Routines
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EF53: Part of DRAW_SPRITE: a sprite that starts left of the region
Used by the routine at DRAW_SPRITE.
A holds how many of the sprite's bytes lie left of the region's first. The columns drawn are the rest of the sprite, or, if it also runs past the region's right edge, the region's width and its spare column (bit 6 then: no spill beyond). The last byte left of the region is still read, and one more column drawn for it, because its shifted spill is the first visible column's left part; bit 5, set as the drawing starts, keeps it from being written itself.
Input
A The bytes cut off at the left
DRAW_SPRITE_CLIP_LEFT EF53 PUSH DE The sprite runs past the right edge too: the region's width and its spare column
EF54 LD E,A
EF55 ADD A,(IY+DRAW_WIDTH-V)
EF58 SUB (IY+FOUND_RECORD-V)
EF5B JR NC,DRAW_SPRITE_CLIP_LEFT_0
EF5D LD A,(DRAW_WIDTH)
EF60 SET 6,C
EF62 INC A
EF63 JR DRAW_SPRITE_CLIP_LEFT_1
DRAW_SPRITE_CLIP_LEFT_0 EF65 LD A,(FOUND_RECORD) Or the rest of the sprite
EF68 SUB E
DRAW_SPRITE_CLIP_LEFT_1 EF69 POP DE On to skip the bytes cut off
EF6A JR DRAW_SPRITE_ROWS_0
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