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diff --git a/docs/06_Component_Documentation/11_Unified_HMI.md b/docs/06_Component_Documentation/11_Unified_HMI.md index f908215..2b054b0 100644 --- a/docs/06_Component_Documentation/11_Unified_HMI.md +++ b/docs/06_Component_Documentation/11_Unified_HMI.md @@ -5,61 +5,104 @@ title: Unified HMI ## Introduction -This document describes the design and usage of the **Unified HMI**, which is a common platform technology for UX innovation in integrated cockpit by flexible information display on multiple displays of various applications. Applications can be rendered to any display via a unified virtual display. +This document describes the design and usage of the **Unified HMI**, which is a `Software-Defined` display virtualization platform based on VirtIO GPU tecnology. Unified HMI allows for flexible development of the entire cockpit and cabin UI/UX, across multiple displays, independent of hardware and OS configuration. Applications can be rendered to any display via a unified virtual display. + + + +## Unified HMI frameworks + +Unified HMI consists of two main components: + +1. Remote VirtIO GPU Device(RVGPU)：Render apps remotely in different SoCs. +2. Distributed Display Framework(DDFW)：Flexible layout control of apps across multiple displays. + + ### Remote Virtio GPU (RVGPU) -The RVGPU rendering engine, operating on a client-server model, creates 3D rendering commands on a client device and transmits them to a server device via the network, where the server-side device performs GPU-based rendering and displays the results. The meta-rvgpu currently supports x86, Raspberry Pi 4, and Renesas Boards platforms. +RVGPU is a client-server based rendering engine, which allows to render 3D on one device (client) and display it via network on another device (server) + +RVGPU consists of three repositories on Github: + +1. [remote-virtio-gpu](https://github.com/unified-hmi/remote-virtio-gpu): Main framework of RVGPU. +2. [virio-loopback-driver](https://github.com/unified-hmi/virtio-loopback-driver): Capture the drawing commands for VirtIO GPU and transfer them to the RVGPU framework. +3. [rvgpu-wlproxy](https://github.com/unified-hmi/rvgpu-wlproxy): Apply applications that operate on the Wayland Protocol, including Flutter apps, to RVGPU. + +### Distributed Display Framework (DDFW) + +DDFW provides essential services for managing distributed display applications. This framework is designed to work with a variety of hardware and software configurations, making it a versatile choice for developers looking to create scalable and robust display solutions. + +As shown in the figure below, DDFW maps multiple cockpit physical displays, into a single large virtual screen. +By placing applications on the virtual screen, you can control the layout of applications, across multiple displays. + + + +DDFW consists of three repositories on Github: + +1. [ucl-tools](https://github.com/unified-hmi/ucl-tools): Unified Clustering Tools (UCL), launch applications for multiple platforms and manage execution order and survival. +2. [ula-tools](https://github.com/unified-hmi/ula-tools): Unified Layout Tools (ULA), application layout for virtual displays on virtual screen (mapped from physical displays). +3. [uhmi-ivi-wm](https://github.com/unified-hmi/uhmi-ivi-wm): Apply ivi-layer and ivi-surface layouts to the screen using the layout design output by ula-tools. -### RVGPU Architecture +### Json settings - +To run ULA, three Json files are required. + +1. virtual-screen-def.json: Execution environment such as display and node (SoCs/VMs/PCs) informations. Please put this file on all related host. + + +2. app.json: Application execution information which can also take a sender/receiver relationship. Please put this file on one of the sender/receiver or a host that canbe communicate with them via network. + + +3. initial-vscreen.json: application layout information such as position and size. Please put this file on one of the sender/receiver or a host that canbe communicate with them via network. + + +Json files need to be created correctly