUpdate,
 378                                    DCX_INTERSECTRGN | DCX_USESTYLE |
 379                                    DCX_KEEPCLIPRGN | DCX_WINDOWPAINT |
 380                                    (bIcon ? DCX_WINDOW : 0) );
 381             if (hdc)
 382             {
 383                if (SendMessage16( hwnd, (bIcon) ? WM_ICONERASEBKGND
 384                                                 : WM_ERASEBKGND,
 385                                   (WPARAM16)hdc, 0 ))
 386                   wndPtr->flags &= ~WIN_NEEDS_ERASEBKGND;
 387                ReleaseDC32( hwnd, hdc );
 388             }
 389         }
 390     }
 391
 392       /* Recursively process children */
 393
 394     if (!(flags & RDW_NOCHILDREN) &&
 395         ((flags & RDW_ALLCHILDREN) || !(wndPtr->dwStyle & WS_CLIPCHILDREN)) &&
 396         !(wndPtr->dwStyle & WS_MINIMIZE) )
 397     {
 398         if ( hrgnUpdate || rectUpdate )
 399         {
 400            if (!(hrgn = CreateRectRgn32( 0, 0, 0, 0 ))) return TRUE;
 401            if( !hrgnUpdate )
 402              {
 403                 control |= (RDW_C_DELETEHRGN | RDW_C_USEHRGN);
 404                 if( !(hrgnUpdate = CreateRectRgnIndirect32( rectUpdate )) )
 405                 {
 406                     DeleteObject32( hrgn );
 407                     return TRUE;
 408                 }
 409              }
 410            for (wndPtr = wndPtr->child; wndPtr; wndPtr = wndPtr->next)
 411              if( wndPtr->dwStyle & WS_VISIBLE )
 412                {
 413                    SetRectRgn( hrgn, wndPtr->rectWindow.left,
 414                                wndPtr->rectWindow.top,
 415                                wndPtr->rectWindow.right,
 416                                wndPtr->rectWindow.bottom );
 417                    if (!CombineRgn32( hrgn, hrgn, hrgnUpdate, RGN_AND ))
 418                        continue;
 419                    OffsetRgn32( hrgn, -wndPtr->rectClient.left,
 420                                       -wndPtr->rectClient.top );
 421                    PAINT_RedrawWindow( wndPtr->hwndSelf, NULL, hrgn, flags,
 422                                        RDW_C_USEHRGN );
 423                }
 424            DeleteObject32( hrgn );
 425            if (control & RDW_C_DELETEHRGN) DeleteObject32( hrgnUpdate );
 426         }
 427         else for (wndPtr = wndPtr->child; wndPtr; wndPtr = wndPtr->next)
 428                   PAINT_RedrawWindow( wndPtr->hwndSelf, NULL, 0, flags, 0 );
 429
 430     }
 431     return TRUE;
 432 }
 433
 434
 435 /***********************************************************************
 436  *           RedrawWindow32    (USER32.425)
 437  */
 438 BOOL32 RedrawWindow32( HWND32 hwnd, const RECT32 *rectUpdate,
 439                        HRGN32 hrgnUpdate, UINT32 flags )
 440 {
 441     WND* wnd = WIN_FindWndPtr( hwnd );
 442
 443     /* check if there is something to redraw */
 444
 445     return ( wnd && WIN_IsWindowDrawable( wnd, !(flags & RDW_FRAME) ) )
 446            ? PAINT_RedrawWindow( hwnd, rectUpdate, hrgnUpdate, flags, 0 )
 447            : 1;
 448 }
 449
 450
 451 /***********************************************************************
 452  *           RedrawWindow16    (USER.290)
 453  */
 454 BOOL16 RedrawWindow16( HWND16 hwnd, const RECT16 *rectUpdate,
 455                        HRGN16 hrgnUpdate, UINT16 flags )
 456 {
 457     if (rectUpdate)
 458     {
 459         RECT32 r;
 460         CONV_RECT16TO32( rectUpdate, &r );
 461         return (BOOL16)RedrawWindow32( (HWND32)hwnd, &r, hrgnUpdate, flags );
 462     }
 463     return (BOOL16)RedrawWindow32( (HWND32)hwnd, NULL, hrgnUpdate, flags );
 464 }
 465
 466
 467 /***********************************************************************
 468  *           UpdateWindow   (USER.124) (USER32.566)
 469  */
 470 void UpdateWindow( HWND32 hwnd )
 471 {
 472     RedrawWindow32( hwnd, NULL, 0, RDW_UPDATENOW | RDW_NOCHILDREN );
 473 }
 474
 475
 476 /***********************************************************************
 477  *           InvalidateRgn   (USER.126) (USER32.328)
 478  */
 479 void InvalidateRgn( HWND32 hwnd, HRGN32 hrgn, BOOL32 erase )
 480 {
 481     RedrawWindow32(hwnd, NULL, hrgn, RDW_INVALIDATE | (erase ? RDW_ERASE : 0) );
 482 }
 483
 484
 485 /***********************************************************************
 486  *           InvalidateRect16   (USER.125)
