ref: 7498fe2e542183ff6e8091608ae57fade2bde4ee
dir: /vpx_dsp/arm/highbd_vpx_convolve_neon.c/
/*
* Copyright (c) 2016 The WebM 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 "./vpx_dsp_rtcd.h"
#include "vpx_dsp/vpx_dsp_common.h"
#include "vpx_dsp/vpx_filter.h"
#include "vpx_ports/mem.h"
void vpx_highbd_convolve8_neon(const uint16_t *src, ptrdiff_t src_stride,
uint16_t *dst, ptrdiff_t dst_stride,
const int16_t *filter_x, int x_step_q4,
const int16_t *filter_y, int y_step_q4, int w,
int h, int bd) {
const int y0_q4 = get_filter_offset(filter_y, get_filter_base(filter_y));
// + 1 to make it divisible by 4
DECLARE_ALIGNED(16, uint16_t, temp[64 * 136]);
const int intermediate_height =
(((h - 1) * y_step_q4 + y0_q4) >> SUBPEL_BITS) + SUBPEL_TAPS;
/* Filter starting 3 lines back. The neon implementation will ignore the given
* height and filter a multiple of 4 lines. Since this goes in to the temp
* buffer which has lots of extra room and is subsequently discarded this is
* safe if somewhat less than ideal. */
vpx_highbd_convolve8_horiz_neon(src - src_stride * 3, src_stride, temp, w,
filter_x, x_step_q4, filter_y, y_step_q4, w,
intermediate_height, bd);
/* Step into the temp buffer 3 lines to get the actual frame data */
vpx_highbd_convolve8_vert_neon(temp + w * 3, w, dst, dst_stride, filter_x,
x_step_q4, filter_y, y_step_q4, w, h, bd);
}
void vpx_highbd_convolve8_avg_neon(const uint16_t *src, ptrdiff_t src_stride,
uint16_t *dst, ptrdiff_t dst_stride,
const int16_t *filter_x, int x_step_q4,
const int16_t *filter_y, int y_step_q4,
int w, int h, int bd) {
const int y0_q4 = get_filter_offset(filter_y, get_filter_base(filter_y));
// + 1 to make it divisible by 4
DECLARE_ALIGNED(16, uint16_t, temp[64 * 136]);
const int intermediate_height =
(((h - 1) * y_step_q4 + y0_q4) >> SUBPEL_BITS) + SUBPEL_TAPS;
/* This implementation has the same issues as above. In addition, we only want
* to average the values after both passes.
*/
vpx_highbd_convolve8_horiz_neon(src - src_stride * 3, src_stride, temp, w,
filter_x, x_step_q4, filter_y, y_step_q4, w,
intermediate_height, bd);
vpx_highbd_convolve8_avg_vert_neon(temp + w * 3, w, dst, dst_stride, filter_x,
x_step_q4, filter_y, y_step_q4, w, h, bd);
}