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diff --git a/third_party/dav1d/src/intra_edge.h b/third_party/dav1d/src/intra_edge.h
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+++ b/third_party/dav1d/src/intra_edge.h
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+/*
+ * Copyright © 2018, VideoLAN and dav1d authors
+ * Copyright © 2018, Two Orioles, LLC
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef DAV1D_SRC_INTRA_EDGE_H
+#define DAV1D_SRC_INTRA_EDGE_H
+
+enum EdgeFlags {
+    EDGE_I444_TOP_HAS_RIGHT = 1 << 0,
+    EDGE_I422_TOP_HAS_RIGHT = 1 << 1,
+    EDGE_I420_TOP_HAS_RIGHT = 1 << 2,
+    EDGE_I444_LEFT_HAS_BOTTOM = 1 << 3,
+    EDGE_I422_LEFT_HAS_BOTTOM = 1 << 4,
+    EDGE_I420_LEFT_HAS_BOTTOM = 1 << 5,
+};
+
+typedef struct EdgeNode EdgeNode;
+struct EdgeNode {
+    enum EdgeFlags o, h[2], v[2];
+};
+typedef struct EdgeTip {
+    EdgeNode node;
+    enum EdgeFlags split[4];
+} EdgeTip;
+typedef struct EdgeBranch {
+    EdgeNode node;
+    enum EdgeFlags tts[3], tbs[3], tls[3], trs[3], h4[4], v4[4];
+    EdgeNode *split[4];
+} EdgeBranch;
+
+void dav1d_init_mode_tree(EdgeNode *const root, EdgeTip *const nt,
+                          const int allow_sb128);
+
+#endif /* DAV1D_SRC_INTRA_EDGE_H */