CheckVLine

Undocumented in source.
enum CheckVLine = q{ static if (CHECKED) { if (x < 0 || x >= v.w || y1 >= v.h || y2 <= 0 || y1 >= y2) return; if (y1 < 0) y1 = 0; if (y2 >= v.h) y2 = v.h; } assert(y1 <= y2); };

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