server
but when you compile through cmake it's going to out/build/etcCMapItemImage
in src/game/mapitems.h
CMapItemImage
thing this might help:
https://github.com/teeworlds/teeworlds/commit/21793da2053346d5d795df967bad8d50be5697c5m_Format
field was added so the client can handle 24 bit RGB texturesmapitems.h