textSize

pub fn textSize(self: Font, text: []const u8) Size {
    if (text.len == 0) {
        // just want the normal text height
        return .{ .w = 0, .h = self.textHeight() };
    }

    var ret = Size{};

    var line_height_adj: f32 = 0.0;
    var end: usize = 0;
    while (end < text.len) {
        if (end > 0) {
            ret.h += line_height_adj;
        }

        var end_idx: usize = undefined;
        var s = self.textSizeEx(text[end..], .{ .end_idx = &end_idx, .end_metric = .before });
        if (self.line_height_factor >= 1.0) {
            line_height_adj = s.h * (self.line_height_factor - 1.0);
        } else {
            s.h *= self.line_height_factor;
        }
        ret.h += s.h;
        ret.w = @max(ret.w, s.w);

        end += end_idx;
    }

    return ret;
}