[Rd] raster support in graphics devices

[hadley wickham]

> Just to explain a bit more I am thinking about something like this:
>
> con <- graphicsConnection() # I've just made this up
> png(con)
> plot(1:10)
> dev.off()
> raw.img <- readBin(con, "raw", size = 1, n = 100000000)

It seems to me what you actually want is for graphics devices to
support connections:

rc <- rawConnection("raw.img", "w")
png(rc)
plot(1:10)
dev.off()
close(rc)

Hadley

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