| /* |
| * 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 SkPx_none_DEFINED |
| #define SkPx_none_DEFINED |
| |
| // Nothing fancy here. We're the backup _none case after all. |
| // Our declared sweet spot is simply a single pixel at a time. |
| |
| namespace none { |
| |
| struct SkPx { |
| static const int N = 1; |
| uint8_t f8[4]; |
| |
| SkPx(uint32_t px) { memcpy(f8, &px, 4); } |
| SkPx(uint8_t x, uint8_t y, uint8_t z, uint8_t a) { |
| f8[0] = x; f8[1] = y; f8[2] = z; f8[3] = a; |
| } |
| |
| static SkPx Dup(uint32_t px) { return px; } |
| static SkPx Load(const uint32_t* px) { return *px; } |
| static SkPx Load(const uint32_t* px, int n) { |
| SkASSERT(false); // There are no 0<n<1. |
| return 0; |
| } |
| |
| void store(uint32_t* px) const { memcpy(px, f8, 4); } |
| void store(uint32_t* px, int n) const { |
| SkASSERT(false); // There are no 0<n<1. |
| } |
| |
| struct Alpha { |
| uint8_t fA; |
| Alpha(uint8_t a) : fA(a) {} |
| |
| static Alpha Dup(uint8_t a) { return a; } |
| static Alpha Load(const uint8_t* a) { return *a; } |
| static Alpha Load(const uint8_t* a, int n) { |
| SkASSERT(false); // There are no 0<n<1. |
| return 0; |
| } |
| Alpha inv() const { return 255 - fA; } |
| }; |
| |
| struct Wide { |
| uint16_t f16[4]; |
| |
| Wide(uint16_t x, uint16_t y, uint16_t z, uint16_t a) { |
| f16[0] = x; f16[1] = y; f16[2] = z; f16[3] = a; |
| } |
| |
| Wide operator+(const Wide& o) const { |
| return Wide(f16[0]+o.f16[0], f16[1]+o.f16[1], f16[2]+o.f16[2], f16[3]+o.f16[3]); |
| } |
| Wide operator-(const Wide& o) const { |
| return Wide(f16[0]-o.f16[0], f16[1]-o.f16[1], f16[2]-o.f16[2], f16[3]-o.f16[3]); |
| } |
| template <int bits> Wide shl() const { |
| return Wide(f16[0]<<bits, f16[1]<<bits, f16[2]<<bits, f16[3]<<bits); |
| } |
| template <int bits> Wide shr() const { |
| return Wide(f16[0]>>bits, f16[1]>>bits, f16[2]>>bits, f16[3]>>bits); |
| } |
| |
| SkPx addNarrowHi(const SkPx& o) const { |
| Wide sum = (*this + o.widenLo()).shr<8>(); |
| return SkPx(sum.f16[0], sum.f16[1], sum.f16[2], sum.f16[3]); |
| } |
| }; |
| |
| Alpha alpha() const { return f8[3]; } |
| |
| Wide widenLo() const { return Wide(f8[0], f8[1], f8[2], f8[3]); } |
| Wide widenHi() const { return this->widenLo().shl<8>(); } |
| Wide widenLoHi() const { return this->widenLo() + this->widenHi(); } |
| |
| SkPx operator+(const SkPx& o) const { |
| return SkPx(f8[0]+o.f8[0], f8[1]+o.f8[1], f8[2]+o.f8[2], f8[3]+o.f8[3]); |
| } |
| SkPx operator-(const SkPx& o) const { |
| return SkPx(f8[0]-o.f8[0], f8[1]-o.f8[1], f8[2]-o.f8[2], f8[3]-o.f8[3]); |
| } |
| SkPx saturatedAdd(const SkPx& o) const { |
| return SkPx(SkTMax(0, SkTMin(255, f8[0]+o.f8[0])), |
| SkTMax(0, SkTMin(255, f8[1]+o.f8[1])), |
| SkTMax(0, SkTMin(255, f8[2]+o.f8[2])), |
| SkTMax(0, SkTMin(255, f8[3]+o.f8[3]))); |
| } |
| |
| Wide operator*(const Alpha& a) const { |
| return Wide(f8[0]*a.fA, f8[1]*a.fA, f8[2]*a.fA, f8[3]*a.fA); |
| } |
| SkPx approxMulDiv255(const Alpha& a) const { |
| return (*this * a).addNarrowHi(*this); |
| } |
| |
| SkPx addAlpha(const Alpha& a) const { |
| return SkPx(f8[0], f8[1], f8[2], f8[3]+a.fA); |
| } |
| }; |
| |
| } // namespace none |
| |
| typedef none::SkPx SkPx; |
| |
| #endif//SkPx_none_DEFINED |