upsampling_neon.c revision 5f1c94371a64b3196d4be9466099bb892df9b88e
1// Copyright 2011 Google Inc. All Rights Reserved. 2// 3// Use of this source code is governed by a BSD-style license 4// that can be found in the COPYING file in the root of the source 5// tree. An additional intellectual property rights grant can be found 6// in the file PATENTS. All contributing project authors may 7// be found in the AUTHORS file in the root of the source tree. 8// ----------------------------------------------------------------------------- 9// 10// NEON version of YUV to RGB upsampling functions. 11// 12// Author: mans@mansr.com (Mans Rullgard) 13// Based on SSE code by: somnath@google.com (Somnath Banerjee) 14 15#include "./dsp.h" 16 17#if defined(WEBP_USE_NEON) 18 19#include <assert.h> 20#include <arm_neon.h> 21#include <string.h> 22#include "./neon.h" 23#include "./yuv.h" 24 25#ifdef FANCY_UPSAMPLING 26 27//----------------------------------------------------------------------------- 28// U/V upsampling 29 30// Loads 9 pixels each from rows r1 and r2 and generates 16 pixels. 31#define UPSAMPLE_16PIXELS(r1, r2, out) { \ 32 uint8x8_t a = vld1_u8(r1); \ 33 uint8x8_t b = vld1_u8(r1 + 1); \ 34 uint8x8_t c = vld1_u8(r2); \ 35 uint8x8_t d = vld1_u8(r2 + 1); \ 36 \ 37 uint16x8_t al = vshll_n_u8(a, 1); \ 38 uint16x8_t bl = vshll_n_u8(b, 1); \ 39 uint16x8_t cl = vshll_n_u8(c, 1); \ 40 uint16x8_t dl = vshll_n_u8(d, 1); \ 41 \ 42 uint8x8_t diag1, diag2; \ 43 uint16x8_t sl; \ 44 \ 45 /* a + b + c + d */ \ 46 sl = vaddl_u8(a, b); \ 47 sl = vaddw_u8(sl, c); \ 48 sl = vaddw_u8(sl, d); \ 49 \ 50 al = vaddq_u16(sl, al); /* 3a + b + c + d */ \ 51 bl = vaddq_u16(sl, bl); /* a + 3b + c + d */ \ 52 \ 53 al = vaddq_u16(al, dl); /* 3a + b + c + 3d */ \ 54 bl = vaddq_u16(bl, cl); /* a + 3b + 3c + d */ \ 55 \ 56 diag2 = vshrn_n_u16(al, 3); \ 57 diag1 = vshrn_n_u16(bl, 3); \ 58 \ 59 a = vrhadd_u8(a, diag1); \ 60 b = vrhadd_u8(b, diag2); \ 61 c = vrhadd_u8(c, diag2); \ 62 d = vrhadd_u8(d, diag1); \ 63 \ 64 { \ 65 uint8x8x2_t a_b, c_d; \ 66 INIT_VECTOR2(a_b, a, b); \ 67 INIT_VECTOR2(c_d, c, d); \ 68 vst2_u8(out, a_b); \ 69 vst2_u8(out + 32, c_d); \ 70 } \ 71} 72 73// Turn the macro into a function for reducing code-size when non-critical 74static void Upsample16Pixels(const uint8_t *r1, const uint8_t *r2, 75 uint8_t *out) { 76 UPSAMPLE_16PIXELS(r1, r2, out); 77} 78 79#define UPSAMPLE_LAST_BLOCK(tb, bb, num_pixels, out) { \ 80 uint8_t r1[9], r2[9]; \ 81 memcpy(r1, (tb), (num_pixels)); \ 82 memcpy(r2, (bb), (num_pixels)); \ 83 /* replicate last byte */ \ 84 memset(r1 + (num_pixels), r1[(num_pixels) - 1], 9 - (num_pixels)); \ 85 memset(r2 + (num_pixels), r2[(num_pixels) - 1], 9 - (num_pixels)); \ 86 Upsample16Pixels(r1, r2, out); \ 87} 88 89//----------------------------------------------------------------------------- 90// YUV->RGB conversion 91 92static const int16_t kCoeffs[4] = { kYScale, kVToR, kUToG, kVToG }; 93 94#define v255 vdup_n_u8(255) 95 96#define STORE_Rgb(out, r, g, b) do { \ 97 uint8x8x3_t r_g_b; \ 98 INIT_VECTOR3(r_g_b, r, g, b); \ 99 vst3_u8(out, r_g_b); \ 100} while (0) 101 102#define