alpha混合

Dst.Red    = Src.Red   * alpha + (1-alpha) * Dst.Red  ;

Dst.Green  = Src.Green * alpha + (1-alpha) * Dst.Green;

Dst.Blue   = Src.Blue  * alpha + (1-alpha) * Dst.Blue ;

Dst.Alpha  = Src.Alpha * alpha + (1-alpha) * Dst.Alpha;

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