evr/presenter: Make GetCurrentImage() work without output window.

dlls/evr/presenter.c

@@ -492,27 +492,28 @@ static void video_presenter_sample_present(struct video_presenter *presenter, IM
     IDirect3DDevice9 *device;
     HRESULT hr;
 
-    if (!presenter->swapchain)
-        return;
-
     if (FAILED(hr = video_presenter_get_sample_surface(sample, &surface)))
     {
         WARN("Failed to get sample surface, hr %#lx.\n", hr);
         return;
     }
 
-    if (FAILED(hr = IDirect3DSwapChain9_GetBackBuffer(presenter->swapchain, 0, D3DBACKBUFFER_TYPE_MONO, &backbuffer)))
+    if (presenter->swapchain)
     {
-        WARN("Failed to get a backbuffer, hr %#lx.\n", hr);
-        IDirect3DSurface9_Release(surface);
-        return;
-    }
+        if (SUCCEEDED(hr = IDirect3DSwapChain9_GetBackBuffer(presenter->swapchain, 0, D3DBACKBUFFER_TYPE_MONO, &backbuffer)))
+        {
+            IDirect3DSwapChain9_GetDevice(presenter->swapchain, &device);
+            IDirect3DDevice9_StretchRect(device, surface, NULL, backbuffer, NULL, D3DTEXF_POINT);
 
-    IDirect3DSwapChain9_GetDevice(presenter->swapchain, &device);
-    IDirect3DDevice9_StretchRect(device, surface, NULL, backbuffer, NULL, D3DTEXF_POINT);
+            IDirect3DSwapChain9_Present(presenter->swapchain, NULL, NULL, NULL, NULL, 0);
+            presenter->frame_stats.presented++;
 
-    IDirect3DSwapChain9_Present(presenter->swapchain, NULL, NULL, NULL, NULL, 0);
-    presenter->frame_stats.presented++;
+            IDirect3DDevice9_Release(device);
+            IDirect3DSurface9_Release(backbuffer);
+        }
+        else
+            WARN("Failed to get a backbuffer, hr %#lx.\n", hr);
+    }
 
     EnterCriticalSection(&presenter->cs);
     if (presenter->thread.queue.last_presented)
@@ -521,8 +522,6 @@ static void video_presenter_sample_present(struct video_presenter *presenter, IM
     IMFSample_AddRef(presenter->thread.queue.last_presented);
     LeaveCriticalSection(&presenter->cs);
 
-    IDirect3DDevice9_Release(device);
-    IDirect3DSurface9_Release(backbuffer);
     IDirect3DSurface9_Release(surface);
 }
 
@@ -1493,13 +1492,13 @@ static HRESULT WINAPI video_presenter_control_GetCurrentImage(IMFVideoDisplayCon
     sample = presenter->thread.queue.last_presented;
     presenter->thread.queue.last_presented = NULL;
 
-    if (!presenter->swapchain || !sample)
+    if (!sample)
     {
         hr = MF_E_INVALIDREQUEST;
     }
     else if (SUCCEEDED(hr = video_presenter_get_sample_surface(sample, &surface)))
     {
-        IDirect3DSwapChain9_GetDevice(presenter->swapchain, &device);
+        IDirect3DSurface9_GetDevice(surface, &device);
         IDirect3DSurface9_GetDesc(surface, &surface_desc);
 
         if (surface_desc.Format != D3DFMT_X8R8G8B8)