reactos/subsys/win32k/ntuser/painting.c

   1 /*
   2  *  ReactOS W32 Subsystem
   3  *  Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  *
  19  *  $Id: painting.c,v 1.52 2003/12/23 21:33:25 weiden Exp $
  20  *
  21  *  COPYRIGHT:        See COPYING in the top level directory
  22  *  PROJECT:          ReactOS kernel
  23  *  PURPOSE:          Window painting function
  24  *  FILE:             subsys/win32k/ntuser/painting.c
  25  *  PROGRAMER:        Filip Navara (xnavara@volny.cz)
  26  *  REVISION HISTORY:
  27  *       06/06/2001   Created (?)
  28  *       18/11/2003   Complete rewrite
  29  */
  30
  31 /* INCLUDES ******************************************************************/
  32
  33 #include <ddk/ntddk.h>
  34 #include <internal/safe.h>
  35 #include <win32k/win32k.h>
  36 #include <include/object.h>
  37 #include <include/guicheck.h>
  38 #include <include/window.h>
  39 #include <include/desktop.h>
  40 #include <include/winpos.h>
  41 #include <include/class.h>
  42 #include <include/caret.h>
  43 #include <include/error.h>
  44 #include <include/winsta.h>
  45 #include <windows.h>
  46 #include <include/painting.h>
  47 #include <user32/wininternal.h>
  48 #include <include/rect.h>
  49 #include <win32k/coord.h>
  50 #include <win32k/region.h>
  51 #include <include/vis.h>
  52 #include <include/intgdi.h>
  53
  54 #define NDEBUG
  55 #include <debug.h>
  56
  57 /* PRIVATE FUNCTIONS **********************************************************/
  58
  59 VOID FASTCALL
  60 IntValidateParent(PWINDOW_OBJECT Child)
  61 {
  62    HWND Parent;
  63    PWINDOW_OBJECT ParentWindow;
  64
  65    Parent = NtUserGetAncestor(Child->Self, GA_PARENT);
  66    while (Parent && Parent != IntGetDesktopWindow())
  67    {
  68       ParentWindow = IntGetWindowObject(Parent);
  69       if (ParentWindow && !(ParentWindow->Style & WS_CLIPCHILDREN))
  70       {
  71          if (ParentWindow->UpdateRegion != 0)
  72          {
  73             INT OffsetX, OffsetY;
  74
  75             /*
  76              * We must offset the child region by the offset of the
  77              * child rect in the parent.
  78              */
  79             OffsetX = Child->WindowRect.left - ParentWindow->WindowRect.left;
  80             OffsetY = Child->WindowRect.top - ParentWindow->WindowRect.top;
  81             NtGdiOffsetRgn(Child->UpdateRegion, OffsetX, OffsetY );
  82             NtGdiCombineRgn(ParentWindow->UpdateRegion, ParentWindow->UpdateRegion,
  83                Child->UpdateRegion, RGN_DIFF);
  84             /* FIXME: If the resulting region is empty, remove fake posted paint message */
  85             NtGdiOffsetRgn(Child->UpdateRegion, -OffsetX, -OffsetY);
  86          }
  87       }
  88       IntReleaseWindowObject(ParentWindow);
  89       Parent = NtUserGetAncestor(Parent, GA_PARENT);
  90    }
  91 }
  92
  93 /*
  94  * IntGetNCUpdateRegion
  95  *
  96  * Get nonclient part of window update region.
  97  *
  98  * Return Value
  99  *    Handle to region that represents invalid nonclient window area. The
 100  *    caller is responsible for deleting it.
 101  *
 102  * Remarks
 103  *    This function also marks the nonclient update region of window
 104  *    as valid, clears the WINDOWOBJECT_NEED_NCPAINT flag and removes
 105  *    the fake paint message from message queue if the Remove is set
 106  *    to TRUE.
 107  */
 108
 109 HRGN FASTCALL
 110 IntGetNCUpdateRegion(PWINDOW_OBJECT Window, BOOL Remove)
 111 {
 112    HRGN WindowRgn;
 113    HRGN NonclientRgn;
 114
 115    WindowRgn = UnsafeIntCreateRectRgnIndirect(&Window->ClientRect);
 116    NtGdiOffsetRgn(WindowRgn,
 117       -Window->WindowRect.left,
 118       -Window->WindowRect.top);
 119    NonclientRgn = NtGdiCreateRectRgn(0, 0, 0, 0);
 120    if (NtGdiCombineRgn(NonclientRgn, Window->UpdateRegion,
 121        WindowRgn, RGN_DIFF) == NULLREGION)
 122    {
 123       NtGdiDeleteObject(NonclientRgn);
 124       NonclientRgn = NULL;
 125    }
 126    if (Remove)
 127    {
 128       if (NtGdiCombineRgn(Window->UpdateRegion, Window->UpdateRegion,
 129           WindowRgn, RGN_AND) == NULLREGION)
 130       {
 131          NtGdiDeleteObject(Window->UpdateRegion);
 132          Window->UpdateRegion = NULL;
 133       }
 134       Window->Flags &= ~WINDOWOBJECT_NEED_NCPAINT;
 135       MsqDecPaintCountQueue(Window->MessageQueue);
 136    }
 137
 138    return NonclientRgn;
 139 }
 140
 141 /*
 142  * IntPaintWindows
 143  *
 144  * Internal function used by IntRedrawWindow.
