godot/platform/android/power_android.cpp

/*************************************************************************/
/*  power_android.cpp                                                    */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
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/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
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/* distribute, sublicense, and/or sell copies of the Software, and to    */
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/* included in all copies or substantial portions of the Software.       */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
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#include "core/error_macros.h"

#include "power_android.h"

static void LocalReferenceHolder_Cleanup(struct LocalReferenceHolder *refholder) {
	if (refholder->m_env) {
		JNIEnv *env = refholder->m_env;
		(*env)->PopLocalFrame(env, NULL);
		--s_active;
	}
}

static struct LocalReferenceHolder LocalReferenceHolder_Setup(const char *func) {
	struct LocalReferenceHolder refholder;
	refholder.m_env = NULL;
	refholder.m_func = func;
	return refholder;
}

static bool LocalReferenceHolder_Init(struct LocalReferenceHolder *refholder, JNIEnv *env) {
	const int capacity = 16;
	if ((*env)->PushLocalFrame(env, capacity) < 0) {
		return false;
	}
	++s_active;
	refholder->m_env = env;
	return true;
}

static SDL_bool LocalReferenceHolder_IsActive(void) {
	return s_active > 0;
}

ANativeWindow *Android_JNI_GetNativeWindow(void) {
	ANativeWindow *anw;
	jobject s;
	JNIEnv *env = Android_JNI_GetEnv();

	s = (*env)->CallStaticObjectMethod(env, mActivityClass, midGetNativeSurface);
	anw = ANativeWindow_fromSurface(env, s);
	(*env)->DeleteLocalRef(env, s);

	return anw;
}

/* 
 *  CODE CHUNK IMPORTED FROM SDL 2.0
 * returns 0 on success or -1 on error (others undefined then)
 * returns truthy or falsy value in plugged, charged and battery
 * returns the value in seconds and percent or -1 if not available
 */
int Android_JNI_GetPowerInfo(int *plugged, int *charged, int *battery, int *seconds, int *percent) {
	env = Android_JNI_GetEnv();
	refs = LocalReferenceHolder_Setup(__FUNCTION__);

