1 // Copyright 2017 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 // YUV->RGB conversion functions 11 // 12 // Author: Skal (pascal.massimino (at) gmail.com) 13 14 #include "src/dsp/yuv.h" 15 16 #if defined(WEBP_USE_NEON) 17 18 #include <assert.h> 19 #include <stdlib.h> 20 21 #include "src/dsp/neon.h" 22 23 //----------------------------------------------------------------------------- 24 25 static uint8x8_t ConvertRGBToY_NEON(const uint8x8_t R, 26 const uint8x8_t G, 27 const uint8x8_t B) { 28 const uint16x8_t r = vmovl_u8(R); 29 const uint16x8_t g = vmovl_u8(G); 30 const uint16x8_t b = vmovl_u8(B); 31 const uint16x4_t r_lo = vget_low_u16(r); 32 const uint16x4_t r_hi = vget_high_u16(r); 33 const uint16x4_t g_lo = vget_low_u16(g); 34 const uint16x4_t g_hi = vget_high_u16(g); 35 const uint16x4_t b_lo = vget_low_u16(b); 36 const uint16x4_t b_hi = vget_high_u16(b); 37 const uint32x4_t tmp0_lo = vmull_n_u16( r_lo, 16839u); 38 const uint32x4_t tmp0_hi = vmull_n_u16( r_hi, 16839u); 39 const uint32x4_t tmp1_lo = vmlal_n_u16(tmp0_lo, g_lo, 33059u); 40 const uint32x4_t tmp1_hi = vmlal_n_u16(tmp0_hi, g_hi, 33059u); 41 const uint32x4_t tmp2_lo = vmlal_n_u16(tmp1_lo, b_lo, 6420u); 42 const uint32x4_t tmp2_hi = vmlal_n_u16(tmp1_hi, b_hi, 6420u); 43 const uint16x8_t Y1 = vcombine_u16(vrshrn_n_u32(tmp2_lo, 16), 44 vrshrn_n_u32(tmp2_hi, 16)); 45 const uint16x8_t Y2 = vaddq_u16(Y1, vdupq_n_u16(16)); 46 return vqmovn_u16(Y2); 47 } 48 49 static void ConvertRGB24ToY_NEON(const uint8_t* rgb, uint8_t* y, int width) { 50 int i; 51 for (i = 0; i + 8 <= width; i += 8, rgb += 3 * 8) { 52 const uint8x8x3_t RGB = vld3_u8(rgb); 53 const uint8x8_t Y = ConvertRGBToY_NEON(RGB.val[0], RGB.val[1], RGB.val[2]); 54 vst1_u8(y + i, Y); 55 } 56 for (; i < width; ++i, rgb += 3) { // left-over 57 y[i] = VP8RGBToY(rgb[0], rgb[1], rgb[2], YUV_HALF); 58 } 59 } 60 61 static void ConvertBGR24ToY_NEON(const uint8_t* bgr, uint8_t* y, int width) { 62 int i; 63 for (i = 0; i + 8 <= width; i += 8, bgr += 3 * 8) { 64 const uint8x8x3_t BGR = vld3_u8(bgr); 65 const uint8x8_t Y = ConvertRGBToY_NEON(BGR.val[2], BGR.val[1], BGR.val[0]); 66 vst1_u8(y + i, Y); 67 } 68 for (; i < width; ++i, bgr += 3) { // left-over 69 y[i] = VP8RGBToY(bgr[2], bgr[1], bgr[0], YUV_HALF); 70 } 71 } 72 73 static void ConvertARGBToY_NEON(const uint32_t* argb, uint8_t* y, int width) { 74 int i; 75 for (i = 0; i + 8 <= width; i += 8) { 76 const uint8x8x4_t RGB = vld4_u8((const uint8_t*)&argb[i]); 77 const uint8x8_t Y = ConvertRGBToY_NEON(RGB.val[2], RGB.val[1], RGB.val[0]); 78 vst1_u8(y + i, Y); 79 } 80 for (; i < width; ++i) { // left-over 81 const uint32_t p = argb[i]; 82 y[i] = VP8RGBToY((p >> 16) & 0xff, (p >> 8) & 0xff, (p >> 0) & 