 145  */
 146
 147 VOID FASTCALL
 148 IntPaintWindows(PWINDOW_OBJECT Window, ULONG Flags)
 149 {
 150   HDC hDC;
 151   HWND hWnd = Window->Self;
 152
 153   if (! (Window->Style & WS_VISIBLE))
 154     {
 155       return;
 156     }
 157
 158   if (Flags & (RDW_ERASENOW | RDW_UPDATENOW))
 159     {
 160       if (Window->Flags & WINDOWOBJECT_NEED_NCPAINT)
 161         {
 162           IntSendMessage(hWnd, WM_NCPAINT, (WPARAM)IntGetNCUpdateRegion(Window, TRUE), 0, TRUE);
 163         }
 164
 165       if (Window->Flags & WINDOWOBJECT_NEED_ERASEBKGND)
 166         {
 167           if (Window->UpdateRegion)
 168             {
 169               hDC = NtUserGetDCEx(hWnd, 0, DCX_CACHE | DCX_USESTYLE |
 170                                            DCX_INTERSECTUPDATE);
 171               if (hDC != NULL)
 172                 {
 173                   if (IntSendMessage(hWnd, WM_ERASEBKGND, (WPARAM)hDC, 0, TRUE))
 174                     {
 175                       Window->Flags &= ~WINDOWOBJECT_NEED_ERASEBKGND;
 176                     }
 177                   NtUserReleaseDC(hWnd, hDC);
 178                 }
 179             }
 180         }
 181
 182       if (Flags & RDW_UPDATENOW)
 183         {
 184           if (Window->UpdateRegion != NULL ||
 185               Window->Flags & WINDOWOBJECT_NEED_INTERNALPAINT)
 186             {
 187               IntSendMessage(hWnd, WM_PAINT, 0, 0, TRUE);
 188               if (Window->Flags & WINDOWOBJECT_NEED_INTERNALPAINT)
 189                 {
 190                   Window->Flags &= ~WINDOWOBJECT_NEED_INTERNALPAINT;
 191                   if (Window->UpdateRegion == NULL)
 192                     {
 193                       MsqDecPaintCountQueue(Window->MessageQueue);
 194                     }
 195                 }
 196             }
 197         }
 198     }
 199
 200   /*
 201    * Check that the window is still valid at this point
 202    */
 203
 204   if (! IntIsWindow(hWnd))
 205     {
 206       return;
 207     }
 208
 209   /*
 210    * Paint child windows.
 211    */
 212   if (!(Flags & RDW_NOCHILDREN) && !(Window->Style & WS_MINIMIZE) &&
 213       ((Flags & RDW_ALLCHILDREN) || !(Window->Style & WS_CLIPCHILDREN)) &&
 214       ! IntIsDesktopWindow(Window))
 215     {
 216       HWND *List, *phWnd;
 217
 218       if ((List = IntWinListChildren(Window)))
 219         {
 220           for (phWnd = List; *phWnd; ++phWnd)
 221             {
 222               Window = IntGetWindowObject(*phWnd);
 223               if (Window)
 224                 {
 225                   IntPaintWindows(Window, Flags);
 226                   IntReleaseWindowObject(Window);
 227                 }
 228             }
 229           ExFreePool(List);
 230         }
 231     }
 232 }
 233
 234 /*
 235  * IntInvalidateWindows
 236  *
 237  * Internal function used by IntRedrawWindow.
 238  */
 239
 240 VOID FASTCALL
 241 IntInvalidateWindows(PWINDOW_OBJECT Window, HRGN hRgn, ULONG Flags,
 242    BOOL ValidateParent)
 243 {
 244    INT RgnType;
 245    BOOL HadPaintMessage, HadNCPaintMessage;
 246    BOOL HasPaintMessage, HasNCPaintMessage;
 247    HRGN hRgnWindow;
 248
 249    /*
 250     * Clip the given region with window rectangle (or region)
 251     */
 252
 253 #ifdef TODO
 254    if (!Window->WindowRegion)
 255 #endif
 256    {
 257       hRgnWindow = UnsafeIntCreateRectRgnIndirect(&Window->WindowRect);
 258       NtGdiOffsetRgn(hRgnWindow,
 259          -Window->WindowRect.left,
 260          -Window->WindowRect.top);
 261       RgnType = NtGdiCombineRgn(hRgn, hRgn, hRgnWindow, RGN_AND);
 262       NtGdiDeleteObject(hRgnWindow);
 263    }
 264 #ifdef TODO
 265    else
 266    {
 267       RgnType = NtGdiCombineRgn(hRgn, hRgn, Window->WindowRegion, RGN_AND);
 268    }
 269 #endif
 270
 271    /*
 272     * Save current state of pending updates
 273     */
 274
 275    HadPaintMessage = Window->UpdateRegion != NULL ||
 276       Window->Flags & WINDOWOBJECT_NEED_INTERNALPAINT;
 277    HadNCPaintMessage = Window->Flags & WINDOWOBJECT_NEED_NCPAINT;
 278
 279    /*
 280     * Update the region and flags
 281     */
 282
 283    if (Flags & RDW_INVALIDATE && RgnType != NULLREGION)
 284    {
 285       if (Window->UpdateRegion == NULL)
 286       {
 287          Window->UpdateRegion = NtGdiCreateRectRgn(0, 0, 0, 0);
 288       }
 289
 290       if (NtGdiCombineRgn(Window->UpdateRegion, Window->UpdateRegion,
 291           hRgn, RGN_OR) == NULLREGION)
 292       {
 293          NtGdiDeleteObject(Window->UpdateRegion);
 294          Window->UpdateRegion = NULL;
 295       }
 296
 297       if (Flags & RDW_FRAME)
 298          Window->Flags |= WINDOWOBJECT_NEED_NCPAINT;
 299       if (Flags & RDW_ERASE)
 300          Window->Flags |= WINDOWOBJECT_NEED_ERASEBKGND;
 301
 302       Flags |= RDW_FRAME;
 303    }
 304
 305    if (Flags & RDW_VALIDATE && RgnType != NULLREGION)
