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.
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#' @param render_all If `TRUE` extend the viewport to include the whole webpage (possibly very tall) before rendering.
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#' @return a [magick] image object
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#' @references [Splash docs](http://splash.readthedocs.io/en/stable/index.html)
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#' @inheritParams render_html
#' @export
render_png <- function(
splash_obj = splash_local, url, base_url=NULL, quality=75, width=1024, height=768,
timeout=30, resource_timeout, wait=0, render_all=FALSE,
proxy, js, js_src, filters, allowed_domains, allowed_content_types,
forbidden_content_types, viewport="1024x768", images, headers, body,
http_method, save_args, load_args) {
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params <- list(url=url, timeout=timeout,
wait=if (render_all & wait == 0) 0.5 else wait,
viewport=viewport,
quality=quality, width=width, height=height, render_all=as.numeric(render_all))
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if (!missing(base_url)) params$base_url <- base_url
if (!missing(resource_timeout)) params$resource_timeout <- resource_timeout
if (!missing(proxy)) proxy$base_url <- proxy
if (!missing(js)) params$js <- js
if (!missing(js_src)) params$js_src <- js_src
if (!missing(filters)) params$filters <- filters
if (!missing(allowed_domains)) params$allowed_domains <- allowed_domains
if (!missing(allowed_content_types)) params$allowed_content_types <- allowed_content_types
if (!missing(forbidden_content_types)) params$forbidden_content_types <- forbidden_content_types
if (!missing(images)) params$images <- images
if (!missing(headers)) params$headers <- headers
if (!missing(body)) params$body <- body
if (!missing(http_method)) params$http_method <- http_method
if (!missing(save_args)) params$save_args <- save_args
if (!missing(load_args)) params$load_args <- load_args
res <- httr::GET(splash_url(splash_obj), path="render.png", encode="json", query=params)
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httr::stop_for_status(res)
magick::image_read(httr::content(res, as="raw"))
}