dlls/ddraw/parent.c

   1 /*
   2  * IParent implementation
   3  *
   4  * Copyright (c) 2006 Stefan Dösinger
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  *
  20  * A universal parent interface for everything in WineD3D that doesn't have
  21  * a DDraw counterpart
  22  */
  23
  24 #include "config.h"
  25 #include "wine/port.h"
  26 #include "wine/debug.h"
  27
  28 #include <assert.h>
  29 #include <stdarg.h>
  30 #include <string.h>
  31 #include <stdlib.h>
  32
  33 #define COBJMACROS
  34
  35 #include "windef.h"
  36 #include "winbase.h"
  37 #include "winerror.h"
  38 #include "wingdi.h"
  39 #include "wine/exception.h"
  40
  41 #include "ddraw.h"
  42 #include "d3d.h"
  43
  44 #include "ddraw_private.h"
  45
  46 WINE_DEFAULT_DEBUG_CHANNEL(ddraw);
  47
  48 /*****************************************************************************
  49  * IUnknown methods
  50  *****************************************************************************/
  51
  52 /*****************************************************************************
  53  * IParent::Queryinterface
  54  *
  55  * It can't query any interfaces, and it's not used for anything. So
  56  * it just returns E_NOINTERFACE
  57  *
  58  * Params:
  59  *  riid: guid of queried interface
  60  *  obj: returns a pointer to the interface
  61  *
  62  * Return values
  63  *  This implementation always returns E_NOINTERFACE and NULL
  64  *
  65  *****************************************************************************/
  66 static HRESULT WINAPI
  67 IParentImpl_QueryInterface(IParent *iface,
  68                            REFIID riid,
  69                            void **obj)
  70 {
  71     TRACE("(%p)->(%s,%p)\n", iface, debugstr_guid(riid), obj);
  72
  73     *obj = NULL;
  74     if ( IsEqualGUID( &IID_IUnknown, riid ) ||
  75          IsEqualGUID( &IID_IParent, riid ) )
  76     {
  77         *obj = iface;
  78         IParent_AddRef(iface);
  79         return DD_OK;
  80     }
  81     return E_NOINTERFACE;
  82 }
  83
  84 /*****************************************************************************
  85  * IParent::AddRef
  86  *
  87  * Increases the refcount
  88  *
  89  * Params:
  90  *
  91  * Return values
  92  *  The new refcount
  93  *
  94  *****************************************************************************/
  95 static ULONG WINAPI
  96 IParentImpl_AddRef(IParent *iface)
  97 {
  98     IParentImpl *This = (IParentImpl *)iface;
  99     ULONG ref = InterlockedIncrement(&This->ref);
 100
 101     TRACE("(%p) : AddRef from %d\n", This, ref - 1);
 102
 103     return ref;
 104 }
 105
 106
 107 /*****************************************************************************
 108  * IParent::Release
 109  *
 110  * Releases the refcount, and destroys the object if the refcount falls to 0
 111  * Also releases the child object, if destroyed. That's almost the whole sense
 112  * of this interface.
 113  *
 114  * Params:
 115  *
 116  * Return values
 117  *  The new refcount
 118  *
 119  *****************************************************************************/
 120 static ULONG WINAPI IParentImpl_Release(IParent *iface)
 121 {
 122     IParentImpl *This = (IParentImpl *)iface;
 123     ULONG ref = InterlockedDecrement(&This->ref);
 124
 125     TRACE("(%p) : ReleaseRef to %d\n", This, ref);
 126
 127     if (ref == 0)
 128     {
 129         TRACE("(%p) Releasing child at %p\n", This, This->child);
 130         if(This->child)
 131             IUnknown_Release(This->child);
 132         HeapFree(GetProcessHeap(), 0, This);
 133         TRACE("Released\n");
 134     }
 135     return ref;
 136 }
 137
 138 /*****************************************************************************
 139  * The VTable
 140  *****************************************************************************/
 141 const IParentVtbl IParent_Vtbl =
 142 {
 143      IParentImpl_QueryInterface,
 144      IParentImpl_AddRef,
 145      IParentImpl_Release,
 146 };