add support for depth in barcode generations

- Introduced depth parameter to EncodeWithDepth function to allow generating barcodes with specified color depth.
- Updated Encode function to use EncodeWithDepth with a default depth of 16.

aztec/azteccode.go

@@ -13,10 +13,11 @@ type aztecCode struct {
 	*utils.BitList
 	size    int
 	content []byte
+	depth int
 }
 
-func newAztecCode(size int) *aztecCode {
-	return &aztecCode{utils.NewBitList(size * size), size, nil}
+func newAztecCode(size int, depth int) *aztecCode {
+	return &aztecCode{utils.NewBitList(size * size), size, nil, 16}
 }
 
 func (c *aztecCode) Content() string {
@@ -28,7 +29,7 @@ func (c *aztecCode) Metadata() barcode.Metadata {
 }
 
 func (c *aztecCode) ColorModel() color.Model {
-	return color.Gray16Model
+	return utils.ColorModel(c.depth)
 }
 
 func (c *aztecCode) Bounds() image.Rectangle {
@@ -37,9 +38,9 @@ func (c *aztecCode) Bounds() image.Rectangle {
 
 func (c *aztecCode) At(x, y int) color.Color {
 	if c.GetBit(x*c.size + y) {
-		return color.Black
+		return utils.BlackColor(c.depth)
 	}
-	return color.White
+	return utils.WhiteColor(c.depth)
 }
 
 func (c *aztecCode) set(x, y int) {

aztec/encoder.go

@@ -123,7 +123,12 @@ func drawBullsEye(matrix *aztecCode, center, size int) {
 }
 
 // Encode returns an aztec barcode with the given content
-func Encode(data []byte, minECCPercent int, userSpecifiedLayers int) (barcode.Barcode, error) {
+func Encode(data []byte, minECCPercent int, userSpecifiedLayers int) (barcode.Barcode, error){
+	return EncodeWithDepth(data, minECCPercent, userSpecifiedLayers, 16)
+}
+
+// Encode returns an aztec barcode with the given content
+func EncodeWithDepth(data []byte, minECCPercent int, userSpecifiedLayers int, depth int) (barcode.Barcode, error) {
 	bits := highlevelEncode(data)
 	eccBits := ((bits.Len() * minECCPercent) / 100) + 11
 	totalSizeBits := bits.Len() + eccBits
@@ -215,7 +220,7 @@ func Encode(data []byte, minECCPercent int, userSpecifiedLayers int) (barcode.Ba
 			alignmentMap[origCenter+i] = center + newOffset + 1
 		}
 	}
-	code := newAztecCode(matrixSize)
+	code := newAztecCode(matrixSize, depth)
 	code.content = data
 
 	// draw data bits