[PATCH 4/5] d2d1: Introduce unsafe_impl_from_ID2D1Effect().

[Ziqing Hui]

Signed-off-by: Ziqing Hui <zhui at codeweavers.com>
---
 dlls/d2d1/d2d1_private.h | 1 +
 dlls/d2d1/effect.c       | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/dlls/d2d1/d2d1_private.h b/dlls/d2d1/d2d1_private.h
index aa8e8569455..53c96461bab 100644
--- a/dlls/d2d1/d2d1_private.h
+++ b/dlls/d2d1/d2d1_private.h
@@ -590,6 +590,7 @@ struct d2d_effect
 };
 
 HRESULT d2d_effect_init(struct d2d_effect *effect, ID2D1Factory *factory, const CLSID *effect_id) DECLSPEC_HIDDEN;
+struct d2d_effect *unsafe_impl_from_ID2D1Effect(ID2D1Effect *iface) DECLSPEC_HIDDEN;
 
 static inline BOOL d2d_array_reserve(void **elements, size_t *capacity, size_t count, size_t size)
 {
diff --git a/dlls/d2d1/effect.c b/dlls/d2d1/effect.c
index 601932b005b..0bf13c22bab 100644
--- a/dlls/d2d1/effect.c
+++ b/dlls/d2d1/effect.c
@@ -394,3 +394,11 @@ HRESULT d2d_effect_init(struct d2d_effect *effect, ID2D1Factory *factory, const
     WARN("Unsupported effect clsid %s.\n", debugstr_guid(effect_id));
     return E_FAIL;
 }
+
+struct d2d_effect *unsafe_impl_from_ID2D1Effect(ID2D1Effect *iface)
+{
+    if (!iface)
+        return NULL;
+    assert(iface->lpVtbl == (ID2D1EffectVtbl *)&d2d_effect_vtbl);
+    return CONTAINING_RECORD(iface, struct d2d_effect, ID2D1Effect_iface);
+}
-- 
2.25.1