--- /dev/null
+/*
+ * AltiVec optimizations for libjpeg-turbo
+ *
+ * Copyright (C) 2015, D. R. Commander.
+ * All rights reserved.
+ * 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.
+ */
+
+/* This file is included by jdcolor-altivec.c */
+
+
+void jsimd_ycc_rgb_convert_altivec (JDIMENSION out_width, JSAMPIMAGE input_buf,
+ JDIMENSION input_row,
+ JSAMPARRAY output_buf, int num_rows)
+{
+ JSAMPROW outptr, inptr0, inptr1, inptr2;
+ int pitch = out_width * RGB_PIXELSIZE, offset, num_cols;
+ unsigned char __attribute__((aligned(16))) tmpbuf[RGB_PIXELSIZE * 16];
+
+ __vector unsigned char rgb0, rgb1, rgb2, rgbx0, rgbx1, rgbx2, rgbx3,
+ y, cb, cr, edgel, edgeh, edges, out0, out1, out2, out3;
+#if RGB_PIXELSIZE == 4
+ __vector unsigned char rgb3, out4;
+#endif
+ __vector short rg0, rg1, rg2, rg3, bx0, bx1, bx2, bx3, yl, yh, cbl, cbh,
+ crl, crh, rl, rh, gl, gh, bl, bh, g0s, g1s, g2s, g3s;
+ __vector int g0, g1, g2, g3;
+
+ /* Constants
+ * NOTE: The >> 1 is to compensate for the fact that vec_madds() returns 17
+ * high-order bits, not 16.
+ */
+ __vector short pw_f0402 = { __8X(F_0_402 >> 1) },
+ pw_mf0228 = { __8X(-F_0_228 >> 1) },
+ pw_mf0344_f0285 = { __4X2(-F_0_344, F_0_285) },
+ pw_one = { __8X(1) },
+ pw_255 = { __8X(255) },
+ pw_cj = { __8X(CENTERJSAMPLE) };
+ __vector int pd_onehalf = { __4X(ONE_HALF) };
+ __vector unsigned char zero = { __16X(0) },
+ shift_pack_index =
+ { 0, 1, 4, 5, 8, 9, 12, 13, 16, 17, 20, 21, 24, 25, 28, 29};
+
+ while (--num_rows >= 0) {
+ inptr0 = input_buf[0][input_row];
+ inptr1 = input_buf[1][input_row];
+ inptr2 = input_buf[2][input_row];
+ input_row++;
+ outptr = *output_buf++;
+
+ for (num_cols = pitch; num_cols > 0;
+ num_cols -= RGB_PIXELSIZE * 16, outptr += RGB_PIXELSIZE * 16,
+ inptr0 += 16, inptr1 += 16, inptr2 += 16) {
+
+ y = vec_ld(0, inptr0);
+ /* NOTE: We have to use vec_merge*() here because vec_unpack*() doesn't
+ * support unsigned vectors.
+ */
+ yl = (__vector signed short)vec_mergeh(zero, y);
+ yh = (__vector signed short)vec_mergel(zero, y);
+
+ cb = vec_ld(0, inptr1);
+ cbl = (__vector signed short)vec_mergeh(zero, cb);
+ cbh = (__vector signed short)vec_mergel(zero, cb);
+ cbl = vec_sub(cbl, pw_cj);
+ cbh = vec_sub(cbh, pw_cj);
+
+ cr = vec_ld(0, inptr2);
+ crl = (__vector signed short)vec_mergeh(zero, cr);
+ crh = (__vector signed short)vec_mergel(zero, cr);
+ crl = vec_sub(crl, pw_cj);
+ crh = vec_sub(crh, pw_cj);
+
+ /* (Original)
+ * R = Y + 1.40200 * Cr
+ * G = Y - 0.34414 * Cb - 0.71414 * Cr
+ * B = Y + 1.77200 * Cb
+ *
+ * (This implementation)
+ * R = Y + 0.40200 * Cr + Cr
+ * G = Y - 0.34414 * Cb + 0.28586 * Cr - Cr
+ * B = Y - 0.22800 * Cb + Cb + Cb
+ */
+ bl = vec_add(cbl, cbl);
+ bh = vec_add(cbh, cbh);
+ bl = vec_madds(bl, pw_mf0228, pw_one);
+ bh = vec_madds(bh, pw_mf0228, pw_one);
