1 /* 2 * Copyright 2015 Google Inc. 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 #ifndef Sk4px_DEFINED 9 #define Sk4px_DEFINED 10 11 #include "include/core/SkColor.h" 12 #include "include/private/SkColorData.h" 13 #include "include/private/SkNx.h" 14 15 // This file may be included multiple times by .cpp files with different flags, leading 16 // to different definitions. Usually that doesn't matter because it's all inlined, but 17 // in Debug modes the compilers may not inline everything. So wrap everything in an 18 // anonymous namespace to give each includer their own silo of this code (or the linker 19 // will probably pick one randomly for us, which is rarely correct). 20 namespace { // NOLINT(google-build-namespaces) 21 22 // 1, 2 or 4 SkPMColors, generally vectorized. 23 class Sk4px : public Sk16b { 24 public: Sk4px(const Sk16b & v)25 Sk4px(const Sk16b& v) : INHERITED(v) {} 26 DupPMColor(SkPMColor c)27 static Sk4px DupPMColor(SkPMColor c) { 28 Sk4u splat(c); 29 30 Sk4px v; 31 memcpy((void*)&v, &splat, 16); 32 return v; 33 } 34 35 Sk4px alphas() const; // ARGB argb XYZW xyzw -> AAAA aaaa XXXX xxxx inv()36 Sk4px inv() const { return Sk16b(255) - *this; } 37 38 // When loading or storing fewer than 4 SkPMColors, we use the low lanes. Load4(const SkPMColor px[4])39 static Sk4px Load4(const SkPMColor px[4]) { 40 Sk4px v; 41 memcpy((void*)&v, px, 16); 42 return v; 43 } Load2(const SkPMColor px[2])44 static Sk4px Load2(const SkPMColor px[2]) { 45 Sk4px v; 46 memcpy((void*)&v, px, 8); 47 return v; 48 } Load1(const SkPMColor px[1])49 static Sk4px Load1(const SkPMColor px[1]) { 50 Sk4px v; 51 memcpy((void*)&v, px, 4); 52 return v; 53 } 54 55 // Ditto for Alphas... Load2Alphas fills the low two lanes of Sk4px. 56 static Sk4px Load4Alphas(const SkAlpha[4]); // AaXx -> AAAA aaaa XXXX xxxx 57 static Sk4px Load2Alphas(const SkAlpha[2]); // Aa -> AAAA aaaa ???? ???? 58 store4(SkPMColor px[4])59 void store4(SkPMColor px[4]) const { memcpy(px, this, 16); } store2(SkPMColor px[2])60 void store2(SkPMColor px[2]) const { memcpy(px, this, 8); } store1(SkPMColor px[1])61 void store1(SkPMColor px[1]) const { memcpy(px, this, 4); } 62 63 // 1, 2, or 4 SkPMColors with 16-bit components. 64 // This is most useful as the result of a multiply, e.g. from mulWiden(). 65 class Wide : public Sk16h { 66 public: Wide(const Sk16h & v)67 Wide(const Sk16h& v) : Sk16h(v) {} 68 69 // Add, then pack the top byte of each component back down into 4 SkPMColors. 70 Sk4px addNarrowHi(const Sk16h&) const; 71 72 // Rounds, i.e. (x+127) / 255. 73 Sk4px div255() const; 74 75 // These just keep the types as Wide so the user doesn't have to keep casting. 