Given an RGBA encoded number, returns back the RGBA number with it's alpha
component multiplied by the passed alpha parameter.
Parameters
rgba: number
RGBA encoded number
alpha: number
Normalized alpha value (Range: 0.0 - 1.0)
Returns number
Internal Remarks
This method does NOT premultiply the alpha into the color channels. If that
is required (for internal use only) use mergeColorAlphaPremultiplied
instead.
Given an RGBA encoded number, returns back the RGBA number with it's alpha component multiplied by the passed
alphaparameter.