Draw: SS.BmLine into the bitmap no layer shows. Each record is an absolute line; the FIFO drains only on odd visible lines and only on bus cycles the CPU leaves free (defs/wildbits.d, the LD_* notes).
3. 光栅化实战：Bresenham直线与扫描线填充的手写实现与性能对比 3.1 Bresenham直线算法：为什么不用Pygame.draw.line ()？ utils.py 中 bresenham_line (x0,y0,x1,y1) 是纯Python实现，不调用任何底层绘图API。
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