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diff --git a/third_party/jpeg-xl/lib/extras/dec/jpg.h b/third_party/jpeg-xl/lib/extras/dec/jpg.h
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+++ b/third_party/jpeg-xl/lib/extras/dec/jpg.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_JPG_H_
+#define LIB_EXTRAS_DEC_JPG_H_
+
+// Decodes JPG pixels and metadata in memory.
+
+#include <stdint.h>
+
+#include "lib/extras/codec.h"
+#include "lib/extras/dec/color_hints.h"
+#include "lib/jxl/base/data_parallel.h"
+#include "lib/jxl/base/padded_bytes.h"
+#include "lib/jxl/base/span.h"
+#include "lib/jxl/base/status.h"
+
+namespace jxl {
+
+struct SizeConstraints;
+
+namespace extras {
+
+struct JPGDecompressParams {
+  int num_colors = 0;
+  bool two_pass_quant = false;
+  // 0 = none, 1 = ordered, 2 = Floyd-Steinberg
+  int dither_mode = 0;
+};
+
+// Decodes `bytes` into `ppf`. color_hints are ignored.
+// `elapsed_deinterleave`, if non-null, will be set to the time (in seconds)
+// that it took to deinterleave the raw JSAMPLEs to planar floats.
+Status DecodeImageJPG(Span<const uint8_t> bytes, const ColorHints& color_hints,
+                      PackedPixelFile* ppf,
+                      const SizeConstraints* constraints = nullptr,
+                      const JPGDecompressParams* dparams = nullptr);
+
+}  // namespace extras
+}  // namespace jxl
+
+#endif  // LIB_EXTRAS_DEC_JPG_H_