move to codeberg (#10)

cmd/loader-fonts.go

@@ -0,0 +1,113 @@
+package cmd
+
+import (
+	"log"
+
+	"github.com/golang/freetype/truetype"
+	"github.com/tinne26/etxt"
+	"golang.org/x/image/font"
+)
+
+var FontRenderer = LoadFonts("assets/fonts")
+
+const (
+	GameFont       string = "NotoSans-Regular"
+	GameFontETXT   string = "Noto Sans"
+	FontSizeBig    int    = 48
+	FontSizeNormal int    = 24
+	FontSizeSmall  int    = 12
+)
+
+type Texter struct {
+	Renderer   *etxt.Renderer
+	FontNormal *font.Face
+	FontBig    *font.Face
+	FontSmall  *font.Face
+}
+
+func LoadFonts(dir string) Texter {
+	// load the font for use with ebitenui
+	fontbytes, err := assetfs.ReadFile(dir + "/" + GameFont + ".ttf")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	gamefont, err := truetype.Parse(fontbytes)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	gameface := truetype.NewFace(gamefont, &truetype.Options{
+		Size:    float64(FontSizeNormal),
+		DPI:     72,
+		Hinting: font.HintingFull,
+	})
+
+	biggameface := truetype.NewFace(gamefont, &truetype.Options{
+		Size:    float64(FontSizeBig),
+		DPI:     72,
+		Hinting: font.HintingFull,
+	})
+
+	smallgameface := truetype.NewFace(gamefont, &truetype.Options{
+		Size:    float64(FontSizeSmall),
+		DPI:     72,
+		Hinting: font.HintingFull,
+	})
+
+	// load the font for use with etxt
+	fontlib := etxt.NewFontLibrary()
+	_, _, err = fontlib.ParseEmbedDirFonts(dir, assetfs)
+	if err != nil {
+		log.Fatalf("Error while loading fonts: %s", err.Error())
+	}
+
+	/*
+		err = fontlib.EachFont(
+			func(fontName string, font *etxt.Font) error {
+				fmt.Printf("font: %s\n", fontName)
+				return nil
+			})
+		if err != nil {
+			log.Fatal(err)
+		}
+	*/
+
+	if !fontlib.HasFont(GameFontETXT) {
+		log.Fatal("missing font: " + GameFontETXT)
+	}
+
+	err = fontlib.EachFont(checkMissingRunes)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	renderer := etxt.NewStdRenderer()
+
+	glyphsCache := etxt.NewDefaultCache(10 * 1024 * 1024) // 10MB
+	renderer.SetCacheHandler(glyphsCache.NewHandler())
+	renderer.SetFont(fontlib.GetFont(GameFontETXT))
+
+	return Texter{
+		Renderer:   renderer,
+		FontNormal: &gameface,
+		FontBig:    &biggameface,
+		FontSmall:  &smallgameface,
+	}
+}
+
+// helper function used with FontLibrary.EachFont to make sure
+// all loaded fonts contain the characters or alphabet we want
+func checkMissingRunes(name string, font *etxt.Font) error {
+	const letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+	const symbols = "0123456789 .,;:!?-()[]{}_&#@"
+
+	missing, err := etxt.GetMissingRunes(font, letters+symbols)
+	if err != nil {
+		return err
+	}
+	if len(missing) > 0 {
+		log.Fatalf("Font '%s' missing runes: %s", name, string(missing))
+	}
+	return nil
+}