[PATCH v3 0/2] MR2620: include: Add windows.ui.composition.interop.idl file.

[Mohamad Al-Jaf (＠maljaf)]

Needed for mingw Firefox build.

The WIDL error points to the wrong function, specifically the one after it.

include/windows.ui.composition.interop.idl:35:63: error: parameter 'swapchain' of function 'CreateCompositionSurfaceForHandle' cannot derive from void *

HRESULT CreateCompositionSurfaceForSwapChain([in] IUnknown *swapchain, [out, retval] ICompositionSurface **result);
                                                              ^
    make[1]: *** [Makefile:163749: include/windows.ui.composition.interop.h] Error 1

--
  v3: include: Add windows.ui.composition.interop.idl file.
      widl: Add support for WinRT HANDLE parameter type.

https://gitlab.winehq.org/wine/wine/-/merge_requests/2620

[PATCH v3 1/2] widl: Add support for WinRT HANDLE parameter type.

[Mohamad Al-Jaf]

From: Mohamad Al-Jaf

Needed by windows.ui.composition.interop.idl.
---
 tools/widl/typegen.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/widl/typegen.c b/tools/widl/typegen.c
index b3373ded11d..cf1b499aae1 100644
--- a/tools/widl/typegen.c
+++ b/tools/widl/typegen.c
@@ -342,6 +342,8 @@ enum typegen_type typegen_detect_type(const type_t *type, const attr_list_t *att
             return TGT_IFACE_POINTER;
         else if (is_aliaschain_attr(type_pointer_get_ref_type(type), ATTR_CONTEXTHANDLE))
             return TGT_CTXT_HANDLE_POINTER;
+        else if (type_get_type(type_pointer_get_ref_type(type)) == TYPE_VOID)
+            return TGT_CTXT_HANDLE;
         else
             return TGT_POINTER;
     case TYPE_STRUCT:

[PATCH v3 2/2] include: Add windows.ui.composition.interop.idl file.

[Mohamad Al-Jaf]

From: Mohamad Al-Jaf

Needed for mingw Firefox build.
---
 include/Makefile.in                        |  1 +
 include/windows.ui.composition.interop.idl | 40 ++++++++++++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 include/windows.ui.composition.interop.idl

diff --git a/include/Makefile.in b/include/Makefile.in
index f52314e745d..54d6dca234d 100644
--- a/include/Makefile.in
+++ b/include/Makefile.in
@@ -838,6 +838,7 @@ SOURCES = \
    windows.system.threading.idl \
    windows.system.userprofile.idl \
    windows.ui.composition.idl \
+	windows.ui.composition.interop.idl \
    windows.ui.core.idl \
    windows.ui.idl \
    windows.ui.viewmanagement.idl \
diff --git a/include/windows.ui.composition.interop.idl b/include/windows.ui.composition.interop.idl
new file mode 100644
index 00000000000..cde3e62f533
--- /dev/null
+++ b/include/windows.ui.composition.interop.idl
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2023 Mohamad Al-Jaf
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#ifdef __WIDL__
+#pragma winrt ns_prefix
+#endif
+
+import "windows.ui.composition.idl";
+import "sdkddkver.h";
+
+namespace Windows.UI.Composition {
+    interface ICompositorInterop;
+
+    [
+        object,
+        uuid(25297d5c-3ad4-4c9c-b5cf-e36a38512330),
+        pointer_default(unique)
+    ]
+    interface ICompositorInterop : IInspectable
+    {
+        HRESULT CreateCompositionSurfaceForHandle([in] HANDLE swapchain, [out, retval] ICompositionSurface **result);
+        HRESULT CreateCompositionSurfaceForSwapChain([in] IUnknown *swapchain, [out, retval] ICompositionSurface **result);
+        HRESULT CreateGraphicsDevice([in] IUnknown *device, [out, retval] ICompositionGraphicsDevice **result);
+    };
+}

[Mohamad Al-Jaf (＠maljaf)]

> Instead of returning `TGT_CTXT_HANDLE` when type is void, which will then make void parameters incorrectly succeed some checks, I'd suggest adding some logic in the `TYPE_POINTER` case, checking whether the type is an alias to `void*` which name is `HANDLE`.

Checking the name leads to a segmentation fault in dlls/actxprxy. Is the current way fine?
> Probably the simplest thing to do, is to add it to the `TYPE_POINTER` case in check_field_common, to avoid overloading the `TGT_CTXT_HANDLE` meaning, or having to add a specific `TGT_HANDLE` value.

I couldn't find `TYPE_POINTER` case in check_field_common, unless you meant `TGT_POINTER`. Regardless, it doesn't seem like it would work because `typegen_detect_type` returns `TGT_INVALID` for TYPE_VOID.
> Note that this is a problem only because we're trying to use an IDL here. As far as I can see, the SDK doesn't have one and uses a .h directly instead (though it's probably fine and cleaner to use an IDL).

Yeah, I thought it was preferred to add an IDL if possible. I don't mind doing it either way though.