reactos/subsystems/win32/win32k/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 ( CurrentWindow->state2 & WNDS2_INDESTROY ||
  49            CurrentWindow->state & WNDS_DESTROYED )
  50       {
  51          ERR("ATM the Current Window or Parent is dead!\n");
  52          if (VisRgn) GreDeleteObject(VisRgn);
  53          return NULL;
  54       }
  55
  56       if (!(CurrentWindow->style & WS_VISIBLE))
  57       {
  58          if (VisRgn) GreDeleteObject(VisRgn);
  59          return NULL;
  60       }
  61
  62       ClipRgn = IntSysCreateRectRgnIndirect(&CurrentWindow->rcClient);
  63       NtGdiCombineRgn(VisRgn, VisRgn, ClipRgn, RGN_AND);
  64       GreDeleteObject(ClipRgn);
  65
  66       if ((PreviousWindow->style & WS_CLIPSIBLINGS) ||
  67           (PreviousWindow == Wnd && ClipSiblings))
  68       {
  69          CurrentSibling = CurrentWindow->spwndChild;
  70          while ( CurrentSibling != NULL &&
  71                  CurrentSibling != PreviousWindow )
  72          {
  73             if ((CurrentSibling->style & WS_VISIBLE) &&
  74                 !(CurrentSibling->ExStyle & WS_EX_TRANSPARENT))
  75             {
  76                ClipRgn = IntSysCreateRectRgnIndirect(&CurrentSibling->rcWindow);
  77                /* Combine it with the window region if available */
  78                if (CurrentSibling->hrgnClip && !(CurrentSibling->style & WS_MINIMIZE))
  79                {
  80                   NtGdiOffsetRgn(ClipRgn, -CurrentSibling->rcWindow.left, -CurrentSibling->rcWindow.top);
  81                   NtGdiCombineRgn(ClipRgn, ClipRgn, CurrentSibling->hrgnClip, RGN_AND);
  82                   NtGdiOffsetRgn(ClipRgn, CurrentSibling->rcWindow.left, CurrentSibling->rcWindow.top);
  83                }
  84                NtGdiCombineRgn(VisRgn, VisRgn, ClipRgn, RGN_DIFF);
  85                GreDeleteObject(ClipRgn);
  86             }
  87             CurrentSibling = CurrentSibling->spwndNext;
  88          }
  89       }
  90
  91       PreviousWindow = CurrentWindow;
  92       CurrentWindow = CurrentWindow->spwndParent;
  93    }
  94
  95    if (ClipChildren)
  96    {
  97       CurrentWindow = Wnd->spwndChild;
  98       while (CurrentWindow)
  99       {
 100          if ((CurrentWindow->style & WS_VISIBLE) &&
 101              !(CurrentWindow->ExStyle & WS_EX_TRANSPARENT))
 102          {
 103             ClipRgn = IntSysCreateRectRgnIndirect(&CurrentWindow->rcWindow);
 104             /* Combine it with the window region if available */
 105             if (CurrentWindow->hrgnClip && !(CurrentWindow->style & WS_MINIMIZE))
 106             {
 107                NtGdiOffsetRgn(ClipRgn, -CurrentWindow->rcWindow.left, -CurrentWindow->rcWindow.top);
 108                NtGdiCombineRgn(ClipRgn, ClipRgn, CurrentWindow->hrgnClip, RGN_AND);
 109                NtGdiOffsetRgn(ClipRgn, CurrentWindow->rcWindow.left, CurrentWindow->rcWindow.top);
 110             }
 111             NtGdiCombineRgn(VisRgn, VisRgn, ClipRgn, RGN_DIFF);
 112             GreDeleteObject(ClipRgn);
 113          }
 114          CurrentWindow = CurrentWindow->spwndNext;
 115       }
 116    }
 117
 118    if (Wnd->hrgnClip && !(Wnd->style & WS_MINIMIZE))
 119    {
 120       NtGdiOffsetRgn(VisRgn, -Wnd->rcWindow.left, -Wnd->rcWindow.top);
 121       NtGdiCombineRgn(VisRgn, VisRgn, Wnd->hrgnClip, RGN_AND);
 122       NtGdiOffsetRgn(VisRgn, Wnd->rcWindow.left, Wnd->rcWindow.top);
 123    }
 124
 125    return VisRgn;
 126 }
 127
 128 VOID FASTCALL
 129 co_VIS_WindowLayoutChanged(
 130    PWND Wnd,
 131    HRGN NewlyExposed)
 132 {
 133    HRGN Temp;
 134    PWND Parent;
 135    USER_REFERENCE_ENTRY Ref;
 136
 137    ASSERT_REFS_CO(Wnd);
 138
 139    Parent = Wnd->spwndParent;
 140    if(Parent)
 141    {
 142       Temp = IntSysCreateRectRgn(0, 0, 0, 0);
 143
 144       NtGdiCombineRgn(Temp, NewlyExposed, NULL, RGN_COPY);
 145       NtGdiOffsetRgn(Temp,
 146                      Wnd->rcWindow.left - Parent->rcClient.left,
 147                      Wnd->rcWindow.top - Parent->rcClient.top);
 148
 149       UserRefObjectCo(Parent, &Ref);
 150       co_UserRedrawWindow(Parent, NULL, Temp,
 151                           RDW_FRAME | RDW_ERASE | RDW_INVALIDATE |
 152                           RDW_ALLCHILDREN);
 153       UserDerefObjectCo(Parent);
 154
 155       GreDeleteObject(Temp);
 156    }
 157 }
 158
 159 /* EOF */