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─────Run-Time Library───────────────────────────────────────────────────────
 
     Some graphics routines (_lineto, _polygon, and _rectangle) output
     straight lines to the screen. The type of line can be controlled
     with the current line-style mask.
 
     The _getlinestyle function returns the current line-style mask.
     The mask is a 16-bit array; each bit represents a pixel in the
     line being drawn.
 
     If the bit is 1, the corresponding pixel is set to the color of
     the line (the current color). If the bit is 0, the corresponding
     pixel is left unchanged. The mask is repeated over the length of
     the line. The default mask is 0xFFFF (a solid line).
 
     Return Value
 
     If no mask has been set, _getlinestyle returns the default mask.
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