/* | |
* Copyright 2012 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. | |
*/ | |
#include "libyuv/basic_types.h" | |
#ifdef __cplusplus | |
namespace libyuv { | |
extern "C" { | |
#endif | |
uint32 SumSquareError_C(const uint8* src_a, const uint8* src_b, int count) { | |
uint32 sse = 0u; | |
for (int i = 0; i < count; ++i) { | |
int diff = src_a[i] - src_b[i]; | |
sse += static_cast<uint32>(diff * diff); | |
} | |
return sse; | |
} | |
// hash seed of 5381 recommended. | |
// Internal C version of HashDjb2 with int sized count for efficiency. | |
uint32 HashDjb2_C(const uint8* src, int count, uint32 seed) { | |
uint32 hash = seed; | |
for (int i = 0; i < count; ++i) { | |
hash += (hash << 5) + src[i]; | |
} | |
return hash; | |
} | |
#ifdef __cplusplus | |
} // extern "C" | |
} // namespace libyuv | |
#endif |