DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 1 | /* |
| 2 | * AltiVec optimizations for libjpeg-turbo |
| 3 | * |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 4 | * Copyright (C) 2014-2015, D. R. Commander. |
DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 5 | * Copyright (C) 2014, Jay Foad. |
| 6 | * All rights reserved. |
| 7 | * This software is provided 'as-is', without any express or implied |
| 8 | * warranty. In no event will the authors be held liable for any damages |
| 9 | * arising from the use of this software. |
| 10 | * |
| 11 | * Permission is granted to anyone to use this software for any purpose, |
| 12 | * including commercial applications, and to alter it and redistribute it |
| 13 | * freely, subject to the following restrictions: |
| 14 | * |
| 15 | * 1. The origin of this software must not be misrepresented; you must not |
| 16 | * claim that you wrote the original software. If you use this software |
| 17 | * in a product, an acknowledgment in the product documentation would be |
| 18 | * appreciated but is not required. |
| 19 | * 2. Altered source versions must be plainly marked as such, and must not be |
| 20 | * misrepresented as being the original software. |
| 21 | * 3. This notice may not be removed or altered from any source distribution. |
| 22 | */ |
| 23 | |
| 24 | /* This file is included by jccolor-altivec.c */ |
| 25 | |
| 26 | |
| 27 | void jsimd_rgb_ycc_convert_altivec (JDIMENSION img_width, JSAMPARRAY input_buf, |
| 28 | JSAMPIMAGE output_buf, |
| 29 | JDIMENSION output_row, int num_rows) |
| 30 | { |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 31 | JSAMPROW inptr, outptr0, outptr1, outptr2; |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 32 | int pitch = img_width * RGB_PIXELSIZE, num_cols; |
| 33 | #if __BIG_ENDIAN__ |
| 34 | int offset; |
| 35 | #endif |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 36 | unsigned char __attribute__((aligned(16))) tmpbuf[RGB_PIXELSIZE * 16]; |
| 37 | |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 38 | __vector unsigned char rgb0, rgb1 = {0}, rgb2 = {0}, |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 39 | rgbg0, rgbg1, rgbg2, rgbg3, y, cb, cr; |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 40 | #if __BIG_ENDIAN__ || RGB_PIXELSIZE == 4 |
| 41 | __vector unsigned char rgb3 = {0}; |
| 42 | #endif |
| 43 | #if __BIG_ENDIAN__ && RGB_PIXELSIZE == 4 |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 44 | __vector unsigned char rgb4 = {0}; |
DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 45 | #endif |
| 46 | __vector short rg0, rg1, rg2, rg3, bg0, bg1, bg2, bg3; |
DRC | a6a24c2 | 2015-01-13 10:00:12 +0000 | [diff] [blame] | 47 | __vector unsigned short yl, yh, crl, crh, cbl, cbh; |
DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 48 | __vector int y0, y1, y2, y3, cr0, cr1, cr2, cr3, cb0, cb1, cb2, cb3; |
| 49 | |
| 50 | /* Constants */ |
| 51 | __vector short pw_f0299_f0337 = { __4X2(F_0_299, F_0_337) }, |
| 52 | pw_f0114_f0250 = { __4X2(F_0_114, F_0_250) }, |
| 53 | pw_mf016_mf033 = { __4X2(-F_0_168, -F_0_331) }, |
| 54 | pw_mf008_mf041 = { __4X2(-F_0_081, -F_0_418) }; |