 487  */
 488 void InvalidateRect16( HWND16 hwnd, const RECT16 *rect, BOOL16 erase )
 489 {
 490     RedrawWindow16( hwnd, rect, 0, RDW_INVALIDATE | (erase ? RDW_ERASE : 0) );
 491 }
 492
 493
 494 /***********************************************************************
 495  *           InvalidateRect32   (USER32.327)
 496  */
 497 void InvalidateRect32( HWND32 hwnd, const RECT32 *rect, BOOL32 erase )
 498 {
 499     RedrawWindow32( hwnd, rect, 0, RDW_INVALIDATE | (erase ? RDW_ERASE : 0) );
 500 }
 501
 502
 503 /***********************************************************************
 504  *           ValidateRgn   (USER.128) (USER32.571)
 505  */
 506 void ValidateRgn( HWND32 hwnd, HRGN32 hrgn )
 507 {
 508     RedrawWindow32( hwnd, NULL, hrgn, RDW_VALIDATE | RDW_NOCHILDREN );
 509 }
 510
 511
 512 /***********************************************************************
 513  *           ValidateRect16   (USER.127)
 514  */
 515 void ValidateRect16( HWND16 hwnd, const RECT16 *rect )
 516 {
 517     RedrawWindow16( hwnd, rect, 0, RDW_VALIDATE | RDW_NOCHILDREN );
 518 }
 519
 520
 521 /***********************************************************************
 522  *           ValidateRect32   (USER32.570)
 523  */
 524 void ValidateRect32( HWND32 hwnd, const RECT32 *rect )
 525 {
 526     RedrawWindow32( hwnd, rect, 0, RDW_VALIDATE | RDW_NOCHILDREN );
 527 }
 528
 529
 530 /***********************************************************************
 531  *           GetUpdateRect16   (USER.190)
 532  */
 533 BOOL16 GetUpdateRect16( HWND16 hwnd, LPRECT16 rect, BOOL16 erase )
 534 {
 535     RECT32 r;
 536     BOOL16 ret;
 537
 538     if (!rect) return GetUpdateRect32( hwnd, NULL, erase );
 539     ret = GetUpdateRect32( hwnd, &r, erase );
 540     CONV_RECT32TO16( &r, rect );
 541     return ret;
 542 }
 543
 544
 545 /***********************************************************************
 546  *           GetUpdateRect32   (USER32.296)
 547  */
 548 BOOL32 GetUpdateRect32( HWND32 hwnd, LPRECT32 rect, BOOL32 erase )
 549 {
 550     WND * wndPtr = WIN_FindWndPtr( hwnd );
 551     if (!wndPtr) return FALSE;
 552
 553     if (rect)
 554     {
 555         if (wndPtr->hrgnUpdate > 1)
 556         {
 557             HRGN32 hrgn = CreateRectRgn32( 0, 0, 0, 0 );
 558             if (GetUpdateRgn( hwnd, hrgn, erase ) == ERROR) return FALSE;
 559             GetRgnBox32( hrgn, rect );
 560             DeleteObject32( hrgn );
 561         }
 562         else SetRectEmpty32( rect );
 563     }
 564     return (wndPtr->hrgnUpdate > 1);
 565 }
 566
 567
 568 /***********************************************************************
 569  *           GetUpdateRgn   (USER.237) (USER32.297)
 570  */
 571 INT16 GetUpdateRgn( HWND32 hwnd, HRGN32 hrgn, BOOL32 erase )
 572 {
 573     INT32 retval;
 574     WND * wndPtr = WIN_FindWndPtr( hwnd );
 575     if (!wndPtr) return ERROR;
 576
 577     if (wndPtr->hrgnUpdate <= 1)
 578     {
 579         SetRectRgn( hrgn, 0, 0, 0, 0 );
 580         return NULLREGION;
 581     }
 582     retval = CombineRgn32( hrgn, wndPtr->hrgnUpdate, 0, RGN_COPY );
 583     if (erase) RedrawWindow32( hwnd, NULL, 0, RDW_ERASENOW | RDW_NOCHILDREN );
 584     return retval;
 585 }
 586
 587
 588 /***********************************************************************
 589  *           ExcludeUpdateRgn   (USER.238) (USER32.194)
 590  */
 591 INT16 ExcludeUpdateRgn( HDC32 hdc, HWND32 hwnd )
 592 {
 593     RECT16 rect;
 594     WND * wndPtr;
 595
 596     if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return ERROR;
 597
 598     if (wndPtr->hrgnUpdate)
 599     {
 600         INT16  ret;
 601         HRGN32 hrgn = CreateRectRgn32(wndPtr->rectWindow.left - wndPtr->rectClient.left,
 602                                       wndPtr->rectWindow.top - wndPtr->rectClient.top,
 603                                       wndPtr->rectClient.right - wndPtr->rectClient.left,
 604                                       wndPtr->rectClient.bottom - wndPtr->rectClient.top);
 605         if( wndPtr->hrgnUpdate > 1 )
 606             CombineRgn32(hrgn, wndPtr->hrgnUpdate, 0, RGN_COPY);
 607
 608         /* do ugly coordinate translations in dce.c */
 609
 610         ret = DCE_ExcludeRgn( hdc, wndPtr, hrgn );
 611         DeleteObject32( hrgn );
 612         return ret;
 613     }
 614     return GetClipBox16(hdc, &rect);
 615 }
 616
 617