winaccessibility: replace CoCreateInstance with direct instantiation

This is an alternative (to 732ec36e)
solution to the "CoCreateInstance does not work" problem:
replace all CoCreateInstance calls with equivalent calls to create
the components directly.

Since the only reason why this COM stuff needs to be registered
at all is that AccObject uses CoCreateInstance() to create its
COM objects, another possible solution appears to be to simply link
the libraries and instantiate the COM objects directly, without COM.

The only difference appears to be that CoCreateInstance would
automatically add proxy objects in case the COM objects reside in a
single-threaded appartment; not sure if that is relevant here.

Change-Id: I8ffb8af501f6084f3145fa4d4f53366a070e1691
Reviewed-on: https://gerrit.libreoffice.org/6792Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>

winaccessibility/Library_uacccom.mk

@@ -20,6 +20,7 @@ $(eval $(call gb_Library_set_include,UAccCOM,\
 ))
 
 $(eval $(call gb_Library_add_defs,UAccCOM,\
+	-DUACCCOM_DLLIMPLEMENTATION \
 	-D_UNICODE=1 \
 ))
 

winaccessibility/Library_winaccessibility.mk

@@ -53,6 +53,7 @@ $(eval $(call gb_Library_use_externals,winaccessibility,\
 ))
 
 $(eval $(call gb_Library_use_libraries,winaccessibility,\
+	UAccCOM \
 	cppu \
 	cppuhelper \
 	vcl \

winaccessibility/inc/UAccCOMdllapi.h

+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_UACCCOM_UACCCOMDLLAPI_H
+#define INCLUDED_UACCCOM_UACCCOMDLLAPI_H
+
+#include <sal/types.h>
+
+#if defined(UACCCOM_DLLIMPLEMENTATION)
+#define UACCCOM_DLLPUBLIC SAL_DLLPUBLIC_EXPORT
+#else
+#define UACCCOM_DLLPUBLIC SAL_DLLPUBLIC_IMPORT
+#endif
+#define UACCCOM_DLLPRIVATE SAL_DLLPRIVATE
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

winaccessibility/inc/accHelper.hxx

@@ -20,6 +20,8 @@
 #ifndef __ACCHELPER_HXX
 #define __ACCHELPER_HXX
 
+#include <UAccCOMdllapi.h>
+
 enum DIRECTION
 {
     FIRST_CHILD=0,
@@ -30,6 +32,8 @@ enum DIRECTION
 
 #define UNO_MSAA_UNMAPPING       0x00000000
 
+struct IMAccessible;
+UACCCOM_DLLPUBLIC IMAccessible * UAccCOMCreateInstance();
 
 #endif
 

winaccessibility/source/UAccCOM/AccHypertext.cxx

@@ -20,6 +20,8 @@
 #include "stdafx.h"
 #include "UAccCOM.h"
 #include "AccHypertext.h"
+#include "AccHyperLink.h"
+#include "acccommon.h"
 
 #include "act.hxx"
 
@@ -325,11 +327,7 @@ STDMETHODIMP CAccHypertext::get_hyperlink(long index,IAccessibleHyperlink **hype
     }
 
     IAccessibleHyperlink* plink = NULL;
-    ActivateActContext();
-    HRESULT hr = CoCreateInstance( CLSID_AccHyperLink, NULL, CLSCTX_SERVER ,
-                                   IID_IAccessibleHyperlink,
-                                   (void **)&plink);
-    DeactivateActContext();
+    HRESULT hr = createInstance<CAccHyperLink>(IID_IAccessibleHyperlink, &plink);
     if( SUCCEEDED(hr) )
     {
         IUNOXWrapper* wrapper = NULL;

winaccessibility/source/UAccCOM/AccTable.cxx

@@ -214,13 +214,7 @@ STDMETHODIMP CAccTable::get_columnHeader(IAccessibleTable __RPC_FAR *__RPC_FAR *
     *startingRowIndex = 0 ;
 
     IMAccessible* pIMacc = NULL;
-    ActivateActContext();
-    HRESULT hr = CoCreateInstance( CLSID_MAccessible, NULL, CLSCTX_ALL ,
-                                    IID_IMAccessible,
-                                    (void **)&pIMacc
-                                  );
-    DeactivateActContext();
-
+    HRESULT hr = createInstance<CMAccessible>(IID_IMAccessible, &pIMacc);
     if (!SUCCEEDED(hr))
     {
         return E_FAIL;
@@ -448,13 +442,7 @@ STDMETHODIMP CAccTable::get_rowHeader(IAccessibleTable __RPC_FAR *__RPC_FAR *acc
     *startingColumnIndex = 0 ;
 