| 55 | __vector unsigned short pw_f050_f000 = { __4X2(F_0_500, 0) }; |
| 56 | __vector int pd_onehalf = { __4X(ONE_HALF) }, |
| 57 | pd_onehalfm1_cj = { __4X(ONE_HALF - 1 + (CENTERJSAMPLE << SCALEBITS)) }; |
DRC | a6a24c2 | 2015-01-13 10:00:12 +0000 | [diff] [blame] | 58 | __vector unsigned char pb_zero = { __16X(0) }, |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 59 | #if __BIG_ENDIAN__ |
DRC | 406bb01 | 2015-01-13 11:47:20 +0000 | [diff] [blame] | 60 | shift_pack_index = {0,1,4,5,8,9,12,13,16,17,20,21,24,25,28,29}; |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 61 | #else |
| 62 | shift_pack_index = {2,3,6,7,10,11,14,15,18,19,22,23,26,27,30,31}; |
| 63 | #endif |
DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 64 | |
| 65 | while (--num_rows >= 0) { |
| 66 | inptr = *input_buf++; |
| 67 | outptr0 = output_buf[0][output_row]; |
| 68 | outptr1 = output_buf[1][output_row]; |
| 69 | outptr2 = output_buf[2][output_row]; |
| 70 | output_row++; |
| 71 | |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 72 | for (num_cols = pitch; num_cols > 0; |
| 73 | num_cols -= RGB_PIXELSIZE * 16, inptr += RGB_PIXELSIZE * 16, |
DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 74 | outptr0 += 16, outptr1 += 16, outptr2 += 16) { |
| 75 | |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 76 | #if __BIG_ENDIAN__ |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 77 | /* Load 16 pixels == 48 or 64 bytes */ |
| 78 | offset = (size_t)inptr & 15; |
| 79 | if (offset) { |
DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 80 | __vector unsigned char unaligned_shift_index; |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 81 | int bytes = num_cols + offset; |
| 82 | |
DRC | a500575 | 2015-01-10 12:09:11 +0000 | [diff] [blame] | 83 | if (bytes < (RGB_PIXELSIZE + 1) * 16 && (bytes & 15)) { |
| 84 | /* Slow path to prevent buffer overread. Since there is no way to |
| 85 | * read a partial AltiVec register, overread would occur on the last |
| 86 | * chunk of the last image row if the right edge is not on a 16-byte |
DRC | af69295 | 2015-01-10 12:25:42 +0000 | [diff] [blame] | 87 | * boundary. It could also occur on other rows if the bytes per row |
| 88 | * is low enough. Since we can't determine whether we're on the last |
| 89 | * image row, we have to assume every row is the last. |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 90 | */ |
DRC | a500575 | 2015-01-10 12:09:11 +0000 | [diff] [blame] | 91 | memcpy(tmpbuf, inptr, min(num_cols, RGB_PIXELSIZE * 16)); |
| 92 | rgb0 = vec_ld(0, tmpbuf); |
| 93 | rgb1 = vec_ld(16, tmpbuf); |
| 94 | rgb2 = vec_ld(32, tmpbuf); |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 95 | #if RGB_PIXELSIZE == 4 |
DRC | a500575 | 2015-01-10 12:09:11 +0000 | [diff] [blame] | 96 | rgb3 = vec_ld(48, tmpbuf); |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 97 | #endif |
| 98 | } else { |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 99 | /* Fast path */ |
| 100 | rgb0 = vec_ld(0, inptr); |
DRC | a500575 | 2015-01-10 12:09:11 +0000 | [diff] [blame] | 101 | if (bytes > 16) |
| 102 | rgb1 = vec_ld(16, inptr); |
| 103 | if (bytes > 32) |
| 104 | rgb2 = vec_ld(32, inptr); |