76 Wide operator * (const Wide& o) const { return INHERITED::operator*(o); } 77 Wide operator + (const Wide& o) const { return INHERITED::operator+(o); } 78 Wide operator - (const Wide& o) const { return INHERITED::operator-(o); } 79 Wide operator >> (int bits) const { return INHERITED::operator>>(bits); } 80 Wide operator << (int bits) const { return INHERITED::operator<<(bits); } 81 82 private: 83 using INHERITED = Sk16h; 84 }; 85 86 Wide widen() const; // Widen 8-bit values to low 8-bits of 16-bit lanes. 87 Wide mulWiden(const Sk16b&) const; // 8-bit x 8-bit -> 16-bit components. 88 89 // The only 8-bit multiply we use is 8-bit x 8-bit -> 16-bit. Might as well make it pithy. 90 Wide operator * (const Sk4px& o) const { return this->mulWiden(o); } 91 92 // These just keep the types as Sk4px so the user doesn't have to keep casting. 93 Sk4px operator + (const Sk4px& o) const { return INHERITED::operator+(o); } 94 Sk4px operator - (const Sk4px& o) const { return INHERITED::operator-(o); } 95 Sk4px operator < (const Sk4px& o) const { return INHERITED::operator<(o); } thenElse(const Sk4px & t,const Sk4px & e)96 Sk4px thenElse(const Sk4px& t, const Sk4px& e) const { return INHERITED::thenElse(t,e); } 97 98 // Generally faster than (*this * o).div255(). 99 // May be incorrect by +-1, but is always exactly correct when *this or o is 0 or 255. approxMulDiv255(const Sk16b & o)100 Sk4px approxMulDiv255(const Sk16b& o) const { 101 // (x*y + x) / 256 meets these criteria. (As of course does (x*y + y) / 256 by symmetry.) 102 // FYI: (x*y + 255) / 256 also meets these criteria. In my brief testing, it was slower. 103 return this->widen().addNarrowHi(*this * o); 104 } 105 106 // A generic driver that maps fn over a src array into a dst array. 107 // fn should take an Sk4px (4 src pixels) and return an Sk4px (4 dst pixels). 108 template <typename Fn> MapSrc(int n,SkPMColor * dst,const SkPMColor * src,const Fn & fn)109 static void MapSrc(int n, SkPMColor* dst, const SkPMColor* src, const Fn& fn) { 110 SkASSERT(dst); 111 SkASSERT(src); 112 // This looks a bit odd, but it helps loop-invariant hoisting across different calls to fn. 113 // Basically, we need to make sure we keep things inside a single loop. 114 while (n > 0) { 115 if (n >= 8) { 116 Sk4px dst0 = fn(Load4(src+0)), 117 dst4 = fn(Load4(src+4)); 118 dst0.store4(dst+0); 119 dst4.store4(dst+4); 120 dst += 8; src += 8; n -= 8; 121 continue; // Keep our stride at 8 pixels as long as possible. 122 } 123 SkASSERT(n <= 7); 124 if (n >= 4) { 125 fn(Load4(src)).store4(dst); 126 dst += 4; src += 4; n -= 4; 127 } 128 if (n >= 2) { 129 fn(Load2(src)).store2(dst); 130 dst += 2; src += 2; n -= 2; 131 } 132 if (n >= 1) { 133 fn(Load1(src)).store1(dst); 134 } 135 break; 136 } 137 } 138 139 // As above, but with dst4' = fn(dst4, src4). 140 template <typename Fn> MapDstSrc(int n,SkPMColor * dst,const SkPMColor * src,const Fn & fn)141 static void MapDstSrc(int n, SkPMColor* dst, const SkPMColor* src, const Fn& fn) { 142 SkASSERT(dst); 143 SkASSERT(src); 144 while (n > 0) { 145 if (n >= 8) { 146 Sk4px dst0 = fn(Load4(dst+0), Load4(src+0)), 147 dst4 = fn(Load4(dst+4), Load4(src+4)); 148 dst0.store4(dst+0); 149 dst4.store4(dst+4); 150 dst += 8; src += 8; n -= 8; 151 continue; // Keep our stride at 8 pixels as long as possible. 