     IMAccessible* pIMacc = NULL;
-    ActivateActContext();
-    HRESULT hr = CoCreateInstance( CLSID_MAccessible, NULL, CLSCTX_ALL ,
-                                    IID_IMAccessible,
-                                    (void **)&pIMacc
-                                  );
-    DeactivateActContext();
-
+    HRESULT hr = createInstance<CMAccessible>(IID_IMAccessible, &pIMacc);
     if (!SUCCEEDED(hr))
     {
         return E_FAIL;

winaccessibility/source/UAccCOM/EnumVariant.cxx

@@ -155,10 +155,7 @@ HRESULT STDMETHODCALLTYPE CEnumVariant::Clone(IEnumVARIANT __RPC_FAR *__RPC_FAR
    */
 HRESULT STDMETHODCALLTYPE CEnumVariant::Create(CEnumVariant __RPC_FAR *__RPC_FAR *ppenum)
 {
-    ActivateActContext();
-    HRESULT hr = CoCreateInstance(CLSID_EnumVariant,NULL,
-                                 CLSCTX_SERVER,IID_IEnumVariant,(void **)ppenum);
-    DeactivateActContext();
+    HRESULT hr = createInstance<CEnumVariant>(IID_IEnumVariant, ppenum);
     if (S_OK != hr)
     {
         return E_FAIL;

winaccessibility/source/UAccCOM/MAccessible.cxx

@@ -23,6 +23,15 @@
 
 #include <algorithm>
 #include "AccAction.h"
+#include "AccRelation.h"
+#include "AccComponent.h"
+#include "AccText.h"
+#include "AccEditableText.h"
+#include "AccImage.h"
+#include "AccTable.h"
+#include "AccValue.h"
+#include "AccHypertext.h"
+#include "AccHyperLink.h"
 
 #include <com/sun/star/accessibility/XAccessibleText.hpp>
 #include <com/sun/star/accessibility/XAccessibleEditableText.hpp>
@@ -1720,11 +1729,8 @@ STDMETHODIMP CMAccessible::get_relation( long relationIndex, IAccessibleRelation
             }
 
             IAccessibleRelation* pRelation = NULL;
-            ActivateActContext();
-            HRESULT hr = CoCreateInstance( CLSID_AccRelation, NULL, CLSCTX_SERVER ,
-                IID_IAccessibleRelation,
-                (void **)&pRelation);
-            DeactivateActContext();
+            HRESULT hr = createInstance<CAccRelation>(IID_IAccessibleRelation,
+                            &pRelation);
             if(SUCCEEDED(hr))
             {
                 IUNOXWrapper* wrapper = NULL;
@@ -1784,11 +1790,8 @@ STDMETHODIMP CMAccessible::get_relations( long, IAccessibleRelation __RPC_FAR *_
         for(int i=0; i<nCount ; i++)
         {
             IAccessibleRelation* pRelation = NULL;
-            ActivateActContext();
-            HRESULT hr = CoCreateInstance( CLSID_AccRelation, NULL, CLSCTX_SERVER ,
-                IID_IAccessibleRelation,
-                (void **)&pRelation);
-            DeactivateActContext();
+            HRESULT hr = createInstance<CAccRelation>(IID_IAccessibleRelation,
+                            &pRelation);
             if(SUCCEEDED(hr))
             {
                 IUNOXWrapper* wrapper = NULL;
@@ -2557,7 +2560,18 @@ BOOL CMAccessible::GetXInterfaceFromXAccessible(XAccessible* pXAcc, XInterface**
     return FALSE;
 }
 
