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#define StepLine(R,x1,y1,x2,y2) t1_StepLine(R,x1,y1,x2,y2)
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#define Bresenham(e,x1,y1,x2,y2) t1_Bresenham(e,x1,y1,x2,y2)
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extern void t1_StepLine ( struct region *R, fractpel x1, fractpel y1, fractpel x2, fractpel y2 );
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extern void t1_Bresenham ( pel *edgeP, fractpel x1, fractpel y1, fractpel x2, fractpel y2 );