 306    {
 307       if (Window->UpdateRegion != NULL)
 308       {
 309          if (NtGdiCombineRgn(Window->UpdateRegion, Window->UpdateRegion,
 310              hRgn, RGN_DIFF) == NULLREGION)
 311          {
 312             NtGdiDeleteObject(Window->UpdateRegion);
 313             Window->UpdateRegion = NULL;
 314          }
 315       }
 316
 317       if (Window->UpdateRegion == NULL)
 318          Window->Flags &= ~WINDOWOBJECT_NEED_ERASEBKGND;
 319       if (Flags & RDW_NOFRAME)
 320          Window->Flags &= ~WINDOWOBJECT_NEED_NCPAINT;
 321       if (Flags & RDW_NOERASE)
 322          Window->Flags &= ~WINDOWOBJECT_NEED_ERASEBKGND;
 323    }
 324
 325    if (Flags & RDW_INTERNALPAINT)
 326    {
 327       Window->Flags |= WINDOWOBJECT_NEED_INTERNALPAINT;
 328    }
 329
 330    if (Flags & RDW_NOINTERNALPAINT)
 331    {
 332       Window->Flags &= ~WINDOWOBJECT_NEED_INTERNALPAINT;
 333    }
 334
 335    /*
 336     * Validate parent covered by region
 337     */
 338
 339    if (ValidateParent)
 340    {
 341       IntValidateParent(Window);
 342    }
 343
 344    /*
 345     * Process children if needed
 346     */
 347
 348    if (!(Flags & RDW_NOCHILDREN) && !(Window->Style & WS_MINIMIZE) &&
 349        ((Flags & RDW_ALLCHILDREN) || !(Window->Style & WS_CLIPCHILDREN)))
 350    {
 351       HWND *List, *phWnd;
 352       PWINDOW_OBJECT Child;
 353
 354       if ((List = IntWinListChildren(Window)))
 355       {
 356          for (phWnd = List; *phWnd; ++phWnd)
 357          {
 358             Child = IntGetWindowObject(*phWnd);
 359             if(!Child)
 360             {
 361               continue;
 362             }
 363             if ((Child->Style & (WS_VISIBLE | WS_MINIMIZE)) == WS_VISIBLE)
 364             {
 365                /*
 366                 * Recursive call to update children UpdateRegion
 367                 */
 368                HRGN hRgnTemp = NtGdiCreateRectRgn(0, 0, 0, 0);
 369                NtGdiCombineRgn(hRgnTemp, hRgn, 0, RGN_COPY);
 370                NtGdiOffsetRgn(hRgnTemp,
 371                   Window->WindowRect.left - Child->WindowRect.left,
 372                   Window->WindowRect.top - Child->WindowRect.top);
 373                IntInvalidateWindows(Child, hRgnTemp, Flags, FALSE);
 374
 375                /*
 376                 * Update our UpdateRegion depending on children
 377                 */
 378                NtGdiCombineRgn(hRgnTemp, Child->UpdateRegion, 0, RGN_COPY);
 379                NtGdiOffsetRgn(hRgnTemp,
 380                   Child->WindowRect.left - Window->WindowRect.left,
 381                   Child->WindowRect.top - Window->WindowRect.top);
 382                hRgnWindow = UnsafeIntCreateRectRgnIndirect(&Window->ClientRect);
 383                NtGdiOffsetRgn(hRgnWindow,
 384                   -Window->WindowRect.left,
 385                   -Window->WindowRect.top);
 386                NtGdiCombineRgn(hRgnTemp, hRgnTemp, hRgnWindow, RGN_AND);
 387                if (NtGdiCombineRgn(Window->UpdateRegion, Window->UpdateRegion,
 388                    hRgnTemp, RGN_DIFF) == NULLREGION)
 389                {
 390                   NtGdiDeleteObject(Window->UpdateRegion);
 391                   Window->UpdateRegion = NULL;
 392                }
 393                NtGdiDeleteObject(hRgnTemp);
 394             }
 395             IntReleaseWindowObject(Child);
 396          }
 397          ExFreePool(List);
 398       }
 399    }
 400
 401    /*
 402     * Fake post paint messages to window message queue if needed
 403     */
 404    HasPaintMessage = Window->UpdateRegion != NULL ||
 405          Window->Flags & WINDOWOBJECT_NEED_INTERNALPAINT;
 406    HasNCPaintMessage = Window->Flags & WINDOWOBJECT_NEED_NCPAINT;
 407
 408    if (HasPaintMessage != HadPaintMessage)
 409    {
 410       if (HadPaintMessage)
 411          MsqDecPaintCountQueue(Window->MessageQueue);
 412       else
 413          MsqIncPaintCountQueue(Window->MessageQueue);
 414    }
 415
 416    if (HasNCPaintMessage != HadNCPaintMessage)
 417    {
 418       if (HadNCPaintMessage)
 419          MsqDecPaintCountQueue(Window->MessageQueue);
 420       else
 421          MsqIncPaintCountQueue(Window->MessageQueue);
 422    }
 423 }
 424
 425 /*
 426  * IntIsWindowDrawable
 427  *
 428  * Remarks
 429  *    Window is drawable when it is visible, all parents are not
 430  *    minimized, and it is itself not minimized.
 431  */
 432
 433 BOOL FASTCALL
 434 IntIsWindowDrawable(PWINDOW_OBJECT Window)
 435 {
 436    for (; Window; Window = Window->Parent)
 437    {
 438       if ((Window->Style & (WS_VISIBLE | WS_MINIMIZE)) != WS_VISIBLE)
 439          return FALSE;
 440    }
 441
 442    return TRUE;
 443 }
 444
 445 /*
 446  * IntRedrawWindow
 447  *
 448  * Internal version of NtUserRedrawWindow that takes WINDOW_OBJECT as
 449  * first parameter.
