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inline SkPMFloat& SkPMFloat::operator=(const SkPMFloat& that) {
fColors = that.fColors;
return *this;
}
// For SkPMFloat(SkPMFColor), we widen our 8 bit components (fix8) to 8-bit components in 16 bits
// (fix8_16), then widen those to 8-bit-in-32-bits (fix8_32), and finally convert those to floats.
// get() and clamped() do the opposite, working from floats to 8-bit-in-32-bit,
// to 8-bit-in-16-bit, back down to 8-bit components.
// clamped() uses vqmovn to clamp while narrowing instead of just narrowing with vmovn.
inline SkPMFloat::SkPMFloat(SkPMColor c) {
SkPMColorAssert(c);
uint8x8_t fix8 = (uint8x8_t)vdup_n_u32(c);
uint16x8_t fix8_16 = vmovl_u8(fix8);
uint32x4_t fix8_32 = vmovl_u16(vget_low_u16(fix8_16));
fColors = vcvtq_f32_u32(fix8_32);
SkASSERT(this->isValid());
}
inline SkPMColor SkPMFloat::get() const {
SkASSERT(this->isValid());
float32x4_t add_half = vaddq_f32(fColors, vdupq_n_f32(0.5f));
uint32x4_t fix8_32 = vcvtq_u32_f32(add_half); // vcvtq_u32_f32 truncates, so round manually
uint16x4_t fix8_16 = vmovn_u32(fix8_32);
uint8x8_t fix8 = vmovn_u16(vcombine_u16(fix8_16, vdup_n_u16(0)));
SkPMColor c = vget_lane_u32((uint32x2_t)fix8, 0);
SkPMColorAssert(c);
return c;
}
inline SkPMColor SkPMFloat::clamped() const {
float32x4_t add_half = vaddq_f32(fColors, vdupq_n_f32(0.5f));
uint32x4_t fix8_32 = vcvtq_u32_f32(add_half); // vcvtq_u32_f32 truncates, so round manually
uint16x4_t fix8_16 = vqmovn_u32(fix8_32);
uint8x8_t fix8 = vqmovn_u16(vcombine_u16(fix8_16, vdup_n_u16(0)));
SkPMColor c = vget_lane_u32((uint32x2_t)fix8, 0);
SkPMColorAssert(c);
return c;
}
// TODO: we should be able to beat these loops on all three methods.
inline void SkPMFloat::From4PMColors(SkPMFloat floats[4], const SkPMColor colors[4]) {
for (int i = 0; i < 4; i++) { floats[i] = FromPMColor(colors[i]); }
}
inline void SkPMFloat::To4PMColors(SkPMColor colors[4], const SkPMFloat floats[4]) {
for (int i = 0; i < 4; i++) { colors[i] = floats[i].get(); }
}
inline void SkPMFloat::ClampTo4PMColors(SkPMColor colors[4], const SkPMFloat floats[4]) {
for (int i = 0; i < 4; i++) { colors[i] = floats[i].clamped(); }
}
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