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diff --git a/third_party/jpeg-xl/lib/jxl/loop_filter.h b/third_party/jpeg-xl/lib/jxl/loop_filter.h
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+++ b/third_party/jpeg-xl/lib/jxl/loop_filter.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_LOOP_FILTER_H_
+#define LIB_JXL_LOOP_FILTER_H_
+
+// Parameters for loop filter(s), stored in each frame.
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "lib/jxl/base/compiler_specific.h"
+#include "lib/jxl/base/status.h"
+#include "lib/jxl/dec_bit_reader.h"
+#include "lib/jxl/field_encodings.h"
+
+namespace jxl {
+
+struct LoopFilter : public Fields {
+  LoopFilter();
+  JXL_FIELDS_NAME(LoopFilter)
+
+  Status VisitFields(Visitor* JXL_RESTRICT visitor) override;
+
+  size_t Padding() const {
+    static const size_t padding_per_epf_iter[4] = {0, 2, 3, 6};
+    return padding_per_epf_iter[epf_iters] + (gab ? 1 : 0);
+  }
+
+  mutable bool all_default;
+
+  // --- Gaborish convolution
+  bool gab;
+
+  bool gab_custom;
+  float gab_x_weight1;
+  float gab_x_weight2;
+  float gab_y_weight1;
+  float gab_y_weight2;
+  float gab_b_weight1;
+  float gab_b_weight2;
+
+  // --- Edge-preserving filter
+
+  // Number of EPF stages to apply. 0 means EPF disabled. 1 applies only the
+  // first stage, 2 applies both stages and 3 applies the first stage twice and
+  // the second stage once.
+  uint32_t epf_iters;
+
+  bool epf_sharp_custom;
+  enum { kEpfSharpEntries = 8 };
+  float epf_sharp_lut[kEpfSharpEntries];
+
+  bool epf_weight_custom;      // Custom weight params
+  float epf_channel_scale[3];  // Relative weight of each channel
+  float epf_pass1_zeroflush;   // Minimum weight for first pass
+  float epf_pass2_zeroflush;   // Minimum weight for second pass
+
+  bool epf_sigma_custom;        // Custom sigma parameters
+  float epf_quant_mul;          // Sigma is ~ this * quant
+  float epf_pass0_sigma_scale;  // Multiplier for sigma in pass 0
+  float epf_pass2_sigma_scale;  // Multiplier for sigma in the second pass
+  float epf_border_sad_mul;     // (inverse) multiplier for sigma on borders
+
+  float epf_sigma_for_modular;
+
+  uint64_t extensions;
+
+  bool nonserialized_is_modular = false;
+};
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_LOOP_FILTER_H_