/*
* Copyright (c) 2013 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 <assert.h>
#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_convolve8_neon(
const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst,
ptrdiff_t dst_stride,
const InterpKernel *filter,
int x0_q4,
int x_step_q4,
int y0_q4,
int y_step_q4,
int w,
int h) {
// Given our constraints: w <= 64, h <= 64, taps <= 8 we can reduce the
// maximum buffer size to 64 * (64 + 7) (+1 row to make it divisible by 4).
DECLARE_ALIGNED(32, uint8_t, im_block[64 * 72]);
const int im_stride = 64;
const int vert_filter_taps = vpx_get_filter_taps(filter[y0_q4]) <= 4 ? 4 : 8;
// Account for the vertical phase needing vert_filter_taps / 2 - 1 lines prior
// and vert_filter_taps / 2 lines post. (+1 to make total divisible by 4.)
const int im_height = h + vert_filter_taps;
const ptrdiff_t border_offset = vert_filter_taps / 2 - 1;
assert(y_step_q4 == 16);
assert(x_step_q4 == 16);
// Filter starting border_offset rows back. The Neon implementation will
// ignore the given height and filter a multiple of 4 lines. Since this goes
// into the temporary buffer which has lots of extra room and is subsequently
// discarded this is safe if somewhat less than ideal.
vpx_convolve8_horiz_neon(src - src_stride * border_offset, src_stride,
im_block, im_stride, filter, x0_q4, x_step_q4, y0_q4,
y_step_q4, w, im_height);
// Step into the temporary buffer border_offset rows to get actual frame data.
vpx_convolve8_vert_neon(im_block + im_stride * border_offset, im_stride, dst,
dst_stride, filter, x0_q4, x_step_q4, y0_q4,
y_step_q4, w, h);
}
void vpx_convolve8_avg_neon(
const uint8_t *src, ptrdiff_t src_stride,
uint8_t *dst, ptrdiff_t dst_stride,
const InterpKernel *filter,
int x0_q4,
int x_step_q4,
int y0_q4,
int y_step_q4,
int w,
int h) {
DECLARE_ALIGNED(32, uint8_t, im_block[64 * 72]);
const int im_stride = 64;
const int im_height = h + SUBPEL_TAPS;
const ptrdiff_t border_offset = SUBPEL_TAPS / 2 - 1;
assert(y_step_q4 == 16);
assert(x_step_q4 == 16);
// This implementation has the same issues as above. In addition, we only want
// to average the values after both passes.
vpx_convolve8_horiz_neon(src - src_stride * border_offset, src_stride,
im_block, im_stride, filter, x0_q4, x_step_q4, y0_q4,
y_step_q4, w, im_height);
vpx_convolve8_avg_vert_neon(im_block + im_stride * border_offset, im_stride,
dst, dst_stride, filter, x0_q4, x_step_q4, y0_q4,
y_step_q4, w, h);
}
