Routines
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D41E: Next background in the room's list
Used by the routine at next_bg_obj_sprite.
The room record starts with a list of background numbers, ended by $FF. Each one is looked up in background_type_tbl to find its list of templates.
Input
HL the next byte of the room record
DE the next free object record
B the bytes left in the room record
next_bg_obj D41E LD A,(HL) $FF ends the backgrounds and starts the foreground list
D41F INC HL
D420 CP $FF
D422 JR Z,find_fg_objs
D424 PUSH BC look the background up in background_type_tbl; HL = its template list
D425 PUSH HL
D426 LD L,A
D427 LD H,$00
D429 ADD HL,HL
D42A LD BC,background_type_tbl
D42D ADD HL,BC
D42E LD A,(HL)
D42F INC HL
D430 LD H,(HL)
D431 LD L,A
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