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Aliceee2chandGitHub c7408ce841 Mapping previews tool for mapper's mapping needs (#96872)
## About The Pull Request

Makes more machinery using MAP_SWITCHes so their fancy preview icons
could be displayed in SDMM. MAP_SWITCH takes original icon+icon_state of
machinery as first argument and icon+icon_state (basically a machinery
part because the naming system, like `MAP_SWITCH("computer",
"/obj/machinery/computer/slot_machine")` ) from
icons/obj/fluff/map_previews.dmi

Adds a tool (subsystem) for that need that generates preview icons for
stuff that has overlays. To include them in preview generating you have
to set specific variable to TRUE.


## Why It's Good For The Game

Lets us do this instead of black boring consoles: 
(before)
<img width="641" height="575" alt="image"
src="https://github.com/user-attachments/assets/35fc5a19-bc24-4c02-957a-43ddef86e684"
/>
(after)
<img width="641" height="575" alt="image"
src="https://github.com/user-attachments/assets/99310823-747f-4e0a-acf8-60abcc8f2ed1"
/>


## Changelog

🆑
qol: Made machinery with overlays actually be properly displayed in SDMM
editor.
/🆑
2026-07-15 12:48:22 +00:00

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SUBSYSTEM_DEF(map_previews)
name = "Map Previews"
ss_flags = SS_NO_FIRE
dependencies = list(
/datum/controller/subsystem/machines,
/datum/controller/subsystem/mapping,
)
/datum/controller/subsystem/map_previews/Initialize()
#ifndef UNIT_TESTS
if(!CONFIG_GET(flag/generate_assets_in_init))
return SS_INIT_SUCCESS
#endif
generate_map_previews()
return SS_INIT_SUCCESS
/datum/controller/subsystem/map_previews/proc/generate_map_previews()
var/list/worklist = list()
var/list/already_generated = list()
var/static/list/preview_blacklist = list(
/obj/machinery/computer,
/obj/machinery/computer/old,
)
for(var/obj/typepath as anything in subtypesof(/obj))
if(!initial(typepath.generate_map_preview))
continue
if(typepath in preview_blacklist)
continue
worklist += typepath
var/turf/preview_turf = locate(1, 1, 1)
var/filepath = "icons/obj/fluff/map_previews.dmi"
var/icon/holder = icon('icons/obj/fluff/map_previews_template.dmi')
for(var/path in worklist)
var/obj/thingtospawn = new path(preview_turf)
if(ismachinery(thingtospawn))
var/obj/machinery/machine = thingtospawn
machine.set_machine_stat(machine.machine_stat & ~NOPOWER)
machine.update_appearance()
var/key = "[thingtospawn.icon]-[thingtospawn.icon_state]"
for(var/image/overlay as anything in thingtospawn.overlays)
key += "-[overlay.icon_state]"
if(already_generated[key])
qdel(thingtospawn)
continue
already_generated[key] = TRUE
var/icon_name = "[path]"
for(var/dir in GLOB.cardinals)
thingtospawn.setDir(dir)
var/icon/rendered_icon = getFlatIcon(thingtospawn)
if(!rendered_icon)
continue
var/icon/preview_frame = icon(rendered_icon, frame = 1)
if(!preview_frame)
continue
#ifdef UNIT_TESTS
if(preview_frame.Width() > ICON_SIZE_X || preview_frame.Height() > ICON_SIZE_Y)
stack_trace("Map preview generation for '[icon_name]' produced an icon larger than 32x32.")
continue
#endif
holder.Insert(preview_frame, icon_name, dir)
qdel(thingtospawn)
var/tmp_path = "tmp/map_previews.dmi"
fcopy(holder, tmp_path)
var/old_md5 = fexists(filepath) ? rustg_hash_file(RUSTG_HASH_MD5, filepath) : ""
var/new_md5 = rustg_hash_file(RUSTG_HASH_MD5, tmp_path)
if(old_md5 != new_md5)
fcopy(tmp_path, filepath)
#ifdef UNIT_TESTS
stack_trace("Generated map previews were different than what is currently saved. If you see this in a CI run it means you need to run the game once through initialization and commit the resulting file 'icons/obj/fluff/map_previews.dmi'.")
#endif