0xff, 83 YUV_HALF); 84 } 85 } 86 87 //----------------------------------------------------------------------------- 88 89 // computes: DST_s16 = [(C0 * r + C1 * g + C2 * b) >> 16] + CST 90 #define MULTIPLY_16b_PREAMBLE(r, g, b) \ 91 const int16x4_t r_lo = vreinterpret_s16_u16(vget_low_u16(r)); \ 92 const int16x4_t r_hi = vreinterpret_s16_u16(vget_high_u16(r)); \ 93 const int16x4_t g_lo = vreinterpret_s16_u16(vget_low_u16(g)); \ 94 const int16x4_t g_hi = vreinterpret_s16_u16(vget_high_u16(g)); \ 95 const int16x4_t b_lo = vreinterpret_s16_u16(vget_low_u16(b)); \ 96 const int16x4_t b_hi = vreinterpret_s16_u16(vget_high_u16(b)) 97 98 #define MULTIPLY_16b(C0, C1, C2, CST, DST_s16) do { \ 99 const int32x4_t tmp0_lo = vmull_n_s16( r_lo, C0); \ 100 const int32x4_t tmp0_hi = vmull_n_s16( r_hi, C0); \ 101 const int32x4_t tmp1_lo = vmlal_n_s16(tmp0_lo, g_lo, C1); \ 102 const int32x4_t tmp1_hi = vmlal_n_s16(tmp0_hi, g_hi, C1); \ 103 const int32x4_t tmp2_lo = vmlal_n_s16(tmp1_lo, b_lo, C2); \ 104 const int32x4_t tmp2_hi = vmlal_n_s16(tmp1_hi, b_hi, C2); \ 105 const int16x8_t tmp3 = vcombine_s16(vshrn_n_s32(tmp2_lo, 16), \ 106 vshrn_n_s32(tmp2_hi, 16)); \ 107 DST_s16 = vaddq_s16(tmp3, vdupq_n_s16(CST)); \ 108 } while (0) 109 110 // This needs to be a macro, since (128 << SHIFT) needs to be an immediate. 111 #define CONVERT_RGB_TO_UV(r, g, b, SHIFT, U_DST, V_DST) do { \ 112 MULTIPLY_16b_PREAMBLE(r, g, b); \ 113 MULTIPLY_16b(-9719, -19081, 28800, 128 << SHIFT, U_DST); \ 114 MULTIPLY_16b(28800, -24116, -4684, 128 << SHIFT, V_DST); \ 115 } while (0) 116 117 static void ConvertRGBA32ToUV_NEON(const uint16_t* rgb, 118 uint8_t* u, uint8_t* v, int width) { 119 int i; 120 for (i = 0; i + 8 <= width; i += 8, rgb += 4 * 8) { 121 const uint16x8x4_t RGB = vld4q_u16((const uint16_t*)rgb); 122 int16x8_t U, V; 123 CONVERT_RGB_TO_UV(RGB.val[0], RGB.val[1], RGB.val[2], 2, U, V); 124 vst1_u8(u + i, vqrshrun_n_s16(U, 2)); 125 vst1_u8(v + i, vqrshrun_n_s16(V, 2)); 126 } 127 for (; i < width; i += 1, rgb += 4) { 128 const int r = rgb[0], g = rgb[1], b = rgb[2]; 129 u[i] = VP8RGBToU(r, g, b, YUV_HALF << 2); 130 v[i] = VP8RGBToV(r, g, b, YUV_HALF << 2); 131 } 132 } 133 134 static void ConvertARGBToUV_NEON(const uint32_t* argb, uint8_t* u, uint8_t* v, 135 int src_width, int do_store) { 136 int i; 137 for (i = 0; i + 16 <= src_width; i += 16, u += 8, v += 8) { 138 const uint8x16x4_t RGB = vld4q_u8((const uint8_t*)&argb[i]); 139 const uint16x8_t R = vpaddlq_u8(RGB.val[2]); // pair-wise adds 140 const uint16x8_t G = vpaddlq_u8(RGB.val[1]); 141 const uint16x8_t B = vpaddlq_u8(RGB.val[0]); 142 int16x8_t U_tmp, V_tmp; 143 CONVERT_RGB_TO_UV(R, G, B, 1, U_tmp, V_tmp); 144 { 145 const uint8x8_t U = vqrshrun_n_s16(U_tmp, 1); 146 const uint8x8_t V = vqrshrun_n_s16(V_tmp, 1); 147 if (do_store) { 148 vst1_u8(u, U); 149 vst1_u8(v, V); 150 } else { 151 const uint8x8_t prev_u = vld1_u8(u); 152 const uint8x8_t prev_v = vld1_u8(v); 153 vst1_u8(u, vrhadd_u8(U, prev_u)); 154 vst1_u8(v, vrhadd_u8(V, prev_v)); 155 } 156 } 157 } 158 if (i < src_width) { // left-over 159 WebPConvertARGBToUV_C(argb + i, u, v, src_width - i, do_store); 160 } 161 } 162 163 164 //------------------------------------------------------------------------------ 165 166 extern void WebPInitConvertARGBToYUVNEON(void); 167 168 WEBP_TSAN_IGNORE_FUNCTION void WebPInitConvertARGBToYUVNEON(void) { 169 WebPConvertRGB24ToY = ConvertRGB24ToY_NEON; 170 WebPConvertBGR24ToY = ConvertBGR24ToY_NEON; 171 WebPConvertARGBToY = ConvertARGBToY_NEON; 172 WebPConvertARGBToUV = ConvertARGBToUV_NEON; 173 WebPConvertRGBA32ToUV = ConvertRGBA32ToUV_NEON; 174 } 175 176 //------------------------------------------------------------------------------ 177 178 #define MAX_Y ((1 << 10) - 1) // 10b precision over 16b-arithmetic 179 static uint16_t clip_y_NEON(int v) { 180 return (v < 0) ? 0 : (v > MAX_Y) ? MAX_Y : (uint16_t)v; 181 } 182 183 static uint64_t SharpYUVUpdateY_NEON(const uint16_t* ref, const uint16_t* src, 184 uint16_t* dst, int len) { 185 int i; 186 const int16x8_t zero = vdupq_n_s16(0); 187 const int16x8_t max = vdupq_n_s16(MAX_Y); 188 uint64x2_t sum = vdupq_n_u64(0); 189 uint64_t diff; 190 191 for (i = 0; i + 8 <= len; i += 8) { 192 const int16x8_t A = vreinterpretq_s16_u16(vld1q_u16(ref + i)); 193 const int16x8_t B = vreinterpretq_s16_u16(vld1q_u16(src + i)); 194 const int16x8_t C = vreinterpretq_s16_u16(vld1q_u16(dst + i)); 195 const int16x8_t D = vsubq_s16(A, B); // diff_y 196 const int16x8_t F = vaddq_s16(C, D); // new_y 197 const uint16x8_t H = 198 vreinterpretq_u16_s16(vmaxq_s16(vminq_s16(F, max), zero)); 199 const int16x8_t I = vabsq_s16(D); // abs(diff_y) 200 vst1q_u16(dst + i, H); 201 sum = vpadalq_u32(sum, vpaddlq_u16(vreinterpretq_u16_s16(I))); 202 } 203 diff = vgetq_lane_u64(sum, 0) + vgetq_lane_u64(sum, 1); 204 for (; i < len; ++i) { 205 const int diff_y = ref[i] - src[i]; 206 const int new_y = (int)(dst[i]) + diff_y; 207 dst[i] = clip_y_NEON(new_y); 208 diff += (uint64_t)(abs(diff_y)); 209 } 210 return diff; 211 } 212 213 static void SharpYUVUpdateRGB_NEON(const int16_t* ref, const int16_t* src, 214 int16_t* dst, int len) { 215 int i; 216 for (i = 0; i + 8 <= len; i += 8) { 217 const int16x8_t A = vld1q_s16(ref + i); 218 const int16x8_t B = vld1q_s16(src + i); 219 const int16x8_t C = vld1q_s16(dst + i); 220 const int16x8_t D = vsubq_s16(A, B); // diff_uv 221 const int16x8_t E = vaddq_s16(C, D); // new_uv 222 