toShapeColor
Returns this Compose Color as the equivalent ShapeColor.
The conversion goes through the color's packed ARGB form: a color in a non-sRGB working space converts to sRGB, and each channel rounds to the nearest 8-bit value. For sRGB colors built from integer channels the round-trip with toComposeColor is exact.
Receiver
The Compose color to bridge.
Return
The matching packed ShapeColor.