229 lines
8.5 KiB
C
229 lines
8.5 KiB
C
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/*
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* AltiVec optimizations for libjpeg-turbo
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*
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* Copyright (C) 2014-2015, D. R. Commander. All Rights Reserved.
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* Copyright (C) 2014, Jay Foad. All Rights Reserved.
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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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/* This file is included by jcgray-altivec.c */
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void jsimd_rgb_gray_convert_altivec(JDIMENSION img_width, JSAMPARRAY input_buf,
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JSAMPIMAGE output_buf,
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JDIMENSION output_row, int num_rows)
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{
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JSAMPROW inptr, outptr;
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int pitch = img_width * RGB_PIXELSIZE, num_cols;
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#if __BIG_ENDIAN__
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int offset;
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unsigned char __attribute__((aligned(16))) tmpbuf[RGB_PIXELSIZE * 16];
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#endif
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__vector unsigned char rgb0, rgb1 = { 0 }, rgb2 = { 0 },
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rgbg0, rgbg1, rgbg2, rgbg3, y;
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#if __BIG_ENDIAN__ || RGB_PIXELSIZE == 4
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__vector unsigned char rgb3 = { 0 };
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#endif
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#if __BIG_ENDIAN__ && RGB_PIXELSIZE == 4
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__vector unsigned char rgb4 = { 0 };
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#endif
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__vector short rg0, rg1, rg2, rg3, bg0, bg1, bg2, bg3;
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__vector unsigned short yl, yh;
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__vector int y0, y1, y2, y3;
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/* Constants */
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__vector short pw_f0299_f0337 = { __4X2(F_0_299, F_0_337) },
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pw_f0114_f0250 = { __4X2(F_0_114, F_0_250) };
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__vector int pd_onehalf = { __4X(ONE_HALF) };
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__vector unsigned char pb_zero = { __16X(0) },
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#if __BIG_ENDIAN__
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shift_pack_index =
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{ 0, 1, 4, 5, 8, 9, 12, 13, 16, 17, 20, 21, 24, 25, 28, 29 };
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#else
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shift_pack_index =
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{ 2, 3, 6, 7, 10, 11, 14, 15, 18, 19, 22, 23, 26, 27, 30, 31 };
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#endif
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while (--num_rows >= 0) {
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inptr = *input_buf++;
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outptr = output_buf[0][output_row];
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output_row++;
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for (num_cols = pitch; num_cols > 0;
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num_cols -= RGB_PIXELSIZE * 16, inptr += RGB_PIXELSIZE * 16,
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outptr += 16) {
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#if __BIG_ENDIAN__
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/* Load 16 pixels == 48 or 64 bytes */
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offset = (size_t)inptr & 15;
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if (offset) {
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__vector unsigned char unaligned_shift_index;
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int bytes = num_cols + offset;
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if (bytes < (RGB_PIXELSIZE + 1) * 16 && (bytes & 15)) {
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/* Slow path to prevent buffer overread. Since there is no way to
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* read a partial AltiVec register, overread would occur on the last
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* chunk of the last image row if the right edge is not on a 16-byte
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* boundary. It could also occur on other rows if the bytes per row
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* is low enough. Since we can't determine whether we're on the last
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* image row, we have to assume every row is the last.
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*/
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memcpy(tmpbuf, inptr, min(num_cols, RGB_PIXELSIZE * 16));
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rgb0 = vec_ld(0, tmpbuf);
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rgb1 = vec_ld(16, tmpbuf);
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rgb2 = vec_ld(32, tmpbuf);
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#if RGB_PIXELSIZE == 4
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rgb3 = vec_ld(48, tmpbuf);
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#endif
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} else {
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/* Fast path */
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rgb0 = vec_ld(0, inptr);
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if (bytes > 16)
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rgb1 = vec_ld(16, inptr);
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if (bytes > 32)
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rgb2 = vec_ld(32, inptr);
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if (bytes > 48)
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rgb3 = vec_ld(48, inptr);
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#if RGB_PIXELSIZE == 4
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if (bytes > 64)
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rgb4 = vec_ld(64, inptr);
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#endif
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unaligned_shift_index = vec_lvsl(0, inptr);
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rgb0 = vec_perm(rgb0, rgb1, unaligned_shift_index);
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rgb1 = vec_perm(rgb1, rgb2, unaligned_shift_index);
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rgb2 = vec_perm(rgb2, rgb3, unaligned_shift_index);
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#if RGB_PIXELSIZE == 4
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rgb3 = vec_perm(rgb3, rgb4, unaligned_shift_index);
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#endif
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}
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} else {
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if (num_cols < RGB_PIXELSIZE * 16 && (num_cols & 15)) {
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/* Slow path */
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memcpy(tmpbuf, inptr, min(num_cols, RGB_PIXELSIZE * 16));
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rgb0 = vec_ld(0, tmpbuf);
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rgb1 = vec_ld(16, tmpbuf);
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rgb2 = vec_ld(32, tmpbuf);
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#if RGB_PIXELSIZE == 4
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rgb3 = vec_ld(48, tmpbuf);
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#endif
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} else {
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/* Fast path */
