reactos/win32ss/user/ntuser/vis.c

   1 /*
   2  * COPYRIGHT:        See COPYING in the top level directory
   3  * PROJECT:          ReactOS kernel
   4  * PURPOSE:          Visibility computations
   5  * FILE:             subsys/win32k/ntuser/vis.c
   6  * PROGRAMMER:       Ge van Geldorp (ge@gse.nl)
   7  */
   8
   9 #include <win32k.h>
  10 DBG_DEFAULT_CHANNEL(UserWinpos);
  11
  12 PREGION FASTCALL
  13 VIS_ComputeVisibleRegion(
  14    PWND Wnd,
  15    BOOLEAN ClientArea,
  16    BOOLEAN ClipChildren,
  17    BOOLEAN ClipSiblings)
  18 {
  19    PREGION VisRgn, ClipRgn;
  20    PWND PreviousWindow, CurrentWindow, CurrentSibling;
  21
  22    if (!Wnd || !(Wnd->style & WS_VISIBLE))
  23    {
  24       return NULL;
  25    }
  26
  27    VisRgn = NULL;
  28
  29    if (ClientArea)
  30    {
  31       VisRgn = IntSysCreateRectpRgnIndirect(&Wnd->rcClient);
  32    }
  33    else
  34    {
  35       VisRgn = IntSysCreateRectpRgnIndirect(&Wnd->rcWindow);
  36    }
  37
  38    /*
  39     * Walk through all parent windows and for each clip the visble region
  40     * to the parent's client area and exclude all siblings that are over
  41     * our window.
  42     */
  43
  44    PreviousWindow = Wnd;
  45    CurrentWindow = Wnd->spwndParent;
  46    while (CurrentWindow)
  47    {
  48       if (!VerifyWnd(CurrentWindow))
  49       {
  50          ERR("ATM the Current Window or Parent is dead! %p\n",CurrentWindow);
  51          if (VisRgn)
  52              REGION_Delete(VisRgn);
  53          return NULL;
  54       }
  55
  56       if (!(CurrentWindow->style & WS_VISIBLE))
  57       {
  58          if (VisRgn)
  59              REGION_Delete(VisRgn);
  60          return NULL;
  61       }
  62
  63       ClipRgn = IntSysCreateRectpRgnIndirect(&CurrentWindow->rcClient);
  64       IntGdiCombineRgn(VisRgn, VisRgn, ClipRgn, RGN_AND);
  65       REGION_Delete(ClipRgn);
  66
  67       if ((PreviousWindow->style & WS_CLIPSIBLINGS) ||
  68           (PreviousWindow == Wnd && ClipSiblings))
  69       {
  70          CurrentSibling = CurrentWindow->spwndChild;
  71          while ( CurrentSibling != NULL &&
  72                  CurrentSibling != PreviousWindow )
  73          {
  74             if ((CurrentSibling->style & WS_VISIBLE) &&
  75                 !(CurrentSibling->ExStyle & WS_EX_TRANSPARENT))
  76             {
  77                ClipRgn = IntSysCreateRectpRgnIndirect(&CurrentSibling->rcWindow);
  78                /* Combine it with the window region if available */
  79                if (CurrentSibling->hrgnClip && !(CurrentSibling->style & WS_MINIMIZE))
  80                {
  81                   PREGION SiblingClipRgn = REGION_LockRgn(CurrentSibling->hrgnClip);
  82                   if (SiblingClipRgn)
  83                   {
  84                       REGION_bOffsetRgn(ClipRgn, -CurrentSibling->rcWindow.left, -CurrentSibling->rcWindow.top);
  85                       IntGdiCombineRgn(ClipRgn, ClipRgn, SiblingClipRgn, RGN_AND);
  86                       REGION_bOffsetRgn(ClipRgn, CurrentSibling->rcWindow.left, CurrentSibling->rcWindow.top);
  87                       REGION_UnlockRgn(SiblingClipRgn);
