Nothing
#' Display a specific image output
#'
#' Either \code{data} or \code{file} must be passed.
#'
#' @param data The data as a \code{\link[base]{raw}} vector (\code{\link[base]{character}} vector for \code{display_svg})
#' @param file The path to a file or a \code{\link[base]{connection}} containing the content
#' @param width The width to display the image
#' @param height The height to display the image
#'
#' @seealso \code{\link{display_<text>}}
#'
#' @examples \dontrun{## (Run inside of an IRkernel)
#' display_png(file = 'image.png')
#' display_svg('
#' <svg xmlns="http://www.w3.org/2000/svg" viewBox="-1 -1 2 2">
#' <circle r="1"/>
#' </svg>
#' ')
#' display_jpeg(file = url('https://dummyimage.com/600x400.jpg', 'wb'), width = 100)}
#'
#' @name display_<image>
#' @rdname display-images
NULL
#' @rdname display-images
#' @export
display_png <- function(data = NULL, file = NULL, width = NULL, height = NULL)
display_img('image/png', TRUE, data, file, width, height)
#' @rdname display-images
#' @export
display_jpeg <- function(data = NULL, file = NULL, width = NULL, height = NULL)
display_img('image/jpeg', TRUE, data, file, width, height)
#' @rdname display-images
#' @export
display_pdf <- function(data = NULL, file = NULL, width = NULL, height = NULL)
display_img('application/pdf', TRUE, data, file, width, height)
#' @rdname display-images
#' @export
display_svg <- function(data = NULL, file = NULL, width = NULL, height = NULL)
display_img('image/svg+xml', FALSE, data, file, width, height)
display_img <- function(mime, binary, data, file, width, height)
display_raw(mime, binary, data, file, img_metadata(mime, width, height))
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