+ bl = vec_sra(bl, (__vector unsigned short)pw_one);
+ bh = vec_sra(bh, (__vector unsigned short)pw_one);
+ bl = vec_add(bl, cbl);
+ bh = vec_add(bh, cbh);
+ bl = vec_add(bl, cbl);
+ bh = vec_add(bh, cbh);
+ bl = vec_add(bl, yl);
+ bh = vec_add(bh, yh);
+
+ rl = vec_add(crl, crl);
+ rh = vec_add(crh, crh);
+ rl = vec_madds(rl, pw_f0402, pw_one);
+ rh = vec_madds(rh, pw_f0402, pw_one);
+ rl = vec_sra(rl, (__vector unsigned short)pw_one);
+ rh = vec_sra(rh, (__vector unsigned short)pw_one);
+ rl = vec_add(rl, crl);
+ rh = vec_add(rh, crh);
+ rl = vec_add(rl, yl);
+ rh = vec_add(rh, yh);
+
+ g0s = vec_mergeh(cbl, crl);
+ g1s = vec_mergel(cbl, crl);
+ g0 = vec_msums(g0s, pw_mf0344_f0285, pd_onehalf);
+ g1 = vec_msums(g1s, pw_mf0344_f0285, pd_onehalf);
+ g2s = vec_mergeh(cbh, crh);
+ g3s = vec_mergel(cbh, crh);
+ g2 = vec_msums(g2s, pw_mf0344_f0285, pd_onehalf);
+ g3 = vec_msums(g3s, pw_mf0344_f0285, pd_onehalf);
+ /* Clever way to avoid 4 shifts + 2 packs. This packs the high word from
+ * each dword into a new 16-bit vector, which is the equivalent of
+ * descaling the 32-bit results (right-shifting by 16 bits) and then
+ * packing them.
+ */
+ gl = (__vector short)vec_perm((__vector unsigned short)g0,
+ (__vector unsigned short)g1,
+ shift_pack_index);
+ gh = (__vector short)vec_perm((__vector unsigned short)g2,
+ (__vector unsigned short)g3,
+ shift_pack_index);
+ gl = vec_sub(gl, crl);
+ gh = vec_sub(gh, crh);
+ gl = vec_add(gl, yl);
+ gh = vec_add(gh, yh);
+
+ rg0 = vec_mergeh(rl, gl);
+ bx0 = vec_mergeh(bl, pw_255);
+ rg1 = vec_mergel(rl, gl);
+ bx1 = vec_mergel(bl, pw_255);
+ rg2 = vec_mergeh(rh, gh);
+ bx2 = vec_mergeh(bh, pw_255);
+ rg3 = vec_mergel(rh, gh);
+ bx3 = vec_mergel(bh, pw_255);
+
+ rgbx0 = vec_packsu(rg0, bx0);
+ rgbx1 = vec_packsu(rg1, bx1);
+ rgbx2 = vec_packsu(rg2, bx2);
+ rgbx3 = vec_packsu(rg3, bx3);
+
+#if RGB_PIXELSIZE == 3
+ /* rgbx0 = R0 G0 R1 G1 R2 G2 R3 G3 B0 X0 B1 X1 B2 X2 B3 X3
+ * rgbx1 = R4 G4 R5 G5 R6 G6 R7 G7 B4 X4 B5 X5 B6 X6 B7 X7
+ * rgbx2 = R8 G8 R9 G9 Ra Ga Rb Gb B8 X8 B9 X9 Ba Xa Bb Xb
+ * rgbx3 = Rc Gc Rd Gd Re Ge Rf Gf Bc Xc Bd Xd Be Xe Bf Xf
+ *
+ * rgb0 = R0 G0 B0 R1 G1 B1 R2 G2 B2 R3 G3 B3 R4 G4 B4 R5
+ * rgb1 = G5 B5 R6 G6 B6 R7 G7 B7 R8 G8 B8 R9 G9 B9 Ra Ga
+ * rgb2 = Ba Rb Gb Bb Rc Gc Bc Rd Gd Bd Re Ge Be Rf Gf Bf
+ */
+ rgb0 = vec_perm(rgbx0, rgbx1, (__vector unsigned char)RGB_INDEX0);
+ rgb1 = vec_perm(rgbx1, rgbx2, (__vector unsigned char)RGB_INDEX1);
+ rgb2 = vec_perm(rgbx2, rgbx3, (__vector unsigned char)RGB_INDEX2);
+#else
+ /* rgbx0 = R0 G0 R1 G1 R2 G2 R3 G3 B0 X0 B1 X1 B2 X2 B3 X3
+ * rgbx1 = R4 G4 R5 G5 R6 G6 R7 G7 B4 X4 B5 X5 B6 X6 B7 X7
+ * rgbx2 = R8 G8 R9 G9 Ra Ga Rb Gb B8 X8 B9 X9 Ba Xa Bb Xb
+ * rgbx3 = Rc Gc Rd Gd Re Ge Rf Gf Bc Xc Bd Xd Be Xe Bf Xf
+ *
+ * rgb0 = R0 G0 B0 X0 R1 G1 B1 X1 R2 G2 B2 X2 R3 G3 B3 X3
