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A general description is here.
The ‘windows()’ family of devices now supports() per-pixel alpha for
raster images.
There is support for cairographics-based devices using the same code as on Unix-alikes. This can be selected by the new ‘type’ argument of the bitmap devices ‘bmp()’, ‘jpeg()’, ‘png()’ and ‘tiff()’. New devices ‘svg()’, ‘cairo_pdf()’ and ‘cairo_ps()’ are available.
[Experimental and not compiled in by default (and not all devices yet work correctly).
To experiment with them, follow the instructions in the ‘R Installation and Administration Manual’.]
The ‘windows()’ family of devices now supports() per-pixel alpha for raster images.
Shutting down the R session cleaned up the temporary directory before closing all graphics devices. On Windows this necessitated changing the working directory, so some devices (e.g. ‘tiff()’) could write files in the wrong directory. The order has been reversed.
‘file.info()’ now accepts ‘file’ names with trailing directory separators, even though such names are invalid on Windows.