  88                   }
  89                }
  90                IntGdiCombineRgn(VisRgn, VisRgn, ClipRgn, RGN_DIFF);
  91                REGION_Delete(ClipRgn);
  92             }
  93             CurrentSibling = CurrentSibling->spwndNext;
  94          }
  95       }
  96
  97       PreviousWindow = CurrentWindow;
  98       CurrentWindow = CurrentWindow->spwndParent;
  99    }
 100
 101    if (ClipChildren)
 102    {
 103       CurrentWindow = Wnd->spwndChild;
 104       while (CurrentWindow)
 105       {
 106          if ((CurrentWindow->style & WS_VISIBLE) &&
 107              !(CurrentWindow->ExStyle & WS_EX_TRANSPARENT))
 108          {
 109             ClipRgn = IntSysCreateRectpRgnIndirect(&CurrentWindow->rcWindow);
 110             /* Combine it with the window region if available */
 111             if (CurrentWindow->hrgnClip && !(CurrentWindow->style & WS_MINIMIZE))
 112             {
 113                PREGION CurrentRgnClip = REGION_LockRgn(CurrentWindow->hrgnClip);
 114                if (CurrentRgnClip)
 115                {
 116                    REGION_bOffsetRgn(ClipRgn, -CurrentWindow->rcWindow.left, -CurrentWindow->rcWindow.top);
 117                    IntGdiCombineRgn(ClipRgn, ClipRgn, CurrentRgnClip, RGN_AND);
 118                    REGION_bOffsetRgn(ClipRgn, CurrentWindow->rcWindow.left, CurrentWindow->rcWindow.top);
 119                    REGION_UnlockRgn(CurrentRgnClip);
 120                }
 121             }
 122             IntGdiCombineRgn(VisRgn, VisRgn, ClipRgn, RGN_DIFF);
 123             REGION_Delete(ClipRgn);
 124          }
 125          CurrentWindow = CurrentWindow->spwndNext;
 126       }
 127    }
 128
 129    if (Wnd->hrgnClip && !(Wnd->style & WS_MINIMIZE))
 130    {
 131       PREGION WndRgnClip = REGION_LockRgn(Wnd->hrgnClip);
 132       if (WndRgnClip)
 133       {
 134           REGION_bOffsetRgn(VisRgn, -Wnd->rcWindow.left, -Wnd->rcWindow.top);
 135           IntGdiCombineRgn(VisRgn, VisRgn, WndRgnClip, RGN_AND);
 136           REGION_bOffsetRgn(VisRgn, Wnd->rcWindow.left, Wnd->rcWindow.top);
 137           REGION_UnlockRgn(WndRgnClip);
 138       }
 139    }
 140
 141    return VisRgn;
 142 }
 143
 144 VOID FASTCALL
 145 co_VIS_WindowLayoutChanged(
 146    PWND Wnd,
 147    PREGION NewlyExposed)
 148 {
 149    PWND Parent;
 150    USER_REFERENCE_ENTRY Ref;
 151
 152    ASSERT_REFS_CO(Wnd);
 153
 154    Parent = Wnd->spwndParent;
 155    if(Parent)
 156    {
 157        PREGION TempRgn = IntSysCreateRectpRgn(0, 0, 0, 0);
 158
 159        if (!TempRgn)
 160            return;
 161
 162        IntGdiCombineRgn(TempRgn, NewlyExposed, NULL, RGN_COPY);
 163        REGION_bOffsetRgn(TempRgn,
 164                          Wnd->rcWindow.left - Parent->rcClient.left,
 165                          Wnd->rcWindow.top - Parent->rcClient.top);
 166
 167        UserRefObjectCo(Parent, &Ref);
 168        co_UserRedrawWindow(Parent, NULL, TempRgn,
 169                            RDW_FRAME | RDW_ERASE | RDW_INVALIDATE |
 170                            RDW_ALLCHILDREN);
 171        UserDerefObjectCo(Parent);
 172
 173        REGION_Delete(TempRgn);
 174    }
 175 }
 176
 177 /* EOF */