Tools to Work with the 'Splash' JavaScript Rendering Service in R
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#' Return a image (in PNG format) of the javascript-rendered page.
#' @md
#' @param width,height Resize the rendered image to the given width/height (in pixels) keeping the aspect ratio. These are optional
#' @param render_all If `TRUE` extend the viewport to include the whole webpage (possibly very tall) before rendering.
#' @family splash_renderers
#' @return a [magick] image object
#' @references [Splash docs](
#' @inheritParams render_html
#' @export
#' @examples \dontrun{
#' render_png(url = "")
#' }
render_png <- function(
splash_obj = splash_local, url, base_url=NULL, width, height,
timeout=30, resource_timeout, wait=0, render_all=TRUE,
proxy, js, js_src, filters, allowed_domains, allowed_content_types,
forbidden_content_types, viewport="full", images, headers, body,
http_method, save_args, load_args) {
wait <- check_wait(wait)
params <- list(url=url, timeout=timeout,
wait=if (render_all & wait == 0) 0.5 else wait,
if (!missing(width)) params$width <- width
if (!missing(height)) params$height <- height
if (!missing(base_url)) params$base_url <- jsonlite::unbox(base_url)
if (!missing(resource_timeout)) params$resource_timeout <- resource_timeout
if (!missing(proxy)) params$proxy <- jsonlite::unbox(proxy)
if (!missing(js)) params$js <- jsonlite::unbox(js)
if (!missing(js_src)) params$js_src <- jsonlite::unbox(js_src)
if (!missing(filters)) params$filters <- jsonlite::unbox(filters)
if (!missing(allowed_domains)) params$allowed_domains <- jsonlite::unbox(allowed_domains)
if (!missing(allowed_content_types)) params$allowed_content_types <- jsonlite::unbox(allowed_content_types)
if (!missing(forbidden_content_types)) params$forbidden_content_types <- jsonlite::unbox(forbidden_content_types)
if (!missing(images)) params$images <- as.numeric(images)
if (!missing(headers)) params$headers <- headers
if (!missing(body)) params$body <- jsonlite::unbox(body)
if (!missing(http_method)) params$http_method <- jsonlite::unbox(http_method)
if (!missing(save_args)) params$save_args <- jsonlite::unbox(save_args)
if (!missing(load_args)) params$load_args <- jsonlite::unbox(load_args)
res <- httr::GET(splash_url(splash_obj), path="render.png", encode="json", query=params)
magick::image_read(httr::content(res, as="raw"))