 450  */
 451
 452 BOOL FASTCALL
 453 IntRedrawWindow(PWINDOW_OBJECT Window, const RECT* UpdateRect, HRGN UpdateRgn,
 454    ULONG Flags)
 455 {
 456    HRGN hRgn = NULL;
 457
 458    /*
 459     * Step 1.
 460     * Validation of passed parameters.
 461     */
 462
 463    if (!IntIsWindowDrawable(Window) ||
 464        (Flags & (RDW_VALIDATE | RDW_INVALIDATE)) ==
 465        (RDW_VALIDATE | RDW_INVALIDATE))
 466    {
 467       return FALSE;
 468    }
 469
 470    /*
 471     * Step 2.
 472     * Transform the parameters UpdateRgn and UpdateRect into
 473     * a region hRgn specified in window coordinates.
 474     */
 475
 476    if (Flags & (RDW_INVALIDATE | RDW_VALIDATE))
 477    {
 478       if (UpdateRgn != NULL)
 479       {
 480          hRgn = NtGdiCreateRectRgn(0, 0, 0, 0);
 481          NtGdiCombineRgn(hRgn, UpdateRgn, NULL, RGN_COPY);
 482          NtGdiOffsetRgn(hRgn,
 483             Window->ClientRect.left - Window->WindowRect.left,
 484             Window->ClientRect.top - Window->WindowRect.top);
 485       } else
 486       if (UpdateRect != NULL)
 487       {
 488          hRgn = UnsafeIntCreateRectRgnIndirect((RECT *)UpdateRect);
 489          NtGdiOffsetRgn(hRgn,
 490             Window->ClientRect.left - Window->WindowRect.left,
 491             Window->ClientRect.top - Window->WindowRect.top);
 492       } else
 493       if ((Flags & (RDW_INVALIDATE | RDW_FRAME)) == (RDW_INVALIDATE | RDW_FRAME) ||
 494           (Flags & (RDW_VALIDATE | RDW_NOFRAME)) == (RDW_VALIDATE | RDW_NOFRAME))
 495       {
 496          hRgn = UnsafeIntCreateRectRgnIndirect(&Window->WindowRect);
 497          NtGdiOffsetRgn(hRgn,
 498             -Window->WindowRect.left,
 499             -Window->WindowRect.top);
 500       }
 501       else
 502       {
 503          hRgn = UnsafeIntCreateRectRgnIndirect(&Window->ClientRect);
 504          NtGdiOffsetRgn(hRgn,
 505             -Window->WindowRect.left,
 506             -Window->WindowRect.top);
 507       }
 508    }
 509
 510    /*
 511     * Step 3.
 512     * Adjust the window update region depending on hRgn and flags.
 513     */
 514
 515    if (Flags & (RDW_INVALIDATE | RDW_VALIDATE | RDW_INTERNALPAINT | RDW_NOINTERNALPAINT))
 516    {
 517       IntInvalidateWindows(Window, hRgn, Flags, TRUE);
 518    } else
 519    if (Window->UpdateRegion != NULL && Flags & RDW_ERASENOW)
 520    {
 521       /* Validate parent covered by region. */
 522       IntValidateParent(Window);
 523    }
 524
 525    /*
 526     * Step 4.
 527     * Repaint and erase windows if needed.
 528     */
 529
 530    if (Flags & (RDW_ERASENOW | RDW_UPDATENOW))
 531    {
 532       IntPaintWindows(Window, Flags);
 533    }
 534
 535    /*
 536     * Step 5.
 537     * Cleanup ;-)
 538     */
 539
 540    if (NULL != hRgn)
 541    {
 542       NtGdiDeleteObject(hRgn);
 543    }
 544
 545    return TRUE;
 546 }
 547
 548 HWND STDCALL
 549 IntFindWindowToRepaint(HWND hWnd, PW32THREAD Thread)
 550 {
 551    PWINDOW_OBJECT Window;
 552    PWINDOW_OBJECT Child;
 553    HWND hFoundWnd = NULL;
 554
 555    if (hWnd == NULL)
 556    {
 557       PLIST_ENTRY CurrentEntry;
 558
 559       ExAcquireFastMutex(&Thread->WindowListLock);
 560
 561       for (CurrentEntry = Thread->WindowListHead.Flink;
 562            CurrentEntry != &Thread->WindowListHead;
 563            CurrentEntry = CurrentEntry->Flink)
 564       {
 565          Window = CONTAINING_RECORD(CurrentEntry, WINDOW_OBJECT, ThreadListEntry);
 566          if (Window->Parent != NULL && !IntIsDesktopWindow(Window->Parent))
 567          {
 568             continue;
 569          }
 570          if (Window->Style & WS_VISIBLE)
 571          {
 572             hFoundWnd = IntFindWindowToRepaint(Window->Self, Thread);
 573             if (hFoundWnd != NULL)
 574             {
 575                 ExReleaseFastMutex(&Thread->WindowListLock);
 576                 return hFoundWnd;
 577             }
 578          }
 579       }
 580
 581       ExReleaseFastMutex(&Thread->WindowListLock);
 582       return NULL;
 583    }
 584    else
 585    {
