Pseudo-desktop mode using scrcpy

scrcpy-desktop-mode.sh

#!/bin/bash

show-help() {
  BASENAME=$(basename "$0")
  echo "Usage: $BASENAME [device-name] [optional-resolution] [optional-density]"
  exit 1
}

[[ $1 = "-h" || $1 = "--help" ]] && show-help

for i in adb scrcpy bc; do
  which $i >/dev/null 2>&1
  [[ $? -ne 0 ]] && \
    echo "Please download $i and add it into your path before running this script." && \
    exit 1
done

if [[ -z $1 ]]; then
  [[ $(adb devices | wc -l) != 3 ]] && \
    echo "Please connect an Android device via adb before running this script." && \
    echo "Ensure that only one Android device is connected, or specify the device" && \
    echo "name as a parameter when running this script." && \
    echo && \
    adb devices && \
    show-help
else
  adb connect $1 >/dev/null 2>&1
  DASH_S="-s"
  DEVICE=$1

  adb devices | grep -w $DEVICE > /dev/null || show-help
fi

[[ $(adb $DASH_S $DEVICE shell getprop ro.build.version.sdk) < 29 ]] && \
  echo "Sorry, desktop mode is only supported on Android 10 and up." && \
  exit 1

[[ $(adb $DASH_S $DEVICE shell settings get global enable_freeform_support) -ne 1 ]] && \
  adb $DASH_S $DEVICE shell settings put global enable_freeform_support 1

[[ $(adb $DASH_S $DEVICE shell settings get global force_desktop_mode_on_external_displays) -ne 1 ]] && \
  adb $DASH_S $DEVICE shell settings put global force_desktop_mode_on_external_displays 1 && \
  echo "Desktop mode enabled. Please reboot your device, then re-run this script." && \
  exit 1

if [[ -z $2 ]]; then
  RESOLUTION=$(xdpyinfo | grep dimensions | cut -d' ' -f 7)
else
  RESOLUTION=$2
fi

if [[ -z $3 ]]; then
  DENSITY=$(echo "$(xdpyinfo | grep resolution | cut -d' ' -f 7 | cut -d'x' -f 1)*1.6666667" | bc | cut -d'.' -f 1)
else
  DENSITY=$3
fi

adb $DASH_S $DEVICE shell settings put global overlay_display_devices $RESOLUTION/$DENSITY

sleep 3 && \
  echo && \
  echo "Be sure to close the scrcpy window first before disconnecting your device." && \
  echo "Press ALT+F inside the scrcpy window to toggle fullscreen." &

DISPLAY_ID=$(scrcpy $DASH_S $DEVICE -V error --display 65535 2>&1 | grep "\-\-display" | tail -n1 |  awk '$1=$1' | cut -d' ' -f1 | cut -d'=' -f2)
scrcpy $DASH_S $DEVICE --display $DISPLAY_ID

adb $DASH_S $DEVICE shell settings delete global overlay_display_devices >/dev/null 2>&1