1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libyuv/source/compare_common.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,42 @@
1.4 +/*
1.5 + * Copyright 2012 The LibYuv Project Authors. All rights reserved.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license
1.8 + * that can be found in the LICENSE file in the root of the source
1.9 + * tree. An additional intellectual property rights grant can be found
1.10 + * in the file PATENTS. All contributing project authors may
1.11 + * be found in the AUTHORS file in the root of the source tree.
1.12 + */
1.13 +
1.14 +#include "libyuv/basic_types.h"
1.15 +
1.16 +#ifdef __cplusplus
1.17 +namespace libyuv {
1.18 +extern "C" {
1.19 +#endif
1.20 +
1.21 +uint32 SumSquareError_C(const uint8* src_a, const uint8* src_b, int count) {
1.22 + uint32 sse = 0u;
1.23 + int i;
1.24 + for (i = 0; i < count; ++i) {
1.25 + int diff = src_a[i] - src_b[i];
1.26 + sse += (uint32)(diff * diff);
1.27 + }
1.28 + return sse;
1.29 +}
1.30 +
1.31 +// hash seed of 5381 recommended.
1.32 +// Internal C version of HashDjb2 with int sized count for efficiency.
1.33 +uint32 HashDjb2_C(const uint8* src, int count, uint32 seed) {
1.34 + uint32 hash = seed;
1.35 + int i;
1.36 + for (i = 0; i < count; ++i) {
1.37 + hash += (hash << 5) + src[i];
1.38 + }
1.39 + return hash;
1.40 +}
1.41 +
1.42 +#ifdef __cplusplus
1.43 +} // extern "C"
1.44 +} // namespace libyuv
1.45 +#endif
