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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "window_manager.h"
#include "accessors/display_manager.h"
#include "accessors/service_manager.h"
#include "jvm.h"
#include "log.h"
static screensharing::WindowManager* window_manager_instance_ = nullptr;
namespace screensharing {
using namespace std;
WindowManager::WindowManager(Jni jni)
: window_manager_(ServiceManager::GetServiceAsInterface(jni, "window", "android/view/IWindowManager")),
rotation_(),
rotation_watchers_(new set<RotationWatcher*>()) {
JClass window_manager_class(window_manager_.GetClass());
int api_level = android_get_device_api_level();
// The getDefaultDisplayRotation method was called getRotation before API 26.
// See https://android.googlesource.com/platform/frameworks/base/+/5406e7ade87c33f70c83a283781dcc48fb67cdb9%5E%21/#F2.
const char* method_name = api_level >= 26 ? "getDefaultDisplayRotation" : "getRotation";
get_default_display_rotation_method_ = window_manager_class.GetMethodId(method_name, "()I");
freeze_rotation_method_ = window_manager_class.GetMethodId("freezeRotation", "(I)V");
thaw_rotation_method_ = window_manager_class.GetMethodId("thawRotation", "()V");
is_rotation_frozen_method_ = window_manager_class.GetMethodId("isRotationFrozen", "()Z");
// The second parameter was added in API 26.
// See https://android.googlesource.com/platform/frameworks/base/+/35fa3c26adcb5f6577849fd0df5228b1f67cf2c6%5E%21/#F4.
const char* signature = api_level >= 26 ? "(Landroid/view/IRotationWatcher;I)I" : "(Landroid/view/IRotationWatcher;)I";
jmethodID watch_rotation_method_ = window_manager_class.GetMethodId("watchRotation", signature);
JClass rotation_watcher_class = jni.GetClass("com/android/tools/screensharing/RotationWatcher");
jmethodID rotation_watcher_constructor = rotation_watcher_class.GetConstructorId("()V");
watcher_object_ = rotation_watcher_class.NewObject(rotation_watcher_constructor);
rotation_ = api_level >= 26 ?
window_manager_.CallIntMethod(watch_rotation_method_, watcher_object_.ref(), DEFAULT_DISPLAY) :
window_manager_.CallIntMethod(watch_rotation_method_, watcher_object_.ref());
window_manager_.MakeGlobal();
watcher_object_.MakeGlobal();
}
WindowManager::~WindowManager() {
Jni jni = Jvm::GetJni();
JClass window_manager_class(window_manager_.GetClass(jni));
jmethodID remove_rotation_watcher_method =
window_manager_class.GetMethodId("removeRotationWatcher", "(Landroid/view/IRotationWatcher;)V");
window_manager_.CallVoidMethod(jni, remove_rotation_watcher_method);
}
WindowManager& WindowManager::GetInstance(Jni jni) {
if (window_manager_instance_ == nullptr) {
window_manager_instance_ = new WindowManager(jni);
}
return *window_manager_instance_;
}
int WindowManager::GetDefaultDisplayRotation(Jni jni) {
WindowManager& instance = GetInstance(jni);
return instance.window_manager_.CallIntMethod(jni, instance.get_default_display_rotation_method_);
}
void WindowManager::FreezeRotation(Jni jni, int32_t rotation) {
WindowManager& instance = GetInstance(jni);
Log::D("WindowManager::FreezeRotation: setting display orientation to %d", rotation);
instance.window_manager_.CallVoidMethod(jni, instance.freeze_rotation_method_, rotation);
}
void WindowManager::ThawRotation(Jni jni) {
WindowManager& instance = GetInstance(jni);
instance.window_manager_.CallVoidMethod(jni, instance.thaw_rotation_method_);
}
bool WindowManager::IsRotationFrozen(Jni jni) {
WindowManager& instance = GetInstance(jni);
return instance.window_manager_.CallBooleanMethod(jni, instance.is_rotation_frozen_method_);
}
int32_t WindowManager::WatchRotation(Jni jni, RotationWatcher* watcher) {
WindowManager& instance = GetInstance(jni);
for (;;) {
auto old_watchers = instance.rotation_watchers_.load();
auto new_watchers = new set<RotationWatcher*>(*old_watchers);
if (new_watchers->insert(watcher).second && instance.rotation_watchers_.compare_exchange_strong(old_watchers, new_watchers)) {
delete old_watchers;
break;
}
delete new_watchers;
}
return instance.rotation_;
}
void WindowManager::RemoveRotationWatcher(Jni jni, RotationWatcher* watcher) {
WindowManager& instance = GetInstance(jni);
for (;;) {
auto old_watchers = instance.rotation_watchers_.load();
auto new_watchers = new set<RotationWatcher*>(*old_watchers);
if (new_watchers->erase(watcher) != 0 && instance.rotation_watchers_.compare_exchange_strong(old_watchers, new_watchers)) {
delete old_watchers;
break;
}
delete new_watchers;
}
}
void WindowManager::OnRotationChanged(int32_t rotation) {
rotation_ = rotation;
for (auto watcher : *rotation_watchers_.load()) {
watcher->OnRotationChanged(rotation);
}
}
} // namespace screensharing
extern "C"
JNIEXPORT void JNICALL
Java_com_android_tools_screensharing_RotationWatcher_onRotationChanged(JNIEnv* jni_env, jobject thiz, jint rotation) {
if (window_manager_instance_ != nullptr) {
window_manager_instance_->OnRotationChanged(rotation);
}
}
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