ebitenutil: deprecate some APIs

ebitenutil/file_js.go

@@ -28,6 +28,13 @@ func (f *file) Close() error {
 	return nil
 }
 
+// OpenFile opens a file and returns a stream for its data.
+//
+// The path parts should be separated with slash '/' on any environments.
+//
+// OpenFile doesn't work on mobiles.
+//
+// Deprecated: as of v2.4. Use os.Open on desktops and http.Get on browsers instead.
 func OpenFile(path string) (ReadSeekCloser, error) {
 	res, err := http.Get(path)
 	if err != nil {

ebitenutil/file_notjs.go

@@ -26,7 +26,9 @@ import (
 //
 // The path parts should be separated with slash '/' on any environments.
 //
-// Note that this doesn't work on mobiles.
+// OpenFile doesn't work on mobiles.
+//
+// Deprecated: as of v2.4. Use os.Open on desktops and http.Get on browsers instead.
 func OpenFile(path string) (ReadSeekCloser, error) {
 	return os.Open(filepath.FromSlash(path))
 }

ebitenutil/io.go

@@ -19,6 +19,8 @@ import (
 )
 
 // ReadSeekCloser is io.ReadSeeker and io.Closer.
+//
+// Deprecated: as of v2.4. Use io.ReadSeekCloser instead.
 type ReadSeekCloser interface {
 	io.ReadSeeker
 	io.Closer