monado/src/xrt/auxiliary/android/android_custom_surface.cpp

// Copyright 2020, Collabora, Ltd.
// SPDX-License-Identifier: BSL-1.0
/*!
 * @file
 * @brief  Implementation of native code for Android custom surface.
 * @author Ryan Pavlik <ryan.pavlik@collabora.com>
 * @author Lubosz Sarnecki <lubosz.sarnecki@collabora.com>
 * @ingroup aux_android
 */

#include "android_custom_surface.h"
#include "android_globals.h"
#include "android_load_class.hpp"

#include "xrt/xrt_config_android.h"
#include "util/u_logging.h"

#include "wrap/android.content.h"
#include "wrap/android.hardware.display.h"
#include "wrap/android.provider.h"
#include "wrap/android.view.h"
#include "org.freedesktop.monado.auxiliary.hpp"

#include <android/native_window_jni.h>

using wrap::android::content::Context;
using wrap::android::hardware::display::DisplayManager;
using wrap::android::provider::Settings;
using wrap::android::view::Display;
using wrap::android::view::SurfaceHolder;
using wrap::android::view::WindowManager_LayoutParams;
using wrap::org::freedesktop::monado::auxiliary::MonadoView;
using xrt::auxiliary::android::loadClassFromRuntimeApk;

struct android_custom_surface
{
	explicit android_custom_surface();
	~android_custom_surface();

	MonadoView monadoView{};
	jni::Class monadoViewClass{};
};


android_custom_surface::android_custom_surface() {}

android_custom_surface::~android_custom_surface()
{
	// Tell Java that native code is done with this.
	try {
		MonadoView::removeFromWindow(monadoView);
		if (!monadoView.isNull()) {
			monadoView.markAsDiscardedByNative();
		}
	} catch (std::exception const &e) {
		// Must catch and ignore any exceptions in the destructor!
		U_LOG_E("Failure while marking MonadoView as discarded: %s", e.what());
	}
}

struct android_custom_surface *
android_custom_surface_async_start(struct _JavaVM *vm, void *context, int32_t display_id)
{
	jni::init(vm);
	try {
		auto clazz = loadClassFromRuntimeApk((jobject)context, MonadoView::getFullyQualifiedTypeName());
		if (clazz.isNull()) {
			U_LOG_E("Could not load class '%s' from package '%s'", MonadoView::getFullyQualifiedTypeName(),
			        XRT_ANDROID_PACKAGE);
			return nullptr;
		}

		// Teach the wrapper our class before we start to use it.
		MonadoView::staticInitClass((jclass)clazz.object().getHandle());
		std::unique_ptr<android_custom_surface> ret = std::make_unique<android_custom_surface>();

		// the 0 is to avoid this being considered "temporary" and to
		// create a global ref.
		ret->monadoViewClass = jni::Class((jclass)clazz.object().getHandle(), 0);

		if (ret->monadoViewClass.isNull()) {
			U_LOG_E("monadoViewClass was null");
			return nullptr;
		}

		std::string clazz_name = ret->monadoViewClass.getName();
		if (clazz_name != MonadoView::getFullyQualifiedTypeName()) {
			U_LOG_E("Unexpected class name: %s", clazz_name.c_str());
			return nullptr;
		}

		Context ctx = Context((jobject)context);
		Context displayContext;
		int32_t type = 0;
		// Not focusable
		int32_t flags =
		    WindowManager_LayoutParams::FLAG_FULLSCREEN() | WindowManager_LayoutParams::FLAG_NOT_FOCUSABLE();

		if (android_globals_is_instance_of_activity(android_globals_get_vm(), context)) {
			displayContext = ctx;
			type = WindowManager_LayoutParams::TYPE_APPLICATION();
		} else {
			// Out of process mode, determine which display should be used.
			DisplayManager dm = DisplayManager(ctx.getSystemService(Context::DISPLAY_SERVICE()));
			Display display = dm.getDisplay(display_id);
			displayContext = ctx.createDisplayContext(display);
			type = WindowManager_LayoutParams::TYPE_APPLICATION_OVERLAY();
		}

		WindowManager_LayoutParams lp = WindowManager_LayoutParams::construct(type, flags);
		ret->monadoView = MonadoView::attachToWindow(displayContext, ret.get(), lp);

		return ret.release();
	} catch (std::exception const &e) {

		U_LOG_E(
		    "Could not start attaching our custom surface to activity: "
		    "%s",
		    e.what());
		return nullptr;
	}
}

void
android_custom_surface_destroy(struct android_custom_surface **ptr_custom_surface)
{
	if (ptr_custom_surface == NULL) {
		return;
	}
	struct android_custom_surface *custom_surface = *ptr_custom_surface;
	if (custom_surface == NULL) {
		return;
	}
	delete custom_surface;
	*ptr_custom_surface = NULL;
}

ANativeWindow *
android_custom_surface_wait_get_surface(struct android_custom_surface *custom_surface, uint64_t timeout_ms)
{
	SurfaceHolder surfaceHolder{};
	try {
		surfaceHolder = custom_surface->monadoView.waitGetSurfaceHolder(timeout_ms);

	} catch (std::exception const &e) {
		// do nothing right now.
		U_LOG_E(
		    "Could not wait for our custom surface: "
		    "%s",
		    e.what());
		return nullptr;
	}

	if (surfaceHolder.isNull()) {
		return nullptr;
	}
	auto surf = surfaceHolder.getSurface();
	if (surf.isNull()) {
		return nullptr;
	}
	return ANativeWindow_fromSurface(jni::env(), surf.object().makeLocalReference());
}

bool
android_custom_surface_get_display_metrics(struct _JavaVM *vm,
                                           void *context,
                                           struct xrt_android_display_metrics *out_metrics)
{
	jni::init(vm);

	try {
		auto clazz = loadClassFromRuntimeApk((jobject)context, MonadoView::getFullyQualifiedTypeName());
		if (clazz.isNull()) {
			U_LOG_E("Could not load class '%s' from package '%s'", MonadoView::getFullyQualifiedTypeName(),
			        XRT_ANDROID_PACKAGE);
			return false;
		}

		// Teach the wrapper our class before we start to use it.
		MonadoView::staticInitClass((jclass)clazz.object().getHandle());

		jni::Object displayMetrics = MonadoView::getDisplayMetrics(Context((jobject)context));
		//! @todo implement non-deprecated codepath for api 30+
		float displayRefreshRate = MonadoView::getDisplayRefreshRate(Context((jobject)context));
		if (displayRefreshRate == 0.0) {
			displayRefreshRate = 60.0f;
		}

		*out_metrics = {.width_pixels = displayMetrics.get<int>("widthPixels"),
		                .height_pixels = displayMetrics.get<int>("heightPixels"),
		                .density_dpi = displayMetrics.get<int>("densityDpi"),
		                .density = displayMetrics.get<float>("xdpi"),
		                .scaled_density = displayMetrics.get<float>("ydpi"),
		                .xdpi = displayMetrics.get<float>("density"),
		                .ydpi = displayMetrics.get<float>("scaledDensity"),
		                .refresh_rate = displayRefreshRate};
		return true;
	} catch (std::exception const &e) {
		U_LOG_E("Could not get display metrics: %s", e.what());
		return false;
	}
}

bool
android_custom_surface_can_draw_overlays(struct _JavaVM *vm, void *context)
{
	jni::init(vm);
	return Settings::canDrawOverlays(Context{(jobject)context});
}