d2d1: Reject D2D1_ALPHA_MODE_STRAIGHT alpha mode for HWND targets.

dlls/d2d1/hwnd_render_target.c

@@ -862,6 +862,13 @@ HRESULT d2d_hwnd_render_target_init(struct d2d_hwnd_render_target *render_target
     if (dxgi_rt_desc.pixelFormat.alphaMode == D2D1_ALPHA_MODE_UNKNOWN)
         dxgi_rt_desc.pixelFormat.alphaMode = D2D1_ALPHA_MODE_IGNORE;
 
+    if (dxgi_rt_desc.pixelFormat.alphaMode == D2D1_ALPHA_MODE_STRAIGHT)
+    {
+        IDXGIFactory_Release(dxgi_factory);
+        WARN("Alpha mode %u is not supported.\n", dxgi_rt_desc.pixelFormat.alphaMode);
+        return D2DERR_UNSUPPORTED_PIXEL_FORMAT;
+    }
+
     render_target->desc = dxgi_rt_desc;
     /* FIXME: should be resolved to either HW or SW type. */
     if (render_target->desc.type == D2D1_RENDER_TARGET_TYPE_DEFAULT)

dlls/d2d1/tests/d2d1.c

@@ -6214,10 +6214,7 @@ static void test_hwnd_target(BOOL d3d11)
         hr = ID2D1Factory_CreateHwndRenderTarget(ctx.factory, &desc, &hwnd_rt_desc, &rt);
         if (format_tests[i].expected_failure)
         {
-            todo_wine
-            ok(FAILED(hr), "Got unexpected hr %#lx.\n", hr);
-            if (SUCCEEDED(hr))
-                ID2D1HwndRenderTarget_Release(rt);
+            ok(hr == D2DERR_UNSUPPORTED_PIXEL_FORMAT, "Got unexpected hr %#lx.\n", hr);
             winetest_pop_context();
             continue;
         }