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+/*
+ * Copyright 2020 The libgav1 Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LIBGAV1_TESTS_BLOCK_UTILS_H_
+#define LIBGAV1_TESTS_BLOCK_UTILS_H_
+
+#include <cstdint>
+
+namespace libgav1 {
+namespace test_utils {
+
+//------------------------------------------------------------------------------
+// Prints |block| pixel by pixel with |width| pixels per row if |print_padding|
+// is false, |stride| otherwise. If |print_padding| is true padding pixels are
+// surrounded in '[]'.
+template <typename Pixel>
+void PrintBlock(const Pixel* block, int width, int height, int stride,
+                bool print_padding = false);
+
+extern template void PrintBlock(const uint8_t* block, int width, int height,
+                                int stride, bool print_padding /*= false*/);
+extern template void PrintBlock(const uint16_t* block, int width, int height,
+                                int stride, bool print_padding /*= false*/);
+
+//------------------------------------------------------------------------------
+// Compares |block1| and |block2| pixel by pixel checking |width| pixels per row
+// if |check_padding| is false, min(|stride1|, |stride2|) pixels otherwise.
+// Prints the blocks with differences marked with a '*' if |print_diff| is
+// true (the default).
+
+template <typename Pixel>
+bool CompareBlocks(const Pixel* block1, const Pixel* block2, int width,
+                   int height, int stride1, int stride2, bool check_padding,
+                   bool print_diff = true);
+
+extern template bool CompareBlocks(const uint8_t* block1, const uint8_t* block2,
+                                   int width, int height, int stride1,
+                                   int stride2, bool check_padding,
+                                   bool print_diff /*= true*/);
+extern template bool CompareBlocks(const uint16_t* block1,
+                                   const uint16_t* block2, int width,
+                                   int height, int stride1, int stride2,
+                                   bool check_padding,
+                                   bool print_diff /*= true*/);
+
+}  // namespace test_utils
+}  // namespace libgav1
+
+#endif  // LIBGAV1_TESTS_BLOCK_UTILS_H_