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diff --git a/media/libjxl/src/lib/jxl/enc_xyb.h b/media/libjxl/src/lib/jxl/enc_xyb.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_XYB_H_
+#define LIB_JXL_ENC_XYB_H_
+
+// Converts to XYB color space.
+
+#include "lib/jxl/aux_out_fwd.h"
+#include "lib/jxl/base/compiler_specific.h"
+#include "lib/jxl/base/data_parallel.h"
+#include "lib/jxl/base/status.h"
+#include "lib/jxl/enc_bit_writer.h"
+#include "lib/jxl/image.h"
+#include "lib/jxl/image_bundle.h"
+
+namespace jxl {
+
+// Converts any color space to XYB. If `linear` is not null, returns `linear`
+// after filling it with a linear sRGB copy of `in`. Otherwise, returns `&in`.
+//
+// NOTE this return value can avoid an extra color conversion if `in` would
+// later be passed to JxlButteraugliComparator.
+const ImageBundle* ToXYB(const ImageBundle& in, ThreadPool* pool,
+                         Image3F* JXL_RESTRICT xyb, const JxlCmsInterface& cms,
+                         ImageBundle* JXL_RESTRICT linear = nullptr);
+
+// Bt.601 to match JPEG/JFIF. Outputs _signed_ YCbCr values suitable for DCT,
+// see F.1.1.3 of T.81 (because our data type is float, there is no need to add
+// a bias to make the values unsigned).
+Status RgbToYcbcr(const ImageF& r_plane, const ImageF& g_plane,
+                  const ImageF& b_plane, ImageF* y_plane, ImageF* cb_plane,
+                  ImageF* cr_plane, ThreadPool* pool);
+
+// DEPRECATED, used by opsin_image_wrapper.
+Image3F OpsinDynamicsImage(const Image3B& srgb8, const JxlCmsInterface& cms);
+
+// For opsin_image_test.
+void TestCubeRoot();
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_ENC_XYB_H_