In the golang color package, there is a method to get r,g,b,a values from an RGBA
object:
func (c RGBA) RGBA() (r, g, b, a uint32) {
r = uint32(c.R)
r |= r << 8
g = uint32(c.G)
g |= g << 8
b = uint32(c.B)
b |= b << 8
a = uint32(c.A)
a |= a << 8
return
}
If I were to implement this simple function, I would just write this
func (c RGBA) RGBA() (r, g, b, a uint32) {
r = uint32(c.R)
g = uint32(c.G)
b = uint32(c.B)
a = uint32(c.A)
return
}
What's the reason r |= r << 8
is used?