Add text to image in go

main.go

package main

import (
	"encoding/csv"
	"fmt"
	"os"
	"strings"

	"github.com/fogleman/gg"
)

func main() {
	names, err := importCSV("./lista-rodolfo.csv")
	if err != nil {
		panic(err)
	}

	for _, v := range names {
		fmt.Printf("Gerando convite para: %s\n", v)
		if err := saveInvite(v); err != nil {
			panic(err)
		}
	}
}

func saveInvite(text string) error {
	const WIDTH = 1417
	const HEIGHT = 2000
	// const FONT = "./fonts/Open_Sans/OpenSans-Regular.ttf"
	// const FONT = "./fonts/Cinzel/static/Cinzel-Medium.ttf"
	const FONT = "./fonts/Montserrat/Montserrat-Regular.ttf"

	im, err := gg.LoadImage("src.png")
	if err != nil {
		return err
	}

	dc := gg.NewContext(WIDTH, HEIGHT)
	dc.SetRGB(1, 1, 1)
	dc.Clear()
	dc.SetRGB(0.45, 0.45, 0.45)
	if err := dc.LoadFontFace(FONT, 50); err != nil {
		return err
	}
	// dc.DrawStringAnchored(strings.ToUpper(text), WIDTH/2, 276, 0.5, 0.5)

	dc.DrawRoundedRectangle(0, 0, 512, 512, 0)
	dc.DrawImage(im, 0, 0)
	dc.DrawStringAnchored("PARA "+strings.ToUpper(text), WIDTH/2, 276, 0.5, 0.5)
	dc.Clip()

	fname := strings.ReplaceAll(text, " ", "_")

	// remove special chars
	// re, err := regexp.Compile(`[^\w]`)
	// if err != nil {
	// 	log.Fatal(err)
	// }

	return dc.SavePNG(fmt.Sprintf("./out/%s.png", fname))
}

func importCSV(path string) ([]string, error) {
	f, err := os.Open(path)
	if err != nil {
		return nil, err
	}
	defer f.Close()

	lines, err := csv.NewReader(f).ReadAll()
	if err != nil {
		return nil, err
	}

	var ret []string
	for _, l := range lines {
		ret = append(ret, l[0])
	}

	return ret, nil
}