Add ColorScheme type and predefined color schemes for barcode rendering

color_scheme.go

@@ -0,0 +1,39 @@
+package barcode
+
+import "image/color"
+
+// ColorScheme defines a structure for color schemes used in barcode rendering.
+// It includes the color model, background color, and foreground color.
+type ColorScheme struct {
+	Model      color.Model // Color model to be used (e.g., grayscale, RGB, RGBA)
+	Background color.Color // Color of the background
+	Foreground color.Color // Color of the foreground (e.g., bars in a barcode)
+}
+
+// ColorScheme8 represents a color scheme with 8-bit grayscale colors.
+var ColorScheme8 = ColorScheme{
+	Model:      color.GrayModel,
+	Background: color.Gray{Y: 255},
+	Foreground: color.Gray{Y: 0},
+}
+
+// ColorScheme16 represents a color scheme with 16-bit grayscale colors.
+var ColorScheme16 = ColorScheme{
+	Model:      color.Gray16Model,
+	Background: color.White,
+	Foreground: color.Black,
+}
+
+// ColorScheme24 represents a color scheme with 24-bit RGB colors.
+var ColorScheme24 = ColorScheme{
+	Model:      color.RGBAModel,
+	Background: color.RGBA{255, 255, 255, 255},
+	Foreground: color.RGBA{0, 0, 0, 255},
+}
+
+// ColorScheme32 represents a color scheme with 32-bit RGBA colors, which is similar to ColorScheme24 but typically includes alpha for transparency.
+var ColorScheme32 = ColorScheme{
+	Model:      color.RGBAModel,
+	Background: color.RGBA{255, 255, 255, 255},
+	Foreground: color.RGBA{0, 0, 0, 255},
+}