-HRESULT WINAPI CMAccessible::SmartQI(void* pv, REFIID iid, void** ppvObject)
+template<typename T> HRESULT
+createAggInstance(CMAccessible &rOuter, REFIID iid, void ** ppvObject)
+{
+//    return CComCreator< CComAggObject<T> >::CreateInstance(
+//    XXX: do not use CComAggObject - the aggregation is hand-crafted!
+//         the SmartQI method must not call itself recursively -
+//         which it will do if CComAggObject redirects QueryInterface.
+    return CComCreator< CComObject<T> >::CreateInstance(
+            rOuter.GetControllingUnknown(), iid, ppvObject);
+}
+
+HRESULT WINAPI CMAccessible::SmartQI(void* /*pv*/, REFIID iid, void** ppvObject)
 {
     ENTER_PROTECTED_BLOCK
         ISDESTROY()
@@ -2589,9 +2603,40 @@ HRESULT WINAPI CMAccessible::SmartQI(void* pv, REFIID iid, void** ppvObject)
             }
             else
             {
-                ActivateActContext();
-                HRESULT hr = pMap->pfnCreateInstance(pv, iid, ppvObject);
-                DeactivateActContext();
+                HRESULT hr(REGDB_E_CLASSNOTREG);
+                switch (pMap->XIFIndex)
+                {
+                    case XI_COMPONENT:
+                        hr = createAggInstance<CAccComponent>(*this, iid, ppvObject);
+                        break;
+                    case XI_TEXT:
+                        hr = createAggInstance<CAccText>(*this, iid, ppvObject);
+                        break;
+                    case XI_EDITABLETEXT:
+                        hr = createAggInstance<CAccEditableText>(*this, iid, ppvObject);
+                        break;
+                    case XI_IMAGE:
+                        hr = createAggInstance<CAccImage>(*this, iid, ppvObject);
+                        break;
+                    case XI_TABLE:
+                        hr = createAggInstance<CAccTable>(*this, iid, ppvObject);
+                        break;
+                    case XI_ACTION:
+                        hr = createAggInstance<CAccAction>(*this, iid, ppvObject);
+                        break;
+                    case XI_VALUE:
+                        hr = createAggInstance<CAccValue>(*this, iid, ppvObject);
+                        break;
+                    case XI_HYPERTEXT:
+                        hr = createAggInstance<CAccHypertext>(*this, iid, ppvObject);
+                        break;
+                    case XI_HYPERLINK:
+                        hr = createAggInstance<CAccHyperLink>(*this, iid, ppvObject);
+                        break;
+                    default:
+                        assert(false);
+                }
+                assert(hr == S_OK);
                 if(hr == S_OK)
                 {
                     m_containedObjects.insert(XGUIDToComObjHash::value_type(*pMap->piid,(IUnknown*)*ppvObject));

winaccessibility/source/UAccCOM/UAccCOM.cxx

@@ -21,6 +21,7 @@
 #include "resource.h"
 #include <initguid.h>
 #include "UAccCOM.h"
+#include <accHelper.hxx>
 
 #include "UAccCOM_i.c"
 #include "ia2_api_all_i.c"
@@ -110,4 +111,12 @@ STDAPI DllUnregisterServer(void)
     return _Module.UnregisterServer(TRUE);
 }
 
+
+IMAccessible * UAccCOMCreateInstance()
+{
+    IMAccessible * pIMA = 0;
+    HRESULT hr = createInstance<CMAccessible>(IID_IMAccessible, &pIMA);
+    return (S_OK == hr) ? pIMA : 0;
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

winaccessibility/source/UAccCOM/acccommon.h

@@ -85,6 +85,12 @@ inline BOOL ImplIsEqualGUID(REFGUID rguid1, REFGUID rguid2)
 
 static DWORD GetMSAAStateFromUNO(short xState);
 
+template<typename T, typename Ifc> HRESULT
+createInstance(REFIID iid, Ifc ** ppIfc)
+{
+    return CComCreator< CComObject<T> >::CreateInstance(0, iid, (void**)ppIfc);
+}
+
 #endif
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

winaccessibility/source/service/AccObject.cxx

@@ -244,21 +244,11 @@ void AccObject::UpdateValidWindow()
    */
 sal_Bool AccObject::ImplInitializeCreateObj()
 {
-    ActivateActContext();
-    HRESULT hr = CoCreateInstance( CLSID_MAccessible, NULL, CLSCTX_ALL,
-                                   IID_IMAccessible,
-                                   (void **)&m_pIMAcc);
-    SAL_WARN_IF(
-        m_pIMAcc == 0, "iacc2",
-        "Failed to create IAccessible2 instance: 0x" << std::hex << hr);
-    DeactivateActContext();
-
-    if ( S_OK != hr )
-    {
-        return sal_False;
-    }
+    m_pIMAcc = UAccCOMCreateInstance();
 
-    return sal_True;
+    assert(m_pIMAcc);
+
+    return m_pIMAcc != 0;
 }
 
 /**