1 /* 2 * Copyright 2012 The Android Open Source Project 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "SkBlitRow_opts_arm_neon.h" 9 10 #include "SkBlitMask.h" 11 #include "SkBlitRow.h" 12 #include "SkColorPriv.h" 13 #include "SkDither.h" 14 #include "SkMathPriv.h" 15 #include "SkUtils.h" 16 17 #include "SkColor_opts_neon.h" 18 #include <arm_neon.h> 19 20 #ifdef SK_CPU_ARM64 21 static inline uint8x8x4_t sk_vld4_u8_arm64_3(const SkPMColor* SK_RESTRICT & src) { 22 uint8x8x4_t vsrc; 23 uint8x8_t vsrc_0, vsrc_1, vsrc_2; 24 25 asm ( 26 "ld4 {v0.8b - v3.8b}, [%[src]], #32 \t\n" 27 "mov %[vsrc0].8b, v0.8b \t\n" 28 "mov %[vsrc1].8b, v1.8b \t\n" 29 "mov %[vsrc2].8b, v2.8b \t\n" 30 : [vsrc0] "=w" (vsrc_0), [vsrc1] "=w" (vsrc_1), 31 [vsrc2] "=w" (vsrc_2), [src] "+&r" (src) 32 : : "v0", "v1", "v2", "v3" 33 ); 34 35 vsrc.val[0] = vsrc_0; 36 vsrc.val[1] = vsrc_1; 37 vsrc.val[2] = vsrc_2; 38 39 return vsrc; 40 } 41 42 static inline uint8x8x4_t sk_vld4_u8_arm64_4(const SkPMColor* SK_RESTRICT & src) { 43 uint8x8x4_t vsrc; 44 uint8x8_t vsrc_0, vsrc_1, vsrc_2, vsrc_3; 45 46 asm ( 47 "ld4 {v0.8b - v3.8b}, [%[src]], #32 \t\n" 48 "mov %[vsrc0].8b, v0.8b \t\n" 49 "mov %[vsrc1].8b, v1.8b \t\n" 50 "mov %[vsrc2].8b, v2.8b \t\n" 51 "mov %[vsrc3].8b, v3.8b \t\n" 52 : [vsrc0] "=w" (vsrc_0), [vsrc1] "=w" (vsrc_1), 53 [vsrc2] "=w" (vsrc_2), [vsrc3] "=w" (vsrc_3), 54 [src] "+&r" (src) 55 : : "v0", "v1", "v2", "v3" 56 ); 57 58 vsrc.val[0] = vsrc_0; 59 vsrc.val[1] = vsrc_1; 60 vsrc.val[2] = vsrc_2; 61 vsrc.val[3] = vsrc_3; 62 63 return vsrc; 64 } 65 #endif 66 67 void S32_D565_Opaque_neon(uint16_t* SK_RESTRICT dst, 68 const SkPMColor* SK_RESTRICT src, int count, 69 U8CPU alpha, int /*x*/, int /*y*/) { 70 SkASSERT(255 == alpha); 71 72 while (count >= 8) { 73 uint8x8x4_t vsrc; 74 uint16x8_t vdst; 75 76 // Load 77 #ifdef SK_CPU_ARM64 78 vsrc = sk_vld4_u8_arm64_3(src); 79 #else 80 vsrc = vld4_u8((uint8_t*)src); 81 src += 8; 82 #endif 83 84 // Convert src to 565 85 vdst = SkPixel32ToPixel16_neon8(vsrc); 86 87 // Store 88 vst1q_u16(dst, vdst); 89 90 // Prepare next iteration 91 dst += 8; 92 count -= 8; 93 }; 94 95 // Leftovers 96 while (count > 0) { 97 SkPMColor c = *src++; 98 SkPMColorAssert(c); 99 *dst = SkPixel32ToPixel16_ToU16(c); 100 dst++; 101 count--; 102 }; 103 } 104 105 void S32_D565_Blend_neon(uint16_t* SK_RESTRICT dst, 106 const SkPMColor* SK_RESTRICT src, int count, 107 U8CPU alpha, int /*x*/, int /*y*/) { 108 SkASSERT(255 > alpha); 109 110 uint16x8_t vmask_blue, vscale; 111 112 // prepare constants 113 vscale = vdupq_n_u16(SkAlpha255To256(alpha)); 114 vmask_blue = vmovq_n_u16(0x1F); 115 116 while (count >= 8) { 117 uint8x8x4_t vsrc; 118 uint16x8_t vdst, vdst_r, vdst_g, vdst_b; 119 uint16x8_t vres_r, vres_g, vres_b; 120 121 // Load src 122 #ifdef SK_CPU_ARM64 123 vsrc = sk_vld4_u8_arm64_3(src); 124 #else 125 { 126 register uint8x8_t d0 asm("d0"); 127 register uint8x8_t d1 asm("d1"); 128 register uint8x8_t d2 asm("d2"); 129 register uint8x8_t d3 asm("d3"); 130 131 asm ( 132 "vld4.8 {d0-d3},[%[src]]!" 133 : "=w" (d0), "=w" (d1), "=w" (d2), "=w" (d3), [src] "+&r" (src) 134 : 135 ); 136 vsrc.val[0] = d0; 137 vsrc.val[1] = d1; 138 vsrc.val[2] = d2; 139 } 140 #endif 141 142 // Load and unpack dst 143 vdst = vld1q_u16(dst); 144 vdst_g = vshlq_n_u16(vdst, 5); // shift green to top of lanes 145 vdst_b = vandq_u16(vdst, vmask_blue); // extract blue 146 vdst_r = vshrq_n_u16(vdst, 6+5); // extract red 147 vdst_g = vshrq_n_u16(vdst_g, 5+5); // extract green 148 149 // Shift src to 565 range 150 vsrc.val[NEON_R] = vshr_n_u8(vsrc.val[NEON_R], 3); 151 vsrc.val[NEON_G] = vshr_n_u8(vsrc.val[NEON_G], 2); 152 vsrc.val[NEON_B] = vshr_n_u8(vsrc.val[NEON_B], 3); 153 154 // Scale src - dst 155 vres_r = vmovl_u8(vsrc.val[NEON_R]) - vdst_r; 156 vres_g = vmovl_u8(vsrc.val[NEON_G]) - vdst_g; 157 vres_b = vmovl_u8(vsrc.val[NEON_B]) - vdst_b; 158 159 vres_r = vshrq_n_u16(vres_r * vscale, 8); 160 vres_g = vshrq_n_u16(vres_g * vscale, 8); 161 vres_b = vshrq_n_u16(vres_b * vscale, 8); 162 163 vres_r += vdst_r; 164 vres_g += vdst_g; 165 vres_b += vdst_b; 166 167 // Combine 168 vres_b = vsliq_n_u16(vres_b, vres_g, 5); // insert green into blue 169 vres_b = vsliq_n_u16(vres_b, vres_r, 6+5); // insert red into green/blue 170 171 // Store 172 vst1q_u16(dst, vres_b); 173 dst += 8; 174 count -= 8; 175 } 176 if (count > 0) { 177 int scale = SkAlpha255To256(alpha); 178 do { 179 SkPMColor c = *src++; 180 SkPMColorAssert(c); 181 uint16_t d = *dst; 182 *dst++ = SkPackRGB16( 183 SkAlphaBlend(SkPacked32ToR16(c), SkGetPackedR16(d), scale), 184 SkAlphaBlend(SkPacked32ToG16(c), SkGetPackedG16(d), scale), 185 SkAlphaBlend(SkPacked32ToB16(c), SkGetPackedB16(d), scale)); 186 } while (--count != 0); 187 } 188 } 189 190 #ifdef SK_CPU_ARM32 191 void S32A_D565_Opaque_neon(uint16_t* SK_RESTRICT dst, 192 const SkPMColor* SK_RESTRICT src, int count, 193 U8CPU alpha, int /*x*/, int /*y*/) { 194 SkASSERT(255 == alpha); 195 196 if (count >= 8) { 197 uint16_t* SK_RESTRICT keep_dst = 0; 198 199 asm volatile ( 200 "ands ip, %[count], #7 \n\t" 201 "vmov.u8 d31, #1<<7 \n\t" 202 "vld1.16 {q12}, [%[dst]] \n\t" 203 "vld4.8 {d0-d3}, [%[src]] \n\t" 204 // Thumb does not support the standard ARM conditional 205 // instructions but instead requires the 'it' instruction 206 // to signal conditional execution 207 "it eq \n\t" 208 "moveq ip, #8 \n\t" 209 "mov %[keep_dst], %[dst] \n\t" 210 211 "add %[src], %[src], ip, LSL#2 \n\t" 212 "add %[dst], %[dst], ip, LSL#1 \n\t" 213 "subs %[count], %[count], ip \n\t" 214 "b 9f \n\t" 215 // LOOP 216 "2: \n\t" 217 218 "vld1.16 {q12}, [%[dst]]! \n\t" 219 "vld4.8 {d0-d3}, [%[src]]! \n\t" 220 "vst1.16 {q10}, [%[keep_dst]] \n\t" 221 "sub %[keep_dst], %[dst], #8*2 \n\t" 222 "subs %[count], %[count], #8 \n\t" 223 "9: \n\t" 224 "pld [%[dst],#32] \n\t" 225 // expand 0565 q12 to 8888 {d4-d7} 226 "vmovn.u16 d4, q12 \n\t" 227 "vshr.u16 q11, q12, #5 \n\t" 228 "vshr.u16 q10, q12, #6+5 \n\t" 229 "vmovn.u16 d5, q11 \n\t" 230 "vmovn.u16 d6, q10 \n\t" 231 "vshl.u8 d4, d4, #3 \n\t" 232 "vshl.u8 d5, d5, #2 \n\t" 233 "vshl.u8 d6, d6, #3 \n\t" 234 235 "vmovl.u8 q14, d31 \n\t" 236 "vmovl.u8 q13, d31 \n\t" 237 "vmovl.u8 q12, d31 \n\t" 238 239 // duplicate in 4/2/1 & 8pix vsns 240 "vmvn.8 d30, d3 \n\t" 241 "vmlal.u8 q14, d30, d6 \n\t" 242 "vmlal.u8 q13, d30, d5 \n\t" 243 "vmlal.u8 q12, d30, d4 \n\t" 244 "vshr.u16 q8, q14, #5 \n\t" 245 "vshr.u16 q9, q13, #6 \n\t" 246 "vaddhn.u16 d6, q14, q8 \n\t" 247 "vshr.u16 q8, q12, #5 \n\t" 248 "vaddhn.u16 d5, q13, q9 \n\t" 249 "vaddhn.u16 d4, q12, q8 \n\t" 250 // intentionally don't calculate alpha 251 // result in d4-d6 252 253 #ifdef SK_PMCOLOR_IS_RGBA 254 "vqadd.u8 d6, d6, d0 \n\t" 255 "vqadd.u8 d5, d5, d1 \n\t" 256 "vqadd.u8 d4, d4, d2 \n\t" 257 #else 258 "vqadd.u8 d6, d6, d2 \n\t" 259 "vqadd.u8 d5, d5, d1 \n\t" 260 "vqadd.u8 d4, d4, d0 \n\t" 261 #endif 262 263 // pack 8888 {d4-d6} to 0565 q10 264 "vshll.u8 q10, d6, #8 \n\t" 265 "vshll.u8 q3, d5, #8 \n\t" 266 "vshll.u8 q2, d4, #8 \n\t" 267 "vsri.u16 q10, q3, #5 \n\t" 268 "vsri.u16 q10, q2, #11 \n\t" 269 270 "bne 2b \n\t" 271 272 "1: \n\t" 273 "vst1.16 {q10}, [%[keep_dst]] \n\t" 274 : [count] "+r" (count) 275 : [dst] "r" (dst), [keep_dst] "r" (keep_dst), [src] "r" (src) 276 : "ip", "cc", "memory", "d0","d1","d2","d3","d4","d5","d6","d7", 277 "d16","d17","d18","d19","d20","d21","d22","d23","d24","d25","d26","d27","d28","d29", 278 "d30","d31" 279 ); 280 } 281 else 282 { // handle count < 8 283 uint16_t* SK_RESTRICT keep_dst = 0; 284 285 asm volatile ( 286 "vmov.u8 d31, #1<<7 \n\t" 287 "mov %[keep_dst], %[dst] \n\t" 288 289 "tst %[count], #4 \n\t" 290 "beq 14f \n\t" 291 "vld1.16 {d25}, [%[dst]]! \n\t" 292 "vld1.32 {q1}, [%[src]]! \n\t" 293 294 "14: \n\t" 295 "tst %[count], #2 \n\t" 296 "beq 12f \n\t" 297 "vld1.32 {d24[1]}, [%[dst]]! \n\t" 298 "vld1.32 {d1}, [%[src]]! \n\t" 299 300 "12: \n\t" 301 "tst %[count], #1 \n\t" 302 "beq 11f \n\t" 303 "vld1.16 {d24[1]}, [%[dst]]! \n\t" 304 "vld1.32 {d0[1]}, [%[src]]! \n\t" 305 306 "11: \n\t" 307 // unzips achieve the same as a vld4 operation 308 "vuzp.u16 q0, q1 \n\t" 309 "vuzp.u8 d0, d1 \n\t" 310 "vuzp.u8 d2, d3 \n\t" 311 // expand 0565 q12 to 8888 {d4-d7} 312 "vmovn.u16 d4, q12 \n\t" 313 "vshr.u16 q11, q12, #5 \n\t" 314 "vshr.u16 q10, q12, #6+5 \n\t" 315 "vmovn.u16 d5, q11 \n\t" 316 "vmovn.u16 d6, q10 \n\t" 317 "vshl.u8 d4, d4, #3 \n\t" 318 "vshl.u8 d5, d5, #2 \n\t" 319 "vshl.u8 d6, d6, #3 \n\t" 320 321 "vmovl.u8 q14, d31 \n\t" 322 "vmovl.u8 q13, d31 \n\t" 323 "vmovl.u8 q12, d31 \n\t" 324 325 // duplicate in 4/2/1 & 8pix vsns 326 "vmvn.8 d30, d3 \n\t" 327 "vmlal.u8 q14, d30, d6 \n\t" 328 "vmlal.u8 q13, d30, d5 \n\t" 329 "vmlal.u8 q12, d30, d4 \n\t" 330 "vshr.u16 q8, q14, #5 \n\t" 331 "vshr.u16 q9, q13, #6 \n\t" 332 "vaddhn.u16 d6, q14, q8 \n\t" 333 "vshr.u16 q8, q12, #5 \n\t" 334 "vaddhn.u16 d5, q13, q9 \n\t" 335 "vaddhn.u16 d4, q12, q8 \n\t" 336 // intentionally don't calculate alpha 337 // result in d4-d6 338 339 #ifdef SK_PMCOLOR_IS_RGBA 340 "vqadd.u8 d6, d6, d0 \n\t" 341 "vqadd.u8 d5, d5, d1 \n\t" 342 "vqadd.u8 d4, d4, d2 \n\t" 343 #else 344 "vqadd.u8 d6, d6, d2 \n\t" 345 "vqadd.u8 d5, d5, d1 \n\t" 346 "vqadd.u8 d4, d4, d0 \n\t" 347 #endif 348 349 // pack 8888 {d4-d6} to 0565 q10 350 "vshll.u8 q10, d6, #8 \n\t" 351 "vshll.u8 q3, d5, #8 \n\t" 352 "vshll.u8 q2, d4, #8 \n\t" 353 "vsri.u16 q10, q3, #5 \n\t" 354 "vsri.u16 q10, q2, #11 \n\t" 355 356 // store 357 "tst %[count], #4 \n\t" 358 "beq 24f \n\t" 359 "vst1.16 {d21}, [%[keep_dst]]! \n\t" 360 361 "24: \n\t" 362 "tst %[count], #2 \n\t" 363 "beq 22f \n\t" 364 "vst1.32 {d20[1]}, [%[keep_dst]]! \n\t" 365 366 "22: \n\t" 367 "tst %[count], #1 \n\t" 368 "beq 21f \n\t" 369 "vst1.16 {d20[1]}, [%[keep_dst]]! \n\t" 370 371 "21: \n\t" 372 : [count] "+r" (count) 373 : [dst] "r" (dst), [keep_dst] "r" (keep_dst), [src] "r" (src) 