CheckHLine
enum CheckHLine = 
q{
	static if (CHECKED)
	{
		if (x1 >= v.w || x2 <= 0 || y < 0 || y >= v.h || x1 >= x2) return;
		if (x1 <    0) x1 =   0;
		if (x2 >= v.w) x2 = v.w;
	}
	assert(x1 <= x2);
};
  
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