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use std::cell::{Cell};
use std::ffi::{CString};
use std::mem;
use std::os::raw::c_void;
use std::os::raw::c_char;
use std::os::raw::c_int;
use std::os::raw::c_long;
use std::ptr;
use std::sync::mpsc::{Sender, Receiver, TryRecvError, channel};
use std::sync::Mutex;
use std::thread;
use std::slice;
use std::sync::atomic::{AtomicUsize, AtomicBool, Ordering};
use std::io::Write;
pub type pthread_t = c_long;
pub type pthread_mutexattr_t = c_long;
pub type pthread_attr_t = c_void;
extern {
fn pipe(_: *mut c_int) -> c_int;
fn dup2(fildes: c_int, fildes2: c_int) -> c_int;
fn read(fd: c_int, buf: *mut c_void, count: usize) -> isize;
fn pthread_create(_: *mut pthread_t, _: *const pthread_attr_t,
_: extern fn(*mut c_void) -> *mut c_void, _: *mut c_void) -> c_int;
fn pthread_detach(thread: pthread_t) -> c_int;
}
#[doc(hidden)]
pub mod ffi;
#[no_mangle]
pub unsafe extern fn cargo_apk_injected_glue_get_native_window() -> *const c_void {
get_native_window() as *const _
}
#[no_mangle]
pub unsafe extern fn cargo_apk_injected_glue_add_sender(sender: *mut ()) {
let sender: Box<Sender<Event>> = Box::from_raw(sender as *mut _);
add_sender(*sender);
}
#[no_mangle]
pub unsafe extern fn cargo_apk_injected_glue_add_sync_event_handler(handler: *mut ()) {
let handler: Box<Box<SyncEventHandler>> = Box::from_raw(handler as *mut _);
add_sync_event_handler(*handler);
}
#[no_mangle]
pub unsafe extern fn cargo_apk_injected_glue_remove_sync_event_handler(handler: *mut ()) {
let handler: Box<*const SyncEventHandler> = Box::from_raw(handler as *mut _);
remove_sync_event_handler(*handler);
}
#[no_mangle]
pub unsafe extern fn cargo_apk_injected_glue_add_sender_missing(sender: *mut ()) {
let sender: Box<Sender<Event>> = Box::from_raw(sender as *mut _);
add_sender_missing(*sender);
}
#[no_mangle]
pub unsafe extern fn cargo_apk_injected_glue_set_multitouch(multitouch: bool) {
set_multitouch(multitouch);
}
#[no_mangle]
pub unsafe extern fn cargo_apk_injected_glue_write_log(ptr: *const (), len: usize) {
let message: &str = mem::transmute((ptr, len));
write_log(message);
}
#[no_mangle]
pub unsafe extern fn cargo_apk_injected_glue_load_asset(ptr: *const (), len: usize) -> *mut c_void {
let filename: &str = mem::transmute((ptr, len));
let data = load_asset(filename);
Box::into_raw(Box::new(data)) as *mut _
}
#[no_mangle]
pub unsafe extern fn cargo_apk_injected_glue_wake_event_loop() {
ffi::ALooper_wake(get_app().looper);
}
#[no_mangle]
pub static mut ANDROID_APP: *mut ffi::android_app = 0 as *mut ffi::android_app;
#[doc(hidden)]
struct Context {
senders: Mutex<Vec<Sender<Event>>>,
sync_event_handlers: Mutex<Vec<Box<SyncEventHandler>>>,
missed: Mutex<Vec<Event>>,
missedcnt: AtomicUsize,
missedmax: usize,
shutdown: AtomicBool,
multitouch: Cell<bool>,
primary_pointer_id: Cell<i32>,
}
#[derive(Clone, Copy, Debug)]
pub enum Event {
EventMotion(Motion),
EventKeyUp,
EventKeyDown,
InitWindow,
SaveState,
TermWindow,
GainedFocus,
LostFocus,
InputChanged,
WindowResized,
WindowRedrawNeeded,
ContentRectChanged,
ConfigChanged,
LowMemory,
Start,
Resume,
Pause,
Stop,
Destroy,
Wake
}
#[derive(Clone, Copy, Debug)]
pub struct Motion {
pub action: MotionAction,
pub pointer_id: i32,
pub x: f32,
pub y: f32,
}
#[derive(Clone, Copy, Debug)]
pub enum MotionAction {
Down,
Move,
Up,
Cancel,
}
pub trait SyncEventHandler {
fn handle(&mut self, event: &Event);
}
static mut g_mainthread_boxed: Option<*mut Receiver<()>> = Option::None;
fn is_app_thread_terminated() -> (bool, bool) {
