Routines
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92E2: Copy Reveal Line
Used by the routine at ProcessRevealLine.
Input
DE Screen position
CopyRevealLine 92E2 PUSH DE Stash the screen position on the stack.
On return from CalculateDartBoardAddress HL will contain the dart board graphic destination (i.e. DartBoard onwards).
92E3 CALL CalculateDartBoardAddress Call CalculateDartBoardAddress.
Set up the source and destination addresses.
92E6 LD D,H Copy the dart board graphic location from HL into DE.
92E7 LD E,L
92E8 LD A,H H-=20.
92E9 SUB $20
92EB LD H,A
Copy 08 pixel rows that make up one character cell of the dartboard.
92EC LD B,$08 Set a counter in B for the number of pixels rows to process.
CopyRevealLine_Loop 92EE LD A,(DE) Copy a byte of the dartboard graphic to the screen buffer.
92EF LD (HL),A
92F0 INC H Move to the next screen line.
92F1 INC D Move to the next dartboard graphic line.
92F2 DJNZ CopyRevealLine_Loop Decrease counter by one and loop back to CopyRevealLine_Loop until counter is zero.
Work out which attribute byte to apply.
92F4 POP HL Restore the screen position from the stack.
92F5 LD A,L Is the co-ordinate in the menu or dartboard area?
92F6 CP $08
Default with the dartboard attribute value.
92F8 LD A,$70 A=INK: BLACK, PAPER: YELLOW (BRIGHT) .
92FA JR NC,RevealLine_SetAttribute Jump to RevealLine_SetAttribute if the X co-ordinate is greater than or equal to 08.
The X co-ordinate was less than 08 so use the menu attribute value.
92FC LD A,$47 A=INK: WHITE, PAPER: BLACK (BRIGHT) .
RevealLine_SetAttribute 92FE EX AF,AF' Temporarily switch the AF register with the shadow AF register.
On return from CalculateAttributeBuffer HL will contain the attribute buffer location.
92FF CALL CalculateAttributeBuffer Call CalculateAttributeBuffer.
9302 EX AF,AF' Restore the AF register from the shadow AF register.
9303 LD (HL),A Write the colour attribute byte to *HL.
9304 RET Return.
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