The Tor Browser: media/libyuv/source/compare

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     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  */

    11 #include "libyuv/basic_types.h"

    13 #ifdef __cplusplus

    14 namespace libyuv {

    15 extern "C" {

    16 #endif

    18 uint32 SumSquareError_C(const uint8* src_a, const uint8* src_b, int count) {

    19   uint32 sse = 0u;

    20   int i;

    21   for (i = 0; i < count; ++i) {

    22     int diff = src_a[i] - src_b[i];

    23     sse += (uint32)(diff * diff);

    24   }

    25   return sse;

    26 }

    28 // hash seed of 5381 recommended.

    29 // Internal C version of HashDjb2 with int sized count for efficiency.

    30 uint32 HashDjb2_C(const uint8* src, int count, uint32 seed) {

    31   uint32 hash = seed;

    32   int i;

    33   for (i = 0; i < count; ++i) {

    34     hash += (hash << 5) + src[i];

    35   }

    36   return hash;

    37 }

    39 #ifdef __cplusplus

    40 }  // extern "C"

    41 }  // namespace libyuv

    42 #endif

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