for your execution environment. ## How to Build -Follow the [AGL documentation](https://docs.automotivelinux.org/en/master/#01_Getting_Started/02_Building_AGL_Image/01_Build_Process_Overview/) for the build process, and set up the "[Initializing Your Build Environment](https://docs.automotivelinux.org/en/master/#01_Getting_Started/02_Building_AGL_Image/04_Initializing_Your_Build_Environment/)" section as described below to enable the AGL feature 'agl-rvgpu'. For example: +Follow the [AGL documentation](https://docs.automotivelinux.org/en/master/#01_Getting_Started/02_Building_AGL_Image/01_Build_Process_Overview/) for the build process, and set up the "[Initializing Your Build Environment](https://docs.automotivelinux.org/en/master/#01_Getting_Started/02_Building_AGL_Image/04_Initializing_Your_Build_Environment/)" section as described below to enable the AGL feature 'agl-uhmi'. + +For example: ``` $ cd $AGL_TOP/master -$ source ./meta-agl/scripts/aglsetup.sh -m qemux86-64 -b qemux86-64 agl-demo agl-devel agl-rvgpu +$ source ./meta-agl/scripts/aglsetup.sh -m qemux86-64 -b qemux86-64 agl-demo agl-devel agl-uhmi ``` + After adding the feature, execute the command: ``` $ bitbake <image_name> ``` -**Note**: The operation has been confirmed with the **agl-ivi-demo-qt**. If you wish to specify a different `<image_name>` other than agl-ivi-demo-qt, create a file named `<image_name>.bbappend` in the directory -``` -$AGL_TOP/master/meta-agl-devel/meta-uhmi/meta-rvgpu/recipes-platform/images -``` -, and then add the following line to the file: +To add RVGPU and DDFW to the build images, please add the packagegroup that enable RVGPU(packagegroup-rvgpu) and DDFW(packagegroup-ddfw) to the installation target using the following command. ``` -IMAGE_INSTALL:append = " packagegroup-rvgpu" +$ echo 'IMAGE_INSTALL:append = " packagegroup-rvgpu packagegroup-ddfw"' >> conf/local.conf ``` +**Note**: RVGPU and DDFW can each be used independently. If you wish to use them individually, please add only one of the packagegroups to the installation target. -After making this change, you will need to execute the following commands: - +After adding the feature, execute the command: ``` -$ cd $AGL_TOP/master -$ source agl-init-build-env $ bitbake <image_name> -``` +``` +Replace the `<image_name>` with the appropriate values you want. We have confirmed the operation with the **agl-image-weston**. -## How to Setup and Boot +## How to setup and boot -For Environment setup instructions for each platform, refer to the following link in the AGL Documentation. -[Building for x86(Emulation and Hardware)](https://docs.automotivelinux.org/en/master/#01_Getting_Started/02_Building_AGL_Image/07_Building_for_x86_%28Emulation_and_Hardware%29/) -[Building for Raspberry Pi 4](https://docs.automotivelinux.org/en/master/#01_Getting_Started/02_Building_AGL_Image/08_Building_for_Raspberry_Pi_4/) -[Building for Supported Renesas Boards](https://docs.automotivelinux.org/en/master/#01_Getting_Started/02_Building_AGL_Image/09_Building_for_Supported_Renesas_Boards/) +For Environment setup instructions for each platform, refer to the following links in the AGL Documentation: +[Building for x86(Emulation and Hardware)](https://docs.automotivelinux.org/en/master/#01_Getting_Started/02_Building_AGL_Image/06_Building_the_AGL_Image/02_Building_for_x86_%28Emulation_and_Hardware%29/) +[Building for Raspberry Pi 4](https://docs.automotivelinux.org/en/master/#01_Getting_Started/02_Building_AGL_Image/06_Building_the_AGL_Image/03_Building_for_Raspberry_Pi_4/) +[Building for Supported Renesas Boards](https://docs.automotivelinux.org/en/master/#01_Getting_Started/02_Building_AGL_Image/06_Building_the_AGL_Image/04_Building_for_Supported_Renesas_Boards/) -For Raspberry Pi 4 and Supported Renesas Boards, refer to the above URL for boot methods. -For x86 emulation (qemu), network bridge is required to enable communication with other devices when using RVGPU. Here’s an example procedure for your reference. +For Raspberry Pi 4 and Supported Renesas Boards, refer to the above URL for boot methods. +For x86 emulation (qemu), network bridge