 586       Window = IntGetWindowObject(hWnd);
 587       if (Window == NULL)
 588          return NULL;
 589
 590       if ((Window->UpdateRegion != NULL ||
 591           Window->Flags & (WINDOWOBJECT_NEED_INTERNALPAINT | WINDOWOBJECT_NEED_NCPAINT)) &&
 592           IntWndBelongsToThread(Window, Thread))
 593       {
 594          IntReleaseWindowObject(Window);
 595          return hWnd;
 596       }
 597
 598       ExAcquireFastMutex(&Window->ChildrenListLock);
 599
 600       for (Child = Window->FirstChild; Child; Child = Child->NextSibling)
 601       {
 602          if (Child->Style & WS_VISIBLE &&
 603              (Child->UpdateRegion != NULL ||
 604               Child->Flags & WINDOWOBJECT_NEED_INTERNALPAINT ||
 605               Child->Flags & WINDOWOBJECT_NEED_NCPAINT))
 606          {
 607             hFoundWnd = Child->Self;
 608             break;
 609          }
 610       }
 611
 612       if (hFoundWnd == NULL)
 613       {
 614          for (Child = Window->FirstChild; Child; Child = Child->NextSibling)
 615          {
 616             if (Child->Style & WS_VISIBLE)
 617             {
 618                hFoundWnd = IntFindWindowToRepaint(Child->Self, Thread);
 619                if (hFoundWnd != NULL)
 620                   break;
 621             }
 622          }
 623       }
 624
 625       ExReleaseFastMutex(&Window->ChildrenListLock);
 626       IntReleaseWindowObject(Window);
 627
 628       return hFoundWnd;
 629    }
 630 }
 631
 632 BOOL FASTCALL
 633 IntGetPaintMessage(HWND hWnd, PW32THREAD Thread, MSG *Message,
 634    BOOL Remove)
 635 {
 636    PWINDOW_OBJECT Window;
 637    PUSER_MESSAGE_QUEUE MessageQueue = (PUSER_MESSAGE_QUEUE)Thread->MessageQueue;
 638
 639    if (!MessageQueue->PaintPosted)
 640       return FALSE;
 641
 642    if (hWnd)
 643       Message->hwnd = IntFindWindowToRepaint(hWnd, PsGetWin32Thread());
 644    else
 645       Message->hwnd = IntFindWindowToRepaint(NULL, PsGetWin32Thread());
 646
 647    if (Message->hwnd == NULL)
 648    {
 649 #if 0
 650       DPRINT1("PAINTING BUG: Thread marked as containing dirty windows, but no dirty windows found!\n");
 651       /* FIXME: Lock the queue! */
 652       MessageQueue->PaintPosted = 0;
 653       MessageQueue->PaintCount = 0;
 654 #endif
 655       return FALSE;
 656    }
 657
 658    Window = IntGetWindowObject(Message->hwnd);
 659    if (Window != NULL)
 660    {
 661       if (Window->Flags & WINDOWOBJECT_NEED_NCPAINT)
 662       {
 663          Message->message = WM_NCPAINT;
 664          Message->wParam = (WPARAM)IntGetNCUpdateRegion(Window, Remove);
 665          Message->lParam = 0;
 666       } else
 667       {
 668          Message->message = WM_PAINT;
 669          Message->wParam = Message->lParam = 0;
 670          if (Remove && Window->Flags & WINDOWOBJECT_NEED_INTERNALPAINT)
 671          {
 672             Window->Flags &= ~WINDOWOBJECT_NEED_INTERNALPAINT;
 673             if (Window->UpdateRegion == NULL)
 674             {
 675                MsqDecPaintCountQueue(Window->MessageQueue);
 676             }
 677          }
 678       }
 679
 680       IntReleaseWindowObject(Window);
 681       return TRUE;
 682    }
 683
 684    return FALSE;
 685 }
 686
 687 HWND FASTCALL
 688 IntFixCaret(HWND hWnd, LPRECT lprc, UINT flags)
 689 {
 690    GUITHREADINFO info;
 691
 692    if (!NtUserGetGUIThreadInfo(0, &info))
 693       return 0;
 694    if (!info.hwndCaret)
 695       return 0;
 696    if (info.hwndCaret == hWnd ||
 697        ((flags & SW_SCROLLCHILDREN) && IntIsChildWindow(hWnd, info.hwndCaret)))
 698    {
 699       POINT pt, FromOffset, ToOffset, Offset;
 700
 701       pt.x = info.rcCaret.left;
 702       pt.y = info.rcCaret.top;
 703
 704       IntGetClientOrigin(info.hwndCaret, &FromOffset);
 705       IntGetClientOrigin(hWnd, &ToOffset);
 706       Offset.x = FromOffset.x - ToOffset.x;
 707       Offset.y = FromOffset.y - ToOffset.y;
 708       info.rcCaret.left += Offset.x;
 709       info.rcCaret.top += Offset.y;
 710       info.rcCaret.right += Offset.x;
 711       info.rcCaret.bottom += Offset.y;