374 : "ip", "cc", "memory", "d0","d1","d2","d3","d4","d5","d6","d7", 375 "d16","d17","d18","d19","d20","d21","d22","d23","d24","d25","d26","d27","d28","d29", 376 "d30","d31" 377 ); 378 } 379 } 380 381 #else // #ifdef SK_CPU_ARM32 382 383 void S32A_D565_Opaque_neon(uint16_t* SK_RESTRICT dst, 384 const SkPMColor* SK_RESTRICT src, int count, 385 U8CPU alpha, int /*x*/, int /*y*/) { 386 SkASSERT(255 == alpha); 387 388 if (count >= 16) { 389 asm ( 390 "movi v4.8h, #0x80 \t\n" 391 392 "1: \t\n" 393 "sub %w[count], %w[count], #16 \t\n" 394 "ld1 {v16.8h-v17.8h}, [%[dst]] \t\n" 395 "ld4 {v0.16b-v3.16b}, [%[src]], #64 \t\n" 396 "prfm pldl1keep, [%[src],#512] \t\n" 397 "prfm pldl1keep, [%[dst],#256] \t\n" 398 "ushr v20.8h, v17.8h, #5 \t\n" 399 "ushr v31.8h, v16.8h, #5 \t\n" 400 "xtn v6.8b, v31.8h \t\n" 401 "xtn2 v6.16b, v20.8h \t\n" 402 "ushr v20.8h, v17.8h, #11 \t\n" 403 "shl v19.16b, v6.16b, #2 \t\n" 404 "ushr v31.8h, v16.8h, #11 \t\n" 405 "xtn v22.8b, v31.8h \t\n" 406 "xtn2 v22.16b, v20.8h \t\n" 407 "shl v18.16b, v22.16b, #3 \t\n" 408 "mvn v3.16b, v3.16b \t\n" 409 "xtn v16.8b, v16.8h \t\n" 410 "mov v7.16b, v4.16b \t\n" 411 "xtn2 v16.16b, v17.8h \t\n" 412 "umlal v7.8h, v3.8b, v19.8b \t\n" 413 "shl v16.16b, v16.16b, #3 \t\n" 414 "mov v22.16b, v4.16b \t\n" 415 "ushr v24.8h, v7.8h, #6 \t\n" 416 "umlal v22.8h, v3.8b, v18.8b \t\n" 417 "ushr v20.8h, v22.8h, #5 \t\n" 418 "addhn v20.8b, v22.8h, v20.8h \t\n" 419 "cmp %w[count], #16 \t\n" 420 "mov v6.16b, v4.16b \t\n" 421 "mov v5.16b, v4.16b \t\n" 422 "umlal v6.8h, v3.8b, v16.8b \t\n" 423 "umlal2 v5.8h, v3.16b, v19.16b \t\n" 424 "mov v17.16b, v4.16b \t\n" 425 "ushr v19.8h, v6.8h, #5 \t\n" 426 "umlal2 v17.8h, v3.16b, v18.16b \t\n" 427 "addhn v7.8b, v7.8h, v24.8h \t\n" 428 "ushr v18.8h, v5.8h, #6 \t\n" 429 "ushr v21.8h, v17.8h, #5 \t\n" 430 "addhn2 v7.16b, v5.8h, v18.8h \t\n" 431 "addhn2 v20.16b, v17.8h, v21.8h \t\n" 432 "mov v22.16b, v4.16b \t\n" 433 "addhn v6.8b, v6.8h, v19.8h \t\n" 434 "umlal2 v22.8h, v3.16b, v16.16b \t\n" 435 "ushr v5.8h, v22.8h, #5 \t\n" 436 "addhn2 v6.16b, v22.8h, v5.8h \t\n" 437 "uqadd v7.16b, v1.16b, v7.16b \t\n" 438 #if SK_PMCOLOR_BYTE_ORDER(B,G,R,A) 439 "uqadd v20.16b, v2.16b, v20.16b \t\n" 440 "uqadd v6.16b, v0.16b, v6.16b \t\n" 441 #elif SK_PMCOLOR_BYTE_ORDER(R,G,B,A) 442 "uqadd v20.16b, v0.16b, v20.16b \t\n" 443 "uqadd v6.16b, v2.16b, v6.16b \t\n" 444 #else 445 #error "This function only supports BGRA and RGBA." 446 #endif 447 "shll v22.8h, v20.8b, #8 \t\n" 448 "shll v5.8h, v7.8b, #8 \t\n" 449 "sri v22.8h, v5.8h, #5 \t\n" 450 "shll v17.8h, v6.8b, #8 \t\n" 451 "shll2 v23.8h, v20.16b, #8 \t\n" 452 "shll2 v7.8h, v7.16b, #8 \t\n" 453 "sri v22.8h, v17.8h, #11 \t\n" 454 "sri v23.8h, v7.8h, #5 \t\n" 455 "shll2 v6.8h, v6.16b, #8 \t\n" 456 "st1 {v22.8h}, [%[dst]], #16 \t\n" 457 "sri v23.8h, v6.8h, #11 \t\n" 458 "st1 {v23.8h}, [%[dst]], #16 \t\n" 459 "b.ge 1b \t\n" 460 : [dst] "+&r" (dst), [src] "+&r" (src), [count] "+&r" (count) 461 :: "cc", "memory", "v0", "v1", "v2", "v3", "v4", "v5", "v6", "v7", 462 "v16", "v17", "v18", "v19", "v20", "v21", "v22", "v23", "v24", 463 "v31" 464 ); 465 } 466 // Leftovers 467 if (count > 0) { 468 do { 469 SkPMColor c = *src++; 470 SkPMColorAssert(c); 471 if (c) { 472 *dst = SkSrcOver32To16(c, *dst); 473 } 474 dst += 1; 475 } while (--count != 0); 476 } 477 } 478 #endif // #ifdef SK_CPU_ARM32 479 480 static uint32_t pmcolor_to_expand16(SkPMColor c) { 481 unsigned r = SkGetPackedR32(c); 482 unsigned g = SkGetPackedG32(c); 483 unsigned b = SkGetPackedB32(c); 484 return (g << 24) | (r << 13) | (b << 2); 485 } 486 487 void Color32A_D565_neon(uint16_t dst[], SkPMColor src, int count, int x, int y) { 488 uint32_t src_expand; 489 unsigned scale; 490 uint16x8_t vmask_blue; 491 492 if (count <= 0) return; 493 SkASSERT(((size_t)dst & 0x01) == 0); 494 495 /* 496 * This preamble code is in order to make dst aligned to 8 bytes 497 * in the next mutiple bytes read & write access. 498 */ 499 src_expand = pmcolor_to_expand16(src); 500 scale = SkAlpha255To256(0xFF - SkGetPackedA32(src)) >> 3; 501 502 #define DST_ALIGN 8 503 504 /* 505 * preamble_size is in byte, meantime, this blend32_16_row_neon updates 2 bytes at a time. 506 */ 507 int preamble_size = (DST_ALIGN - (size_t)dst) & (DST_ALIGN - 1); 508 509 for (int i = 0; i < preamble_size; i+=2, dst++) { 510 uint32_t dst_expand = SkExpand_rgb_16(*dst) * scale; 511 *dst = SkCompact_rgb_16((src_expand + dst_expand) >> 5); 512 if (--count == 0) 513 break; 514 } 515 516 int count16 = 0; 517 count16 = count >> 4; 518 vmask_blue = vmovq_n_u16(SK_B16_MASK); 519 520 if (count16) { 521 uint16x8_t wide_sr; 522 uint16x8_t wide_sg; 523 uint16x8_t wide_sb; 524 uint16x8_t wide_256_sa; 525 526 unsigned sr = SkGetPackedR32(src); 527 unsigned sg = SkGetPackedG32(src); 528 unsigned sb = SkGetPackedB32(src); 529 unsigned sa = SkGetPackedA32(src); 530 531 // Operation: dst_rgb = src_rgb + ((256 - src_a) >> 3) x dst_rgb 532 // sr: 8-bit based, dr: 5-bit based, with dr x ((256-sa)>>3), 5-bit left shifted, 533 //thus, for sr, do 2-bit left shift to match MSB : (8 + 2 = 5 + 5) 534 wide_sr = vshlq_n_u16(vmovl_u8(vdup_n_u8(sr)), 2); // widen and src_red shift 535 536 // sg: 8-bit based, dg: 6-bit based, with dg x ((256-sa)>>3), 5-bit left shifted, 537 //thus, for sg, do 3-bit left shift to match MSB : (8 + 3 = 6 + 5) 538 wide_sg = vshlq_n_u16(vmovl_u8(vdup_n_u8(sg)), 3); // widen and src_grn shift 539 540 // sb: 8-bit based, db: 5-bit based, with db x ((256-sa)>>3), 5-bit left shifted, 541 //thus, for sb, do 2-bit left shift to match MSB : (8 + 2 = 5 + 5) 542 wide_sb = vshlq_n_u16(vmovl_u8(vdup_n_u8(sb)), 2); // widen and src blu shift 543 544 wide_256_sa = 545 vshrq_n_u16(vsubw_u8(vdupq_n_u16(256), vdup_n_u8(sa)), 3); // (256 - sa) >> 3 546 547 while (count16-- > 0) { 548 uint16x8_t vdst1, vdst1_r, vdst1_g, vdst1_b; 549 uint16x8_t vdst2, vdst2_r, vdst2_g, vdst2_b; 550 vdst1 = vld1q_u16(dst); 551 dst += 8; 552 vdst2 = vld1q_u16(dst); 553 dst -= 8; //to store dst again. 554 555 vdst1_g = vshlq_n_u16(vdst1, SK_R16_BITS); // shift green to top of lanes 556 vdst1_b = vdst1 & vmask_blue; // extract blue 557 vdst1_r = vshrq_n_u16(vdst1, SK_R16_SHIFT); // extract red 558 vdst1_g = vshrq_n_u16(vdst1_g, SK_R16_BITS + SK_B16_BITS); // extract green 559 560 vdst2_g = vshlq_n_u16(vdst2, SK_R16_BITS); // shift green to top of lanes 561 vdst2_b = vdst2 & vmask_blue; // extract blue 562 vdst2_r = vshrq_n_u16(vdst2, SK_R16_SHIFT); // extract red 563 vdst2_g = vshrq_n_u16(vdst2_g, SK_R16_BITS + SK_B16_BITS); // extract green 564 565 vdst1_r = vmlaq_u16(wide_sr, wide_256_sa, vdst1_r); // sr + (256-sa) x dr1 566 vdst1_g = vmlaq_u16(wide_sg, wide_256_sa, vdst1_g); // sg + (256-sa) x dg1 567 vdst1_b = vmlaq_u16(wide_sb, wide_256_sa, vdst1_b); // sb + (256-sa) x db1 568 569 vdst2_r = vmlaq_u16(wide_sr, wide_256_sa, vdst2_r); // sr + (256-sa) x dr2 570 vdst2_g = vmlaq_u16(wide_sg, wide_256_sa, vdst2_g); // sg + (256-sa) x dg2 571 vdst2_b = vmlaq_u16(wide_sb, wide_256_sa, vdst2_b); // sb + (256-sa) x db2 572 573 vdst1_r = vshrq_n_u16(vdst1_r, 5); // 5-bit right shift for 5-bit red 574 vdst1_g = vshrq_n_u16(vdst1_g, 5); // 5-bit right shift for 6-bit green 575 vdst1_b = vshrq_n_u16(vdst1_b, 5); // 5-bit right shift for 5-bit blue 576 577 vdst1 = vsliq_n_u16(vdst1_b, vdst1_g, SK_G16_SHIFT); // insert green into blue 578 vdst1 = vsliq_n_u16(vdst1, vdst1_r, SK_R16_SHIFT); // insert red into green/blue 579 580 vdst2_r = vshrq_n_u16(vdst2_r, 5); // 5-bit right shift for 5-bit red 581 vdst2_g = vshrq_n_u16(vdst2_g, 5); // 5-bit right shift for 6-bit green 582 vdst2_b = vshrq_n_u16(vdst2_b, 5); // 5-bit right shift for 5-bit blue 583 584 vdst2 = vsliq_n_u16(vdst2_b, vdst2_g, SK_G16_SHIFT); // insert green into blue 585 vdst2 = vsliq_n_u16(vdst2, vdst2_r, SK_R16_SHIFT); // insert red into green/blue 586 587 vst1q_u16(dst, vdst1); 588 dst += 8; 589 vst1q_u16(dst, vdst2); 590 dst += 8; 591 } 592 } 593 594 count &= 0xF; 595 if (count > 0) { 596 do { 597 uint32_t dst_expand = SkExpand_rgb_16(*dst) * scale; 598 *dst = SkCompact_rgb_16((src_expand + dst_expand) >> 5); 599 dst += 1; 600 } while (--count != 0); 601 } 602 } 603 604 static inline uint16x8_t SkDiv255Round_neon8(uint16x8_t prod) { 605 prod += vdupq_n_u16(128); 606 prod += vshrq_n_u16(prod, 8); 607 return vshrq_n_u16(prod, 8); 608 } 609 610 void S32A_D565_Blend_neon(uint16_t* SK_RESTRICT dst, 611 const SkPMColor* SK_RESTRICT src, int count, 612 U8CPU alpha, int /*x*/, int /*y*/) { 613 SkASSERT(255 > alpha); 614 615 /* This code implements a Neon version of S32A_D565_Blend. The results have 616 * a few mismatches compared to the original code. These mismatches never 617 * exceed 1. 618 */ 619 620 if (count >= 8) { 621 uint16x8_t valpha_max, vmask_blue; 622 uint8x8_t valpha; 623 624 // prepare constants 625 valpha_max = vmovq_n_u16(255); 626 valpha = vdup_n_u8(alpha); 627 vmask_blue = vmovq_n_u16(SK_B16_MASK); 628 629 do { 630 uint16x8_t vdst, vdst_r, vdst_g, vdst_b; 631 uint16x8_t vres_a, vres_r, vres_g, vres_b; 632 uint8x8x4_t vsrc; 633 634 // load pixels 635 vdst = vld1q_u16(dst); 636 #ifdef SK_CPU_ARM64 637 vsrc = sk_vld4_u8_arm64_4(src); 638 #elif (__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ > 6)) 639 asm ( 640 "vld4.u8 %h[vsrc], [%[src]]!" 