Class FixedPointMath

Namespace

DocWright.Core.Primitives

Assembly

DocWright.Core.dll

Integer fixed-point arithmetic helpers used by all layout math.

public static class FixedPointMath

Inheritance

object

FixedPointMath

Inherited Members

object.GetType()

object.MemberwiseClone()

object.ToString()

object.Equals(object)

object.Equals(object, object)

object.ReferenceEquals(object, object)

object.GetHashCode()

Remarks

All DocWright layout arithmetic is integer twip arithmetic; floating point is only permitted inside font table parsing and at the renderer output boundary. Rounding is always round-half-away-from-zero, which matches Word's observed behavior when it converts font design units to twips (see the Microsoft OpenType specification for funit scaling: value * pointSize * 20 / unitsPerEm).

All operations are checked: an overflow throws OverflowException rather than silently wrapping, so corrupt documents cannot produce garbage geometry.

Methods

DivRound(long, long)

Divides two 64-bit integers, rounding the quotient half away from zero.

MulDivRound(long, long, long)

Computes value * multiplier / divisor entirely in 64-bit integer arithmetic, rounding the quotient half away from zero.

MulDivRound32(int, int, int)

Computes value * multiplier / divisor in integer arithmetic with round-half-away-from-zero, returning a 32-bit result.

RoundHalfAwayFromZero(double)

Rounds a floating-point value to the nearest 32-bit integer, rounding midpoints away from zero (0.5 becomes 1, -0.5 becomes -1).

RoundHalfAwayFromZeroToInt64(double)

Rounds a floating-point value to the nearest 64-bit integer, rounding midpoints away from zero.