FAQ

On Tue, Jun 16, 2015 at 5:46 AM, chai2010 wrote:
does it same as:

pyrDownRGBA(
lena256x256, lena256x256.Bounds(),
lena512x512.(*image.RGBA), image.Pt(0, 0),
)
I only skimmed your code, but I guess it'd do the same, after you
change draw.Over to draw.Src. It should be easy enough to check: just
fill your source image with random noise and see if you get identical
output.

2. i found some invalid code in impl.go, does it a mistake?

https://github.com/golang/image/blob/master/draw/impl.go#L1274
How is it invalid?

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