STORE_Bgr(out, r, g, b) do { \ 103 uint8x8x3_t b_g_r; \ 104 INIT_VECTOR3(b_g_r, b, g, r); \ 105 vst3_u8(out, b_g_r); \ 106} while (0) 107 108#define STORE_Rgba(out, r, g, b) do { \ 109 uint8x8x4_t r_g_b_v255; \ 110 INIT_VECTOR4(r_g_b_v255, r, g, b, v255); \ 111 vst4_u8(out, r_g_b_v255); \ 112} while (0) 113 114#define STORE_Bgra(out, r, g, b) do { \ 115 uint8x8x4_t b_g_r_v255; \ 116 INIT_VECTOR4(b_g_r_v255, b, g, r, v255); \ 117 vst4_u8(out, b_g_r_v255); \ 118} while (0) 119 120#define CONVERT8(FMT, XSTEP, N, src_y, src_uv, out, cur_x) { \ 121 int i; \ 122 for (i = 0; i < N; i += 8) { \ 123 const int off = ((cur_x) + i) * XSTEP; \ 124 uint8x8_t y = vld1_u8((src_y) + (cur_x) + i); \ 125 uint8x8_t u = vld1_u8((src_uv) + i); \ 126 uint8x8_t v = vld1_u8((src_uv) + i + 16); \ 127 const int16x8_t yy = vreinterpretq_s16_u16(vsubl_u8(y, u16)); \ 128 const int16x8_t uu = vreinterpretq_s16_u16(vsubl_u8(u, u128)); \ 129 const int16x8_t vv = vreinterpretq_s16_u16(vsubl_u8(v, u128)); \ 130 int32x4_t yl = vmull_lane_s16(vget_low_s16(yy), cf16, 0); \ 131 int32x4_t yh = vmull_lane_s16(vget_high_s16(yy), cf16, 0); \ 132 const int32x4_t rl = vmlal_lane_s16(yl, vget_low_s16(vv), cf16, 1);\ 133 const int32x4_t rh = vmlal_lane_s16(yh, vget_high_s16(vv), cf16, 1);\ 134 int32x4_t gl = vmlsl_lane_s16(yl, vget_low_s16(uu), cf16, 2); \ 135 int32x4_t gh = vmlsl_lane_s16(yh, vget_high_s16(uu), cf16, 2); \ 136 const int32x4_t bl = vmovl_s16(vget_low_s16(uu)); \ 137 const int32x4_t bh = vmovl_s16(vget_high_s16(uu)); \ 138 gl = vmlsl_lane_s16(gl, vget_low_s16(vv), cf16, 3); \ 139 gh = vmlsl_lane_s16(gh, vget_high_s16(vv), cf16, 3); \ 140 yl = vmlaq_lane_s32(yl, bl, cf32, 0); \ 141 yh = vmlaq_lane_s32(yh, bh, cf32, 0); \ 142 /* vrshrn_n_s32() already incorporates the rounding constant */ \ 143 y = vqmovun_s16(vcombine_s16(vrshrn_n_s32(rl, YUV_FIX2), \ 144 vrshrn_n_s32(rh, YUV_FIX2))); \ 145 u = vqmovun_s16(vcombine_s16(vrshrn_n_s32(gl, YUV_FIX2), \ 146 vrshrn_n_s32(gh, YUV_FIX2))); \ 147 v = vqmovun_s16(vcombine_s16(vrshrn_n_s32(yl, YUV_FIX2), \ 148 vrshrn_n_s32(yh, YUV_FIX2))); \ 149 STORE_ ## FMT(out + off, y, u, v); \ 150 } \ 151} 152 153#define CONVERT1(FUNC, XSTEP, N, src_y, src_uv, rgb, cur_x) { \ 154 int i; \ 155 for (i = 0; i < N; i++) { \ 156 const int off = ((cur_x) + i) * XSTEP; \ 157 const int y = src_y[(cur_x) + i]; \ 158 const int u = (src_uv)[i]; \ 159 const int v = (src_uv)[i + 16]; \ 160 FUNC(y, u, v, rgb + off); \ 161 } \ 162} 163 164#define CONVERT2RGB_8(FMT, XSTEP, top_y, bottom_y, uv, \ 165 top_dst, bottom_dst, cur_x, len) { \ 166 CONVERT8(FMT, XSTEP, len, top_y, uv, top_dst, cur_x) \ 167 if (bottom_y != NULL) { \ 168 CONVERT8(FMT, XSTEP, len, bottom_y, (uv) + 32, bottom_dst, cur_x) \ 169 } \ 170} 171 172#define CONVERT2RGB_1(FUNC, XSTEP, top_y, bottom_y, uv, \ 173 top_dst, bottom_dst, cur_x, len) { \ 174 CONVERT1(FUNC, XSTEP, len, top_y, uv, top_dst, cur_x); \ 175 if (bottom_y != NULL) { \ 176 CONVERT1(FUNC, XSTEP, len, bottom_y, (uv) + 32, bottom_dst, cur_x); \ 177 } \ 178} 179 180#define NEON_UPSAMPLE_FUNC(FUNC_NAME, FMT, XSTEP) \ 181static void FUNC_NAME(const uint8_t *top_y, const