Replace cesu8 with simd_cesu8 (consistent with jni 0.22.2)

The `cesu8` crate hasn't been updated for 10 years where as the
`simd_cesu8` crate is more actively maintained and is expected to have
better performance in all conditions:

<https://docs.rs/simd_cesu8/latest/simd_cesu8/#benchmarks>

This change is consistent with the `jni` crate which switched to using
`simd_cesu8` in the 0.22.2 release - so this avoids needing to build
two separate crates for mutf8 encoding.

This also addresses the current CI issue that comes from incorrectly
depending on `cesu8 = "1"` instead of `"1.1.0"` (which adds the
java/mutf8 APIs that we used). Previously this went unnoticed because
of the `jni` crate pulling in the correct minimum version.

android-activity/Cargo.toml

@@ -21,14 +21,14 @@ rust-version = "1.85.0"
 # In general it's only the final application crate that needs
 # to decide on a backend.
 default = []
-game-activity = []
+game-activity = ["simd_cesu8"]
 native-activity = []
 api-level-30 = ["ndk/api-level-30"]
 
 [dependencies]
 log = "0.4"
-cesu8 = "1"
-jni = "0.22"
+simd_cesu8 = { version = "1.0.1", optional = true }
+jni = "0.22.2"
 ndk-sys = "0.6.0"
 ndk = { version = "0.9.0", default-features = false }
 ndk-context = "0.1.1"

android-activity/src/game_activity/mod.rs

@@ -216,7 +216,7 @@ impl NativeAppGlue {
     pub fn set_text_input_state(&self, state: TextInputState) {
         unsafe {
             let activity = (*self.as_ptr()).activity;
-            let modified_utf8 = cesu8::to_java_cesu8(&state.text);
+            let modified_utf8 = simd_cesu8::mutf8::encode(&state.text);
             let text_length = modified_utf8.len() as i32;
             let modified_utf8_bytes = modified_utf8.as_ptr();
             let ffi_state = ffi::GameTextInputState {
@@ -525,7 +525,7 @@ impl AndroidAppInner {
         let text_modified_utf8: *const u8 = (*state).text_UTF8.cast();
         let text_modified_utf8 =
             std::slice::from_raw_parts(text_modified_utf8, (*state).text_length as usize);
-        match cesu8::from_java_cesu8(text_modified_utf8) {
+        match simd_cesu8::mutf8::decode(text_modified_utf8) {
             Ok(str) => {
                 let len = str.len();
                 (*out_ptr).text = String::from(str);