Smooth text boundary

[frankegoesdown]

Hi! I have a little trouble with gocv

For example I have a code

package main

import (
    "fmt"
    "image"
    "image/color"
    "image/jpeg"
    "os"

    "gocv.io/x/gocv"
)

func main() {
    height := 50
    width := 120
    defaultFontScale := 1.
    defaultThickness := 1
    backgroundColor := color.RGBA{240, 232, 243, 0}
    textColor := color.RGBA{108, 58, 98, 255}
    brandImage := gocv.NewMatWithSize(height, width, gocv.MatTypeCV8UC3)
    defer brandImage.Close()

    pointText := image.Point{6, 30}
    points := [][]image.Point{
        {
            image.Pt(0, 0),
            image.Pt(width, 0),
            image.Pt(width, height),
            image.Pt(0, height),
        },
    }
    gocv.Rectangle(&brandImage, image.Rect(0, 50, 120, 50), backgroundColor, defaultThickness)
    gocv.FillPoly(&brandImage, points, backgroundColor)
    gocv.PutText(&brandImage, "Mijello", pointText, gocv.FontHersheyComplex, defaultFontScale, textColor, defaultThickness)
    l, _ := brandImage.ToImage()
    f, _ := os.Create("pathToFile/brand.jpg")
    err := jpeg.Encode(f, l, nil)
    if err != nil {
        fmt.Println(err)
    }
}

This example generates image with text like that:

Function PutText in imgproc.go

// PutText draws a text string.
// It renders the specified text string into the img Mat at the location
// passed in the "org" param, using the desired font face, font scale,
// color, and line thinkness.
//
// For further details, please see:
// http://docs.opencv.org/master/d6/d6e/group__imgproc__draw.html#ga5126f47f883d730f633d74f07456c576
//
func PutText(img *Mat, text string, org image.Point, fontFace HersheyFont, fontScale float64, c color.RGBA, thickness int) {
	cText := C.CString(text)
	defer C.free(unsafe.Pointer(cText))

	pOrg := C.struct_Point{
		x: C.int(org.X),
		y: C.int(org.Y),
	}

	sColor := C.struct_Scalar{
		val1: C.double(c.B),
		val2: C.double(c.G),
		val3: C.double(c.R),
		val4: C.double(c.A),
	}

	C.PutText(img.p, cText, pOrg, C.int(fontFace), C.double(fontScale), sColor, C.int(thickness))
	return
}

But optional parameter lineType is ommited. How can I smooth borders? Expected output:

Thank for the advice