Line data    Source code

       1             : /*
       2             :  *  Copyright 2012 The LibYuv Project Authors. All rights reserved.
       3             :  *
       4             :  *  Use of this source code is governed by a BSD-style license
       5             :  *  that can be found in the LICENSE file in the root of the source
       6             :  *  tree. An additional intellectual property rights grant can be found
       7             :  *  in the file PATENTS. All contributing project authors may
       8             :  *  be found in the AUTHORS file in the root of the source tree.
       9             :  */
      10             : 
      11             : #include "libyuv/basic_types.h"
      12             : 
      13             : #include "libyuv/compare_row.h"
      14             : 
      15             : #ifdef __cplusplus
      16             : namespace libyuv {
      17             : extern "C" {
      18             : #endif
      19             : 
      20           0 : uint32 SumSquareError_C(const uint8* src_a, const uint8* src_b, int count) {
      21           0 :   uint32 sse = 0u;
      22             :   int i;
      23           0 :   for (i = 0; i < count; ++i) {
      24           0 :     int diff = src_a[i] - src_b[i];
      25           0 :     sse += (uint32)(diff * diff);
      26             :   }
      27           0 :   return sse;
      28             : }
      29             : 
      30             : // hash seed of 5381 recommended.
      31             : // Internal C version of HashDjb2 with int sized count for efficiency.
      32           0 : uint32 HashDjb2_C(const uint8* src, int count, uint32 seed) {
      33           0 :   uint32 hash = seed;
      34             :   int i;
      35           0 :   for (i = 0; i < count; ++i) {
      36           0 :     hash += (hash << 5) + src[i];
      37             :   }
      38           0 :   return hash;
      39             : }
      40             : 
      41             : #ifdef __cplusplus
      42             : }  // extern "C"
      43             : }  // namespace libyuv
      44             : #endif