if unsafe { g_mainthread_boxed.is_some() } {
let raw = unsafe { g_mainthread_boxed.unwrap() };
let br: &mut Receiver<()> = unsafe { std::mem::transmute(raw) };
let result = br.try_recv();
let terminated = if result.is_err() {
match result.err().unwrap() {
TryRecvError::Disconnected => (true, true),
TryRecvError::Empty => (false, false),
}
} else {
(true, false)
};
unsafe { g_mainthread_boxed = Option::Some(raw) };
terminated
} else {
(true, false)
}
}
pub fn get_app<'a>() -> &'a mut ffi::android_app {
unsafe { &mut *ANDROID_APP }
}
#[doc(hidden)]
pub fn android_main2<F>(app: *mut ffi::android_app, main_function: F)
where F: FnOnce(isize, *const *const u8) + 'static + Send
{
write_log("Entering android_main");
unsafe { ANDROID_APP = app; };
let app: &mut ffi::android_app = unsafe { &mut *app };
let context = Context {
senders: Mutex::new(Vec::new()),
sync_event_handlers: Mutex::new(Vec::new()),
missed: Mutex::new(Vec::new()),
missedcnt: AtomicUsize::new(0),
missedmax: 1024,
shutdown: AtomicBool::new(false),
multitouch: Cell::new(false),
primary_pointer_id: Cell::new(0),
};
app.onAppCmd = commands_callback;
app.onInputEvent = inputs_callback;
app.userData = unsafe { &context as *const Context as *mut Context as *mut _ };
let terminated = is_app_thread_terminated();
if terminated.1 {
write_log("Abnormal exit of main application thread detected");
}
if terminated.0 {
write_log("Creating application thread");
unsafe {
let mut pfd: [c_int; 2] = [0, 0];
pipe(pfd.as_mut_ptr());
dup2(pfd[1], 1);
dup2(pfd[1], 2);
extern fn logging_thread(descriptor: *mut c_void) -> *mut c_void {
unsafe {
let descriptor = descriptor as usize as c_int;
let mut buf: Vec<c_char> = Vec::with_capacity(512);
let mut cursor = 0_usize;
let tag = CString::new("RustAndroidGlueStdouterr").unwrap();
let tag = tag.as_ptr();
loop {
let result = read(descriptor, buf.as_mut_ptr().offset(cursor as isize) as *mut _,
buf.capacity() - 1 - cursor);
let len = if result == 0 { return ptr::null_mut(); }
else if result < 0 { return ptr::null_mut(); }
else { result as usize + cursor };
buf.set_len(len);
if let Some(last_newline_pos) = buf.iter().rposition(|&c| c == b'\n' as c_char) {
buf[last_newline_pos] = b'\0' as c_char;
ffi::__android_log_write(3, tag, buf.as_ptr());
if last_newline_pos < buf.len() - 1 {
let last_newline_pos = last_newline_pos + 1;
cursor = buf.len() - last_newline_pos;
debug_assert!(cursor < buf.capacity());
for j in 0..cursor as usize {
buf[j] = buf[last_newline_pos + j];
}
buf[cursor] = b'\0' as c_char;
buf.set_len(cursor + 1);
} else {
cursor = 0;
}
} else {
cursor = buf.len();
}
if cursor == buf.capacity() - 1 {
ffi::__android_log_write(3, tag, buf.as_ptr());
buf.set_len(0);
cursor = 0;
}
}
}
}
let mut thread = mem::uninitialized();
let result = pthread_create(&mut thread, ptr::null(), logging_thread,
pfd[0] as usize as *mut c_void);
assert_eq!(result, 0);
let result = pthread_detach(thread);
assert_eq!(result, 0);
}
let main_function = Box::into_raw(Box::new(main_function));
extern fn main_thread<F>(main_function: *mut c_void) -> *mut c_void
where F: FnOnce(isize, *const *const u8) + 'static + Send
{
unsafe {
let main_function: Box<F> = Box::from_raw(main_function as *mut _);
let argv = [b"android\0".as_ptr()];
(*main_function)(1, argv.as_ptr());
ptr::null_mut()
}
}
let result = unsafe {
let mut out: pthread_t = -1;
pthread_create(&mut out, ptr::null(), main_thread::<F>,
main_function as *mut _)
};
assert!(result == 0);
} else {
write_log("Application thread was still running - not creating new one");
