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100 lines
3.5 KiB
C
100 lines
3.5 KiB
C
/*
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* Loongson MMI optimizations for libjpeg-turbo
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*
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* Copyright (C) 2015, 2018, D. R. Commander. All Rights Reserved.
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* Copyright (C) 2016-2017, Loongson Technology Corporation Limited, BeiJing.
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* All Rights Reserved.
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* Authors: ZhuChen <zhuchen@loongson.cn>
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* CaiWanwei <caiwanwei@loongson.cn>
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* SunZhangzhi <sunzhangzhi-cq@loongson.cn>
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*
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* Based on the x86 SIMD extension for IJG JPEG library
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* Copyright (C) 1999-2006, MIYASAKA Masaru.
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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/* CHROMA DOWNSAMPLING */
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#include "jsimd_mmi.h"
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#include "jcsample.h"
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void jsimd_h2v2_downsample_mmi(JDIMENSION image_width, int max_v_samp_factor,
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JDIMENSION v_samp_factor,
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JDIMENSION width_in_blocks,
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JSAMPARRAY input_data, JSAMPARRAY output_data)
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{
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int inrow, outrow, outcol, bias;
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JDIMENSION output_cols = width_in_blocks * DCTSIZE;
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JSAMPROW inptr0, inptr1, outptr;
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__m64 mm0, mm1, mm2, mm3, mm4, mm5, mm6 = 0.0, mm7;
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expand_right_edge(input_data, max_v_samp_factor, image_width,
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output_cols * 2);
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bias = (1 << 17) + 1; /* 0x00020001 (bias pattern) */
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mm7 = _mm_set1_pi32(bias); /* mm7={1, 2, 1, 2} */
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mm6 = _mm_cmpeq_pi16(mm6, mm6);
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mm6 = _mm_srli_pi16(mm6, BYTE_BIT); /* mm6={0xFF 0x00 0xFF 0x00 ..} */
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for (inrow = 0, outrow = 0; outrow < v_samp_factor;
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inrow += 2, outrow++) {
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inptr0 = input_data[inrow];
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inptr1 = input_data[inrow + 1];
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outptr = output_data[outrow];
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for (outcol = output_cols; outcol > 0;
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outcol -= 8, inptr0 += 16, inptr1 += 16, outptr += 8) {
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mm0 = _mm_load_si64((__m64 *)&inptr0[0]);
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mm1 = _mm_load_si64((__m64 *)&inptr1[0]);
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mm2 = _mm_load_si64((__m64 *)&inptr0[8]);
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mm3 = _mm_load_si64((__m64 *)&inptr1[8]);
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mm4 = mm0;
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mm5 = mm1;
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mm0 = _mm_and_si64(mm0, mm6);
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mm4 = _mm_srli_pi16(mm4, BYTE_BIT);
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mm1 = _mm_and_si64(mm1, mm6);
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mm5 = _mm_srli_pi16(mm5, BYTE_BIT);
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mm0 = _mm_add_pi16(mm0, mm4);
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mm1 = _mm_add_pi16(mm1, mm5);
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mm4 = mm2;
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mm5 = mm3;
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mm2 = _mm_and_si64(mm2, mm6);
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mm4 = _mm_srli_pi16(mm4, BYTE_BIT);
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mm3 = _mm_and_si64(mm3, mm6);
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mm5 = _mm_srli_pi16(mm5, BYTE_BIT);
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mm2 = _mm_add_pi16(mm2, mm4);
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mm3 = _mm_add_pi16(mm3, mm5);
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mm0 = _mm_add_pi16(mm0, mm1);
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mm2 = _mm_add_pi16(mm2, mm3);
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mm0 = _mm_add_pi16(mm0, mm7);
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mm2 = _mm_add_pi16(mm2, mm7);
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mm0 = _mm_srli_pi16(mm0, 2);
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mm2 = _mm_srli_pi16(mm2, 2);
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mm0 = _mm_packs_pu16(mm0, mm2);
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_mm_store_si64((__m64 *)&outptr[0], mm0);
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}
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}
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}
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