ref: 3e2562bdb9d6da989edfa6dbe1d80836f95c2fdd
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; } } }