}
unsafe {
loop {
if context.shutdown.load(Ordering::Relaxed) {
break;
}
let mut events = mem::uninitialized();
let mut source: *mut ffi::android_poll_source = mem::uninitialized();
let code = ffi::ALooper_pollAll(-1, ptr::null_mut(), &mut events,
&mut source as *mut _ as *mut _);
if code == ffi::ALOOPER_POLL_WAKE {
send_event(Event::Wake)
}
if is_app_thread_terminated().0 {
}
if !source.is_null() {
((*source).process)(ANDROID_APP, source);
}
}
}
unsafe { ANDROID_APP = 0 as *mut ffi::android_app };
}
fn send_event(event: Event) {
let ctx = get_context();
{
let mut sync_handlers = ctx.sync_event_handlers.lock().ok().unwrap();
for handler in sync_handlers.iter_mut() {
handler.handle(&event);
}
}
let mut senders = ctx.senders.lock().ok().unwrap();
if senders.len() < 1 {
if ctx.missedcnt.load(Ordering::SeqCst) < ctx.missedmax {
let mut missed = ctx.missed.lock().unwrap();
missed.push(event);
ctx.missedcnt.fetch_add(1, Ordering::SeqCst);
}
}
senders.retain(|s| s.send(event).is_ok());
}
pub extern fn inputs_callback(_: *mut ffi::android_app, event: *const ffi::AInputEvent)
-> i32
{
let etype = unsafe { ffi::AInputEvent_getType(event) };
let action = unsafe { ffi::AMotionEvent_getAction(event) };
let action_code = action & ffi::AMOTION_EVENT_ACTION_MASK;
match etype {
ffi::AINPUT_EVENT_TYPE_KEY => match action_code {
ffi::AKEY_EVENT_ACTION_DOWN => { send_event(Event::EventKeyDown); },
ffi::AKEY_EVENT_ACTION_UP => send_event(Event::EventKeyUp),
_ => write_log(&format!("unknown input-event-type:{} action_code:{}", etype, action_code)),
},
ffi::AINPUT_EVENT_TYPE_MOTION => {
let motion_action = match action_code {
ffi::AMOTION_EVENT_ACTION_DOWN |
ffi::AMOTION_EVENT_ACTION_POINTER_DOWN => MotionAction::Down,
ffi::AMOTION_EVENT_ACTION_UP |
ffi::AMOTION_EVENT_ACTION_POINTER_UP => MotionAction::Up,
ffi::AMOTION_EVENT_ACTION_MOVE => MotionAction::Move,
ffi::AMOTION_EVENT_ACTION_CANCEL => MotionAction::Cancel,
_ => {
write_log(&format!("unknown action_code:{}", action_code));
return 0
}
};
let context = get_context();
let idx = ((action & ffi::AMOTION_EVENT_ACTION_POINTER_INDEX_MASK)
>> ffi::AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT)
as usize;
let pointer_id = unsafe { ffi::AMotionEvent_getPointerId(event, idx) };
if action_code == ffi::AMOTION_EVENT_ACTION_DOWN {
context.primary_pointer_id.set(pointer_id);
}
let primary_pointer_id = context.primary_pointer_id.get();
let multitouch = context.multitouch.get();
match motion_action {
MotionAction::Down | MotionAction::Up | MotionAction::Cancel => {
if multitouch || pointer_id == primary_pointer_id {
send_event(Event::EventMotion(Motion {
action: motion_action,
pointer_id: pointer_id,
x: unsafe { ffi::AMotionEvent_getX(event, idx) },
y: unsafe { ffi::AMotionEvent_getY(event, idx) },
}));
}
}
MotionAction::Move => {
let pointer_count = unsafe { ffi::AMotionEvent_getPointerCount(event) };
for idx in 0..pointer_count {
let pointer_id = unsafe { ffi::AMotionEvent_getPointerId(event, idx) };
if multitouch || pointer_id == primary_pointer_id {
send_event(Event::EventMotion(Motion {
action: motion_action,
pointer_id: pointer_id,
x: unsafe { ffi::AMotionEvent_getX(event, idx) },
y: unsafe { ffi::AMotionEvent_getY(event, idx) },
}));
}
}
}
}
},
_ => write_log(&format!("unknown input-event-type:{} action_code:{}", etype, action_code)),
}
0
}
#[doc(hidden)]
pub extern fn commands_callback(_: *mut ffi::android_app, command: i32) {
let context = get_context();
match command {
