Routines
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24210: Command 1: Skip Tiles
Used by the routine at PopulateRoomBuffer.
Command 1: skip over a number of tile positions without drawing. The following byte specifies how many positions to skip.
Input
DE Tile counter
HL The room data pointer
Command01_SkipTiles 24210 INC HL Increment the room data pointer by one.
24211 LD A,(HL) Fetch the skip count.
24212 INC HL Increment the room data pointer past the skip count byte.
24213 LD B,A Set the skip counter in B.
SkipTiles_Loop 24214 PUSH HL Stash the room data pointer, tile counter and skip counter on the stack.
24215 PUSH DE
24216 PUSH BC
24217 LD D,1 D=1 (flag: advance position only, don't draw).
24219 CALL Draw_Room_Tile Call Draw_Room_Tile.
24222 POP BC Restore the skip counter, tile counter and room data pointer from the stack.
24223 POP DE
24224 POP HL
24225 DEC DE Decrease the tile counter by one.
24226 LD A,E Jump to PopulateRoomBuffer_Error if the tile counter is zero.
24227 OR D
24228 JR Z,PopulateRoomBuffer_Error
24230 DJNZ SkipTiles_Loop Decrease the skip counter by one and loop back to SkipTiles_Loop until all positions are skipped.
24232 JR PopulateRoomBuffer_ParseByte Jump to PopulateRoomBuffer_ParseByte to continue parsing.
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