windows/dce.c

   1 /*
   2  * USER DCE functions
   3  *
   4  * Copyright 1993 Alexandre Julliard
   5  */
   6
   7 static char Copyright[] = "Copyright  Alexandre Julliard, 1993";
   8
   9 #include "dce.h"
  10 #include "class.h"
  11 #include "win.h"
  12 #include "gdi.h"
  13 #include "user.h"
  14
  15
  16 #define NB_DCE    5  /* Number of DCEs created at startup */
  17
  18 extern Display * display;
  19
  20 static HANDLE firstDCE = 0;
  21 static HDC defaultDCstate = 0;
  22
  23
  24 /***********************************************************************
  25  *           DCE_AllocDCE
  26  *
  27  * Allocate a new DCE.
  28  */
  29 HANDLE DCE_AllocDCE( DCE_TYPE type )
  30 {
  31     DCE * dce;
  32     HANDLE handle = USER_HEAP_ALLOC( GMEM_MOVEABLE, sizeof(DCE) );
  33     if (!handle) return 0;
  34     dce = (DCE *) USER_HEAP_ADDR( handle );
  35     if (!(dce->hdc = CreateDC( "DISPLAY", NULL, NULL, NULL )))
  36     {
  37         USER_HEAP_FREE( handle );
  38         return 0;
  39     }
  40     dce->hwndCurrent = 0;
  41     dce->type  = type;
  42     dce->inUse = (type != DCE_CACHE_DC);
  43     dce->xOrigin = 0;
  44     dce->yOrigin = 0;
  45     dce->hNext = firstDCE;
  46     firstDCE = handle;
  47     return handle;
  48 }
  49
  50
  51 /***********************************************************************
  52  *           DCE_FreeDCE
  53  */
  54 void DCE_FreeDCE( HANDLE hdce )
  55 {
  56     DCE * dce;
  57     HANDLE *handle = &firstDCE;
  58
  59     if (!(dce = (DCE *) USER_HEAP_ADDR( hdce ))) return;
  60     while (*handle && (*handle != hdce))
  61     {
  62         DCE * prev = (DCE *) USER_HEAP_ADDR( *handle );
  63         handle = &prev->hNext;
  64     }
  65     if (*handle == hdce) *handle = dce->hNext;
  66     DeleteDC( dce->hdc );
  67     USER_HEAP_FREE( hdce );
  68 }
  69
  70
  71 /***********************************************************************
  72  *           DCE_Init
  73  */
  74 void DCE_Init()
  75 {
  76     int i;
  77     HANDLE handle;
  78     DCE * dce;
  79
  80     for (i = 0; i < NB_DCE; i++)
  81     {
  82         if (!(handle = DCE_AllocDCE( DCE_CACHE_DC ))) return;
  83         dce = (DCE *) USER_HEAP_ADDR( handle );
  84         if (!defaultDCstate) defaultDCstate = GetDCState( dce->hdc );
  85     }
  86 }
  87
  88
  89 /***********************************************************************
  90  *           GetDCEx    (USER.359)
  91  */
  92 /* Unimplemented flags: DCX_CLIPSIBLINGS, DCX_LOCKWINDOWUPDATE, DCX_PARENTCLIP
  93  */
  94 HDC GetDCEx( HWND hwnd, HRGN hrgnClip, DWORD flags )
  95 {
  96     HANDLE hdce;
  97     HDC hdc = 0;
  98     DCE * dce;
  99     DC * dc;
 100     WND * wndPtr;
 101
 102     if (hwnd)
 103     {
 104         if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
 105     }
 106     else wndPtr = NULL;
 107
 108     if (flags & DCX_USESTYLE)
 109     {
 110         /* Not sure if this is the real meaning of the DCX_USESTYLE flag... */
 111         flags &= ~(DCX_CACHE | DCX_CLIPCHILDREN | DCX_CLIPSIBLINGS);
 112         if (wndPtr)
 113         {
 114             if (!(wndPtr->flags & (WIN_CLASS_DC | WIN_OWN_DC)))
 115                 flags |= DCX_CACHE;
 116             if (wndPtr->dwStyle & WS_CLIPCHILDREN) flags |= DCX_CLIPCHILDREN;
 117             if (wndPtr->dwStyle & WS_CLIPSIBLINGS) flags |= DCX_CLIPSIBLINGS;
 118         }
 119         else flags |= DCX_CACHE;
 120     }
 121
 122     if (flags & DCX_CACHE)
 123     {
 124         for (hdce = firstDCE; (hdce); hdce = dce->hNext)
 125         {
 126             if (!(dce = (DCE *) USER_HEAP_ADDR( hdce ))) return 0;
