Routines
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7F78: Draw the current location's picture
Used by the routine at DESCRIBE_LOCATION.
Looks the location up in the picture table at PICTURE_TABLE, takes the stream pointer out of the record and runs it. Does nothing at all if the byte at PICTURES_ON is zero: the pictures-off flag, which TITLE_WAIT (TITLE_WAIT) sets from the N key, so holding N there turns every picture off for the game. This is the only test standing between a location change and the whole of the drawing code.
Output
A The value stored at PICTURE_SHOWN, from the table lookup
DRAW_LOCATION_PICTURE 7F78 PUSH AF
7F79 LD A,(PICTURES_ON) PICTURES_ON: nonzero to draw pictures at all (zero if N was held at the title)
7F7C AND A
7F7D JR NZ,DRAW_LOCATION_PICTURE_0
7F7F LD A,$FF
7F81 LD (PICTURE_SHOWN),A
7F84 POP AF
7F85 RET
DRAW_LOCATION_PICTURE_0 7F86 POP AF
7F87 PUSH AF
7F88 PUSH HL
7F89 PUSH BC
7F8A PUSH DE
7F8B PUSH IX
7F8D LD IX,PICTURE_TABLE The picture table, indexed by location
7F91 CALL FIND_RECORD Find this location's record; returns NZ if it has a picture
7F94 LD (PICTURE_SHOWN),A
7F97 LD L,(IX+$01) HL = the stream pointer, from bytes 1 and 2 of the record
7F9A LD H,(IX+$02)
7F9D CALL NZ,RUN_PICTURE Only run the stream if the lookup found a record
7FA0 POP IX
7FA2 POP DE
7FA3 POP BC
7FA4 POP HL
7FA5 POP AF
7FA6 RET
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