 712       if (NtGdiIntersectRect(lprc, lprc, &info.rcCaret))
 713       {
 714          NtUserHideCaret(0);
 715          lprc->left = pt.x;
 716          lprc->top = pt.y;
 717          return info.hwndCaret;
 718       }
 719    }
 720
 721    return 0;
 722 }
 723
 724 /* PUBLIC FUNCTIONS ***********************************************************/
 725
 726 /*
 727  * NtUserBeginPaint
 728  *
 729  * Status
 730  *    @implemented
 731  */
 732
 733 HDC STDCALL
 734 NtUserBeginPaint(HWND hWnd, PAINTSTRUCT* lPs)
 735 {
 736    PWINDOW_OBJECT Window;
 737    RECT ClientRect;
 738    RECT ClipRect;
 739    INT DcxFlags;
 740
 741    if (!(Window = IntGetWindowObject(hWnd)))
 742    {
 743       SetLastWin32Error(ERROR_INVALID_WINDOW_HANDLE);
 744       return NULL;
 745    }
 746
 747    NtUserHideCaret(hWnd);
 748
 749    DcxFlags = DCX_INTERSECTUPDATE | DCX_WINDOWPAINT | DCX_USESTYLE;
 750
 751    lPs->hdc = NtUserGetDCEx(hWnd, 0, DcxFlags);
 752
 753    if (!lPs->hdc)
 754    {
 755       IntReleaseWindowObject(Window);
 756       return NULL;
 757    }
 758
 759 /*   IntRedrawWindow(Window, NULL, 0, RDW_NOINTERNALPAINT | RDW_VALIDATE | RDW_NOCHILDREN);*/
 760    if (Window->UpdateRegion != NULL)
 761    {
 762       MsqDecPaintCountQueue(Window->MessageQueue);
 763       IntValidateParent(Window);
 764       NtGdiDeleteObject(Window->UpdateRegion);
 765       Window->UpdateRegion = NULL;
 766    }
 767
 768    IntGetClientRect(Window, &ClientRect);
 769    IntGdiGetClipBox(lPs->hdc, &ClipRect);
 770    NtGdiLPtoDP(lPs->hdc, (LPPOINT)&ClipRect, 2);
 771    NtGdiIntersectRect(&lPs->rcPaint, &ClientRect, &ClipRect);
 772    NtGdiDPtoLP(lPs->hdc, (LPPOINT)&lPs->rcPaint, 2);
 773
 774    if (Window->Flags & WINDOWOBJECT_NEED_ERASEBKGND)
 775    {
 776       Window->Flags &= ~WINDOWOBJECT_NEED_ERASEBKGND;
 777       lPs->fErase = !IntSendMessage(hWnd, WM_ERASEBKGND, (WPARAM)lPs->hdc, 0, TRUE);
 778    }
 779    else
 780    {
 781       lPs->fErase = FALSE;
 782    }
 783
 784    IntReleaseWindowObject(Window);
 785
 786    return lPs->hdc;
 787 }
 788
 789 /*
 790  * NtUserEndPaint
 791  *
 792  * Status
 793  *    @implemented
 794  */
 795
 796 BOOL STDCALL
 797 NtUserEndPaint(HWND hWnd, CONST PAINTSTRUCT* lPs)
 798 {
 799    NtUserReleaseDC(hWnd, lPs->hdc);
 800    NtUserShowCaret(hWnd);
 801
 802    return TRUE;
 803 }
 804
 805 /*
 806  * NtUserInvalidateRect
 807  *
 808  * Status
 809  *    @implemented
 810  */
 811
 812 DWORD STDCALL
 813 NtUserInvalidateRect(HWND hWnd, CONST RECT *Rect, BOOL Erase)
 814 {
 815    return NtUserRedrawWindow(hWnd, Rect, 0, RDW_INVALIDATE | (Erase ? RDW_ERASE : 0));
 816 }
 817
 818 /*
 819  * NtUserInvalidateRgn
 820  *
 821  * Status
 822  *    @implemented
 823  */
 824
 825 DWORD STDCALL
 826 NtUserInvalidateRgn(HWND hWnd, HRGN Rgn, BOOL Erase)
 827 {
 828    return NtUserRedrawWindow(hWnd, NULL, Rgn, RDW_INVALIDATE | (Erase ? RDW_ERASE : 0));
 829 }
 830
 831 /*
 832  * NtUserValidateRgn
 833  *
 834  * Status
 835  *    @implemented
 836  */
 837
 838 BOOL STDCALL
 839 NtUserValidateRgn(HWND hWnd, HRGN hRgn)
 840 {
 841    return NtUserRedrawWindow(hWnd, NULL, hRgn, RDW_VALIDATE | RDW_NOCHILDREN);
 842 }
 843
 844 /*
 845  * NtUserUpdateWindow
 846  *
 847  * Status
 848  *    @implemented
 849  */
 850
 851 BOOL STDCALL
 852 NtUserUpdateWindow(HWND hWnd)
 853 {
 854    return NtUserRedrawWindow(hWnd, NULL, 0, RDW_UPDATENOW | RDW_ALLCHILDREN);
 855 }
 856
 857 /*
 858  * NtUserGetUpdateRgn
 859  *
 860  * Status
 861  *    @implemented
 862  */
 863
 864 INT STDCALL
 865 NtUserGetUpdateRgn(HWND hWnd, HRGN hRgn, BOOL bErase)
 866 {
 867    PWINDOW_OBJECT Window;
 868    int RegionType;
 869
 870    if (!(Window = IntGetWindowObject(hWnd)))
 871    {
 872       SetLastWin32Error(ERROR_INVALID_WINDOW_HANDLE);
 873       return ERROR;
 874    }
 875
 876    if (Window->UpdateRegion == NULL)
 877    {
 878       RegionType = (NtGdiSetRectRgn(hRgn, 0, 0, 0, 0) ? NULLREGION : ERROR);
 879    }
 880    else
 881    {
 882       RegionType = NtGdiCombineRgn(hRgn, Window->UpdateRegion, hRgn, RGN_COPY);
