Routines
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28845: Get Visible Height
Used by the routines at PrepareOldSprite and PrepareActorSprite.
Works out how many lines of a sprite can be drawn upwards from a position without reaching the top row of the screen (which is not part of the play area).
Input
H Y position of the sprite
Output
C Number of lines
GetVisibleHeight 28845 LD A,H Fetch the Y position of the sprite.
28846 SUB 8 Take 8 away, as the top row of the screen is not part of the play area.
28848 LD C,A Keep the number of lines that can be drawn in C.
28849 RET Return.
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