adds display package

fonts/fonts.go

@@ -0,0 +1,61 @@
+package fonts
+
+import (
+	"errors"
+	"fmt"
+	"image/color"
+)
+
+type Font map[string][][]byte
+
+var (
+	ErrCharNotFound = errors.New("unrecognized character")
+)
+
+func (f Font) ToColor(char string, c color.RGBA) ([][]color.RGBA, error) {
+	bitmap, found := f[char]
+	if !found {
+		return nil, fmt.Errorf("%w: %s", ErrCharNotFound, char)
+	}
+
+	colorMappedChar := make([][]color.RGBA, 0, len(bitmap))
+	for _, row := range bitmap {
+		crow := make([]color.RGBA, 0, len(row))
+		for _, pixel := range row {
+			crowColor := c
+			crowColor.R = crowColor.R * pixel
+			crowColor.G = crowColor.G * pixel
+			crowColor.B = crowColor.B * pixel
+			crowColor.A = 0xff * pixel
+			crow = append(crow, crowColor)
+		}
+
+		colorMappedChar = append(colorMappedChar, crow)
+	}
+
+	return colorMappedChar, nil
+}
+
+var (
+	White = color.RGBA{
+		R: 255, G: 255, B: 255, A: 255,
+	}
+	Black = color.RGBA{
+		R: 0, G: 0, B: 0, A: 255,
+	}
+	DarkGrey = color.RGBA{
+		R: 70, G: 70, B: 70, A: 255,
+	}
+	Green = color.RGBA{
+		R: 34, G: 177, B: 76, A: 255,
+	}
+	Orange = color.RGBA{
+		R: 255, G: 126, B: 0, A: 255,
+	}
+	Red = color.RGBA{
+		R: 153, G: 0, B: 48, A: 255,
+	}
+	Blue = color.RGBA{
+		R: 0, G: 183, B: 239, A: 255,
+	}
+)