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/**
*
* Copyright 2016-2020 Netflix, Inc.
*
* Licensed under the BSD+Patent License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://opensource.org/licenses/BSDplusPatent
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#ifndef FEATURE_MOTION_H_
#define FEATURE_MOTION_H_
#include <stdbool.h>
#include <stdint.h>
static const uint16_t filter[5] = { 3571, 16004, 26386, 16004, 3571 };
static const int filter_width = sizeof(filter) / sizeof(filter[0]);
static inline uint32_t
edge_16(bool horizontal, const uint16_t *src, int width,
int height, int stride, int i, int j)
{
const int radius = filter_width / 2;
uint32_t accum = 0;
// MIRROR | ЯOЯЯIM
for (unsigned k = 0; k < filter_width; ++k) {
int i_tap = horizontal ? i : i - radius + k;
int j_tap = horizontal ? j - radius + k : j;
if (horizontal) {
if (j_tap < 0)
j_tap = -j_tap;
else if (j_tap >= width)
j_tap = width - (j_tap - width + 1);
} else {
if (i_tap < 0)
i_tap = -i_tap;
else if (i_tap >= height)
i_tap = height - (i_tap - height + 1);
}
accum += filter[k] * src[i_tap * stride + j_tap];
}
return accum;
}
#endif /* _FEATURE_MOTION_H_ */