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- /*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef Sk4px_DEFINED
- #define Sk4px_DEFINED
- #include "include/core/SkColor.h"
- #include "include/private/SkColorData.h"
- #include "include/private/SkNx.h"
- // This file may be included multiple times by .cpp files with different flags, leading
- // to different definitions. Usually that doesn't matter because it's all inlined, but
- // in Debug modes the compilers may not inline everything. So wrap everything in an
- // anonymous namespace to give each includer their own silo of this code (or the linker
- // will probably pick one randomly for us, which is rarely correct).
- namespace { // NOLINT(google-build-namespaces)
- // 1, 2 or 4 SkPMColors, generally vectorized.
- class Sk4px : public Sk16b {
- public:
- Sk4px(const Sk16b& v) : INHERITED(v) {}
- static Sk4px DupPMColor(SkPMColor c) {
- Sk4u splat(c);
- Sk4px v;
- memcpy(&v, &splat, 16);
- return v;
- }
- Sk4px alphas() const; // ARGB argb XYZW xyzw -> AAAA aaaa XXXX xxxx
- Sk4px inv() const { return Sk16b(255) - *this; }
- // When loading or storing fewer than 4 SkPMColors, we use the low lanes.
- static Sk4px Load4(const SkPMColor px[4]) {
- Sk4px v;
- memcpy(&v, px, 16);
- return v;
- }
- static Sk4px Load2(const SkPMColor px[2]) {
- Sk4px v;
- memcpy(&v, px, 8);
- return v;
- }
- static Sk4px Load1(const SkPMColor px[1]) {
- Sk4px v;
- memcpy(&v, px, 4);
- return v;
- }
- // Ditto for Alphas... Load2Alphas fills the low two lanes of Sk4px.
- static Sk4px Load4Alphas(const SkAlpha[4]); // AaXx -> AAAA aaaa XXXX xxxx
- static Sk4px Load2Alphas(const SkAlpha[2]); // Aa -> AAAA aaaa ???? ????
- void store4(SkPMColor px[4]) const { memcpy(px, this, 16); }
- void store2(SkPMColor px[2]) const { memcpy(px, this, 8); }
- void store1(SkPMColor px[1]) const { memcpy(px, this, 4); }
- // 1, 2, or 4 SkPMColors with 16-bit components.
- // This is most useful as the result of a multiply, e.g. from mulWiden().
- class Wide : public Sk16h {
- public:
- Wide(const Sk16h& v) : Sk16h(v) {}
- // Add, then pack the top byte of each component back down into 4 SkPMColors.
- Sk4px addNarrowHi(const Sk16h&) const;
- // Rounds, i.e. (x+127) / 255.
- Sk4px div255() const;
- // These just keep the types as Wide so the user doesn't have to keep casting.
- Wide operator * (const Wide& o) const { return INHERITED::operator*(o); }
- Wide operator + (const Wide& o) const { return INHERITED::operator+(o); }
- Wide operator - (const Wide& o) const { return INHERITED::operator-(o); }
- Wide operator >> (int bits) const { return INHERITED::operator>>(bits); }
- Wide operator << (int bits) const { return INHERITED::operator<<(bits); }
- private:
- typedef Sk16h INHERITED;
- };
- Wide widen() const; // Widen 8-bit values to low 8-bits of 16-bit lanes.
- Wide mulWiden(const Sk16b&) const; // 8-bit x 8-bit -> 16-bit components.
- // The only 8-bit multiply we use is 8-bit x 8-bit -> 16-bit. Might as well make it pithy.
- Wide operator * (const Sk4px& o) const { return this->mulWiden(o); }
- // These just keep the types as Sk4px so the user doesn't have to keep casting.
- Sk4px operator + (const Sk4px& o) const { return INHERITED::operator+(o); }
- Sk4px operator - (const Sk4px& o) const { return INHERITED::operator-(o); }
- Sk4px operator < (const Sk4px& o) const { return INHERITED::operator<(o); }
- Sk4px thenElse(const Sk4px& t, const Sk4px& e) const { return INHERITED::thenElse(t,e); }
- // Generally faster than (*this * o).div255().
- // May be incorrect by +-1, but is always exactly correct when *this or o is 0 or 255.
- Sk4px approxMulDiv255(const Sk16b& o) const {
- // (x*y + x) / 256 meets these criteria. (As of course does (x*y + y) / 256 by symmetry.)
- // FYI: (x*y + 255) / 256 also meets these criteria. In my brief testing, it was slower.
- return this->widen().addNarrowHi(*this * o);
- }
- // A generic driver that maps fn over a src array into a dst array.
- // fn should take an Sk4px (4 src pixels) and return an Sk4px (4 dst pixels).
- template <typename Fn>
- static void MapSrc(int n, SkPMColor* dst, const SkPMColor* src, const Fn& fn) {
- SkASSERT(dst);
- SkASSERT(src);
- // This looks a bit odd, but it helps loop-invariant hoisting across different calls to fn.
