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diff --git a/third_party/jpeg-xl/lib/jxl/dec_transforms_testonly.h b/third_party/jpeg-xl/lib/jxl/dec_transforms_testonly.h
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+++ b/third_party/jpeg-xl/lib/jxl/dec_transforms_testonly.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_TRANSFORMS_TESTONLY_H_
+#define LIB_JXL_DEC_TRANSFORMS_TESTONLY_H_
+
+// Facade for (non-inlined) inverse integral transforms.
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "lib/jxl/ac_strategy.h"
+#include "lib/jxl/base/compiler_specific.h"
+
+namespace jxl {
+
+void TransformToPixels(AcStrategy::Type strategy,
+                       float* JXL_RESTRICT coefficients,
+                       float* JXL_RESTRICT pixels, size_t pixels_stride,
+                       float* JXL_RESTRICT scratch_space);
+
+// Equivalent of the above for DC image.
+void LowestFrequenciesFromDC(const jxl::AcStrategy::Type strategy,
+                             const float* dc, size_t dc_stride, float* llf);
+
+void AFVIDCT4x4(const float* JXL_RESTRICT coeffs, float* JXL_RESTRICT pixels);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_DEC_TRANSFORMS_TESTONLY_H_