+ * rgb1 = R4 G4 B4 X4 R5 G5 B5 X5 R6 G6 B6 X6 R7 G7 B7 X7
+ * rgb2 = R8 G8 B8 X8 R9 G9 B9 X9 Ra Ga Ba Xa Rb Gb Bb Xb
+ * rgb3 = Rc Gc Bc Xc Rd Gd Bd Xd Re Ge Be Xe Rf Gf Bf Xf
+ */
+ rgb0 = vec_perm(rgbx0, rgbx0, (__vector unsigned char)RGB_INDEX);
+ rgb1 = vec_perm(rgbx1, rgbx1, (__vector unsigned char)RGB_INDEX);
+ rgb2 = vec_perm(rgbx2, rgbx2, (__vector unsigned char)RGB_INDEX);
+ rgb3 = vec_perm(rgbx3, rgbx3, (__vector unsigned char)RGB_INDEX);
+#endif
+
+ offset = (size_t)outptr & 15;
+ if (offset) {
+ __vector unsigned char unaligned_shift_index;
+ int bytes = num_cols + offset;
+
+ if (bytes < (RGB_PIXELSIZE + 1) * 16 && (bytes & 15)) {
+ /* Slow path to prevent buffer overwrite. Since there is no way to
+ * write a partial AltiVec register, overwrite would occur on the
+ * last chunk of the last image row if the right edge is not on a
+ * 16-byte boundary. It could also occur on other rows if the bytes
+ * per row is low enough. Since we can't determine whether we're on
+ * the last image row, we have to assume every row is the last.
+ */
+ vec_st(rgb0, 0, tmpbuf);
+ vec_st(rgb1, 16, tmpbuf);
+ vec_st(rgb2, 32, tmpbuf);
+#if RGB_PIXELSIZE == 4
+ vec_st(rgb3, 48, tmpbuf);
+#endif
+ memcpy(outptr, tmpbuf, min(num_cols, RGB_PIXELSIZE * 16));
+ } else {
+ /* Fast path */
+ unaligned_shift_index = vec_lvsl(0, outptr);
+ edgel = vec_ld(0, outptr);
+ edgeh = vec_ld(min(num_cols, RGB_PIXELSIZE * 16) + offset, outptr);
+ edges = vec_perm(edgeh, edgel, unaligned_shift_index);
+ unaligned_shift_index = vec_lvsr(0, outptr);
+ out0 = vec_perm(edges, rgb0, unaligned_shift_index);
+ out1 = vec_perm(rgb0, rgb1, unaligned_shift_index);
+ out2 = vec_perm(rgb1, rgb2, unaligned_shift_index);
+#if RGB_PIXELSIZE == 4
+ out3 = vec_perm(rgb2, rgb3, unaligned_shift_index);
+ out4 = vec_perm(rgb3, edges, unaligned_shift_index);
+#else
+ out3 = vec_perm(rgb2, edges, unaligned_shift_index);
+#endif
+ vec_st(out0, 0, outptr);
+ if (bytes > 16)
+ vec_st(out1, 16, outptr);
+ if (bytes > 32)
+ vec_st(out2, 32, outptr);
+ if (bytes > 48)
+ vec_st(out3, 48, outptr);
+#if RGB_PIXELSIZE == 4
+ if (bytes > 64)
+ vec_st(out4, 64, outptr);
+#endif
+ }
+ } else {
+ if (num_cols < RGB_PIXELSIZE * 16 && (num_cols & 15)) {
+ /* Slow path */
+ vec_st(rgb0, 0, tmpbuf);
+ vec_st(rgb1, 16, tmpbuf);
+ vec_st(rgb2, 32, tmpbuf);
+#if RGB_PIXELSIZE == 4
+ vec_st(rgb3, 48, tmpbuf);
+#endif
+ memcpy(outptr, tmpbuf, min(num_cols, RGB_PIXELSIZE * 16));
+ } else {
+ /* Fast path */
+ vec_st(rgb0, 0, outptr);
+ if (num_cols > 16)
+ vec_st(rgb1, 16, outptr);
+ if (num_cols > 32)
+ vec_st(rgb2, 32, outptr);
+#if RGB_PIXELSIZE == 4
+ if (num_cols > 48)
+ vec_st(rgb3, 48, outptr);
+#endif
+ }
+ }
+ }
+ }
+}
--- /dev/null
+/*
+ * AltiVec optimizations for libjpeg-turbo
+ *
+ * Copyright (C) 2015, D. R. Commander.
