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 "winnls.h"
  38 #include "winerror.h"
  39 #include "wingdi.h"
  40 #include "wine/exception.h"
  41 #include "excpt.h"
  42
  43 #include "ddraw.h"
  44 #include "d3d.h"
  45
  46 #include "ddraw_private.h"
  47
  48 WINE_DEFAULT_DEBUG_CHANNEL(ddraw);
  49
  50 const GUID IID_IParent = {0xc20e4c88, 0x74e7, 0x4940, {0xba, 0x9f, 0x2e, 0x32, 0x3f, 0x9d, 0xc9, 0x81}};
  51
  52 /*****************************************************************************
  53  * IUnknown methods
  54  *****************************************************************************/
  55
  56 /*****************************************************************************
  57  * IParent::Queryinterface
  58  *
  59  * It can't query any interfaces, and it's not used for anything. So
  60  * it just returns E_NOINTERFACE
  61  *
  62  * Params:
  63  *  riid: guid of queried interface
  64  *  obj: returns a pointer to the interface
  65  *
  66  * Return values
  67  *  This implementation always returns E_NOINTERFACE and NULL
  68  *
  69  *****************************************************************************/
  70 static HRESULT WINAPI
  71 IParentImpl_QueryInterface(IParent *iface,
  72                            REFIID riid,
  73                            void **obj)
  74 {
  75     ICOM_THIS_FROM(IParentImpl, IParent, iface);
  76     TRACE("(%p)->(%s,%p)\n", This, debugstr_guid(riid), obj);
  77
  78     *obj = NULL;
  79     if ( IsEqualGUID( &IID_IUnknown, riid ) ||
  80          IsEqualGUID( &IID_IParent, riid ) )
  81     {
  82         *obj = ICOM_INTERFACE(This, IParent);
  83         IParent_AddRef(ICOM_INTERFACE(This, IParent));
  84         return DD_OK;
  85     }
  86     return E_NOINTERFACE;
  87 }
  88
  89 /*****************************************************************************
  90  * IParent::AddRef
  91  *
  92  * Increases the refcount
  93  *
  94  * Params:
  95  *
  96  * Return values
  97  *  The new refcount
  98  *
  99  *****************************************************************************/
 100 static ULONG WINAPI
 101 IParentImpl_AddRef(IParent *iface)
 102 {
 103     ICOM_THIS_FROM(IParentImpl, IParent, iface);
 104     ULONG ref = InterlockedIncrement(&This->ref);
 105
 106     TRACE("(%p) : AddRef from %d\n", This, ref - 1);
 107
 108     return ref;
 109 }
 110
 111
 112 /*****************************************************************************
 113  * IParent::Release
 114  *
 115  * Releases the refcount, and destroys the object if the refcount falls to 0
 116  * Also releases the child object, if destroyed. That's almost the whole sense
 117  * of this interface.
 118  *
 119  * Params:
 120  *
 121  * Return values
 122  *  The new refcount
 123  *
 124  *****************************************************************************/
 125 static ULONG WINAPI
 126 IParentImpl_Release(IParent *iface)
 127 {
 128     ICOM_THIS_FROM(IParentImpl, IParent, iface);
 129     ULONG ref = InterlockedDecrement(&This->ref);
 130
 131     TRACE("(%p) : ReleaseRef to %d\n", This, ref);
 132
 133     if (ref == 0)
 134     {
 135         TRACE("(%p) Releasing child at %p\n", This, This->child);
 136         if(This->child)
 137             IUnknown_Release(This->child);
 138         HeapFree(GetProcessHeap(), 0, This);
 139         TRACE("Released\n");
 140     }
 141     return ref;
 142 }
 143
 144 /*****************************************************************************
 145  * The VTable
 146  *****************************************************************************/
 147 const IParentVtbl IParent_Vtbl =
 148 {
 149      IParentImpl_QueryInterface,
 150      IParentImpl_AddRef,
 151      IParentImpl_Release,
 152 };