import libyuv at hash 38d37a5 from https://chromium.googlesource.com/libyuv/libyuv/

libs/libyuv/util/ssim.h

@@ -0,0 +1,36 @@
+/*
+ *  Copyright 2013 The LibYuv 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 in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS. All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// Get SSIM for video sequence. Assuming RAW 4:2:0 Y:Cb:Cr format
+
+#ifndef UTIL_SSIM_H_  // NOLINT
+#define UTIL_SSIM_H_
+
+#include <math.h>  // For log10()
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if !defined(INT_TYPES_DEFINED) && !defined(UINT8_TYPE_DEFINED)
+typedef unsigned char uint8;
+#define UINT8_TYPE_DEFINED
+#endif
+
+double CalcSSIM(const uint8* org, const uint8* rec,
+                const int image_width, const int image_height);
+
+double CalcLSSIM(double ssim);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // UTIL_SSIM_H_  // NOLINT