152 } 153 SkASSERT(n <= 7); 154 if (n >= 4) { 155 fn(Load4(dst), Load4(src)).store4(dst); 156 dst += 4; src += 4; n -= 4; 157 } 158 if (n >= 2) { 159 fn(Load2(dst), Load2(src)).store2(dst); 160 dst += 2; src += 2; n -= 2; 161 } 162 if (n >= 1) { 163 fn(Load1(dst), Load1(src)).store1(dst); 164 } 165 break; 166 } 167 } 168 169 // As above, but with dst4' = fn(dst4, alpha4). 170 template <typename Fn> MapDstAlpha(int n,SkPMColor * dst,const SkAlpha * a,const Fn & fn)171 static void MapDstAlpha(int n, SkPMColor* dst, const SkAlpha* a, const Fn& fn) { 172 SkASSERT(dst); 173 SkASSERT(a); 174 while (n > 0) { 175 if (n >= 8) { 176 Sk4px dst0 = fn(Load4(dst+0), Load4Alphas(a+0)), 177 dst4 = fn(Load4(dst+4), Load4Alphas(a+4)); 178 dst0.store4(dst+0); 179 dst4.store4(dst+4); 180 dst += 8; a += 8; n -= 8; 181 continue; // Keep our stride at 8 pixels as long as possible. 182 } 183 SkASSERT(n <= 7); 184 if (n >= 4) { 185 fn(Load4(dst), Load4Alphas(a)).store4(dst); 186 dst += 4; a += 4; n -= 4; 187 } 188 if (n >= 2) { 189 fn(Load2(dst), Load2Alphas(a)).store2(dst); 190 dst += 2; a += 2; n -= 2; 191 } 192 if (n >= 1) { 193 fn(Load1(dst), Sk16b(*a)).store1(dst); 194 } 195 break; 196 } 197 } 198 199 // As above, but with dst4' = fn(dst4, src4, alpha4). 200 template <typename Fn> MapDstSrcAlpha(int n,SkPMColor * dst,const SkPMColor * src,const SkAlpha * a,const Fn & fn)201 static void MapDstSrcAlpha(int n, SkPMColor* dst, const SkPMColor* src, const SkAlpha* a, 202 const Fn& fn) { 203 SkASSERT(dst); 204 SkASSERT(src); 205 SkASSERT(a); 206 while (n > 0) { 207 if (n >= 8) { 208 Sk4px dst0 = fn(Load4(dst+0), Load4(src+0), Load4Alphas(a+0)), 209 dst4 = fn(Load4(dst+4), Load4(src+4), Load4Alphas(a+4)); 210 dst0.store4(dst+0); 211 dst4.store4(dst+4); 212 dst += 8; src += 8; a += 8; n -= 8; 213 continue; // Keep our stride at 8 pixels as long as possible. 214 } 215 SkASSERT(n <= 7); 216 if (n >= 4) { 217 fn(Load4(dst), Load4(src), Load4Alphas(a)).store4(dst); 218 dst += 4; src += 4; a += 4; n -= 4; 219 } 220 if (n >= 2) { 221 fn(Load2(dst), Load2(src), Load2Alphas(a)).store2(dst); 222 dst += 2; src += 2; a += 2; n -= 2; 223 } 224 if (n >= 1) { 225 fn(Load1(dst), Load1(src), Sk16b(*a)).store1(dst); 226 } 227 break; 228 } 229 } 230 231 private: 232 Sk4px() = default; 233 234 using INHERITED = Sk16b; 235 }; 236 237 static_assert(sizeof(Sk4px) == sizeof(Sk16b)); 238 static_assert(sizeof(Sk4px) == 16); 239 240 } // namespace 241 242 #ifdef SKNX_NO_SIMD 243 #include "src/opts/Sk4px_none.h" 244 #else 245 #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2 246 #include "src/opts/Sk4px_SSE2.h" 247 #elif defined(SK_ARM_HAS_NEON) 248 #include "src/opts/Sk4px_NEON.h" 249 #else 250 #include "src/opts/Sk4px_none.h" 251 #endif 252 #endif 253 254 #endif//Sk4px_DEFINED 255