pokered/engine/overworld/is_player_just_outside_map.asm

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; returns whether the player is one tile outside the map in Z
IsPlayerJustOutsideMap: ; 128d8 (4:68d8)
ld a, [W_YCOORD]
ld b, a
ld a, [W_CURMAPHEIGHT]
call .compareCoordWithMapDimension
ret z
ld a, [W_XCOORD]
ld b, a
ld a, [W_CURMAPWIDTH]
.compareCoordWithMapDimension
add a
cp b
ret z
inc b
ret