4437bb5ebf
## About The Pull Request Adds a check for icon state existence in spritesheet insert, run during unit tests. ## Why It's Good For The Game Inserting a nonexistent icon state via `Insert()` will corrupt the spritesheet it's inserted to, resulting in offsets being incorrect—specifically, it results in the entire icon's contents being inserted. This happened downstream on Doppler Shift and broke language icons. I fixed the issue there but figured that there should be a check upstream for it. `if (!I || !length(icon_states(I))) // that direction or state doesn't exist)` This check doesn't catch it, by the way. Since it returns the entire icon file, `length(icon_states(I))` is >0. You could do `length(icon_states) != 1`, but then it still wouldn't catch cases where there's a single-icon-state icon *and* the icon_state is invalid. Boo. A test like this is the best option. I tried using the rust-g variant of icon_states and sort-of got it working, but I figured it'd be too fragile to justify given that it doesn't accept actual icon instances, only paths.
Asset cache system
Framework for managing browser assets (javascript,css,images,etc)
This manages getting the asset to the client without doing unneeded re-sends, as well as utilizing any configured cdns.
There are two frameworks for using this system:
Asset datum:
Make a datum in asset_list_items.dm with your browser assets for your thing.
Checkout asset_list.dm for the helper subclasses
The simple subclass will most likely be of use for most cases.
Call get_asset_datum() with the type of the datum you created to get your asset cache datum
Call .send(client|usr) on that datum to send the asset to the client. Depending on the asset transport this may or may not block.
Call .get_url_mappings() to get an associated list with the urls your assets can be found at.
Manual backend:
See the documentation for /datum/asset_transport for the backend api the asset datums utilize.
The global variable SSassets.transport contains the currently configured transport.
Notes:
Because byond browse() calls use non-blocking queues, if your code uses output() (which bypasses all of these queues) to invoke javascript functions you will need to first have the javascript announce to the server it has loaded before trying to invoke js functions.
To make your code work with any CDNs configured by the server, you must make sure assets are referenced from the url returned by get_url_mappings() or by asset_transport's get_asset_url(). (TGUI also has helpers for this.) If this can not be easily done, you can bypass the cdn using legacy assets, see the simple asset datum for details.
CSS files that use url() can be made to use the CDN without needing to rewrite all url() calls in code by using the namespaced helper datum. See the documentation for /datum/asset/simple/namespaced for details.