Routines
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7D30: Plot single glyph
This plots the specified glyph at the given screen address.
Used by the routine at wipe_message.
Note: This will only work for screen addresses that stay within their respective third of the screen.
Input
HL Glyph index.
DE Pointer to screen destination.
Output
HL Preserved.
DE Points to the next character position to the right.
plot_single_glyph 7D30 PUSH HL Preserve HL
7D31 LD L,A Point HL at the bitmap glyph we want to plot
7D32 LD H,$00
7D34 ADD HL,HL
7D35 ADD HL,HL
7D36 ADD HL,HL
7D37 LD BC,$A69E
7D3A ADD HL,BC
7D3B PUSH DE Preserve DE so we can return it incremented later
7D3C LD B,$08 8 rows
glyph_loop 7D3E LD A,(HL) Plot a byte (a row) of bitmap glyph
7D3F LD (DE),A
7D40 INC D Move down to the next scanline (DE increases by 256)
7D41 INC HL Move to the next byte of the bitmap glyph
7D42 DJNZ glyph_loop ...loop until the glyph is drawn
7D44 POP DE Restore and point DE at the next character position to the right
7D45 INC DE
7D46 POP HL Restore HL
7D47 RET Return
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