Imported Upstream version 0.9.0upstream/0.9.0upstream

Change-Id: I60862786d19d92bb65425923bfeaa8ec236d8722

1 files changed, 24 insertions, 0 deletions

diff --git a/lib/jxl/enc_linalg.h b/lib/jxl/enc_linalg.h
new file mode 100644
index 0000000..791770d
--- /dev/null
+++ b/lib/jxl/enc_linalg.h
@@ -0,0 +1,24 @@
+// 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_LINALG_H_
+#define LIB_JXL_LINALG_H_
+
+// Linear algebra.
+
+#include "lib/jxl/base/compiler_specific.h"
+#include "lib/jxl/image.h"
+
+namespace jxl {
+
+using ImageD = Plane<double>;
+
+// A is symmetric, U is orthogonal, and A = U * Diagonal(diag) * Transpose(U).
+void ConvertToDiagonal(const ImageD& A, ImageD* JXL_RESTRICT diag,
+                       ImageD* JXL_RESTRICT U);
+
+}  // namespace jxl
+
+#endif  // LIB_JXL_LINALG_H_