 883       NtGdiOffsetRgn(
 884          hRgn,
 885          Window->WindowRect.left - Window->ClientRect.left,
 886          Window->WindowRect.top - Window->ClientRect.top);
 887    }
 888
 889    IntReleaseWindowObject(Window);
 890
 891    if (bErase && RegionType != NULLREGION && RegionType != ERROR)
 892    {
 893       NtUserRedrawWindow(hWnd, NULL, NULL, RDW_ERASENOW | RDW_NOCHILDREN);
 894    }
 895
 896    return RegionType;
 897 }
 898
 899 /*
 900  * NtUserGetUpdateRect
 901  *
 902  * Status
 903  *    @implemented
 904  */
 905
 906 BOOL STDCALL
 907 NtUserGetUpdateRect(HWND hWnd, LPRECT lpRect, BOOL fErase)
 908 {
 909    HRGN hRgn = NtGdiCreateRectRgn(0, 0, 0, 0);
 910
 911    if (!lpRect)
 912    {
 913       SetLastWin32Error(ERROR_INVALID_PARAMETER);
 914       return FALSE;
 915    }
 916
 917    NtUserGetUpdateRgn(hWnd, hRgn, fErase);
 918    NtGdiGetRgnBox(hRgn, lpRect);
 919
 920    return lpRect->left < lpRect->right && lpRect->top < lpRect->bottom;
 921 }
 922
 923 /*
 924  * NtUserRedrawWindow
 925  *
 926  * Status
 927  *    @implemented
 928  */
 929
 930 BOOL STDCALL
 931 NtUserRedrawWindow(HWND hWnd, CONST RECT *lprcUpdate, HRGN hrgnUpdate,
 932    UINT flags)
 933 {
 934    RECT SafeUpdateRect;
 935    NTSTATUS Status;
 936    PWINDOW_OBJECT Wnd;
 937
 938    if (!(Wnd = IntGetWindowObject(hWnd ? hWnd : IntGetDesktopWindow())))
 939    {
 940       SetLastWin32Error(ERROR_INVALID_WINDOW_HANDLE);
 941       return FALSE;
 942    }
 943
 944    if (lprcUpdate != NULL)
 945    {
 946       Status = MmCopyFromCaller(&SafeUpdateRect, (PRECT)lprcUpdate,
 947          sizeof(RECT));
 948
 949       if (!NT_SUCCESS(Status))
 950       {
 951          SetLastWin32Error(ERROR_INVALID_PARAMETER);
 952          return FALSE;
 953       }
 954    }
 955
 956    Status = IntRedrawWindow(Wnd, NULL == lprcUpdate ? NULL : &SafeUpdateRect,
 957       hrgnUpdate, flags);
 958
 959    if (!NT_SUCCESS(Status))
 960    {
 961       /* IntRedrawWindow fails only in case that flags are invalid */
 962       SetLastWin32Error(ERROR_INVALID_PARAMETER);
 963       return FALSE;
 964    }
 965
 966    return TRUE;
 967 }
 968
 969 /*
 970  * NtUserScrollDC
 971  *
 972  * Status
 973  *    @implemented
 974  */
 975
 976 DWORD STDCALL
 977 NtUserScrollDC(HDC hDC, INT dx, INT dy, const RECT *lprcScroll,
 978    const RECT *lprcClip, HRGN hrgnUpdate, LPRECT lprcUpdate)
 979 {
 980    RECT rSrc, rClipped_src, rClip, rDst, offset;
 981
 982    /*
 983     * Compute device clipping region (in device coordinates).
 984     */
 985
 986    if (lprcScroll)
 987       rSrc = *lprcScroll;
 988    else
 989       IntGdiGetClipBox(hDC, &rSrc);
 990    NtGdiLPtoDP(hDC, (LPPOINT)&rSrc, 2);
 991
 992    if (lprcClip)
 993       rClip = *lprcClip;
 994    else
 995       IntGdiGetClipBox(hDC, &rClip);
 996    NtGdiLPtoDP(hDC, (LPPOINT)&rClip, 2);
 997
 998    NtGdiIntersectRect(&rClipped_src, &rSrc, &rClip);
 999
1000    rDst = rClipped_src;
1001    NtGdiSetRect(&offset, 0, 0, dx, dy);
1002    NtGdiLPtoDP(hDC, (LPPOINT)&offset, 2);
1003    NtGdiOffsetRect(&rDst, offset.right - offset.left,  offset.bottom - offset.top);
1004    NtGdiIntersectRect(&rDst, &rDst, &rClip);
1005
1006    /*
1007     * Copy bits, if possible.
1008     */
1009
1010    if (rDst.bottom > rDst.top && rDst.right > rDst.left)
1011    {
1012       RECT rDst_lp = rDst, rSrc_lp = rDst;
1013
1014       NtGdiOffsetRect(&rSrc_lp, offset.left - offset.right, offset.top - offset.bottom);
1015       NtGdiDPtoLP(hDC, (LPPOINT)&rDst_lp, 2);
1016       NtGdiDPtoLP(hDC, (LPPOINT)&rSrc_lp, 2);
1017
1018       if (!NtGdiBitBlt(hDC, rDst_lp.left, rDst_lp.top, rDst_lp.right - rDst_lp.left,
1019                        rDst_lp.bottom - rDst_lp.top, hDC, rSrc_lp.left, rSrc_lp.top,
1020                        SRCCOPY))
1021          return FALSE;
1022    }
1023
1024    /*
1025     * Compute update areas.  This is the clipped source or'ed with the
1026     * unclipped source translated minus the clipped src translated (rDst)
1027     * all clipped to rClip.