+ * All rights reserved.
+ * 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.
+ */
+
+/* YCC --> RGB CONVERSION */
+
+#include "jsimd_altivec.h"
+
+
+#define F_0_344 22554 /* FIX(0.34414) */
+#define F_0_714 46802 /* FIX(0.71414) */
+#define F_1_402 91881 /* FIX(1.40200) */
+#define F_1_772 116130 /* FIX(1.77200) */
+#define F_0_402 (F_1_402 - 65536) /* FIX(1.40200) - FIX(1) */
+#define F_0_285 (65536 - F_0_714) /* FIX(1) - FIX(0.71414) */
+#define F_0_228 (131072 - F_1_772) /* FIX(2) - FIX(1.77200) */
+
+#define SCALEBITS 16
+#define ONE_HALF (1 << (SCALEBITS - 1))
+
+#define RGB_INDEX0 {0,1,8,2,3,10,4,5,12,6,7,14,16,17,24,18}
+#define RGB_INDEX1 {3,10,4,5,12,6,7,14,16,17,24,18,19,26,20,21}
+#define RGB_INDEX2 {12,6,7,14,16,17,24,18,19,26,20,21,28,22,23,30}
+#include "jdcolext-altivec.c"
+#undef RGB_PIXELSIZE
+
+#define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
+#define jsimd_ycc_rgb_convert_altivec jsimd_ycc_extrgb_convert_altivec
+#include "jdcolext-altivec.c"
+#undef RGB_PIXELSIZE
+#undef RGB_INDEX0
+#undef RGB_INDEX1
+#undef RGB_INDEX2
+#undef jsimd_ycc_rgb_convert_altivec
+
+#define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
+#define RGB_INDEX {0,1,8,9,2,3,10,11,4,5,12,13,6,7,14,15}
+#define jsimd_ycc_rgb_convert_altivec jsimd_ycc_extrgbx_convert_altivec
+#include "jdcolext-altivec.c"
+#undef RGB_PIXELSIZE
+#undef RGB_INDEX
+#undef jsimd_ycc_rgb_convert_altivec
+
+#define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
+#define RGB_INDEX0 {8,1,0,10,3,2,12,5,4,14,7,6,24,17,16,26}
+#define RGB_INDEX1 {3,2,12,5,4,14,7,6,24,17,16,26,19,18,28,21}
+#define RGB_INDEX2 {4,14,7,6,24,17,16,26,19,18,28,21,20,30,23,22}
+#define jsimd_ycc_rgb_convert_altivec jsimd_ycc_extbgr_convert_altivec
+#include "jdcolext-altivec.c"
+#undef RGB_PIXELSIZE
+#undef RGB_INDEX0
+#undef RGB_INDEX1
+#undef RGB_INDEX2
+#undef jsimd_ycc_rgb_convert_altivec
+
+#define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
+#define RGB_INDEX {8,1,0,9,10,3,2,11,12,5,4,13,14,7,6,15}
+#define jsimd_ycc_rgb_convert_altivec jsimd_ycc_extbgrx_convert_altivec
+#include "jdcolext-altivec.c"
+#undef RGB_PIXELSIZE
+#undef RGB_INDEX
+#undef jsimd_ycc_rgb_convert_altivec
+
+#define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
+#define RGB_INDEX {9,8,1,0,11,10,3,2,13,12,5,4,15,14,7,6}
+#define jsimd_ycc_rgb_convert_altivec jsimd_ycc_extxbgr_convert_altivec
+#include "jdcolext-altivec.c"
+#undef RGB_PIXELSIZE
+#undef RGB_INDEX
+#undef jsimd_ycc_rgb_convert_altivec
+
+#define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
+#define RGB_INDEX {9,0,1,8,11,2,3,10,13,4,5,12,15,6,7,14}
+#define jsimd_ycc_rgb_convert_altivec jsimd_ycc_extxrgb_convert_altivec
+#include "jdcolext-altivec.c"
+#undef RGB_PIXELSIZE
+#undef RGB_INDEX
+#undef jsimd_ycc_rgb_convert_altivec
projects / libjpeg-turbo / commitdiff