Declarations

function Div255(Value: Word): Word;
function FastDiv255(Value: Word): Word;
function Div255Round(Value: Word): Word;

Overload Details

Overload 1

function Div255(Value: Word): Word;

Fast integer division by 255 for inputs in range [0..$FFFF].

Parameter	Type	Description
Value	Word	16-bit word value to divide by 255 (valid for [0..65535]).

Type	Description
Word	Result of Value div 255.

Overload 2

function FastDiv255(Value: Word): Word;

Ultra-fast integer division by 255 for inputs in range [0..255255].*

Parameter	Type	Description
Value	Word	16-bit word value to divide by 255 (valid for [0..65025]).

Type	Description
Word	Result of Value div 255.

Overload 3

function Div255Round(Value: Word): Word;

Fast rounded integer division by 255 for inputs in range [0..255255].*

Parameter	Type	Description
Value	Word	16-bit word value to divide and round by 255 (valid for [0..65025]).

Type	Description
Word	Rounded result of Round(Value / 255).

Description

Div255, FastDiv255, and Div255Round perform high-speed integer division by 255 without using expensive hardware division instructions. They use reciprocal multiplication and shift magic numbers, making them highly efficient for 8-bit channel blending and alpha scaling.

See also

• Div127