	if (!LocalReferenceHolder_Init(&refs, env)) {
		LocalReferenceHolder_Cleanup(&refs);
		return -1;
	}
	mid = (*env)->GetStaticMethodID(env, mActivityClass, "getContext", "()Landroid/content/Context;");
	context = (*env)->CallStaticObjectMethod(env, mActivityClass, mid);
	action = (*env)->NewStringUTF(env, "android.intent.action.BATTERY_CHANGED");
	cls = (*env)->FindClass(env, "android/content/IntentFilter");
	mid = (*env)->GetMethodID(env, cls, "<init>", "(Ljava/lang/String;)V");
	filter = (*env)->NewObject(env, cls, mid, action);
	(*env)->DeleteLocalRef(env, action);
	mid = (*env)->GetMethodID(env, mActivityClass, "registerReceiver", "(Landroid/content/BroadcastReceiver;Landroid/content/IntentFilter;)Landroid/content/Intent;");
	intent = (*env)->CallObjectMethod(env, context, mid, NULL, filter);
	(*env)->DeleteLocalRef(env, filter);
	cls = (*env)->GetObjectClass(env, intent);
	imid = (*env)->GetMethodID(env, cls, "getIntExtra", "(Ljava/lang/String;I)I");
// Watch out for C89 scoping rules because of the macro
#define GET_INT_EXTRA(var, key)                                \
	int var;                                                   \
	iname = (*env)->NewStringUTF(env, key);                    \
	var = (*env)->CallIntMethod(env, intent, imid, iname, -1); \
	(*env)->DeleteLocalRef(env, iname);
	bmid = (*env)->GetMethodID(env, cls, "getBooleanExtra", "(Ljava/lang/String;Z)Z");
// Watch out for C89 scoping rules because of the macro
#define GET_BOOL_EXTRA(var, key)                                          \
	int var;                                                              \
	bname = (*env)->NewStringUTF(env, key);                               \
	var = (*env)->CallBooleanMethod(env, intent, bmid, bname, JNI_FALSE); \
	(*env)->DeleteLocalRef(env, bname);
	if (plugged) {
		// Watch out for C89 scoping rules because of the macro
		GET_INT_EXTRA(plug, "plugged") // == BatteryManager.EXTRA_PLUGGED (API 5)
		if (plug == -1) {
			LocalReferenceHolder_Cleanup(&refs);
			return -1;
		}
		// 1 == BatteryManager.BATTERY_PLUGGED_AC
		// 2 == BatteryManager.BATTERY_PLUGGED_USB
		*plugged = (0 < plug) ? 1 : 0;
	}
	if (charged) {
		// Watch out for C89 scoping rules because of the macro
		GET_INT_EXTRA(status, "status") // == BatteryManager.EXTRA_STATUS (API 5)
		if (status == -1) {
			LocalReferenceHolder_Cleanup(&refs);
			return -1;
		}
		// 5 == BatteryManager.BATTERY_STATUS_FULL
		*charged = (status == 5) ? 1 : 0;
	}
	if (battery) {
		GET_BOOL_EXTRA(present, "present") // == BatteryManager.EXTRA_PRESENT (API 5)
		*battery = present ? 1 : 0;
	}
	if (seconds) {
		*seconds = -1; // not possible
	}
	if (percent) {
		int level;
		int scale;
		// Watch out for C89 scoping rules because of the macro
		{
			GET_INT_EXTRA(level_temp, "level") // == BatteryManager.EXTRA_LEVEL (API 5)
			level = level_temp;
		}
		// Watch out for C89 scoping rules because of the macro
		{
			GET_INT_EXTRA(scale_temp, "scale") // == BatteryManager.EXTRA_SCALE (API 5)
			scale = scale_temp;
		}
		if ((level == -1) || (scale == -1)) {
			LocalReferenceHolder_Cleanup(&refs);
			return -1;
		}
		*percent = level * 100 / scale;
	}
	(*env)->DeleteLocalRef(env, intent);
	LocalReferenceHolder_Cleanup(&refs);

	return 0;
}

bool power_android::GetPowerInfo_Android() {
	int battery;
	int plugged;
	int charged;

	if (Android_JNI_GetPowerInfo(&plugged, &charged, &battery, &this->nsecs_left, &this->percent_left) != -1) {
		if (plugged) {
			if (charged) {
				this->power_state = POWERSTATE_CHARGED;
			} else if (battery) {
				this->power_state = POWERSTATE_CHARGING;
			} else {
				this->power_state = POWERSTATE_NO_BATTERY;
				this->nsecs_left = -1;
				this->percent_left = -1;
			}
		} else {
			this->power_state = POWERSTATE_ON_BATTERY;
		}
	} else {
		this->power_state = POWERSTATE_UNKNOWN;
		this->nsecs_left = -1;
		this->percent_left = -1;
	}

	return true;
}

PowerState power_android::get_power_state() {
	if (GetPowerInfo_Android()) {
		return power_state;
	} else {
		WARN_PRINT("Power management is not implemented on this platform, defaulting to POWERSTATE_UNKNOWN");
		return POWERSTATE_UNKNOWN;
	}
}

int power_android::get_power_seconds_left() {
	if (GetPowerInfo_Android()) {
		return nsecs_left;
	} else {
		WARN_PRINT("Power management is not implemented on this platform, defaulting to -1");
		return -1;
	}
}

int power_android::get_power_percent_left() {
	if (GetPowerInfo_Android()) {
		return percent_left;
	} else {
		WARN_PRINT("Power management is not implemented on this platform, defaulting to -1");
		return -1;
	}
}

power_android::power_android()
	: nsecs_left(-1), percent_left(-1), power_state(POWERSTATE_UNKNOWN) {
}

power_android::~power_android() {
}