is required to enable communication with other devices when using RVGPU. + +Here’s an example procedure for your reference. ``` $ sudo ip link add <bridge_name> type bridge $ sudo ip addr add <IP address> dev <bridge_name> $ sudo ip link set dev <interface> master <bridge_name> $ sudo ip link set dev <bridge_name> up ``` -Replace the placeholders with the appropriate values: +Replace the placeholders with the appropriate values: - `<bridge_name>`: You can assign any name, for example: `br0` - `<IP_address>`: Enter an available IP address, for example: `192.168.0.100/24` - `<interface>`: Specify the network interface, for example: `eth0` @@ -68,7 +111,7 @@ To enable the use of the bridge, create or append /etc/qemu directory and /etc/q ``` allow <bridge_name> ``` -Make sure /etc/qemu/ has 755 permissions. +Make sure /etc/qemu/ has 755 permissions. Create the following bash file named **run_qemu_bridge.sh** in any `<WORKDIR>`. ``` #!/bin/bash @@ -88,78 +131,337 @@ qemu-system-x86_64 -enable-kvm -m 2048 \ -netdev bridge,br=$BRIDGE_NAME,id=net0 \ -serial mon:stdio -serial null \ -soundhw hda \ - -append 'root=/dev/vda rw console=ttyS0,115200n8 fstab=no' + -append 'root=/dev/vda swiotlb=65536 rw console=ttyS0,115200n8 fstab=no' ``` Save the file and run the following to start QEMU. ``` -sudo <WORKDIR>/run_qemu_bridge.sh <build_directory>/tmp/deploy/images/qemux86-64/bzImage <build_directory>/tmp/deploy/images/qemux86-64/agl-ivi-demo-qt-qemux86-64.ext4 +sudo <WORKDIR>/run_qemu_bridge.sh <build_directory>/tmp/deploy/images/qemux86-64/bzImage <build_directory>/tmp/deploy/images/qemux86-64/agl-image-weston-qemux86-64.rootfs.ext4 ``` -When QEMU boot, assign an IP address. For example: +When QEMU boot, you can log in to qemu on the terminal where you executed above command, so please assign an IP address there. + +For example: ``` -ifconfig <your environment> 192.168.0.10 netmask 255.255.255.0 +ifconfig <your environment> 192.168.0.100 netmask 255.255.255.0 ``` -## How to run RVGPU remotely -Prepare two images, one as the Sender and the other as the Receiver. -It is necessary for the Sender and Receiver to be within the same network. +## How to use Unified HMI on AGL + +In the following verification procedure, it is assumed that two SoCs or Virtual Machines, are each connected to a Full HD display, with the displays, arranged side by side as shown in the figure. + +In the following sections, introducing the steps to run Unified HMI frameworks on the `agl-image-weston` image. + + + +### Environment settings (for all hosts) -**Receiver side** +To utilize Unified HMI, you need to set up each image with a distinct hostname and static IP address, and ensure that ivi-shell is running using the wayland-ivi-extension. Please note that the following configurations are examples and should be adapted to fit your specific network environment. + +#### Run weston with ivi-shell + +Before setting unique hostnames and configuring static IP addresses, it is essential to start Weston with ivi-shell since DDFW controls the layout of applications using ivi-shell. To initialize ivi-shell, follow these steps: + +First, please create the following content as /etc/xdg/weston/weston_ivi-shell.ini ``` -$ export XDG_RUNTIME_DIR=/run/user/<your_UID> -$ rvgpu-renderer -b <your_Area>@0,0 -p <Port_Number> & +[core] +shell=ivi-shell.so +modules=ivi-controller.so +require-input=false + +[output] +name=HDMI-A-1 +mode=1920x1080@60 + +[output] +name=HDMI-A-2 +mode=1920x1080@60 + +[output] +name=HDMI-A-3 +mode=1920x1080@60 + +[output] +name=DSI-1 +mode=1920x1080@60 + +[output] +name=DSI-2 +mode=1920x1080@60 + +[output] +name=DP-1 +mode=1920x1080@60 + +[output] +name=Virtual-1 +mode=1920x1080 + +[output] +name=Virtual-2 +mode=1920x1080 + +[output] +name=VGA-1 +mode=1920x1080 + +[output] +name=VGA-2 +mode=1920x1080 + +[ivi-shell] +ivi-input-module=ivi-input-controller.so +#ivi-client-name=/usr/bin/simple-weston-client +bkgnd-surface-id=1000000 +bkgnd-color=0xFF000000 ``` -Replace the placeholders with the appropriate values: -- `<your_UID>`: Specify according to your environment, for example:1001 -- `<your_Area>`: Enter an usable area for example: 1080x1488 - With the following command, you can know the usable area. - ``` - $ journalctl | grep -i "usable area" - # Example Output: - Nov 29 11:42:53 qemux86-64 agl-compositor[259]: [11:42:53.166] Usable area: 1080x1488+0,216 - ``` -- `<Port_Number>`: Enter an available port number, for example: 55555 +Next, to start Weston with the configuration created above, please execute the following command. +``` +ln -sf /etc/xdg/weston/weston_ivi-shell.ini /etc/xdg/weston/weston.ini +systemctl restart weston +``` +**Note**: Even after the launch of the ivi-shell is complete, the screen remains black and nothing is displayed until the application is shown. -**Sender side** -Create the following shell script **run_remote_app.sh** in any `<WORKDIR>` for a smooth experience. +#### Configuration to run Unified HMI frameworks on launched weston. + +By setting XDG_RUNTIME_DIR=/run/user/<your_UID> and WAYLAND_DISPLAY=<your_WAYLAND_DISPLAY> in /lib/systemd/system/uhmi-ivi-wm.service, you can display the applications launched by Unified HMI on Weston. + +Please execute `$ls /run/user/` in your environment to check <your_UID>. +Additionally, when Weston is launched, <your_WAYLAND_DISPLAY> will be generated under /run/user/<your_UID>, so please check that as well. + +e.g. In agl-image-weston, <your_UID> is set to 200 and <your_WAYLAND_DISPLAY> is set to wayland-1. Please create **/etc/default/uhmi-ivi-wm** as follows and set correct valiables: ``` -#!/bin/bash +XDG_RUNTIME_DIR=/run/user/200 +WAYLAND_DISPLAY=wayland-1 +``` + +#### Set Unique Hostnames -export XDG_RUNTIME_DIR=/tmp -export LD_LIBRARY_PATH=/usr/lib/mesa-virtio +Edit the `/etc/hostname` file on each image to set a unique hostname. Here are the suggested hostnames for the first two images: -# ------------- -# launch app -# ------------- -$@ +- **For the first image:** +``` +echo "agl-host0" | tee /etc/hostname +``` +- **For the second image:** +``` +echo "agl-host1" | tee /etc/hostname ``` -Save the file and run the following to start weston. +#### Assign Static IP Addresses +Configure a static IP address for each image by editing the `/etc/systemd/network/wired.network` file. If this file does not exist, please create a new one. Use the following template and replace `<IP_address>` and `<Netmask>` with your network's specific settings: + +```ini +[Match] +KernelCommandLine=!root=/dev/nfs +Name=eth* en* + +[Network] +Address=<IP_address>/<Netmask> ``` -$ rvgpu-proxy -s 1080x1488@0,0 -n <IP_address_of_Receiver>:<Port_Number> & -$ <WORKDIR>/run_remote_app.sh weston --backend drm-backend.so -Swayland-0 --seat=seat_virtual -i 0 & -``` -Replace the placeholders with the appropriate values: -- `<Port_Number>`: Port set in the renderer. +Here is how you might configure the static IP addresses for the first two images: -After completing these steps, the Weston screen from the Sender will be transferred and displayed on the Receiver using rvgpu-proxy and rvgpu-renderer. You can verify that everything is functioning properly by launching wayland applications on the Sender side, such as: +- **For the first image:** ``` -$ weston-simple-egl -f -``` +[Match] +KernelCommandLine=!root=/dev/nfs +Name=eth* en* -You can also verify the touch or keyboard operation support of the RVGPU by using app such as +[Network] +Address=192.168.0.100/24 ``` -$ weston-smoke -$ weston-editor +- **For the second image:** ``` -**Note**: There are known issues with mouse, such as the cursor becoming invisible and occasional flickering of a green screen. +[Match] +KernelCommandLine=!root=/dev/nfs +Name=eth* en* + +[Network] +Address=192.168.0.101/24 +``` + +Once the hostname and IP addresses settings are complete, please reboot to reflect these settings. + +### Demo Image + +In this documentation, we will use the demo environment prepared as shown in the following diagram. In this diagram, there are two hosts, agl-host0 and agl-host1, each have a display output with a resolusion of 1920x1080(FullHD), arranged in order from left to right as agl-host0 and then agl-host1. + + + +Here, agl-host0 will act as the