Routines
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B8E2: Convert Entity Position
Used by the routines at BuildDrawList and PrepareEntityItem.
Converts the screen position in fields 0E and 0F of an entity, which is limited to 7F in the high byte, to an address in the screen buffer with GetBufferAddress, and stores the address in fields 18 and 19.
Input
IX The entity
ConvertEntityPosition B8E2 LD H,(IX+$0F) Fetch the row into H.
B8E5 LD L,(IX+$0E) Fetch the column into L.
B8E8 LD A,H H moves into A.
B8E9 CP $80 Jump to B8EF if it is below 80.
B8EB JR C,ConvertEntityPosition_Skip
B8ED LD H,$7F H is 7F.
ConvertEntityPosition_Skip B8EF CALL GetBufferAddress Call GetBufferAddress.
B8F2 LD (IX+$18),L Write L in field 18 of the entity.
B8F5 LD (IX+$19),H Write H in field 19 of the entity.
B8F8 RET Return.
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