641 : [vsrc] "=w" (vsrc), [src] "+&r" (src) 642 : : 643 ); 644 #else 645 register uint8x8_t d0 asm("d0"); 646 register uint8x8_t d1 asm("d1"); 647 register uint8x8_t d2 asm("d2"); 648 register uint8x8_t d3 asm("d3"); 649 650 asm volatile ( 651 "vld4.u8 {d0-d3},[%[src]]!;" 652 : "=w" (d0), "=w" (d1), "=w" (d2), "=w" (d3), 653 [src] "+&r" (src) 654 : : 655 ); 656 vsrc.val[0] = d0; 657 vsrc.val[1] = d1; 658 vsrc.val[2] = d2; 659 vsrc.val[3] = d3; 660 #endif 661 662 663 // deinterleave dst 664 vdst_g = vshlq_n_u16(vdst, SK_R16_BITS); // shift green to top of lanes 665 vdst_b = vdst & vmask_blue; // extract blue 666 vdst_r = vshrq_n_u16(vdst, SK_R16_SHIFT); // extract red 667 vdst_g = vshrq_n_u16(vdst_g, SK_R16_BITS + SK_B16_BITS); // extract green 668 669 // shift src to 565 670 vsrc.val[NEON_R] = vshr_n_u8(vsrc.val[NEON_R], 8 - SK_R16_BITS); 671 vsrc.val[NEON_G] = vshr_n_u8(vsrc.val[NEON_G], 8 - SK_G16_BITS); 672 vsrc.val[NEON_B] = vshr_n_u8(vsrc.val[NEON_B], 8 - SK_B16_BITS); 673 674 // calc src * src_scale 675 vres_a = vmull_u8(vsrc.val[NEON_A], valpha); 676 vres_r = vmull_u8(vsrc.val[NEON_R], valpha); 677 vres_g = vmull_u8(vsrc.val[NEON_G], valpha); 678 vres_b = vmull_u8(vsrc.val[NEON_B], valpha); 679 680 // prepare dst_scale 681 vres_a = SkDiv255Round_neon8(vres_a); 682 vres_a = valpha_max - vres_a; // 255 - (sa * src_scale) / 255 683 684 // add dst * dst_scale to previous result 685 vres_r = vmlaq_u16(vres_r, vdst_r, vres_a); 686 vres_g = vmlaq_u16(vres_g, vdst_g, vres_a); 687 vres_b = vmlaq_u16(vres_b, vdst_b, vres_a); 688 689 #ifdef S32A_D565_BLEND_EXACT 690 // It is possible to get exact results with this but it is slow, 691 // even slower than C code in some cases 692 vres_r = SkDiv255Round_neon8(vres_r); 693 vres_g = SkDiv255Round_neon8(vres_g); 694 vres_b = SkDiv255Round_neon8(vres_b); 695 #else 696 vres_r = vrshrq_n_u16(vres_r, 8); 697 vres_g = vrshrq_n_u16(vres_g, 8); 698 vres_b = vrshrq_n_u16(vres_b, 8); 699 #endif 700 // pack result 701 vres_b = vsliq_n_u16(vres_b, vres_g, SK_G16_SHIFT); // insert green into blue 702 vres_b = vsliq_n_u16(vres_b, vres_r, SK_R16_SHIFT); // insert red into green/blue 703 704 // store 705 vst1q_u16(dst, vres_b); 706 dst += 8; 707 count -= 8; 708 } while (count >= 8); 709 } 710 711 // leftovers 712 while (count-- > 0) { 713 SkPMColor sc = *src++; 714 if (sc) { 715 uint16_t dc = *dst; 716 unsigned dst_scale = 255 - SkMulDiv255Round(SkGetPackedA32(sc), alpha); 717 unsigned dr = (SkPacked32ToR16(sc) * alpha) + (SkGetPackedR16(dc) * dst_scale); 718 unsigned dg = (SkPacked32ToG16(sc) * alpha) + (SkGetPackedG16(dc) * dst_scale); 719 unsigned db = (SkPacked32ToB16(sc) * alpha) + (SkGetPackedB16(dc) * dst_scale); 720 *dst = SkPackRGB16(SkDiv255Round(dr), SkDiv255Round(dg), SkDiv255Round(db)); 721 } 722 dst += 1; 723 } 724 } 725 726 /* dither matrix for Neon, derived from gDitherMatrix_3Bit_16. 727 * each dither value is spaced out into byte lanes, and repeated 728 * to allow an 8-byte load from offsets 0, 1, 2 or 3 from the 729 * start of each row. 730 */ 731 static const uint8_t gDitherMatrix_Neon[48] = { 732 0, 4, 1, 5, 0, 4, 1, 5, 0, 4, 1, 5, 733 6, 2, 7, 3, 6, 2, 7, 3, 6, 2, 7, 3, 734 1, 5, 0, 4, 1, 5, 0, 4, 1, 5, 0, 4, 735 7, 3, 6, 2, 7, 3, 6, 2, 7, 3, 6, 2, 736 737 }; 738 739 void S32_D565_Blend_Dither_neon(uint16_t *dst, const SkPMColor *src, 740 int count, U8CPU alpha, int x, int y) 741 { 742 743 SkASSERT(255 > alpha); 744 745 // rescale alpha to range 1 - 256 746 int scale = SkAlpha255To256(alpha); 747 748 if (count >= 8) { 749 /* select row and offset for dither array */ 750 const uint8_t *dstart = &gDitherMatrix_Neon[(y&3)*12 + (x&3)]; 751 752 uint8x8_t vdither = vld1_u8(dstart); // load dither values 753 uint8x8_t vdither_g = vshr_n_u8(vdither, 1); // calc. green dither values 754 755 int16x8_t vscale = vdupq_n_s16(scale); // duplicate scale into neon reg 756 uint16x8_t vmask_b = vdupq_n_u16(0x1F); // set up blue mask 757 758 do { 759 760 uint8x8x4_t vsrc; 761 uint8x8_t vsrc_r, vsrc_g, vsrc_b; 762 uint8x8_t vsrc565_r, vsrc565_g, vsrc565_b; 763 uint16x8_t vsrc_dit_r, vsrc_dit_g, vsrc_dit_b; 764 uint16x8_t vsrc_res_r, vsrc_res_g, vsrc_res_b; 765 uint16x8_t vdst; 766 uint16x8_t vdst_r, vdst_g, vdst_b; 767 int16x8_t vres_r, vres_g, vres_b; 768 int8x8_t vres8_r, vres8_g, vres8_b; 769 770 // Load source and add dither 771 #ifdef SK_CPU_ARM64 772 vsrc = sk_vld4_u8_arm64_3(src); 773 #else 774 { 775 register uint8x8_t d0 asm("d0"); 776 register uint8x8_t d1 asm("d1"); 777 register uint8x8_t d2 asm("d2"); 778 register uint8x8_t d3 asm("d3"); 779 780 asm ( 781 "vld4.8 {d0-d3},[%[src]]! " 782 : "=w" (d0), "=w" (d1), "=w" (d2), "=w" (d3), [src] "+&r" (src) 783 : 784 ); 785 vsrc.val[0] = d0; 786 vsrc.val[1] = d1; 787 vsrc.val[2] = d2; 788 } 789 #endif 790 vsrc_r = vsrc.val[NEON_R]; 791 vsrc_g = vsrc.val[NEON_G]; 792 vsrc_b = vsrc.val[NEON_B]; 793 794 vsrc565_g = vshr_n_u8(vsrc_g, 6); // calc. green >> 6 795 vsrc565_r = vshr_n_u8(vsrc_r, 5); // calc. red >> 5 796 vsrc565_b = vshr_n_u8(vsrc_b, 5); // calc. blue >> 5 797 798 vsrc_dit_g = vaddl_u8(vsrc_g, vdither_g); // add in dither to green and widen 799 vsrc_dit_r = vaddl_u8(vsrc_r, vdither); // add in dither to red and widen 800 vsrc_dit_b = vaddl_u8(vsrc_b, vdither); // add in dither to blue and widen 801 802 vsrc_dit_r = vsubw_u8(vsrc_dit_r, vsrc565_r); // sub shifted red from result 803 vsrc_dit_g = vsubw_u8(vsrc_dit_g, vsrc565_g); // sub shifted green from result 804 vsrc_dit_b = vsubw_u8(vsrc_dit_b, vsrc565_b); // sub shifted blue from result 805 806 vsrc_res_r = vshrq_n_u16(vsrc_dit_r, 3); 807 vsrc_res_g = vshrq_n_u16(vsrc_dit_g, 2); 808 vsrc_res_b = vshrq_n_u16(vsrc_dit_b, 3); 809 810 // Load dst and unpack 811 vdst = vld1q_u16(dst); 812 vdst_g = vshrq_n_u16(vdst, 5); // shift down to get green 813 vdst_r = vshrq_n_u16(vshlq_n_u16(vdst, 5), 5+5); // double shift to extract red 814 vdst_b = vandq_u16(vdst, vmask_b); // mask to get blue 815 816 // subtract dst from src and widen 817 vres_r = vsubq_s16(vreinterpretq_s16_u16(vsrc_res_r), vreinterpretq_s16_u16(vdst_r)); 818 vres_g = vsubq_s16(vreinterpretq_s16_u16(vsrc_res_g), vreinterpretq_s16_u16(vdst_g)); 819 vres_b = vsubq_s16(vreinterpretq_s16_u16(vsrc_res_b), vreinterpretq_s16_u16(vdst_b)); 820 821 // multiply diffs by scale and shift 822 vres_r = vmulq_s16(vres_r, vscale); 823 vres_g = vmulq_s16(vres_g, vscale); 824 vres_b = vmulq_s16(vres_b, vscale); 825 826 vres8_r = vshrn_n_s16(vres_r, 8); 827 vres8_g = vshrn_n_s16(vres_g, 8); 828 vres8_b = vshrn_n_s16(vres_b, 8); 829 830 // add dst to result 831 vres_r = vaddw_s8(vreinterpretq_s16_u16(vdst_r), vres8_r); 832 vres_g = vaddw_s8(vreinterpretq_s16_u16(vdst_g), vres8_g); 833 vres_b = vaddw_s8(vreinterpretq_s16_u16(vdst_b), vres8_b); 834 835 // put result into 565 format 836 vres_b = vsliq_n_s16(vres_b, vres_g, 5); // shift up green and insert into blue 837 vres_b = vsliq_n_s16(vres_b, vres_r, 6+5); // shift up red and insert into blue 838 839 // Store result 840 vst1q_u16(dst, vreinterpretq_u16_s16(vres_b)); 841 842 // Next iteration 843 dst += 8; 844 count -= 8; 845 846 } while (count >= 8); 847 } 848 849 // Leftovers 850 if (count > 0) { 851 int scale = SkAlpha255To256(alpha); 852 DITHER_565_SCAN(y); 853 do { 854 SkPMColor c = *src++; 855 SkPMColorAssert(c); 856 857 int dither = DITHER_VALUE(x); 858 int sr = SkGetPackedR32(c); 859 int sg = SkGetPackedG32(c); 860 int sb = SkGetPackedB32(c); 861 sr = SkDITHER_R32To565(sr, dither); 862 sg = SkDITHER_G32To565(sg, dither); 863 sb = SkDITHER_B32To565(sb, dither); 864 865 uint16_t d = *dst; 866 *dst++ = SkPackRGB16(SkAlphaBlend(sr, SkGetPackedR16(d), scale), 867 SkAlphaBlend(sg, SkGetPackedG16(d), scale), 868 SkAlphaBlend(sb, SkGetPackedB16(d), scale)); 869 DITHER_INC_X(x); 870 } while (--count != 0); 871 } 872 } 873 874 /* Neon version of S32_Blend_BlitRow32() 875 * portable version is in src/core/SkBlitRow_D32.cpp 876 */ 877 void S32_Blend_BlitRow32_neon(SkPMColor* SK_RESTRICT dst, 878 const SkPMColor* SK_RESTRICT src, 879 int count, U8CPU alpha) { 880 SkASSERT(alpha <= 255); 881 882 if (count <= 0) { 883 return; 884 } 885 886 uint16_t src_scale = SkAlpha255To256(alpha); 887 uint16_t dst_scale = 256 - src_scale; 888 889 while (count >= 2) { 890 uint8x8_t vsrc, vdst, vres; 891 uint16x8_t vsrc_wide, vdst_wide; 892 893 /* These commented prefetches are a big win for count 894 * values > 64 on an A9 (Pandaboard) but hurt by 10% for count = 4. 895 * They also hurt a little (<5%) on an A15 896 */ 897 //__builtin_prefetch(src+32); 898 //__builtin_prefetch(dst+32); 899 900 // Load 901 vsrc = vreinterpret_u8_u32(vld1_u32(src)); 902 vdst = vreinterpret_u8_u32(vld1_u32(dst)); 903 904 // Process src 905 vsrc_wide = vmovl_u8(vsrc); 906 vsrc_wide = vmulq_u16(vsrc_wide, vdupq_n_u16(src_scale)); 907 908 // Process dst 909 vdst_wide = vmull_u8(vdst, vdup_n_u8(dst_scale)); 910 911 // Combine 912 vdst_wide += vsrc_wide; 913 vres = vshrn_n_u16(vdst_wide, 8); 914 915 // Store 916 vst1_u32(dst, vreinterpret_u32_u8(vres)); 917 918 src += 2; 919 dst += 2; 920 count -= 2; 921 } 922 923 if (count == 1) { 924 uint8x8_t vsrc = vdup_n_u8(0), vdst = vdup_n_u8(0), vres; 925 uint16x8_t vsrc_wide, vdst_wide; 926 927 // Load 928 vsrc = vreinterpret_u8_u32(vld1_lane_u32(src, vreinterpret_u32_u8(vsrc), 0)); 929 vdst = vreinterpret_u8_u32(vld1_lane_u32(dst, vreinterpret_u32_u8(vdst), 0)); 930 931 // Process 932 vsrc_wide = vmovl_u8(vsrc); 933 vsrc_wide = vmulq_u16(vsrc_wide, vdupq_n_u16(src_scale)); 934 vdst_wide = vmull_u8(vdst, vdup_n_u8(dst_scale)); 935 vdst_wide += vsrc_wide; 936 vres = vshrn_n_u16(vdst_wide, 8); 937 938 // Store 939 vst1_lane_u32(dst, vreinterpret_u32_u8(vres), 0); 940 } 941 } 942 943 #ifdef SK_CPU_ARM32 944 void S32A_Blend_BlitRow32_neon(SkPMColor* SK_RESTRICT dst, 945 const SkPMColor* SK_RESTRICT src, 946 int count, U8CPU alpha) { 947 948 SkASSERT(255 > alpha); 949 950 if (count <= 0) { 951 return; 952 } 953 954 unsigned alpha256 = SkAlpha255To256(alpha); 955 956 // First deal with odd counts 957 if (count & 1) { 958 uint8x8_t vsrc = vdup_n_u8(0), vdst = vdup_n_u8(0), vres; 959 uint16x8_t vdst_wide, vsrc_wide; 960 unsigned dst_scale; 961 962 // Load 963 vsrc = vreinterpret_u8_u32(vld1_lane_u32(src, vreinterpret_u32_u8(vsrc), 0)); 964 vdst = vreinterpret_u8_u32(vld1_lane_u32(dst, vreinterpret_u32_u8(vdst), 0)); 965 966 // Calc dst_scale 967 dst_scale = vget_lane_u8(vsrc, 3); 968 dst_scale = SkAlphaMulInv256(dst_scale, alpha256); 969 970 // Process src 971 vsrc_wide = vmovl_u8(vsrc); 972 vsrc_wide = vmulq_n_u16(vsrc_wide, alpha256); 973 974 // Process dst 975 vdst_wide = vmovl_u8(vdst); 976 vdst_wide = vmulq_n_u16(vdst_wide, dst_scale); 977 978 // Combine 979 vdst_wide += vsrc_wide; 980 vres = vshrn_n_u16(vdst_wide, 8); 981 982 vst1_lane_u32(dst, vreinterpret_u32_u8(vres), 0); 983 dst++; 984 src++; 985 count--; 986 } 987 988 if (count) { 989 uint8x8_t alpha_mask; 990 static const uint8_t alpha_mask_setup[] = {3,3,3,3,7,7,7,7}; 991 alpha_mask = vld1_u8(alpha_mask_setup); 992 993 do { 994 995 uint8x8_t vsrc, vdst, vres, vsrc_alphas; 996 uint16x8_t vdst_wide, vsrc_wide, vsrc_scale, vdst_scale; 997 998 __builtin_prefetch(src+32); 999 __builtin_prefetch(dst+32); 1000 1001 // Load 1002 vsrc = vreinterpret_u8_u32(vld1_u32(src)); 1003 vdst = vreinterpret_u8_u32(vld1_u32(dst)); 1004 1005 // Prepare src_scale 1006 vsrc_scale = vdupq_n_u16(alpha256); 1007 1008 // Calc dst_scale 1009 vsrc_alphas = vtbl1_u8(vsrc, alpha_mask); 1010 vdst_scale = vmovl_u8(vsrc_alphas); 1011 // Calculate SkAlphaMulInv256(vdst_scale, vsrc_scale). 1012 // A 16-bit lane would overflow if we used 0xFFFF here, 1013 // so use an approximation with 0xFF00 that is off by 1, 1014 // and add back 1 after to get the correct value. 1015 // This is valid if alpha256 <= 255. 1016 vdst_scale = vmlsq_u16(vdupq_n_u16(0xFF00), vdst_scale, vsrc_scale); 1017 vdst_scale = vsraq_n_u16(vdst_scale, vdst_scale, 8); 1018 vdst_scale = vsraq_n_u16(vdupq_n_u16(1), vdst_scale, 8); 1019 1020 // Process src 1021 vsrc_wide = vmovl_u8(vsrc); 1022 vsrc_wide *= vsrc_scale; 1023 1024 // Process dst 1025 vdst_wide = vmovl_u8(vdst); 1026 vdst_wide *= vdst_scale; 1027 1028 // Combine 1029 vdst_wide += vsrc_wide; 1030 vres = vshrn_n_u16(vdst_wide, 8); 1031 1032 vst1_u32(dst, vreinterpret_u32_u8(vres)); 1033 1034 src += 2; 1035 dst += 2; 1036 count -= 2; 1037 } while(count); 1038 } 1039 } 1040 1041 /////////////////////////////////////////////////////////////////////////////// 1042 1043 #endif // #ifdef SK_CPU_ARM32 1044 1045 void S32A_D565_Opaque_Dither_neon (uint16_t * SK_RESTRICT dst, 1046 const SkPMColor* SK_RESTRICT src, 1047 int count, U8CPU alpha, int x, int y) { 1048 SkASSERT(255 == alpha); 1049 1050 #define UNROLL 8 1051 1052 if (count >= UNROLL) { 1053 1054 uint8x8_t dbase; 1055 const uint8_t *dstart = &gDitherMatrix_Neon[(y&3)*12 + (x&3)]; 1056 dbase = vld1_u8(dstart); 1057 1058 do { 1059 uint8x8x4_t vsrc; 1060 uint8x8_t sr, sg, sb, sa, d; 1061 uint16x8_t dst8, scale8, alpha8; 1062 uint16x8_t dst_r, dst_g, dst_b; 1063 1064 #ifdef SK_CPU_ARM64 1065 vsrc = sk_vld4_u8_arm64_4(src); 1066 #else 1067 { 1068 register uint8x8_t d0 asm("d0"); 1069 register uint8x8_t d1 asm("d1"); 1070 register uint8x8_t d2 asm("d2"); 1071 register uint8x8_t d3 asm("d3"); 1072 1073 asm ("vld4.8 {d0-d3},[%[src]]! " 1074 : "=w" (d0), "=w" (d1), "=w" (d2), "=w" (d3), [src] "+r" (src) 1075 : 1076 ); 1077 vsrc.val[0] = d0; 1078 vsrc.val[1] = d1; 1079 vsrc.val[2] = d2; 1080 vsrc.val[3] = d3; 1081 } 1082 #endif 1083 sa = vsrc.val[NEON_A]; 1084 sr = vsrc.val[NEON_R]; 1085 sg = vsrc.val[NEON_G]; 1086 sb = vsrc.val[NEON_B]; 1087 1088 /* calculate 'd', which will be 0..7 1089 * dbase[] is 0..7; alpha is 0..256; 16 bits suffice 1090 */ 1091 alpha8 = vmovl_u8(dbase); 1092 alpha8 = vmlal_u8(alpha8, sa, dbase); 1093 d = vshrn_n_u16(alpha8, 8); // narrowing too 1094 1095 // sr = sr - (sr>>5) + d 1096 /* watching for 8-bit overflow. d is 0..7; risky range of 1097 * sr is >248; and then (sr>>5) is 7 so it offsets 'd'; 1098 * safe as long as we do ((sr-sr>>5) + d) 1099 */ 1100 sr = vsub_u8(sr, vshr_n_u8(sr, 5)); 1101 sr = vadd_u8(sr, d); 1102 1103 // sb = sb - (sb>>5) + d 1104 sb = vsub_u8(sb, vshr_n_u8(sb, 5)); 1105 sb = vadd_u8(sb, d); 1106 1107 // sg = sg - (sg>>6) + d>>1; similar logic for overflows 1108 sg = vsub_u8(sg, vshr_n_u8(sg, 6)); 1109 sg = vadd_u8(sg, vshr_n_u8(d,1)); 1110 1111 // need to pick up 8 dst's -- at 16 bits each, 128 bits 1112 dst8 = vld1q_u16(dst); 1113 dst_b = vandq_u16(dst8, vdupq_n_u16(SK_B16_MASK)); 1114 dst_g = vshrq_n_u16(vshlq_n_u16(dst8, SK_R16_BITS), SK_R16_BITS + SK_B16_BITS); 1115 dst_r = vshrq_n_u16(dst8, SK_R16_SHIFT); // clearing hi bits 1116 1117 // blend 1118 scale8 = vsubw_u8(vdupq_n_u16(256), sa); 1119 1120 // combine the addq and mul, save 3 insns 1121 scale8 = vshrq_n_u16(scale8, 3); 1122 dst_b = vmlaq_u16(vshll_n_u8(sb,2), dst_b, scale8); 1123 dst_g = vmlaq_u16(vshll_n_u8(sg,3), dst_g, scale8); 1124 dst_r = vmlaq_u16(vshll_n_u8(sr,2), dst_r, scale8); 1125 1126 // repack to store 1127 dst8 = vshrq_n_u16(dst_b, 5); 1128 dst8 = vsliq_n_u16(dst8, vshrq_n_u16(dst_g, 5), 5); 1129 dst8 = vsliq_n_u16(dst8, vshrq_n_u16(dst_r,5), 11); 1130 1131 vst1q_u16(dst, dst8); 1132 1133 dst += UNROLL; 1134 count -= UNROLL; 1135 // skip x += UNROLL, since it's unchanged mod-4 1136 } while (count >= UNROLL); 1137 } 1138 #undef UNROLL 1139 1140 // residuals 1141 if (count > 0) { 1142 DITHER_565_SCAN(y); 1143 do { 1144 SkPMColor c = *src++; 1145 SkPMColorAssert(c); 1146 if (c) { 1147 unsigned a = SkGetPackedA32(c); 1148 1149 // dither and alpha are just temporary variables to work-around 1150 // an ICE in debug. 