ref: 8d488e8c3b301804bf0287a27f06972affa96378
dir: /vpx_dsp/mips/add_noise_msa.c/
/*
* Copyright (c) 2015 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 <stdlib.h>
#include "./vpx_dsp_rtcd.h"
#include "vpx_dsp/mips/macros_msa.h"
void vpx_plane_add_noise_msa(uint8_t *start_ptr, const int8_t *noise,
int blackclamp, int whiteclamp, int width,
int height, int32_t pitch) {
int i, j;
v16u8 pos0, pos1, ref0, ref1;
v16i8 black_clamp, white_clamp, both_clamp;
black_clamp = __msa_fill_b(blackclamp);
white_clamp = __msa_fill_b(whiteclamp);
both_clamp = black_clamp + white_clamp;
both_clamp = -both_clamp;
for (i = 0; i < height / 2; ++i) {
uint8_t *pos0_ptr = start_ptr + (2 * i) * pitch;
const int8_t *ref0_ptr = noise + (rand() & 0xff);
uint8_t *pos1_ptr = start_ptr + (2 * i + 1) * pitch;
const int8_t *ref1_ptr = noise + (rand() & 0xff);
for (j = width / 16; j--;) {
pos0 = LD_UB(pos0_ptr);
ref0 = LD_UB(ref0_ptr);
pos1 = LD_UB(pos1_ptr);
ref1 = LD_UB(ref1_ptr);
pos0 = __msa_subsus_u_b(pos0, black_clamp);
pos1 = __msa_subsus_u_b(pos1, black_clamp);
pos0 = __msa_subsus_u_b(pos0, both_clamp);
pos1 = __msa_subsus_u_b(pos1, both_clamp);
pos0 = __msa_subsus_u_b(pos0, white_clamp);
pos1 = __msa_subsus_u_b(pos1, white_clamp);
pos0 += ref0;
ST_UB(pos0, pos0_ptr);
pos1 += ref1;
ST_UB(pos1, pos1_ptr);
pos0_ptr += 16;
pos1_ptr += 16;
ref0_ptr += 16;
ref1_ptr += 16;
}
}
}