| /* |
| * 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; |
| int i; |
| for (i = 0; i < count; ++i) { |
| int diff = src_a[i] - src_b[i]; |
| sse += (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; |
| int i; |
| for (i = 0; i < count; ++i) { |
| hash += (hash << 5) + src[i]; |
| } |
| return hash; |
| } |
| |
| #ifdef __cplusplus |
| } // extern "C" |
| } // namespace libyuv |
| #endif |
