Save the current page of a cairo
X11() device to a file.
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filename to save to.
file type: only
the device to save from.
X11 devices are supported.
This works by copying the image surface to a file. For PNG will always be a 24-bit per pixel PNG ‘DirectClass’ file, for JPEG the quality is 75% and for TIFF there is no compression.
For devices with buffering this copies the buffer's image surface, so
works even if
dev.hold has been called.
At present the plot is saved after rendering onto the canvas (default
opaque white), so for the default
bg = "transparent" the
effective background colour is the canvas colour.
There is a similar function of the same name but more types for
windows devices on Windows.
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