1028     */
1029
1030    if (hrgnUpdate || lprcUpdate)
1031    {
1032       HRGN hRgn = hrgnUpdate, hRgn2;
1033
1034       if (hRgn)
1035          NtGdiSetRectRgn(hRgn, rClipped_src.left, rClipped_src.top, rClipped_src.right, rClipped_src.bottom);
1036       else
1037          hRgn = NtGdiCreateRectRgn(rClipped_src.left, rClipped_src.top, rClipped_src.right, rClipped_src.bottom);
1038
1039       hRgn2 = NtGdiCreateRectRgnIndirect(&rSrc);
1040       NtGdiOffsetRgn(hRgn2, offset.right - offset.left,  offset.bottom - offset.top);
1041       NtGdiCombineRgn(hRgn, hRgn, hRgn2, RGN_OR);
1042
1043       NtGdiSetRectRgn(hRgn2, rDst.left, rDst.top, rDst.right, rDst.bottom);
1044       NtGdiCombineRgn(hRgn, hRgn, hRgn2, RGN_DIFF);
1045
1046       NtGdiSetRectRgn(hRgn2, rClip.left, rClip.top, rClip.right, rClip.bottom);
1047       NtGdiCombineRgn(hRgn, hRgn, hRgn2, RGN_AND);
1048
1049       if (lprcUpdate)
1050       {
1051          NtGdiGetRgnBox(hRgn, lprcUpdate);
1052
1053          /* Put the lprcUpdate in logical coordinate */
1054          NtGdiDPtoLP(hDC, (LPPOINT)lprcUpdate, 2);
1055       }
1056       if (!hrgnUpdate)
1057          NtGdiDeleteObject(hRgn);
1058       NtGdiDeleteObject(hRgn2);
1059    }
1060    return TRUE;
1061 }
1062
1063 /*
1064  * NtUserScrollWindowEx
1065  *
1066  * Status
1067  *    @implemented
1068  */
1069
1070 DWORD STDCALL
1071 NtUserScrollWindowEx(HWND hWnd, INT dx, INT dy, const RECT *rect,
1072    const RECT *clipRect, HRGN hrgnUpdate, LPRECT rcUpdate, UINT flags)
1073 {
1074    RECT rc, cliprc, caretrc;
1075    INT Result;
1076    PWINDOW_OBJECT Window;
1077    HDC hDC;
1078    HRGN hrgnTemp;
1079    HWND hwndCaret;
1080    BOOL bUpdate = (rcUpdate || hrgnUpdate || flags & (SW_INVALIDATE | SW_ERASE));
1081    BOOL bOwnRgn = TRUE;
1082
1083    Window = IntGetWindowObject(hWnd);
1084    if (!Window || !IntIsWindowDrawable(Window))
1085    {
1086       IntReleaseWindowObject(Window);
1087       return ERROR;
1088    }
1089
1090    IntGetClientRect(Window, &rc);
1091    if (rect)
1092       NtGdiIntersectRect(&rc, &rc, rect);
1093
1094    if (clipRect)
1095       NtGdiIntersectRect(&cliprc, &rc, clipRect);
1096    else
1097       cliprc = rc;
1098
1099    if (cliprc.right <= cliprc.left || cliprc.bottom <= cliprc.top ||
1100        (dx == 0 && dy == 0))
1101    {
1102       return NULLREGION;
1103    }
1104
1105    caretrc = rc;
1106    hwndCaret = IntFixCaret(hWnd, &caretrc, flags);
1107
1108    if (hrgnUpdate)
1109       bOwnRgn = FALSE;
1110    else if (bUpdate)
1111       hrgnUpdate = NtGdiCreateRectRgn(0, 0, 0, 0);
1112
1113    hDC = NtUserGetDCEx( hWnd, 0, DCX_CACHE | DCX_USESTYLE );
1114    if (hDC)
1115    {
1116       HRGN hRgn = NtGdiCreateRectRgn( 0, 0, 0, 0 );
1117
1118       NtUserScrollDC(hDC, dx, dy, &rc, &cliprc, hrgnUpdate, rcUpdate);
1119       NtUserReleaseDC(hWnd, hDC);
1120       if (bUpdate)
1121          NtGdiCombineRgn(hrgnUpdate, hrgnUpdate, hRgn, RGN_OR);
1122       else
1123          NtUserRedrawWindow(hWnd, NULL, hRgn, RDW_INVALIDATE | RDW_ERASE);
1124       NtGdiDeleteObject(hRgn);
1125    }
1126
1127    /*
1128     * Take into account the fact that some damage may have occurred during
1129     * the scroll.
1130     */
1131
1132    hrgnTemp = NtGdiCreateRectRgn(0, 0, 0, 0);
1133    Result = NtUserGetUpdateRgn(hWnd, hrgnTemp, FALSE);
1134    if (Result != NULLREGION)
1135    {
1136       HRGN hrgnClip = NtGdiCreateRectRgnIndirect(&cliprc);
1137       NtGdiOffsetRgn(hrgnTemp, dx, dy);
1138       NtGdiCombineRgn(hrgnTemp, hrgnTemp, hrgnClip, RGN_AND);
1139       NtUserRedrawWindow(hWnd, NULL, hrgnTemp, RDW_INVALIDATE | RDW_ERASE);
1140       NtGdiDeleteObject(hrgnClip);
1141    }
1142    NtGdiDeleteObject(hrgnTemp);
1143
1144    if (flags & SW_SCROLLCHILDREN)
1145    {
1146       HWND *List = IntWinListChildren(Window);
1147       if (List)
1148       {
1149          int i;
1150          RECT r, dummy;
1151          POINT ClientOrigin;
1152
1153          for (i = 0; List[i]; i++)
1154          {
1155             NtUserGetWindowRect(List[i], &r);
1156             IntGetClientOrigin(hWnd, &ClientOrigin);
1157             r.left -= ClientOrigin.x;
1158             r.top -= ClientOrigin.y;
1159             r.right -= ClientOrigin.x;
1160             r.bottom -= ClientOrigin.y;
1161             if (!rect || NtGdiIntersectRect(&dummy, &r, &rc))
1162                WinPosSetWindowPos(List[i], 0, r.left + dx, r.top + dy, 0, 0,
1163                                   SWP_NOZORDER | SWP_NOSIZE | SWP_NOACTIVATE |
1164                                   SWP_NOREDRAW);
1165          }
1166          ExFreePool(List);
1167       }
1168    }
1169
1170    if (flags & (SW_INVALIDATE | SW_ERASE))
1171       NtUserRedrawWindow(hWnd, NULL, hrgnUpdate, RDW_INVALIDATE | RDW_ERASE |
1172                          ((flags & SW_ERASE) ? RDW_ERASENOW : 0) |
1173                          ((flags & SW_SCROLLCHILDREN) ? RDW_ALLCHILDREN : 0));
1174
1175    if (bOwnRgn && hrgnUpdate)
1176       NtGdiDeleteObject(hrgnUpdate);
1177
1178    if (hwndCaret)
1179    {
1180       IntSetCaretPos(caretrc.left + dx, caretrc.top + dy);
1181       NtUserShowCaret(hwndCaret);
1182    }
1183
1184    IntReleaseWindowObject(Window);
1185
1186    return Result;
1187 }
1188
1189 /* EOF */