mirror of https://github.com/axmolengine/axmol.git
99 lines
3.7 KiB
C
99 lines
3.7 KiB
C
/*
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* Loongson MMI optimizations for libjpeg-turbo
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*
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* Copyright (C) 2015, 2018-2019, 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;
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JDIMENSION output_cols = width_in_blocks * DCTSIZE;
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JSAMPROW inptr0, inptr1, outptr;
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__m64 bias, mask = 0.0, thisavg, nextavg, avg;
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__m64 this0o, this0e, this0, this0sum, next0o, next0e, next0, next0sum;
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__m64 this1o, this1e, this1, this1sum, next1o, next1e, next1, next1sum;
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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 = _mm_set1_pi32((1 << 17) + 1); /* 0x00020001 (32-bit bias pattern) */
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/* bias={1, 2, 1, 2} (16-bit) */
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mask = _mm_cmpeq_pi16(mask, mask);
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mask = _mm_srli_pi16(mask, BYTE_BIT); /* {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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this0 = _mm_load_si64((__m64 *)&inptr0[0]);
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this1 = _mm_load_si64((__m64 *)&inptr1[0]);
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next0 = _mm_load_si64((__m64 *)&inptr0[8]);
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next1 = _mm_load_si64((__m64 *)&inptr1[8]);
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this0o = _mm_and_si64(this0, mask);
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this0e = _mm_srli_pi16(this0, BYTE_BIT);
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this1o = _mm_and_si64(this1, mask);
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this1e = _mm_srli_pi16(this1, BYTE_BIT);
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this0sum = _mm_add_pi16(this0o, this0e);
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this1sum = _mm_add_pi16(this1o, this1e);
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next0o = _mm_and_si64(next0, mask);
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next0e = _mm_srli_pi16(next0, BYTE_BIT);
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next1o = _mm_and_si64(next1, mask);
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next1e = _mm_srli_pi16(next1, BYTE_BIT);
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next0sum = _mm_add_pi16(next0o, next0e);
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next1sum = _mm_add_pi16(next1o, next1e);
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thisavg = _mm_add_pi16(this0sum, this1sum);
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nextavg = _mm_add_pi16(next0sum, next1sum);
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thisavg = _mm_add_pi16(thisavg, bias);
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nextavg = _mm_add_pi16(nextavg, bias);
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thisavg = _mm_srli_pi16(thisavg, 2);
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nextavg = _mm_srli_pi16(nextavg, 2);
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avg = _mm_packs_pu16(thisavg, nextavg);
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_mm_store_si64((__m64 *)&outptr[0], avg);
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}
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}
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}
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