1151 unsigned dither = DITHER_VALUE(x); 1152 unsigned alpha = SkAlpha255To256(a); 1153 int d = SkAlphaMul(dither, alpha); 1154 1155 unsigned sr = SkGetPackedR32(c); 1156 unsigned sg = SkGetPackedG32(c); 1157 unsigned sb = SkGetPackedB32(c); 1158 sr = SkDITHER_R32_FOR_565(sr, d); 1159 sg = SkDITHER_G32_FOR_565(sg, d); 1160 sb = SkDITHER_B32_FOR_565(sb, d); 1161 1162 uint32_t src_expanded = (sg << 24) | (sr << 13) | (sb << 2); 1163 uint32_t dst_expanded = SkExpand_rgb_16(*dst); 1164 dst_expanded = dst_expanded * (SkAlpha255To256(255 - a) >> 3); 1165 // now src and dst expanded are in g:11 r:10 x:1 b:10 1166 *dst = SkCompact_rgb_16((src_expanded + dst_expanded) >> 5); 1167 } 1168 dst += 1; 1169 DITHER_INC_X(x); 1170 } while (--count != 0); 1171 } 1172 } 1173 1174 /////////////////////////////////////////////////////////////////////////////// 1175 1176 void S32_D565_Opaque_Dither_neon(uint16_t* SK_RESTRICT dst, 1177 const SkPMColor* SK_RESTRICT src, 1178 int count, U8CPU alpha, int x, int y) { 1179 SkASSERT(255 == alpha); 1180 1181 #define UNROLL 8 1182 if (count >= UNROLL) { 1183 uint8x8_t d; 1184 const uint8_t *dstart = &gDitherMatrix_Neon[(y&3)*12 + (x&3)]; 1185 d = vld1_u8(dstart); 1186 1187 while (count >= UNROLL) { 1188 uint8x8_t sr, sg, sb; 1189 uint16x8_t dr, dg, db; 1190 uint16x8_t dst8; 1191 uint8x8x4_t vsrc; 1192 1193 #ifdef SK_CPU_ARM64 1194 vsrc = sk_vld4_u8_arm64_3(src); 1195 #else 1196 { 1197 register uint8x8_t d0 asm("d0"); 1198 register uint8x8_t d1 asm("d1"); 1199 register uint8x8_t d2 asm("d2"); 1200 register uint8x8_t d3 asm("d3"); 1201 1202 asm ( 1203 "vld4.8 {d0-d3},[%[src]]! " 1204 : "=w" (d0), "=w" (d1), "=w" (d2), "=w" (d3), [src] "+&r" (src) 1205 : 1206 ); 1207 vsrc.val[0] = d0; 1208 vsrc.val[1] = d1; 1209 vsrc.val[2] = d2; 1210 } 1211 #endif 1212 sr = vsrc.val[NEON_R]; 1213 sg = vsrc.val[NEON_G]; 1214 sb = vsrc.val[NEON_B]; 1215 1216 /* XXX: if we want to prefetch, hide it in the above asm() 1217 * using the gcc __builtin_prefetch(), the prefetch will 1218 * fall to the bottom of the loop -- it won't stick up 1219 * at the top of the loop, just after the vld4. 1220 */ 1221 1222 // sr = sr - (sr>>5) + d 1223 sr = vsub_u8(sr, vshr_n_u8(sr, 5)); 1224 dr = vaddl_u8(sr, d); 1225 1226 // sb = sb - (sb>>5) + d 1227 sb = vsub_u8(sb, vshr_n_u8(sb, 5)); 1228 db = vaddl_u8(sb, d); 1229 1230 // sg = sg - (sg>>6) + d>>1; similar logic for overflows 1231 sg = vsub_u8(sg, vshr_n_u8(sg, 6)); 1232 dg = vaddl_u8(sg, vshr_n_u8(d, 1)); 1233 1234 // pack high bits of each into 565 format (rgb, b is lsb) 1235 dst8 = vshrq_n_u16(db, 3); 1236 dst8 = vsliq_n_u16(dst8, vshrq_n_u16(dg, 2), 5); 1237 dst8 = vsliq_n_u16(dst8, vshrq_n_u16(dr, 3), 11); 1238 1239 // store it 1240 vst1q_u16(dst, dst8); 1241 1242 dst += UNROLL; 1243 // we don't need to increment src as the asm above has already done it 1244 count -= UNROLL; 1245 x += UNROLL; // probably superfluous 1246 } 1247 } 1248 #undef UNROLL 1249 1250 // residuals 1251 if (count > 0) { 1252 DITHER_565_SCAN(y); 1253 do { 1254 SkPMColor c = *src++; 1255 SkPMColorAssert(c); 1256 SkASSERT(SkGetPackedA32(c) == 255); 1257 1258 unsigned dither = DITHER_VALUE(x); 1259 *dst++ = SkDitherRGB32To565(c, dither); 1260 DITHER_INC_X(x); 1261 } while (--count != 0); 1262 } 1263 } 1264 1265 /////////////////////////////////////////////////////////////////////////////// 1266 1267 const SkBlitRow::Proc16 sk_blitrow_platform_565_procs_arm_neon[] = { 1268 // no dither 1269 S32_D565_Opaque_neon, 1270 S32_D565_Blend_neon, 1271 S32A_D565_Opaque_neon, 1272 #if 0 1273 S32A_D565_Blend_neon, 1274 #else 1275 nullptr, // https://code.google.com/p/skia/issues/detail?id=2797 1276 #endif 1277 1278 // dither 1279 S32_D565_Opaque_Dither_neon, 1280 S32_D565_Blend_Dither_neon, 1281 S32A_D565_Opaque_Dither_neon, 1282 nullptr, // S32A_D565_Blend_Dither 1283 }; 1284 1285 const SkBlitRow::ColorProc16 sk_blitrow_platform_565_colorprocs_arm_neon[] = { 1286 Color32A_D565_neon, // Color32_D565, 1287 Color32A_D565_neon, // Color32A_D565, 1288 Color32A_D565_neon, // Color32_D565_Dither, 1289 Color32A_D565_neon, // Color32A_D565_Dither 1290 }; 1291 1292 const SkBlitRow::Proc32 sk_blitrow_platform_32_procs_arm_neon[] = { 1293 nullptr, // S32_Opaque, 1294 S32_Blend_BlitRow32_neon, // S32_Blend, 1295 nullptr, // Ported to SkOpts 1296 #ifdef SK_CPU_ARM32 1297 S32A_Blend_BlitRow32_neon // S32A_Blend 1298 #else 1299 nullptr 1300 #endif 1301 }; 1302
