Invert the colours of an SVG file — invert

Build a dark-mode variant of an SVG image by replacing every colour with its RGB complement. Both the hexadecimal notation used by svglite and the rgb() notation written by cairo-based devices such as grDevices::svg() are understood. Elements that do not set their own fill would keep the SVG default black, so default_fill is written on the root <svg> element, where those elements inherit it.

Usage

invert_svg(
  path,
  output = NULL,
  default_fill = "#ffffff",
  invert_raster = TRUE,
  quiet = FALSE
)

Arguments

path: Path to the input SVG file.
output: Path of the output SVG. Defaults to the input name with a -dark suffix next to it. Use NA to return the modified SVG as a string without writing a file.
default_fill: Fill written on the root <svg> element, so elements without their own fill do not stay black. Use NULL to leave the root element untouched.
invert_raster: Whether to complement the colours of embedded raster images as well. Default is TRUE. Requires the png package.
quiet: Whether to suppress the message about the written file. Default is FALSE.

Value

The output path, invisibly, or the modified SVG as a string when output is NA.