properly support tga and webp images

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	_ "embed"
 	"fmt"
+	"image"
 	"log"
 	"os"
 	"path/filepath"
@@ -11,7 +12,9 @@ import (
 	"strings"
 
 	"git.yetaga.in/alazyreader/why/filetypes"
+	"github.com/dblezek/tga"
 	"github.com/disintegration/imaging"
+	"golang.org/x/image/webp"
 	tk "modernc.org/tk9.0"
 )
 
@@ -39,6 +42,10 @@ func must[T any](t T, err error) T {
 	return t
 }
 
+func checkErr[T any](_ T, err error) bool {
+	return err == nil
+}
+
 func isImage(entry os.DirEntry) bool {
 	if entry.IsDir() {
 		return false
@@ -108,11 +115,27 @@ func newDirectory(img *tk.LabelWidget) func() {
 }
 
 func updateImage(file string, img *tk.LabelWidget) {
-	i, err := imaging.Open(file, imaging.AutoOrientation(true))
+	var i image.Image
+
+	f, err := os.Open(file)
 	if err != nil {
 		log.Printf("error opening image: %v", err)
 		return
 	}
+	defer f.Close()
+
+	ext := strings.ToLower(strings.TrimPrefix(filepath.Ext(file), "."))
+	if checkErr(imaging.FormatFromExtension(ext)) {
+		i, err = imaging.Decode(f, imaging.AutoOrientation(true))
+	} else if ext == "webp" {
+		i, err = webp.Decode(f)
+	} else if ext == "tga" {
+		i, err = tga.Decode(f)
+	}
+	if err != nil {
+		log.Printf("error decoding image: %v", err)
+		return
+	}
 	i = imaging.Fit(i,
 		// -50 to give some space to breathe around the edges
 		must(strconv.Atoi(tk.WinfoScreenWidth(tk.App)))-50,