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 const GUID IID_IParent = {0xc20e4c88, 0x74e7, 0x4940, {0xba, 0x9f, 0x2e, 0x32, 0x3f, 0x9d, 0xc9, 0x81}};
  49
  50 /*****************************************************************************
  51  * IUnknown methods
  52  *****************************************************************************/
  53
  54 /*****************************************************************************
  55  * IParent::Queryinterface
  56  *
  57  * It can't query any interfaces, and it's not used for anything. So
  58  * it just returns E_NOINTERFACE
  59  *
  60  * Params:
  61  *  riid: guid of queried interface
  62  *  obj: returns a pointer to the interface
  63  *
  64  * Return values
  65  *  This implementation always returns E_NOINTERFACE and NULL
  66  *
  67  *****************************************************************************/
  68 static HRESULT WINAPI
  69 IParentImpl_QueryInterface(IParent *iface,
  70                            REFIID riid,
  71                            void **obj)
  72 {
  73     ICOM_THIS_FROM(IParentImpl, IParent, iface);
  74     TRACE("(%p)->(%s,%p)\n", This, debugstr_guid(riid), obj);
  75
  76     *obj = NULL;
  77     if ( IsEqualGUID( &IID_IUnknown, riid ) ||
  78          IsEqualGUID( &IID_IParent, riid ) )
  79     {
  80         *obj = ICOM_INTERFACE(This, IParent);
  81         IParent_AddRef(ICOM_INTERFACE(This, IParent));
  82         return DD_OK;
  83     }
  84     return E_NOINTERFACE;
  85 }
  86
  87 /*****************************************************************************
  88  * IParent::AddRef
  89  *
  90  * Increases the refcount
  91  *
  92  * Params:
  93  *
  94  * Return values
  95  *  The new refcount
  96  *
  97  *****************************************************************************/
  98 static ULONG WINAPI
  99 IParentImpl_AddRef(IParent *iface)
 100 {
 101     ICOM_THIS_FROM(IParentImpl, IParent, iface);
 102     ULONG ref = InterlockedIncrement(&This->ref);
 103
 104     TRACE("(%p) : AddRef from %d\n", This, ref - 1);
 105
 106     return ref;
 107 }
 108
 109
 110 /*****************************************************************************
 111  * IParent::Release
 112  *
 113  * Releases the refcount, and destroys the object if the refcount falls to 0
 114  * Also releases the child object, if destroyed. That's almost the whole sense
 115  * of this interface.
 116  *
 117  * Params:
 118  *
 119  * Return values
 120  *  The new refcount
 121  *
 122  *****************************************************************************/
 123 static ULONG WINAPI
 124 IParentImpl_Release(IParent *iface)
 125 {
 126     ICOM_THIS_FROM(IParentImpl, IParent, iface);
 127     ULONG ref = InterlockedDecrement(&This->ref);
 128
 129     TRACE("(%p) : ReleaseRef to %d\n", This, ref);
 130
 131     if (ref == 0)
 132     {
 133         TRACE("(%p) Releasing child at %p\n", This, This->child);
 134         if(This->child)
 135             IUnknown_Release(This->child);
 136         HeapFree(GetProcessHeap(), 0, This);
 137         TRACE("Released\n");
 138     }
 139     return ref;
 140 }
 141
 142 /*****************************************************************************
 143  * The VTable
 144  *****************************************************************************/
 145 const IParentVtbl IParent_Vtbl =
 146 {
 147      IParentImpl_QueryInterface,
 148      IParentImpl_AddRef,
 149      IParentImpl_Release,
 150 };