uint8_t *bottom_y, \ 182 const uint8_t *top_u, const uint8_t *top_v, \ 183 const uint8_t *cur_u, const uint8_t *cur_v, \ 184 uint8_t *top_dst, uint8_t *bottom_dst, int len) { \ 185 int block; \ 186 /* 16 byte aligned array to cache reconstructed u and v */ \ 187 uint8_t uv_buf[2 * 32 + 15]; \ 188 uint8_t *const r_uv = (uint8_t*)((uintptr_t)(uv_buf + 15) & ~15); \ 189 const int uv_len = (len + 1) >> 1; \ 190 /* 9 pixels must be read-able for each block */ \ 191 const int num_blocks = (uv_len - 1) >> 3; \ 192 const int leftover = uv_len - num_blocks * 8; \ 193 const int last_pos = 1 + 16 * num_blocks; \ 194 \ 195 const int u_diag = ((top_u[0] + cur_u[0]) >> 1) + 1; \ 196 const int v_diag = ((top_v[0] + cur_v[0]) >> 1) + 1; \ 197 \ 198 const int16x4_t cf16 = vld1_s16(kCoeffs); \ 199 const int32x2_t cf32 = vdup_n_s32(kUToB); \ 200 const uint8x8_t u16 = vdup_n_u8(16); \ 201 const uint8x8_t u128 = vdup_n_u8(128); \ 202 \ 203 /* Treat the first pixel in regular way */ \ 204 assert(top_y != NULL); \ 205 { \ 206 const int u0 = (top_u[0] + u_diag) >> 1; \ 207 const int v0 = (top_v[0] + v_diag) >> 1; \ 208 VP8YuvTo ## FMT(top_y[0], u0, v0, top_dst); \ 209 } \ 210 if (bottom_y != NULL) { \ 211 const int u0 = (cur_u[0] + u_diag) >> 1; \ 212 const int v0 = (cur_v[0] + v_diag) >> 1; \ 213 VP8YuvTo ## FMT(bottom_y[0], u0, v0, bottom_dst); \ 214 } \ 215 \ 216 for (block = 0; block < num_blocks; ++block) { \ 217 UPSAMPLE_16PIXELS(top_u, cur_u, r_uv); \ 218 UPSAMPLE_16PIXELS(top_v, cur_v, r_uv + 16); \ 219 CONVERT2RGB_8(FMT, XSTEP, top_y, bottom_y, r_uv, \ 220 top_dst, bottom_dst, 16 * block + 1, 16); \ 221 top_u += 8; \ 222 cur_u += 8; \ 223 top_v += 8; \ 224 cur_v += 8; \ 225 } \ 226 \ 227 UPSAMPLE_LAST_BLOCK(top_u, cur_u, leftover, r_uv); \ 228 UPSAMPLE_LAST_BLOCK(top_v, cur_v, leftover, r_uv + 16); \ 229 CONVERT2RGB_1(VP8YuvTo ## FMT, XSTEP, top_y, bottom_y, r_uv, \ 230 top_dst, bottom_dst, last_pos, len - last_pos); \ 231} 232 233// NEON variants of the fancy upsampler. 234NEON_UPSAMPLE_FUNC(UpsampleRgbLinePair, Rgb, 3) 235NEON_UPSAMPLE_FUNC(UpsampleBgrLinePair, Bgr, 3) 236NEON_UPSAMPLE_FUNC(UpsampleRgbaLinePair, Rgba, 4) 237NEON_UPSAMPLE_FUNC(UpsampleBgraLinePair, Bgra, 4) 238 239#endif // FANCY_UPSAMPLING 240 241#endif // WEBP_USE_NEON 242 243//------------------------------------------------------------------------------ 244 245extern void WebPInitUpsamplersNEON(void); 246 247#ifdef FANCY_UPSAMPLING 248 249extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */]; 250 251void WebPInitUpsamplersNEON(void) { 252#if defined(WEBP_USE_NEON) 253 WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair; 254 WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair; 255 WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair; 256 WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair; 257 WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair; 258 WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair; 259#endif // WEBP_USE_NEON 260} 261 262#else 263 264// this empty function is to avoid an empty .o 265void WebPInitUpsamplersNEON(void) {} 266 267#endif // FANCY_UPSAMPLING 268