sender, and the application will be executed on agl-host0. Both agl-host0 (itself) and agl-host1 will render it remotely as receivers, enabling the display of the application across two displays. + +In the following sections, specify where to carry out the steps for agl-host0 or agl-host1 for clarity. However, in practice, the UCL and ULA commands can be executed on one of any sender/receiver or any other host. + +### Customizing Virtual Screen Definitions (both agl-host0/agl-host1) + +Adjust the `/etc/uhmi-framework/virtual-screen-def.json` file to match your environment. In this demo, please create that Json file as shown in below: + +``` +{ + "virtual_screen_2d": { + "size": {"virtual_w": 3840, "virtual_h": 1080}, + "virtual_displays": [ + {"vdisplay_id": 0, "disp_name": "AGL_SCREEN0", "virtual_x": 0, "virtual_y": 0, "virtual_w": 1920, "virtual_h": 1080}, + {"vdisplay_id": 1, "disp_name": "AGL_SCREEN1", "virtual_x": 1920, "virtual_y": 0, "virtual_w": 1920, "virtual_h": 1080} + ] + }, + "virtual_screen_3d": {}, + "real_displays": [ + {"node_id": 0, "vdisplay_id": 0, "pixel_w": 1920, "pixel_h": 1080, "rdisplay_id": 0}, + {"node_id": 1, "vdisplay_id": 1, "pixel_w": 1920, "pixel_h": 1080, "rdisplay_id": 0} + ], + "node": [ + {"node_id": 0, "hostname": "agl-host0", "ip": "192.168.0.100"}, + {"node_id": 1, "hostname": "agl-host1", "ip": "192.168.0.101"} + ], + "distributed_window_system": { + "window_manager": {}, + "framework_node": [ + {"node_id": 0, "ula": {"debug": false, "debug_port": 8080, "port": 10100}, "ucl": {"port": 7654}}, + {"node_id": 1, "ula": {"debug": false, "debug_port": 8080, "port": 10100}, "ucl": {"port": 7654}} + ] + } +} +``` + +Please put the same virtual-screen-def.json on both agl-host0/agl-host1. + +Be sure to update the virtual_w, virtual_h, virtual_x, virtual_y, pixel_w, pixel_h, hostname, and ip fields to accurately reflect your specific network configuration. + +### Restarting Services (both agl-host0/agl-host1) +Once you have prepared the virtual-screen-def.json file and configured the system, you need to restart the system or the following system services for the changes to take effect in all hosts: +``` +systemctl restart uhmi-ivi-wm +systemctl restart ula-node +systemctl restart ucl-launcher +``` + +After restarting these services, your system should be ready to use the DDFW commands with the new configuration. + +### Remote rendering of apps with RVGPU using UCL + +UCL provides a distributed launch feature for applications using RVGPU. By preparing a app.json configuration, you can enable the launch of applications across multiple devices in a distributed environment. + +#### Setting Up for Application Launch using UCL (agl-host0) + +To facilitate the distributed launch of an application with UCL, you need to create a app.json file on agl-host0 that specifies the details of the application and how it should be executed on the sender and receiver nodes. + +Example of `app.json`: +``` +{ + "format_v1": { + "command_type" : "remote_virtio_gpu", + "appli_name" : "weston-simple-egl", + "sender" : { + "launcher" : "agl-host0", + "command" : "/usr/bin/ucl-virtio-gpu-wl-send", + "frontend_params" : { + "scanout_x" : 0, + "scanout_y" : 0, + "scanout_w" : 1920, + "scanout_h" : 1080, + "server_port" : 33445 + }, + "appli" : "/usr/bin/weston-simple-egl -s 1920x1080", + "env" : "LD_LIBRARY_PATH=/usr/lib/mesa-virtio" + }, + "receivers" : [ + { + "launcher" : "agl-host0", + "command" : "/usr/bin/ucl-virtio-gpu-wl-recv", + "backend_params" : { + "ivi_surface_id" : 101000, + "scanout_x" : 0, + "scanout_y" : 0, + "scanout_w" : 1920, + "scanout_h" : 1080, + "listen_port" : 33445, + "initial_screen_color" : "0x33333333" + }, + "env" : "XDG_RUNTIME_DIR=/run/user/200 WAYLAND_DISPLAY=wayland-1" + }, + { + "launcher" : "agl-host1", + "command" : "/usr/bin/ucl-virtio-gpu-wl-recv", + "backend_params" : { + "ivi_surface_id" : 101000, + "scanout_x" : 0, + "scanout_y" : 0, + "scanout_w" : 1920, + "scanout_h" : 1080, + "listen_port" : 33445, + "initial_screen_color" : "0x33333333" + }, + "env" : "XDG_RUNTIME_DIR=/run/user/200 WAYLAND_DISPLAY=wayland-1" + } + ] + } +} +``` + +In