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-rw-r--r--gfx/thebes/AllOfDcomp.h40
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diff --git a/gfx/thebes/AllOfDcomp.h b/gfx/thebes/AllOfDcomp.h
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+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_gfx_AllOfDcomp_h
+#define mozilla_gfx_AllOfDcomp_h
+
+// Getting everything that we need in dcomp.h defined means messing with some
+// defines.
+
+#if (_WIN32_WINNT < _WIN32_WINNT_WIN10)
+
+# define XSTR(x) STR(x)
+# define STR(x) #x
+// clang-format off
+
+# pragma message "IDCompositionFilterEffect in dcomp.h requires _WIN32_WINNT >= _WIN32_WINNT_WIN10."
+// Pedantically, it actually requires _WIN32_WINNT_WINTHRESHOLD, but that's the
+// same as _WIN32_WINNT_WIN10.
+
+# pragma message "Forcing NTDDI_VERSION " XSTR(NTDDI_VERSION) " -> " XSTR(NTDDI_WIN10)
+# undef NTDDI_VERSION
+# define NTDDI_VERSION NTDDI_WIN10
+
+# pragma message "Forcing _WIN32_WINNT " XSTR(_WIN32_WINNT) " -> " XSTR(_WIN32_WINNT_WIN10)
+# undef _WIN32_WINNT
+# define _WIN32_WINNT _WIN32_WINNT_WIN10
+
+// clang-format on
+# undef STR
+# undef XSTR
+
+#endif
+
+// -
+
+#include <dcomp.h>
+
+#endif // mozilla_gfx_AllOfDcomp_h