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diff --git a/third_party/jpeg-xl/lib/jxl/dec_noise.h b/third_party/jpeg-xl/lib/jxl/dec_noise.h
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+++ b/third_party/jpeg-xl/lib/jxl/dec_noise.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_DEC_NOISE_H_
+#define LIB_JXL_DEC_NOISE_H_
+
+// Noise synthesis. Currently disabled.
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "lib/jxl/base/status.h"
+#include "lib/jxl/chroma_from_luma.h"
+#include "lib/jxl/dec_bit_reader.h"
+#include "lib/jxl/image.h"
+#include "lib/jxl/noise.h"
+
+namespace jxl {
+
+void Random3Planes(size_t visible_frame_index, size_t nonvisible_frame_index,
+                   size_t x0, size_t y0, const std::pair<ImageF*, Rect>& plane0,
+                   const std::pair<ImageF*, Rect>& plane1,
+                   const std::pair<ImageF*, Rect>& plane2);
+
+// Must only call if FrameHeader.flags.kNoise.
+Status DecodeNoise(BitReader* br, NoiseParams* noise_params);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_DEC_NOISE_H_