use different library to resize map

generator/generator.go

@@ -7,8 +7,6 @@ import (
 	"image/png"
 	"io"
 
-	"github.com/nfnt/resize"
-
 	"github.com/pkg/errors"
 	"github.com/tribalwarshelp/shared/models"
 )
@@ -136,8 +134,8 @@ func Generate(cfg Config) error {
 
 	var resizedImg image.Image = img
 	if cfg.Scale != 1 {
-		width := uint(float32(cfg.MapSize) * cfg.Scale)
-		resizedImg = resize.Resize(width, width, img, resize.Lanczos3)
+		width := int(float32(cfg.MapSize) * cfg.Scale)
+		resizedImg = scale(img, image.Rect(0, 0, width, width))
 	}
 
 	b := resizedImg.Bounds()

generator/helpers.go

@@ -5,6 +5,7 @@ import (
 	"image"
 	"image/color"
 
+	"golang.org/x/image/draw"
 	"golang.org/x/image/font"
 	"golang.org/x/image/font/basicfont"
 	"golang.org/x/image/math/fixed"
@@ -62,3 +63,9 @@ func drawText(img *image.RGBA, x, y int, col color.RGBA, text string) {
 	}
 	d.DrawString(text)
 }
+
+func scale(src image.Image, rect image.Rectangle) image.Image {
+	dst := image.NewRGBA(rect)
+	draw.NearestNeighbor.Scale(dst, rect, src, src.Bounds(), draw.Over, nil)
+	return dst
+}

go.mod

@@ -3,7 +3,6 @@ module github.com/tribalwarshelp/map-generator
 go 1.14
 
 require (
-	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646
 	github.com/pkg/errors v0.9.1
 	github.com/tribalwarshelp/shared v0.0.0-20200622084436-3a768c8bf574
 	golang.org/x/image v0.0.0-20200618115811-c13761719519

go.sum

@@ -1,5 +1,3 @@
-github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 h1:zYyBkD/k9seD2A7fsi6Oo2LfFZAehjjQMERAvZLEDnQ=
-github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646/go.mod h1:jpp1/29i3P1S/RLdc7JQKbRpFeM1dOBd8T9ki5s+AY8=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/tribalwarshelp/shared v0.0.0-20200622084436-3a768c8bf574 h1:y2EoH6zRK9Uc0AeswnJRYUUIQYcSLZB5VDFuxPCKxNM=