this example, the application weston-simple-egl is configured to launch on the sender node `agl-host0` and display its output on the receiver nodes `agl-host0` and `agl-host1`. The `scanout_x`, `scanout_y`, `scanout_w`, `scanout_h` parameters define the size of the window, while `server_port` and `listen_port` ensure the communication between sender and receivers. + +#### Launching the Application (agl-host0) + +Once the app.json file is ready, you can execute the application across the distributed system by piping the JSON content to the `ucl-distrib-com` command along with the path to the `virtual-screen-def.json` file: + +``` +cat app.json | ucl-distrib-com /etc/uhmi-framework/virtual-screen-def.json +``` + +This command will read the configuration and initiate the application launch process, distributing the workload as defined in the JSON files. + +Please ensure that the app.json file you create is correctly formatted and contains the appropriate parameters for your specific use case. + +### Layout application by ULA + +ULA allows for the definition of physical displays on a virtual screen and provides the ability to apply layout settings such as position and size to applications launched using the UCL Framework. + +#### Creating a Layout Configuration File (agl-host0) + +To define the layout for your applications, you need to create a `initial_vscreen.json` file, with the necessary configuration details on agl-host0. This file will contain the layout settings that specify how applications should be positioned and sized within the virtual screen. Here is an example of what the contents of `initial_vscreen.json` file might look like: + +``` +{ + "command": "initial_vscreen", + "vlayer": [ + { + "VID": 1010000, + "coord": "global", + "virtual_w": 1920, "virtual_h": 1080, + "vsrc_x": 0, "vsrc_y": 0, "vsrc_w": 1920, "vsrc_h": 1080, + "vdst_x": 960, "vdst_y": 0, "vdst_w": 1920, "vdst_h": 1080, + "vsurface": [ + { + "VID": 101000, + "pixel_w": 1920, "pixel_h": 1080, + "psrc_x": 0, "psrc_y": 0, "psrc_w": 1920, "psrc_h": 1080, + "vdst_x": 0, "vdst_y": 0, "vdst_w": 1920, "vdst_h": 1080 + } + ] + } + ] +} +``` + +In this example, the application is renderd across the right half of the agl-host0 and the left half of agl-host1 display. + +- **vlayer** defines a virtual layer that represents a group of surfaces within the virtual screen. Each layer has a unique Virtual ID (VID) and can contain multiple surfaces. The layer's source (`vsrc_x`, `vsrc_y`, `vsrc_w`, `vsrc_h`) and destination (`vdst_x`, `vdst_y`, `vdst_w`, `vdst_h`) coordinates determine where and how large the layer appears on the virtual screen. + +- **vsurface** defines individual surfaces within the virtual layer. Each surface also has a VID, and its pixel dimensions (`pixel_w`, `pixel_h`) represent the actual size of the content. The source (`psrc_x`, `psrc_y`, `psrc_w`, `psrc_h`) and destination (`vdst_x`, `vdst_y`, `vdst_w`, `vdst_h`) coordinates determine the portion of the content to display and its location within the layer. + +#### Applying the Layout Configuration (agl-host0) + +Once you have created the `initial_vscreen.json` file with your layout configuration, you can apply it to your system using the following command: + +``` +cat initial_vscreen.json | ula-distrib-com +``` + +Executing this command will process the configuration from the JSON file and apply the layout settings to the virtual screen. As a result, the applications will appear in the specified positions and sizes according to the layout defined in the Json file. -**Appendix** -- By building the RVGPU on Ubuntu, it is possible to enable bidirectional remote rendering between the agl-ivi-demo-qt and Ubuntu. -For the build procedure on Ubuntu, see the following URL: https://github.com/unified-hmi/remote-virtio-gpu -The figure below shows an example where Ubuntu is used as the Sender and AGL as the Receiver, running RVGPU. +Ensure that `initial_vscreen.json` file you create accurately reflects the desired layout for your applications and display setup. -
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