| 105 | if (bytes > 48) |
| 106 | rgb3 = vec_ld(48, inptr); |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 107 | #if RGB_PIXELSIZE == 4 |
DRC | a500575 | 2015-01-10 12:09:11 +0000 | [diff] [blame] | 108 | if (bytes > 64) |
| 109 | rgb4 = vec_ld(64, inptr); |
| 110 | #endif |
| 111 | unaligned_shift_index = vec_lvsl(0, inptr); |
| 112 | rgb0 = vec_perm(rgb0, rgb1, unaligned_shift_index); |
| 113 | rgb1 = vec_perm(rgb1, rgb2, unaligned_shift_index); |
| 114 | rgb2 = vec_perm(rgb2, rgb3, unaligned_shift_index); |
| 115 | #if RGB_PIXELSIZE == 4 |
| 116 | rgb3 = vec_perm(rgb3, rgb4, unaligned_shift_index); |
| 117 | #endif |
| 118 | } |
| 119 | } else { |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 120 | #endif /* __BIG_ENDIAN__ */ |
DRC | a500575 | 2015-01-10 12:09:11 +0000 | [diff] [blame] | 121 | if (num_cols < RGB_PIXELSIZE * 16 && (num_cols & 15)) { |
| 122 | /* Slow path */ |
| 123 | memcpy(tmpbuf, inptr, min(num_cols, RGB_PIXELSIZE * 16)); |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 124 | rgb0 = VEC_LD(0, tmpbuf); |
| 125 | rgb1 = VEC_LD(16, tmpbuf); |
| 126 | rgb2 = VEC_LD(32, tmpbuf); |
DRC | a500575 | 2015-01-10 12:09:11 +0000 | [diff] [blame] | 127 | #if RGB_PIXELSIZE == 4 |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 128 | rgb3 = VEC_LD(48, tmpbuf); |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 129 | #endif |
| 130 | } else { |
DRC | a500575 | 2015-01-10 12:09:11 +0000 | [diff] [blame] | 131 | /* Fast path */ |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 132 | rgb0 = VEC_LD(0, inptr); |
DRC | a500575 | 2015-01-10 12:09:11 +0000 | [diff] [blame] | 133 | if (num_cols > 16) |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 134 | rgb1 = VEC_LD(16, inptr); |
DRC | a500575 | 2015-01-10 12:09:11 +0000 | [diff] [blame] | 135 | if (num_cols > 32) |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 136 | rgb2 = VEC_LD(32, inptr); |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 137 | #if RGB_PIXELSIZE == 4 |
DRC | a500575 | 2015-01-10 12:09:11 +0000 | [diff] [blame] | 138 | if (num_cols > 48) |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 139 | rgb3 = VEC_LD(48, inptr); |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 140 | #endif |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 141 | } |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 142 | #if __BIG_ENDIAN__ |
DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 143 | } |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 144 | #endif |
DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 145 | |
DRC | 2534788 | 2015-01-10 11:32:36 +0000 | [diff] [blame] | 146 | #if RGB_PIXELSIZE == 3 |
DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 147 | /* rgb0 = R0 G0 B0 R1 G1 B1 R2 G2 B2 R3 G3 B3 R4 G4 B4 R5 |
| 148 | * rgb1 = G5 B5 R6 G6 B6 R7 G7 B7 R8 G8 B8 R9 G9 B9 Ra Ga |
| 149 | * rgb2 = Ba Rb Gb Bb Rc Gc Bc Rd Gd Bd Re Ge Be Rf Gf Bf |
| 150 | * |
| 151 | * rgbg0 = R0 G0 R1 G1 R2 G2 R3 G3 B0 G0 B1 G1 B2 G2 B3 G3 |
| 152 | * rgbg1 = R4 G4 R5 G5 R6 G6 R7 G7 B4 G4 B5 G5 B6 G6 B7 G7 |
| 153 | * rgbg2 = R8 G8 R9 G9 Ra Ga Rb Gb B8 G8 B9 G9 Ba Ga Bb Gb |
| 154 | * rgbg3 = Rc Gc Rd Gd Re Ge Rf Gf Bc Gc Bd Gd Be Ge Bf Gf |
