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Your last 2 checks look rather strange. Just do

if (roi_.width + 10 < img.cols) 
    roi_.width += 10;

if (roi_.height + 10 < img.rows) 
    roi_.height += 10;

Your last 2 checks look rather strange. Just do

if (roi_.width (roi_.x + roi_.width + 10 < img.cols) 
    roi_.width += 10;

if (roi_.height (roi_.y + roi_.height + 10 < img.rows) 
    roi_.height += 10;