Routines
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D3F0: Take the room's colour and size from its record
Used by the routine at find_screen.
The byte after the length is the room's attribute byte. Its bits 0 to 2 are the ink colour the whole room is drawn in, and its bits 3 to 7 pick one of the entries in room_size_tbl, which give the room's half-widths in x and y and the height of its floor. After this B counts the bytes that remain in the record, so that the lists that follow can end on it as well as on their own markers.
Input
HL the record's length byte
found_screen D3F0 LD B,(HL) B = the record's length; HL on the attribute byte
D3F1 INC HL
D3F2 LD A,(HL) ink colour, BRIGHT, black paper: kept in $5BAD for fill_attr to paint the room with
D3F3 AND $07
D3F5 OR $40
D3F7 LD ($5BAD),A
D3FA PUSH DE bits 3 to 7 index the size table
D3FB EX DE,HL
D3FC LD A,(DE)
D3FD INC DE
D3FE RRCA
D3FF RRCA
D400 RRCA
D401 AND $1F
D403 LD C,A three bytes an entry in room_size_tbl
D404 ADD A,A
D405 ADD A,C
D406 LD HL,room_size_tbl
D409 CALL add_HL_A
D40C LD A,(HL) half-width in x into $5BAB, in y into $5BAC, and the floor height into $5BAE
D40D INC HL
D40E LD ($5BAB),A
D411 LD A,(HL)
D412 INC HL
D413 LD ($5BAC),A
D416 LD A,(HL)
D417 LD ($5BAE),A
D41A DEC B the length counted itself and the attribute byte; HL on the list of backgrounds, DE on the next free record again
D41B DEC B
D41C EX DE,HL
D41D POP DE
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