| 155 | */ |
| 156 | rgbg0 = vec_perm(rgb0, rgb0, (__vector unsigned char)RGBG_INDEX0); |
| 157 | rgbg1 = vec_perm(rgb0, rgb1, (__vector unsigned char)RGBG_INDEX1); |
| 158 | rgbg2 = vec_perm(rgb1, rgb2, (__vector unsigned char)RGBG_INDEX2); |
| 159 | rgbg3 = vec_perm(rgb2, rgb2, (__vector unsigned char)RGBG_INDEX3); |
| 160 | #else |
DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 161 | /* rgb0 = R0 G0 B0 X0 R1 G1 B1 X1 R2 G2 B2 X2 R3 G3 B3 X3 |
DRC | 8de75d0 | 2015-01-08 10:42:54 +0000 | [diff] [blame] | 162 | * rgb1 = R4 G4 B4 X4 R5 G5 B5 X5 R6 G6 B6 X6 R7 G7 B7 X7 |
| 163 | * rgb2 = R8 G8 B8 X8 R9 G9 B9 X9 Ra Ga Ba Xa Rb Gb Bb Xb |
| 164 | * rgb3 = Rc Gc Bc Xc Rd Gd Bd Xd Re Ge Be Xe Rf Gf Bf Xf |
DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 165 | * |
| 166 | * rgbg0 = R0 G0 R1 G1 R2 G2 R3 G3 B0 G0 B1 G1 B2 G2 B3 G3 |
| 167 | * rgbg1 = R4 G4 R5 G5 R6 G6 R7 G7 B4 G4 B5 G5 B6 G6 B7 G7 |
| 168 | * rgbg2 = R8 G8 R9 G9 Ra Ga Rb Gb B8 G8 B9 G9 Ba Ga Bb Gb |
| 169 | * rgbg3 = Rc Gc Rd Gd Re Ge Rf Gf Bc Gc Bd Gd Be Ge Bf Gf |
| 170 | */ |
| 171 | rgbg0 = vec_perm(rgb0, rgb0, (__vector unsigned char)RGBG_INDEX); |
| 172 | rgbg1 = vec_perm(rgb1, rgb1, (__vector unsigned char)RGBG_INDEX); |
| 173 | rgbg2 = vec_perm(rgb2, rgb2, (__vector unsigned char)RGBG_INDEX); |
| 174 | rgbg3 = vec_perm(rgb3, rgb3, (__vector unsigned char)RGBG_INDEX); |
| 175 | #endif |
| 176 | |
| 177 | /* rg0 = R0 G0 R1 G1 R2 G2 R3 G3 |
| 178 | * bg0 = B0 G0 B1 G1 B2 G2 B3 G3 |
| 179 | * ... |
| 180 | * |
| 181 | * NOTE: We have to use vec_merge*() here because vec_unpack*() doesn't |
| 182 | * support unsigned vectors. |
| 183 | */ |
DRC | 771ab19 | 2015-02-20 19:57:21 +0000 | [diff] [blame] | 184 | rg0 = (__vector signed short)VEC_UNPACKHU(rgbg0); |
| 185 | bg0 = (__vector signed short)VEC_UNPACKLU(rgbg0); |
| 186 | rg1 = (__vector signed short)VEC_UNPACKHU(rgbg1); |
| 187 | bg1 = (__vector signed short)VEC_UNPACKLU(rgbg1); |
| 188 | rg2 = (__vector signed short)VEC_UNPACKHU(rgbg2); |
| 189 | bg2 = (__vector signed short)VEC_UNPACKLU(rgbg2); |
| 190 | rg3 = (__vector signed short)VEC_UNPACKHU(rgbg3); |
| 191 | bg3 = (__vector signed short)VEC_UNPACKLU(rgbg3); |
DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 192 | |
| 193 | /* (Original) |
| 194 | * Y = 0.29900 * R + 0.58700 * G + 0.11400 * B |
| 195 | * Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B + CENTERJSAMPLE |
| 196 | * Cr = 0.50000 * R - 0.41869 * G - 0.08131 * B + CENTERJSAMPLE |
| 197 | * |
| 198 | * (This implementation) |
| 199 | * Y = 0.29900 * R + 0.33700 * G + 0.11400 * B + 0.25000 * G |
| 200 | * Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B + CENTERJSAMPLE |
| 201 | * Cr = 0.50000 * R - 0.41869 * G - 0.08131 * B + CENTERJSAMPLE |
| 202 | */ |
| 203 | |
| 204 | /* Calculate Y values */ |
| 205 | |
| 206 | y0 = vec_msums(rg0, pw_f0299_f0337, pd_onehalf); |
| 207 | y1 = vec_msums(rg1, pw_f0299_f0337, pd_onehalf); |
| 208 | y2 = vec_msums(rg2, pw_f0299_f0337, pd_onehalf); |
| 209 | y3 = vec_msums(rg3, pw_f0299_f0337, pd_onehalf); |
| 210 | y0 = vec_msums(bg0, pw_f0114_f0250, y0); |
| 211 | y1 = vec_msums(bg1, pw_f0114_f0250, y1); |
| 212 | y2 = vec_msums(bg2, pw_f0114_f0250, y2); |
