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diff --git a/third_party/jpeg-xl/lib/jxl/enc_external_image.h b/third_party/jpeg-xl/lib/jxl/enc_external_image.h
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+++ b/third_party/jpeg-xl/lib/jxl/enc_external_image.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_ENC_EXTERNAL_IMAGE_H_
+#define LIB_JXL_ENC_EXTERNAL_IMAGE_H_
+
+// Interleaved image for color transforms and Codec.
+
+#include <jxl/types.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include "lib/jxl/base/data_parallel.h"
+#include "lib/jxl/base/padded_bytes.h"
+#include "lib/jxl/base/status.h"
+#include "lib/jxl/color_encoding_internal.h"
+#include "lib/jxl/image.h"
+#include "lib/jxl/image_bundle.h"
+
+namespace jxl {
+Status ConvertFromExternal(Span<const uint8_t> bytes, size_t xsize,
+                           size_t ysize, size_t bits_per_sample,
+                           JxlPixelFormat format, size_t c, ThreadPool* pool,
+                           ImageF* channel);
+
+// Convert an interleaved pixel buffer to the internal ImageBundle
+// representation. This is the opposite of ConvertToExternal().
+Status ConvertFromExternal(Span<const uint8_t> bytes, size_t xsize,
+                           size_t ysize, const ColorEncoding& c_current,
+                           size_t bits_per_sample, JxlPixelFormat format,
+                           ThreadPool* pool, ImageBundle* ib);
+Status BufferToImageF(const JxlPixelFormat& pixel_format, size_t xsize,
+                      size_t ysize, const void* buffer, size_t size,
+                      ThreadPool* pool, ImageF* channel);
+Status BufferToImageBundle(const JxlPixelFormat& pixel_format, uint32_t xsize,
+                           uint32_t ysize, const void* buffer, size_t size,
+                           jxl::ThreadPool* pool,
+                           const jxl::ColorEncoding& c_current,
+                           jxl::ImageBundle* ib);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_ENC_EXTERNAL_IMAGE_H_