Gradient filling problem

[zhangyouyuan]

1.Radial gradient cannot be transformed 2.examples/gradient-linear.go grad.AddColorStop(0, color.RGBA{0, 255, 0, 255}) to grad.AddColorStop(0, color.RGBA{0, 255, 0, 0}) color.RGBA.A !=255 has a problem

[fogleman]

#2 is because the alpha is premultiplied.