vst1q_s16(dst + i, E); 223 } 224 for (; i < len; ++i) { 225 const int diff_uv = ref[i] - src[i]; 226 dst[i] += diff_uv; 227 } 228 } 229 230 static void SharpYUVFilterRow_NEON(const int16_t* A, const int16_t* B, int len, 231 const uint16_t* best_y, uint16_t* out) { 232 int i; 233 const int16x8_t max = vdupq_n_s16(MAX_Y); 234 const int16x8_t zero = vdupq_n_s16(0); 235 for (i = 0; i + 8 <= len; i += 8) { 236 const int16x8_t a0 = vld1q_s16(A + i + 0); 237 const int16x8_t a1 = vld1q_s16(A + i + 1); 238 const int16x8_t b0 = vld1q_s16(B + i + 0); 239 const int16x8_t b1 = vld1q_s16(B + i + 1); 240 const int16x8_t a0b1 = vaddq_s16(a0, b1); 241 const int16x8_t a1b0 = vaddq_s16(a1, b0); 242 const int16x8_t a0a1b0b1 = vaddq_s16(a0b1, a1b0); // A0+A1+B0+B1 243 const int16x8_t a0b1_2 = vaddq_s16(a0b1, a0b1); // 2*(A0+B1) 244 const int16x8_t a1b0_2 = vaddq_s16(a1b0, a1b0); // 2*(A1+B0) 245 const int16x8_t c0 = vshrq_n_s16(vaddq_s16(a0b1_2, a0a1b0b1), 3); 246 const int16x8_t c1 = vshrq_n_s16(vaddq_s16(a1b0_2, a0a1b0b1), 3); 247 const int16x8_t d0 = vaddq_s16(c1, a0); 248 const int16x8_t d1 = vaddq_s16(c0, a1); 249 const int16x8_t e0 = vrshrq_n_s16(d0, 1); 250 const int16x8_t e1 = vrshrq_n_s16(d1, 1); 251 const int16x8x2_t f = vzipq_s16(e0, e1); 252 const int16x8_t g0 = vreinterpretq_s16_u16(vld1q_u16(best_y + 2 * i + 0)); 253 const int16x8_t g1 = vreinterpretq_s16_u16(vld1q_u16(best_y + 2 * i + 8)); 254 const int16x8_t h0 = vaddq_s16(g0, f.val[0]); 255 const int16x8_t h1 = vaddq_s16(g1, f.val[1]); 256 const int16x8_t i0 = vmaxq_s16(vminq_s16(h0, max), zero); 257 const int16x8_t i1 = vmaxq_s16(vminq_s16(h1, max), zero); 258 vst1q_u16(out + 2 * i + 0, vreinterpretq_u16_s16(i0)); 259 vst1q_u16(out + 2 * i + 8, vreinterpretq_u16_s16(i1)); 260 } 261 for (; i < len; ++i) { 262 const int a0b1 = A[i + 0] + B[i + 1]; 263 const int a1b0 = A[i + 1] + B[i + 0]; 264 const int a0a1b0b1 = a0b1 + a1b0 + 8; 265 const int v0 = (8 * A[i + 0] + 2 * a1b0 + a0a1b0b1) >> 4; 266 const int v1 = (8 * A[i + 1] + 2 * a0b1 + a0a1b0b1) >> 4; 267 out[2 * i + 0] = clip_y_NEON(best_y[2 * i + 0] + v0); 268 out[2 * i + 1] = clip_y_NEON(best_y[2 * i + 1] + v1); 269 } 270 } 271 #undef MAX_Y 272 273 //------------------------------------------------------------------------------ 274 275 extern void WebPInitSharpYUVNEON(void); 276 277 WEBP_TSAN_IGNORE_FUNCTION void WebPInitSharpYUVNEON(void) { 278 WebPSharpYUVUpdateY = SharpYUVUpdateY_NEON; 279 WebPSharpYUVUpdateRGB = SharpYUVUpdateRGB_NEON; 280 WebPSharpYUVFilterRow = SharpYUVFilterRow_NEON; 281 } 282 283 #else // !WEBP_USE_NEON 284 285 WEBP_DSP_INIT_STUB(WebPInitConvertARGBToYUVNEON) 286 WEBP_DSP_INIT_STUB(WebPInitSharpYUVNEON) 287 288 #endif // WEBP_USE_NEON 289