 127             if ((dce->type == DCE_CACHE_DC) && (!dce->inUse)) break;
 128         }
 129     }
 130     else hdce = wndPtr->hdce;
 131
 132     if (!hdce) return 0;
 133     dce = (DCE *) USER_HEAP_ADDR( hdce );
 134     dce->hwndCurrent = hwnd;
 135     dce->inUse       = TRUE;
 136     hdc = dce->hdc;
 137
 138       /* Initialize DC */
 139
 140     if (!(dc = (DC *) GDI_GetObjPtr( hdc, DC_MAGIC ))) return 0;
 141
 142     if (wndPtr)
 143     {
 144         dc->u.x.drawable = wndPtr->window;
 145         if (flags & DCX_WINDOW)
 146         {
 147             dc->w.DCOrgX  = 0;
 148             dc->w.DCOrgY  = 0;
 149             dc->w.DCSizeX = wndPtr->rectWindow.right - wndPtr->rectWindow.left;
 150             dc->w.DCSizeY = wndPtr->rectWindow.bottom - wndPtr->rectWindow.top;
 151         }
 152         else
 153         {
 154             dc->w.DCOrgX  = wndPtr->rectClient.left - wndPtr->rectWindow.left;
 155             dc->w.DCOrgY  = wndPtr->rectClient.top - wndPtr->rectWindow.top;
 156             dc->w.DCSizeX = wndPtr->rectClient.right - wndPtr->rectClient.left;
 157             dc->w.DCSizeY = wndPtr->rectClient.bottom - wndPtr->rectClient.top;
 158             IntersectVisRect( hdc, 0, 0, dc->w.DCSizeX, dc->w.DCSizeY );
 159         }
 160     }
 161     else dc->u.x.drawable = DefaultRootWindow( display );
 162
 163     if (flags & DCX_CLIPCHILDREN)
 164         XSetSubwindowMode( display, dc->u.x.gc, ClipByChildren );
 165     else XSetSubwindowMode( display, dc->u.x.gc, IncludeInferiors);
 166
 167     if ((flags & DCX_INTERSECTRGN) || (flags & DCX_EXCLUDERGN))
 168     {
 169         HRGN hrgn = CreateRectRgn( 0, 0, 0, 0 );
 170         if (hrgn)
 171         {
 172             if (CombineRgn( hrgn, InquireVisRgn(hdc), hrgnClip,
 173                             (flags & DCX_INTERSECTRGN) ? RGN_AND : RGN_DIFF ))
 174                 SelectVisRgn( hdc, hrgn );
 175             DeleteObject( hrgn );
 176         }
 177     }
 178
 179 #ifdef DEBUG_DC
 180     printf( "GetDCEx(%d,%d,0x%x): returning %d\n", hwnd, hrgnClip, flags, hdc);
 181 #endif
 182     return hdc;
 183 }
 184
 185
 186 /***********************************************************************
 187  *           GetDC    (USER.66)
 188  */
 189 HDC GetDC( HWND hwnd )
 190 {
 191     return GetDCEx( hwnd, 0, DCX_USESTYLE );
 192 }
 193
 194
 195 /***********************************************************************
 196  *           GetWindowDC    (USER.67)
 197  */
 198 HDC GetWindowDC( HWND hwnd )
 199 {
 200     int flags = DCX_CACHE | DCX_WINDOW;
 201     if (hwnd)
 202     {
 203         WND * wndPtr;
 204         if (!(wndPtr = WIN_FindWndPtr( hwnd ))) return 0;
 205         if (wndPtr->dwStyle & WS_CLIPCHILDREN) flags |= DCX_CLIPCHILDREN;
 206         if (wndPtr->dwStyle & WS_CLIPSIBLINGS) flags |= DCX_CLIPSIBLINGS;
 207     }
 208     return GetDCEx( hwnd, 0, flags );
 209 }
 210
 211
 212 /***********************************************************************
 213  *           ReleaseDC    (USER.68)
 214  */
 215 int ReleaseDC( HWND hwnd, HDC hdc )
 216 {
 217     HANDLE hdce;
 218     DCE * dce = NULL;
 219
 220 #ifdef DEBUG_DC
 221     printf( "ReleaseDC: %d %d\n", hwnd, hdc );
 222 #endif
 223
 224     for (hdce = firstDCE; (hdce); hdce = dce->hNext)
 225     {
 226         if (!(dce = (DCE *) USER_HEAP_ADDR( hdce ))) return 0;
 227         if (dce->inUse && (dce->hdc == hdc)) break;
 228     }
 229     if (!hdce) return 0;
 230
 231     if (dce->type == DCE_CACHE_DC)
 232     {
 233         SetDCState( dce->hdc, defaultDCstate );
 234         dce->inUse = FALSE;
 235     }
 236     return 1;
 237 }