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rgb0 = vec_ld(0, inptr);
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if (num_cols > 16)
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rgb1 = vec_ld(16, inptr);
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if (num_cols > 32)
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rgb2 = vec_ld(32, inptr);
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#if RGB_PIXELSIZE == 4
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if (num_cols > 48)
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rgb3 = vec_ld(48, inptr);
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#endif
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}
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}
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#else
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/* Little endian */
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rgb0 = vec_vsx_ld(0, inptr);
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if (num_cols > 16)
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rgb1 = vec_vsx_ld(16, inptr);
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if (num_cols > 32)
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rgb2 = vec_vsx_ld(32, inptr);
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#if RGB_PIXELSIZE == 4
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if (num_cols > 48)
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rgb3 = vec_vsx_ld(48, inptr);
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#endif
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#endif
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#if RGB_PIXELSIZE == 3
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/* rgb0 = R0 G0 B0 R1 G1 B1 R2 G2 B2 R3 G3 B3 R4 G4 B4 R5
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* rgb1 = G5 B5 R6 G6 B6 R7 G7 B7 R8 G8 B8 R9 G9 B9 Ra Ga
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* rgb2 = Ba Rb Gb Bb Rc Gc Bc Rd Gd Bd Re Ge Be Rf Gf Bf
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*
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* rgbg0 = R0 G0 R1 G1 R2 G2 R3 G3 B0 G0 B1 G1 B2 G2 B3 G3
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* rgbg1 = R4 G4 R5 G5 R6 G6 R7 G7 B4 G4 B5 G5 B6 G6 B7 G7
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* rgbg2 = R8 G8 R9 G9 Ra Ga Rb Gb B8 G8 B9 G9 Ba Ga Bb Gb
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* rgbg3 = Rc Gc Rd Gd Re Ge Rf Gf Bc Gc Bd Gd Be Ge Bf Gf
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*/
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rgbg0 = vec_perm(rgb0, rgb0, (__vector unsigned char)RGBG_INDEX0);
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rgbg1 = vec_perm(rgb0, rgb1, (__vector unsigned char)RGBG_INDEX1);
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rgbg2 = vec_perm(rgb1, rgb2, (__vector unsigned char)RGBG_INDEX2);
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rgbg3 = vec_perm(rgb2, rgb2, (__vector unsigned char)RGBG_INDEX3);
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#else
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/* rgb0 = R0 G0 B0 X0 R1 G1 B1 X1 R2 G2 B2 X2 R3 G3 B3 X3
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* rgb1 = R4 G4 B4 X4 R5 G5 B5 X5 R6 G6 B6 X6 R7 G7 B7 X7
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* rgb2 = R8 G8 B8 X8 R9 G9 B9 X9 Ra Ga Ba Xa Rb Gb Bb Xb
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* rgb3 = Rc Gc Bc Xc Rd Gd Bd Xd Re Ge Be Xe Rf Gf Bf Xf
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*
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* rgbg0 = R0 G0 R1 G1 R2 G2 R3 G3 B0 G0 B1 G1 B2 G2 B3 G3
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* rgbg1 = R4 G4 R5 G5 R6 G6 R7 G7 B4 G4 B5 G5 B6 G6 B7 G7
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* rgbg2 = R8 G8 R9 G9 Ra Ga Rb Gb B8 G8 B9 G9 Ba Ga Bb Gb
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* rgbg3 = Rc Gc Rd Gd Re Ge Rf Gf Bc Gc Bd Gd Be Ge Bf Gf
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*/
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rgbg0 = vec_perm(rgb0, rgb0, (__vector unsigned char)RGBG_INDEX);
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rgbg1 = vec_perm(rgb1, rgb1, (__vector unsigned char)RGBG_INDEX);
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rgbg2 = vec_perm(rgb2, rgb2, (__vector unsigned char)RGBG_INDEX);
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rgbg3 = vec_perm(rgb3, rgb3, (__vector unsigned char)RGBG_INDEX);
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#endif
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/* rg0 = R0 G0 R1 G1 R2 G2 R3 G3
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* bg0 = B0 G0 B1 G1 B2 G2 B3 G3
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* ...
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*
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* NOTE: We have to use vec_merge*() here because vec_unpack*() doesn't
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* support unsigned vectors.
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*/
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rg0 = (__vector signed short)VEC_UNPACKHU(rgbg0);
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bg0 = (__vector signed short)VEC_UNPACKLU(rgbg0);
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rg1 = (__vector signed short)VEC_UNPACKHU(rgbg1);
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bg1 = (__vector signed short)VEC_UNPACKLU(rgbg1);
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rg2 = (__vector signed short)VEC_UNPACKHU(rgbg2);
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bg2 = (__vector signed short)VEC_UNPACKLU(rgbg2);
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rg3 = (__vector signed short)VEC_UNPACKHU(rgbg3);
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bg3 = (__vector signed short)VEC_UNPACKLU(rgbg3);
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/* (Original)
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* Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
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*
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* (This implementation)
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* Y = 0.29900 * R + 0.33700 * G + 0.11400 * B + 0.25000 * G
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*/
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/* Calculate Y values */
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y0 = vec_msums(rg0, pw_f0299_f0337, pd_onehalf);
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y1 = vec_msums(rg1, pw_f0299_f0337, pd_onehalf);
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y2 = vec_msums(rg2, pw_f0299_f0337, pd_onehalf);
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y3 = vec_msums(rg3, pw_f0299_f0337, pd_onehalf);
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y0 = vec_msums(bg0, pw_f0114_f0250, y0);
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y1 = vec_msums(bg1, pw_f0114_f0250, y1);
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y2 = vec_msums(bg2, pw_f0114_f0250, y2);
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y3 = vec_msums(bg3, pw_f0114_f0250, y3);
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/* Clever way to avoid 4 shifts + 2 packs. This packs the high word from
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* each dword into a new 16-bit vector, which is the equivalent of
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* descaling the 32-bit results (right-shifting by 16 bits) and then
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* packing them.
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*/
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yl = vec_perm((__vector unsigned short)y0, (__vector unsigned short)y1,
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shift_pack_index);
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yh = vec_perm((__vector unsigned short)y2, (__vector unsigned short)y3,
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shift_pack_index);
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y = vec_pack(yl, yh);
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vec_st(y, 0, outptr);
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}
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}
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}
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