d2d1: Add ID2D1GeometryGroup stub.

dlls/d2d1/d2d1_private.h

@@ -485,6 +485,12 @@ struct d2d_geometry
             ID2D1Geometry *src_geometry;
             D2D_MATRIX_3X2_F transform;
         } transformed;
+        struct
+        {
+            ID2D1Geometry **src_geometries;
+            UINT32 geometry_count;
+            D2D1_FILL_MODE fill_mode;
+        } group;
     } u;
 };
 
@@ -493,6 +499,8 @@ HRESULT d2d_rectangle_geometry_init(struct d2d_geometry *geometry,
         ID2D1Factory *factory, const D2D1_RECT_F *rect) DECLSPEC_HIDDEN;
 void d2d_transformed_geometry_init(struct d2d_geometry *geometry, ID2D1Factory *factory,
         ID2D1Geometry *src_geometry, const D2D_MATRIX_3X2_F *transform) DECLSPEC_HIDDEN;
+HRESULT d2d_geometry_group_init(struct d2d_geometry *geometry, ID2D1Factory *factory,
+        D2D1_FILL_MODE fill_mode, ID2D1Geometry **src_geometries, unsigned int geometry_count) DECLSPEC_HIDDEN;
 struct d2d_geometry *unsafe_impl_from_ID2D1Geometry(ID2D1Geometry *iface) DECLSPEC_HIDDEN;
 
 struct d2d_device

dlls/d2d1/factory.c

@@ -173,10 +173,26 @@ static HRESULT STDMETHODCALLTYPE d2d_factory_CreateEllipseGeometry(ID2D1Factory2
 static HRESULT STDMETHODCALLTYPE d2d_factory_CreateGeometryGroup(ID2D1Factory2 *iface,
         D2D1_FILL_MODE fill_mode, ID2D1Geometry **geometries, UINT32 geometry_count, ID2D1GeometryGroup **group)
 {
-    FIXME("iface %p, fill_mode %#x, geometries %p, geometry_count %u, group %p stub!\n",
+    struct d2d_geometry *object;
+    HRESULT hr;
+
+    TRACE("iface %p, fill_mode %#x, geometries %p, geometry_count %u, group %p.\n",
             iface, fill_mode, geometries, geometry_count, group);
 
-    return E_NOTIMPL;
+    if (!(object = heap_alloc_zero(sizeof(*object))))
+        return E_OUTOFMEMORY;
+
+    if (FAILED(hr = d2d_geometry_group_init(object, (ID2D1Factory *)iface, fill_mode, geometries, geometry_count)))
+    {
+        WARN("Failed to initialize geometry group, hr %#x.\n", hr);
+        heap_free(object);
+        return hr;
+    }
+
+    TRACE("Created geometry group %p.\n", object);
+    *group = (ID2D1GeometryGroup *)&object->ID2D1Geometry_iface;
+
+    return S_OK;
 }
 
 static HRESULT STDMETHODCALLTYPE d2d_factory_CreateTransformedGeometry(ID2D1Factory2 *iface,