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/*
* Loongson MMI optimizations for libjpeg-turbo
*
* Copyright (C) 2015, 2018-2019, D. R. Commander. All Rights Reserved.
* Copyright (C) 2016-2017, Loongson Technology Corporation Limited, BeiJing.
* All Rights Reserved.
* Authors: ZhuChen <zhuchen@loongson.cn>
* CaiWanwei <caiwanwei@loongson.cn>
* SunZhangzhi <sunzhangzhi-cq@loongson.cn>
*
* Based on the x86 SIMD extension for IJG JPEG library
* Copyright (C) 1999-2006, MIYASAKA Masaru.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/
/* CHROMA DOWNSAMPLING */
#include "jsimd_mmi.h"
#include "jcsample.h"
void jsimd_h2v2_downsample_mmi(JDIMENSION image_width, int max_v_samp_factor,
JDIMENSION v_samp_factor,
JDIMENSION width_in_blocks,
JSAMPARRAY input_data, JSAMPARRAY output_data)
{
int inrow, outrow, outcol;
JDIMENSION output_cols = width_in_blocks * DCTSIZE;
JSAMPROW inptr0, inptr1, outptr;
__m64 bias, mask = 0.0, thisavg, nextavg, avg;
__m64 this0o, this0e, this0, this0sum, next0o, next0e, next0, next0sum;
__m64 this1o, this1e, this1, this1sum, next1o, next1e, next1, next1sum;
expand_right_edge(input_data, max_v_samp_factor, image_width,
output_cols * 2);
bias = _mm_set1_pi32((1 << 17) + 1); /* 0x00020001 (32-bit bias pattern) */
/* bias={1, 2, 1, 2} (16-bit) */
mask = _mm_cmpeq_pi16(mask, mask);
mask = _mm_srli_pi16(mask, BYTE_BIT); /* {0xFF 0x00 0xFF 0x00 ..} */
for (inrow = 0, outrow = 0; outrow < v_samp_factor;
inrow += 2, outrow++) {
inptr0 = input_data[inrow];
inptr1 = input_data[inrow + 1];
outptr = output_data[outrow];
for (outcol = output_cols; outcol > 0;
outcol -= 8, inptr0 += 16, inptr1 += 16, outptr += 8) {
this0 = _mm_load_si64((__m64 *)&inptr0[0]);
this1 = _mm_load_si64((__m64 *)&inptr1[0]);
next0 = _mm_load_si64((__m64 *)&inptr0[8]);
next1 = _mm_load_si64((__m64 *)&inptr1[8]);
this0o = _mm_and_si64(this0, mask);
this0e = _mm_srli_pi16(this0, BYTE_BIT);
this1o = _mm_and_si64(this1, mask);
this1e = _mm_srli_pi16(this1, BYTE_BIT);
this0sum = _mm_add_pi16(this0o, this0e);
this1sum = _mm_add_pi16(this1o, this1e);
next0o = _mm_and_si64(next0, mask);
next0e = _mm_srli_pi16(next0, BYTE_BIT);
next1o = _mm_and_si64(next1, mask);
next1e = _mm_srli_pi16(next1, BYTE_BIT);
next0sum = _mm_add_pi16(next0o, next0e);
next1sum = _mm_add_pi16(next1o, next1e);
thisavg = _mm_add_pi16(this0sum, this1sum);
nextavg = _mm_add_pi16(next0sum, next1sum);
thisavg = _mm_add_pi16(thisavg, bias);
nextavg = _mm_add_pi16(nextavg, bias);
thisavg = _mm_srli_pi16(thisavg, 2);
nextavg = _mm_srli_pi16(nextavg, 2);
avg = _mm_packs_pu16(thisavg, nextavg);
_mm_store_si64((__m64 *)&outptr[0], avg);
}
}
}
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