43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
/*
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* Copyright 2012 The LibYuv Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "libyuv/basic_types.h"
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#ifdef __cplusplus
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namespace libyuv {
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extern "C" {
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#endif
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uint32 SumSquareError_C(const uint8* src_a, const uint8* src_b, int count) {
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uint32 sse = 0u;
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int i;
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for (i = 0; i < count; ++i) {
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int diff = src_a[i] - src_b[i];
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sse += (uint32)(diff * diff);
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}
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return sse;
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}
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// hash seed of 5381 recommended.
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// Internal C version of HashDjb2 with int sized count for efficiency.
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uint32 HashDjb2_C(const uint8* src, int count, uint32 seed) {
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uint32 hash = seed;
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int i;
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for (i = 0; i < count; ++i) {
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hash += (hash << 5) + src[i];
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}
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return hash;
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}
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#ifdef __cplusplus
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} // extern "C"
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} // namespace libyuv
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#endif
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