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diff --git a/third_party/jpeg-xl/lib/jxl/epf.h b/third_party/jpeg-xl/lib/jxl/epf.h
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+++ b/third_party/jpeg-xl/lib/jxl/epf.h
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+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#ifndef LIB_JXL_EPF_H_
+#define LIB_JXL_EPF_H_
+
+// Fast SIMD "in-loop" edge preserving filter (adaptive, nonlinear).
+
+#include <stddef.h>
+
+#include "lib/jxl/base/data_parallel.h"
+#include "lib/jxl/base/status.h"
+#include "lib/jxl/dec_cache.h"
+#include "lib/jxl/passes_state.h"
+
+namespace jxl {
+
+// 4 * (sqrt(0.5)-1), so that Weight(sigma) = 0.5.
+static constexpr float kInvSigmaNum = -1.1715728752538099024f;
+
+// kInvSigmaNum / 0.3
+constexpr float kMinSigma = -3.90524291751269967465540850526868f;
+
+// Fills the `state->filter_weights.sigma` image with the precomputed sigma
+// values in the area inside `block_rect`. Accesses the AC strategy, quant field
+// and epf_sharpness fields in the corresponding positions.
+void ComputeSigma(const Rect& block_rect, PassesDecoderState* state);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_EPF_H_