Is there image preload?

[Yoposoc]

Can a preload of the images be implemented somehow? They take quite a while to load.

[beppe9000]

It's there, just not working properly it seems.

GelbooruEnhancement/GelbooruImageViewer.user.js

Lines 195 to 200 in 0f72e24

	preload() {
	if (site.sankakucomplex) return;
	const curr = $.current();
	Main.req($.find(curr, true));
	Main.req($.find(curr, false));
	},

GelbooruEnhancement/GelbooruImageViewer.user.js

Lines 1213 to 1231 in 0f72e24

	async req(node) {
	if (!node) return;
	const { dataset } = node;
	if (dataset.alreadyLoading || dataset.full !== "loading") return;
	const { 0: id, 1: api } = Main.getApiInfo(node);
	dataset.alreadyLoading = "true";
	try {
	if (site.sankakucomplex) return await Prog.fn(api + id, id, node);
	const request = await fetch(api + id);
	const text = await Main.processHttp(request);
	Main.processText(text, node, id);
	}
	catch (e) {
	Main.warn();
	$("img", node).style.outline = "6px solid red";
	console.error(`Main.req failure:\n\n${location.origin + api + id} |`, e);
	node.removeAttribute("data-already-loading");
	}
	},

If there was a way to bypass the CORS policy something like this to explicitly put urls in cache would probably work for firefox:

caches.open('cache1').then(function(cache) {return cache.add("full-size image url");})

Yet I'm not sure where the lag I see comes from. Is it downloading again, or is just lag from loading the blob in the data tag of the image?

If the lag is from actually loading the blob, maybe the gallery can be changed so that all the images are loaded at first in their own img tag and navigation is done by setting css display:none to all the images except the current one.

[Yoposoc]

Sorry, just saw this.

So.... I'm unclear what I should try? How can I help you get preloading working?

[beppe9000]

Basically it's bugged due to browser updates. If you can, you could implement the alterations to the loading mechanism to show the images from the src tag and update that with the full res url before showing the next pic in the gallery instead of default preloading logic. I have not much experience with userscript api....

[beppe9000]

Technically the img solution works. I tried to implement a fix (with r34xxx in mind) but I have no idea how to get the proper full-size file extension without downloading the pages. For example thumbnail is jpg but full-size can be gif, png, jpg ,jpeg, ...