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 HRGN FASTCALL
  13 VIS_ComputeVisibleRegion(
  14    PWND Wnd,
  15    BOOLEAN ClientArea,
  16    BOOLEAN ClipChildren,
  17    BOOLEAN ClipSiblings)
  18 {
  19    HRGN 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 = IntSysCreateRectRgnIndirect(&Wnd->rcClient);
  32    }
  33    else
  34    {
  35       VisRgn = IntSysCreateRectRgnIndirect(&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) GreDeleteObject(VisRgn);
  52          return NULL;
  53       }
  54
  55       if (!(CurrentWindow->style & WS_VISIBLE))
  56       {
  57          if (VisRgn) GreDeleteObject(VisRgn);
  58          return NULL;
  59       }
  60
  61       ClipRgn = IntSysCreateRectRgnIndirect(&CurrentWindow->rcClient);
  62       NtGdiCombineRgn(VisRgn, VisRgn, ClipRgn, RGN_AND);
  63       GreDeleteObject(ClipRgn);
  64
  65       if ((PreviousWindow->style & WS_CLIPSIBLINGS) ||
  66           (PreviousWindow == Wnd && ClipSiblings))
  67       {
  68          CurrentSibling = CurrentWindow->spwndChild;
  69          while ( CurrentSibling != NULL &&
  70                  CurrentSibling != PreviousWindow )
  71          {
  72             if ((CurrentSibling->style & WS_VISIBLE) &&
  73                 !(CurrentSibling->ExStyle & WS_EX_TRANSPARENT))
  74             {
  75                ClipRgn = IntSysCreateRectRgnIndirect(&CurrentSibling->rcWindow);
  76                /* Combine it with the window region if available */
  77                if (CurrentSibling->hrgnClip && !(CurrentSibling->style & WS_MINIMIZE))
  78                {
  79                   NtGdiOffsetRgn(ClipRgn, -CurrentSibling->rcWindow.left, -CurrentSibling->rcWindow.top);
  80                   NtGdiCombineRgn(ClipRgn, ClipRgn, CurrentSibling->hrgnClip, RGN_AND);
  81                   NtGdiOffsetRgn(ClipRgn, CurrentSibling->rcWindow.left, CurrentSibling->rcWindow.top);
  82                }
  83                NtGdiCombineRgn(VisRgn, VisRgn, ClipRgn, RGN_DIFF);
  84                GreDeleteObject(ClipRgn);
  85             }
  86             CurrentSibling = CurrentSibling->spwndNext;
  87          }
  88       }
  89
  90       PreviousWindow = CurrentWindow;
  91       CurrentWindow = CurrentWindow->spwndParent;
  92    }
  93
  94    if (ClipChildren)
  95    {
  96       CurrentWindow = Wnd->spwndChild;
  97       while (CurrentWindow)
  98       {
  99          if ((CurrentWindow->style & WS_VISIBLE) &&
 100              !(CurrentWindow->ExStyle & WS_EX_TRANSPARENT))
 101          {
 102             ClipRgn = IntSysCreateRectRgnIndirect(&CurrentWindow->rcWindow);
 103             /* Combine it with the window region if available */
 104             if (CurrentWindow->hrgnClip && !(CurrentWindow->style & WS_MINIMIZE))
 105             {
 106                NtGdiOffsetRgn(ClipRgn, -CurrentWindow->rcWindow.left, -CurrentWindow->rcWindow.top);
 107                NtGdiCombineRgn(ClipRgn, ClipRgn, CurrentWindow->hrgnClip, RGN_AND);
 108                NtGdiOffsetRgn(ClipRgn, CurrentWindow->rcWindow.left, CurrentWindow->rcWindow.top);
 109             }
 110             NtGdiCombineRgn(VisRgn, VisRgn, ClipRgn, RGN_DIFF);
 111             GreDeleteObject(ClipRgn);
 112          }
 113          CurrentWindow = CurrentWindow->spwndNext;
 114       }
 115    }
 116
 117    if (Wnd->hrgnClip && !(Wnd->style & WS_MINIMIZE))
 118    {
 119       NtGdiOffsetRgn(VisRgn, -Wnd->rcWindow.left, -Wnd->rcWindow.top);
 120       NtGdiCombineRgn(VisRgn, VisRgn, Wnd->hrgnClip, RGN_AND);
 121       NtGdiOffsetRgn(VisRgn, Wnd->rcWindow.left, Wnd->rcWindow.top);
 122    }
 123
 124    return VisRgn;
 125 }
 126
 127 VOID FASTCALL
 128 co_VIS_WindowLayoutChanged(
 129    PWND Wnd,
 130    HRGN NewlyExposed)
 131 {
 132    HRGN Temp;
 133    PWND Parent;
 134    USER_REFERENCE_ENTRY Ref;
 135
 136    ASSERT_REFS_CO(Wnd);
 137
 138    Parent = Wnd->spwndParent;
 139    if(Parent)
 140    {
 141       Temp = IntSysCreateRectRgn(0, 0, 0, 0);
 142
 143       NtGdiCombineRgn(Temp, NewlyExposed, NULL, RGN_COPY);
 144       NtGdiOffsetRgn(Temp,
 145                      Wnd->rcWindow.left - Parent->rcClient.left,
 146                      Wnd->rcWindow.top - Parent->rcClient.top);
 147
 148       UserRefObjectCo(Parent, &Ref);
 149       co_UserRedrawWindow(Parent, NULL, Temp,
 150                           RDW_FRAME | RDW_ERASE | RDW_INVALIDATE |
 151                           RDW_ALLCHILDREN);
 152       UserDerefObjectCo(Parent);
 153
 154       GreDeleteObject(Temp);
 155    }
 156 }
 157
 158 /* EOF */