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## TODO: write R functions to import jpgs and pngs if Img tcl extension could not be loaded
#' @title Import Image Files as Tk Image Objects
#'
#' @description Note that the supported image file formats depend on whether the
#' \code{Img} Tk extension is installed.
#'
#' @param paths vector with paths to image files that are supported
#'
#' @templateVar page learn_R_display_plot
#' @templateVar section load-images
#' @template see_l_help
#'
#'
#' @return vector of image object names
#'
#' @seealso \code{\link{l_image_import_array}}, \code{\link{l_imageviewer}}
#'
#' @export
l_image_import_files <- function(paths) {
if (!.withTclImg) {
if (any(vapply(paths, function(p) {
!(toupper(tools::file_ext(p)) %in% c("PPM", "PGM", "PNG", "GIF"))
}, logical(1)))) {
stop("All file formats other than png require the IMG Tcl extension.")
}
}
unique_paths <- unique(paths)
unique_ids <- sapply(unique_paths, function(path) {
tclvalue(tkimage.create('photo', file = path))
})
ii <- match(paths,unique_paths)
return(unique_ids[ii])
}
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