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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 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
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