| 213 | y3 = vec_msums(bg3, pw_f0114_f0250, y3); |
| 214 | /* Clever way to avoid 4 shifts + 2 packs. This packs the high word from |
| 215 | * each dword into a new 16-bit vector, which is the equivalent of |
| 216 | * descaling the 32-bit results (right-shifting by 16 bits) and then |
| 217 | * packing them. |
| 218 | */ |
DRC | a6a24c2 | 2015-01-13 10:00:12 +0000 | [diff] [blame] | 219 | yl = vec_perm((__vector unsigned short)y0, (__vector unsigned short)y1, |
| 220 | shift_pack_index); |
| 221 | yh = vec_perm((__vector unsigned short)y2, (__vector unsigned short)y3, |
| 222 | shift_pack_index); |
| 223 | y = vec_pack(yl, yh); |
DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 224 | vec_st(y, 0, outptr0); |
| 225 | |
| 226 | /* Calculate Cb values */ |
| 227 | cb0 = vec_msums(rg0, pw_mf016_mf033, pd_onehalfm1_cj); |
| 228 | cb1 = vec_msums(rg1, pw_mf016_mf033, pd_onehalfm1_cj); |
| 229 | cb2 = vec_msums(rg2, pw_mf016_mf033, pd_onehalfm1_cj); |
| 230 | cb3 = vec_msums(rg3, pw_mf016_mf033, pd_onehalfm1_cj); |
| 231 | cb0 = (__vector int)vec_msum((__vector unsigned short)bg0, pw_f050_f000, |
| 232 | (__vector unsigned int)cb0); |
| 233 | cb1 = (__vector int)vec_msum((__vector unsigned short)bg1, pw_f050_f000, |
| 234 | (__vector unsigned int)cb1); |
| 235 | cb2 = (__vector int)vec_msum((__vector unsigned short)bg2, pw_f050_f000, |
| 236 | (__vector unsigned int)cb2); |
| 237 | cb3 = (__vector int)vec_msum((__vector unsigned short)bg3, pw_f050_f000, |
| 238 | (__vector unsigned int)cb3); |
DRC | a6a24c2 | 2015-01-13 10:00:12 +0000 | [diff] [blame] | 239 | cbl = vec_perm((__vector unsigned short)cb0, |
| 240 | (__vector unsigned short)cb1, shift_pack_index); |
| 241 | cbh = vec_perm((__vector unsigned short)cb2, |
| 242 | (__vector unsigned short)cb3, shift_pack_index); |
| 243 | cb = vec_pack(cbl, cbh); |
DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 244 | vec_st(cb, 0, outptr1); |
| 245 | |
| 246 | /* Calculate Cr values */ |
| 247 | cr0 = vec_msums(bg0, pw_mf008_mf041, pd_onehalfm1_cj); |
| 248 | cr1 = vec_msums(bg1, pw_mf008_mf041, pd_onehalfm1_cj); |
| 249 | cr2 = vec_msums(bg2, pw_mf008_mf041, pd_onehalfm1_cj); |
| 250 | cr3 = vec_msums(bg3, pw_mf008_mf041, pd_onehalfm1_cj); |
| 251 | cr0 = (__vector int)vec_msum((__vector unsigned short)rg0, pw_f050_f000, |
| 252 | (__vector unsigned int)cr0); |
| 253 | cr1 = (__vector int)vec_msum((__vector unsigned short)rg1, pw_f050_f000, |
| 254 | (__vector unsigned int)cr1); |
| 255 | cr2 = (__vector int)vec_msum((__vector unsigned short)rg2, pw_f050_f000, |
| 256 | (__vector unsigned int)cr2); |
| 257 | cr3 = (__vector int)vec_msum((__vector unsigned short)rg3, pw_f050_f000, |
| 258 | (__vector unsigned int)cr3); |
DRC | a6a24c2 | 2015-01-13 10:00:12 +0000 | [diff] [blame] | 259 | crl = vec_perm((__vector unsigned short)cr0, |
| 260 | (__vector unsigned short)cr1, shift_pack_index); |
| 261 | crh = vec_perm((__vector unsigned short)cr2, |
| 262 | (__vector unsigned short)cr3, shift_pack_index); |
| 263 | cr = vec_pack(crl, crh); |
DRC | 62bae20 | 2014-12-22 13:42:26 +0000 | [diff] [blame] | 264 | vec_st(cr, 0, outptr2); |
| 265 | } |
| 266 | } |
| 267 | } |