How to mix two ARGB pixels?

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Taken from the same Wikipedia article where you got the image:

C_o = C_a \alpha_a + C_b \alpha_b \left(1 - \alpha_a\right)

Translating to values which range from 0 to 255:

rOut = (rA * aA / 255) + (rB * aB * (255 - aA) / (255*255))
gOut = (gA * aA / 255) + (gB * aB * (255 - aA) / (255*255))
bOut = (bA * aA / 255) + (bB * aB * (255 - aA) / (255*255))
aOut = aA + (aB * (255 - aA) / 255)

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