CheckVLine
nothrow @nogc
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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