SkMSec SkTime::GetMSecs()
{
UnsignedWide wide;
Sk64 s;
::Microseconds(&wide);
s.set(wide.hi, wide.lo);
s.div(1000, Sk64::kRound_DivOption);
return s.get32();
}
// Calculates the square of the Euclidian distance to (dx,dy) and stores it in
// *lengthSquared. Returns true if the distance is judged to be "nearly zero".
//
// This logic is encapsulated in a helper method to make it explicit that we
// always perform this check in the same manner, to avoid inconsistencies
// (see http://code.google.com/p/skia/issues/detail?id=560 ).
static inline bool isLengthNearlyZero(SkScalar dx, SkScalar dy,
Sk64 *lengthSquared) {
Sk64 tolSqr;
getLengthSquared(dx, dy, lengthSquared);
// we want nearlyzero^2, but to compute it fast we want to just do a
// 32bit multiply, so we require that it not exceed 31bits. That is true
// if nearlyzero is <= 0xB504, which should be trivial, since usually
// nearlyzero is a very small fixed-point value.
SkASSERT(SK_ScalarNearlyZero <= 0xB504);
tolSqr.set(0, SK_ScalarNearlyZero * SK_ScalarNearlyZero);
return *lengthSquared <= tolSqr;
}
