int PackBytes(int byte1, int byte2, int byte3, int byte4)

Packs four bytes into one integer and returns the result. The bytes must be in the [0, 255] range.

The packed values can be retrieved using UnpackByteX.

int packed = PackBytes(10, 11, 12, 13);
UnpackByte1(packed) -> 10
UnpackByte2(packed) -> 11
UnpackByte3(packed) -> 12
UnpackByte4(packed) -> 13

Passing a color to a script:

function void SomeFunction(void)
{
    // red, green, blue, alpha
    int color = PackBytes(255, 128, 0, 128); 
    ACS_ExecuteAlways(somescript, 0, x, y, color);
}

script somescript (int x, int y, int color)
{
    int r = UnpackByte1(color);
    int g = UnpackByte2(color);
    int b = UnpackByte3(color);
    int a = UnpackByte4(color);
}