ffi::APP_CMD_INIT_WINDOW => send_event(Event::InitWindow),
ffi::APP_CMD_SAVE_STATE => send_event(Event::SaveState),
ffi::APP_CMD_TERM_WINDOW => send_event(Event::TermWindow),
ffi::APP_CMD_GAINED_FOCUS => send_event(Event::GainedFocus),
ffi::APP_CMD_LOST_FOCUS => send_event(Event::LostFocus),
ffi::APP_CMD_INPUT_CHANGED => send_event(Event::InputChanged),
ffi::APP_CMD_WINDOW_RESIZED => send_event(Event::WindowResized),
ffi::APP_CMD_WINDOW_REDRAW_NEEDED => send_event(Event::WindowRedrawNeeded),
ffi::APP_CMD_CONTENT_RECT_CHANGED => send_event(Event::ContentRectChanged),
ffi::APP_CMD_CONFIG_CHANGED => send_event(Event::ConfigChanged),
ffi::APP_CMD_LOW_MEMORY => send_event(Event::LowMemory),
ffi::APP_CMD_START => send_event(Event::Start),
ffi::APP_CMD_RESUME => send_event(Event::Resume),
ffi::APP_CMD_PAUSE => send_event(Event::Pause),
ffi::APP_CMD_STOP => send_event(Event::Stop),
ffi::APP_CMD_DESTROY => {
send_event(Event::Destroy);
context.shutdown.store(true, Ordering::Relaxed);
},
_ => write_log(&format!("unknown command {}", command)),
}
}
fn get_context() -> &'static Context {
let context = unsafe { (*ANDROID_APP).userData };
unsafe { std::mem::transmute(context) }
}
pub fn add_sender(sender: Sender<Event>) {
get_context().senders.lock().unwrap().push(sender);
}
pub fn add_sync_event_handler(handler: Box<SyncEventHandler>) {
let mut handlers = get_context().sync_event_handlers.lock().unwrap();
handlers.push(handler);
}
pub fn remove_sync_event_handler(handler: *const SyncEventHandler) {
let mut handlers = get_context().sync_event_handlers.lock().unwrap();
handlers.retain(|ref b| b.as_ref() as *const _ != handler);
}
pub fn set_multitouch(multitouch: bool) {
get_context().multitouch.set(multitouch);
}
pub fn add_sender_missing(sender: Sender<Event>) {
let ctx = get_context();
let mut senders = ctx.senders.lock().ok().unwrap();
if senders.len() == 0 {
let mut missed = ctx.missed.lock().unwrap();
while missed.len() > 0 {
sender.send(missed.remove(0)).unwrap();
}
ctx.missedcnt.store(0, Ordering::Relaxed);
}
senders.push(sender);
}
pub unsafe fn get_native_window() -> ffi::NativeWindowType {
if ANDROID_APP.is_null() {
panic!("The application was not initialized from android_main");
}
loop {
let value = (*ANDROID_APP).window;
if !value.is_null() {
return value;
}
thread::sleep_ms(10);
}
}
pub fn write_log(message: &str) {
let message = CString::new(message).unwrap();
let message = message.as_ptr();
let tag = CString::new("RustAndroidGlueStdouterr").unwrap();
let tag = tag.as_ptr();
unsafe { ffi::__android_log_write(3, tag, message) };
}
pub enum AssetError {
AssetMissing,
EmptyBuffer,
}
pub fn load_asset(filename: &str) -> Result<Vec<u8>, AssetError> {
struct AssetCloser {
asset: *mut ffi::Asset,
}
impl Drop for AssetCloser {
fn drop(&mut self) {
unsafe {
ffi::AAsset_close(self.asset)
};
}
}
unsafe fn get_asset_manager() -> *mut ffi::AAssetManager {
let app = &*ANDROID_APP;
let activity = &*app.activity;
activity.assetManager
}
let filename_c_str = CString::new(filename).unwrap();
let filename_c_str = filename_c_str.as_ptr();
let asset = unsafe {
ffi::AAssetManager_open(
get_asset_manager(), filename_c_str, ffi::MODE_STREAMING)
};
if asset.is_null() {
return Err(AssetError::AssetMissing);
}
let _asset_closer = AssetCloser{asset: asset};
let len = unsafe {
ffi::AAsset_getLength(asset)
};
let buff = unsafe {
ffi::AAsset_getBuffer(asset)
};
if buff.is_null() {
return Err(AssetError::EmptyBuffer);
}
let vec = unsafe {
slice::from_raw_parts(buff as *const u8, len as usize).to_vec()
};
Ok(vec)
}