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diff --git a/third_party/jpeg-xl/lib/extras/dec/jpegli.h b/third_party/jpeg-xl/lib/extras/dec/jpegli.h
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+++ b/third_party/jpeg-xl/lib/extras/dec/jpegli.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_EXTRAS_DEC_JPEGLI_H_
+#define LIB_EXTRAS_DEC_JPEGLI_H_
+
+// Decodes JPG pixels and metadata in memory using the libjpegli library.
+
+#include <jxl/types.h>
+#include <stdint.h>
+
+#include <vector>
+
+#include "lib/extras/packed_image.h"
+#include "lib/jxl/base/data_parallel.h"
+#include "lib/jxl/base/status.h"
+
+namespace jxl {
+namespace extras {
+
+struct JpegDecompressParams {
+  JxlDataType output_data_type = JXL_TYPE_UINT8;
+  JxlEndianness output_endianness = JXL_NATIVE_ENDIAN;
+  bool force_rgb = false;
+  bool force_grayscale = false;
+  int num_colors = 0;
+  bool two_pass_quant = true;
+  // 0 = none, 1 = ordered, 2 = Floyd-Steinberg
+  int dither_mode = 2;
+};
+
+Status DecodeJpeg(const std::vector<uint8_t>& compressed,
+                  const JpegDecompressParams& dparams, ThreadPool* pool,
+                  PackedPixelFile* ppf);
+
+}  // namespace extras
+}  // namespace jxl
+
+#endif  // LIB_EXTRAS_DEC_JPEGLI_H_