Add DisableBorder option to disable the QR Code quiet zone entirely, thus no more margins/borders. Defaults to borders for compatibility.

example_test.go

@@ -9,6 +9,7 @@ package qrcode
 
 import (
 	"fmt"
+	"image/color"
 	"os"
 	"testing"
 )
@@ -29,3 +30,24 @@ func TestExampleWriteFile(t *testing.T) {
 		}
 	}
 }
+
+func TestExampleEncodeWithColourAndWithoutBorder(t *testing.T) {
+	q, err := New("https://example.org", Medium)
+	if err != nil {
+		t.Errorf("Error: %s", err)
+		return
+	}
+
+	// Optionally, disable the QR Code border.
+	q.DisableBorder = true
+
+	// Optionally, set the colours.
+	q.ForegroundColor = color.RGBA{R: 0x33, G: 0x33, B: 0x66, A: 0xff}
+	q.BackgroundColor = color.RGBA{R: 0xef, G: 0xef, B: 0xef, A: 0xff}
+
+	err = q.WriteFile(256, "example2.png")
+	if err != nil {
+		t.Errorf("Error: %s", err)
+		return
+	}
+}

qrcode.go

@@ -135,6 +135,9 @@ type QRCode struct {
 	ForegroundColor color.Color
 	BackgroundColor color.Color
 
+	// Disable the QR Code border.
+	DisableBorder bool
+
 	encoder *dataEncoder
 	version qrCodeVersion
 
@@ -193,8 +196,6 @@ func New(content string, level RecoveryLevel) (*QRCode, error) {
 		version: *chosenVersion,
 	}
 
-	q.encode(chosenVersion.numTerminatorBitsRequired(encoded.Len()))
-
 	return q, nil
 }
 
@@ -239,8 +240,6 @@ func newWithForcedVersion(content string, version int, level RecoveryLevel) (*QR
 		version: *chosenVersion,
 	}
 
-	q.encode(chosenVersion.numTerminatorBitsRequired(encoded.Len()))
-
 	return q, nil
 }
 
@@ -251,6 +250,9 @@ func newWithForcedVersion(content string, version int, level RecoveryLevel) (*QR
 // The bitmap includes the required "quiet zone" around the QR Code to aid
 // decoding.
 func (q *QRCode) Bitmap() [][]bool {
+	// Build QR code.
+	q.encode()
+
 	return q.symbol.bitmap()
 }
 
@@ -268,6 +270,9 @@ func (q *QRCode) Bitmap() [][]bool {
 // negative number to increase the scale of the image. e.g. a size of -5 causes
 // each module (QR Code "pixel") to be 5px in size.
 func (q *QRCode) Image(size int) image.Image {
+	// Build QR code.
+	q.encode()
+
 	// Minimum pixels (both width and height) required.
 	realSize := q.symbol.size
 
@@ -296,11 +301,12 @@ func (q *QRCode) Image(size int) image.Image {
 	// Map each image pixel to the nearest QR code module.
 	modulesPerPixel := float64(realSize) / float64(size)
 	for y := 0; y < size; y++ {
+		y2 := int(float64(y) * modulesPerPixel)
 		for x := 0; x < size; x++ {
-			y2 := int(float64(y) * modulesPerPixel)
 			x2 := int(float64(x) * modulesPerPixel)
 
 			v := bitmap[y2][x2]
+
 			if v {
 				pos := img.PixOffset(x, y)
 				img.Pix[pos] = fgClr
@@ -368,7 +374,9 @@ func (q *QRCode) WriteFile(size int, filename string) error {
 // encode completes the steps required to encode the QR Code. These include
 // adding the terminator bits and padding, splitting the data into blocks and
 // applying the error correction, and selecting the best data mask.
-func (q *QRCode) encode(numTerminatorBits int) {
+func (q *QRCode) encode() {
+	numTerminatorBits := q.version.numTerminatorBitsRequired(q.data.Len())
+
 	q.addTerminatorBits(numTerminatorBits)
 	q.addPadding()
 
@@ -381,7 +389,7 @@ func (q *QRCode) encode(numTerminatorBits int) {
 		var s *symbol
 		var err error
 
-		s, err = buildRegularSymbol(q.version, mask, encoded)
+		s, err = buildRegularSymbol(q.version, mask, encoded, !q.DisableBorder)
 
 		if err != nil {
 			log.Panic(err.Error())

qrcode/main.go

@@ -17,6 +17,7 @@ func main() {
 	size := flag.Int("s", 256, "image size (pixel)")
 	textArt := flag.Bool("t", false, "print as text-art on stdout")
 	negative := flag.Bool("i", false, "invert black and white")
+	disableBorder := flag.Bool("d", false, "disable QR Code border")
 	flag.Usage = func() {
 		fmt.Fprintf(os.Stderr, `qrcode -- QR Code encoder in Go
 https://github.com/skip2/go-qrcode
@@ -52,6 +53,10 @@ Usage:
 	q, err = qrcode.New(content, qrcode.Highest)
 	checkError(err)
 
+	if *disableBorder {
+		q.DisableBorder = true
+	}
+
 	if *textArt {
 		art := q.ToString(*negative)
 		fmt.Println(art)

qrcode_test.go

@@ -151,6 +151,8 @@ func TestQRCodeISOAnnexIExample(t *testing.T) {
 			err.Error())
 	}
 
+	q.encode()
+
 	const expectedMask int = 2
 
 	if q.mask != 2 {

regular_symbol.go

@@ -105,13 +105,19 @@ var (
 )
 
 func buildRegularSymbol(version qrCodeVersion, mask int,
-	data *bitset.Bitset) (*symbol, error) {
+	data *bitset.Bitset, includeQuietZone bool) (*symbol, error) {
+
+	quietZoneSize := 0
+	if includeQuietZone {
+		quietZoneSize = version.quietZoneSize()
+	}
+
 	m := &regularSymbol{
 		version: version,
 		mask:    mask,
 		data:    data,
 
-		symbol: newSymbol(version.symbolSize(), version.quietZoneSize()),
+		symbol: newSymbol(version.symbolSize(), quietZoneSize),
 		size:   version.symbolSize(),
 	}
 

regular_symbol_test.go

@@ -19,7 +19,7 @@ func TestBuildRegularSymbol(t *testing.T) {
 			data.AppendNumBools(8, false)
 		}
 
-		s, err := buildRegularSymbol(*v, k, data)
+		s, err := buildRegularSymbol(*v, k, data, false)
 
 		if err != nil {
 			fmt.Println(err.Error())