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diff --git a/src/prediction_mask.h b/src/prediction_mask.h
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+/*
+ * Copyright 2019 The libgav1 Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LIBGAV1_SRC_PREDICTION_MASK_H_
+#define LIBGAV1_SRC_PREDICTION_MASK_H_
+
+#include <cstddef>
+#include <cstdint>
+
+#include "src/utils/bit_mask_set.h"
+#include "src/utils/types.h"
+
+namespace libgav1 {
+
+constexpr BitMaskSet kIsWedgeCompoundModeAllowed(kBlock8x8, kBlock8x16,
+                                                 kBlock8x32, kBlock16x8,
+                                                 kBlock16x16, kBlock16x32,
+                                                 kBlock32x8, kBlock32x16,
+                                                 kBlock32x32);
+
+// This function generates wedge masks. It should be called only once for the
+// decoder. If the video is key frame only, we don't have to call this
+// function. Returns true on success, false on allocation failure.
+// 7.11.3.11.
+bool GenerateWedgeMask(WedgeMaskArray* wedge_masks);
+
+}  // namespace libgav1
+#endif  // LIBGAV1_SRC_PREDICTION_MASK_H_