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diff --git a/third_party/jpeg-xl/lib/jxl/dec_external_image.h b/third_party/jpeg-xl/lib/jxl/dec_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_DEC_EXTERNAL_IMAGE_H_
+#define LIB_JXL_DEC_EXTERNAL_IMAGE_H_
+
+// Interleaved image for color transforms and Codec.
+
+#include <jxl/decode.h>
+#include <jxl/types.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#include "lib/jxl/base/status.h"
+#include "lib/jxl/color_encoding_internal.h"
+#include "lib/jxl/dec_cache.h"
+#include "lib/jxl/image.h"
+#include "lib/jxl/image_bundle.h"
+
+namespace jxl {
+
+// Converts ib to interleaved void* pixel buffer with the given format.
+// bits_per_sample: must be 16 or 32 if float_out is true, and at most 16
+// if it is false. No bit packing is done.
+// num_channels: must be 1, 2, 3 or 4 for gray, gray+alpha, RGB, RGB+alpha.
+// This supports the features needed for the C API and does not perform
+// color space conversion.
+// TODO(lode): support rectangle crop.
+// stride_out is output scanline size in bytes, must be >=
+// output_xsize * output_bytes_per_pixel.
+// undo_orientation is an EXIF orientation to undo. Depending on the
+// orientation, the output xsize and ysize are swapped compared to input
+// xsize and ysize.
+Status ConvertToExternal(const jxl::ImageBundle& ib, size_t bits_per_sample,
+                         bool float_out, size_t num_channels,
+                         JxlEndianness endianness, size_t stride_out,
+                         jxl::ThreadPool* thread_pool, void* out_image,
+                         size_t out_size, const PixelCallback& out_callback,
+                         jxl::Orientation undo_orientation,
+                         bool unpremul_alpha = false);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_DEC_EXTERNAL_IMAGE_H_