- // Basically, we need to make sure we keep things inside a single loop.
- while (n > 0) {
- if (n >= 8) {
- Sk4px dst0 = fn(Load4(src+0)),
- dst4 = fn(Load4(src+4));
- dst0.store4(dst+0);
- dst4.store4(dst+4);
- dst += 8; src += 8; n -= 8;
- continue; // Keep our stride at 8 pixels as long as possible.
- }
- SkASSERT(n <= 7);
- if (n >= 4) {
- fn(Load4(src)).store4(dst);
- dst += 4; src += 4; n -= 4;
- }
- if (n >= 2) {
- fn(Load2(src)).store2(dst);
- dst += 2; src += 2; n -= 2;
- }
- if (n >= 1) {
- fn(Load1(src)).store1(dst);
- }
- break;
- }
- }
- // As above, but with dst4' = fn(dst4, src4).
- template <typename Fn>
- static void MapDstSrc(int n, SkPMColor* dst, const SkPMColor* src, const Fn& fn) {
- SkASSERT(dst);
- SkASSERT(src);
- while (n > 0) {
- if (n >= 8) {
- Sk4px dst0 = fn(Load4(dst+0), Load4(src+0)),
- dst4 = fn(Load4(dst+4), Load4(src+4));
- dst0.store4(dst+0);
- dst4.store4(dst+4);
- dst += 8; src += 8; n -= 8;
- continue; // Keep our stride at 8 pixels as long as possible.
- }
- SkASSERT(n <= 7);
- if (n >= 4) {
- fn(Load4(dst), Load4(src)).store4(dst);
- dst += 4; src += 4; n -= 4;
- }
- if (n >= 2) {
- fn(Load2(dst), Load2(src)).store2(dst);
- dst += 2; src += 2; n -= 2;
- }
- if (n >= 1) {
- fn(Load1(dst), Load1(src)).store1(dst);
- }
- break;
- }
- }
- // As above, but with dst4' = fn(dst4, alpha4).
- template <typename Fn>
- static void MapDstAlpha(int n, SkPMColor* dst, const SkAlpha* a, const Fn& fn) {
- SkASSERT(dst);
- SkASSERT(a);
- while (n > 0) {
- if (n >= 8) {
- Sk4px dst0 = fn(Load4(dst+0), Load4Alphas(a+0)),
- dst4 = fn(Load4(dst+4), Load4Alphas(a+4));
- dst0.store4(dst+0);
- dst4.store4(dst+4);
- dst += 8; a += 8; n -= 8;
- continue; // Keep our stride at 8 pixels as long as possible.
- }
- SkASSERT(n <= 7);
- if (n >= 4) {
- fn(Load4(dst), Load4Alphas(a)).store4(dst);
- dst += 4; a += 4; n -= 4;
- }
- if (n >= 2) {
- fn(Load2(dst), Load2Alphas(a)).store2(dst);
- dst += 2; a += 2; n -= 2;
- }
- if (n >= 1) {
- fn(Load1(dst), Sk16b(*a)).store1(dst);
- }
- break;
- }
- }
- // As above, but with dst4' = fn(dst4, src4, alpha4).
- template <typename Fn>
- static void MapDstSrcAlpha(int n, SkPMColor* dst, const SkPMColor* src, const SkAlpha* a,
- const Fn& fn) {
- SkASSERT(dst);
- SkASSERT(src);
- SkASSERT(a);
- while (n > 0) {
- if (n >= 8) {
- Sk4px dst0 = fn(Load4(dst+0), Load4(src+0), Load4Alphas(a+0)),
- dst4 = fn(Load4(dst+4), Load4(src+4), Load4Alphas(a+4));
- dst0.store4(dst+0);
- dst4.store4(dst+4);
- dst += 8; src += 8; a += 8; n -= 8;
- continue; // Keep our stride at 8 pixels as long as possible.
- }
- SkASSERT(n <= 7);
- if (n >= 4) {
- fn(Load4(dst), Load4(src), Load4Alphas(a)).store4(dst);
- dst += 4; src += 4; a += 4; n -= 4;
- }
- if (n >= 2) {
- fn(Load2(dst), Load2(src), Load2Alphas(a)).store2(dst);
- dst += 2; src += 2; a += 2; n -= 2;
- }
- if (n >= 1) {
- fn(Load1(dst), Load1(src), Sk16b(*a)).store1(dst);
- }
- break;
- }
- }
- private:
- Sk4px() = default;
- typedef Sk16b INHERITED;
- };
- } // namespace
- #ifdef SKNX_NO_SIMD
- #include "src/opts/Sk4px_none.h"
- #else
- #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
- #include "src/opts/Sk4px_SSE2.h"
- #elif defined(SK_ARM_HAS_NEON)
- #include "src/opts/Sk4px_NEON.h"
- #else
- #include "src/opts/Sk4px_none.h"
- #endif
- #endif
- #endif//Sk4px_DEFINED
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