var yoff;
if (yVel <= 0)
{
    yoff = (-1 + (yVel * 2))
    if (collision_line(x, (y + collisionBoundsOffsetTopY), x, ((y + collisionBoundsOffsetTopY) + yoff), oSolid, true, true) == -4)
    {
        if (collision_line((x + collisionBoundsOffsetLeftX), (y + collisionBoundsOffsetTopY), (x + collisionBoundsOffsetLeftX), ((y + collisionBoundsOffsetTopY) + yoff), oSolid, true, true) > 0)
            return 1;
    }
}
return 0;