Add HiDPI support for Plymouth boot

debian/postinst

@@ -12,3 +12,10 @@ esac
 ln -s /usr/share/apparmor/extra-profiles/bwrap-userns-restrict /etc/apparmor.d/ || true
 
 #DEBHELPER#
+
+# Plymouth HiDPI support
+
+if [ -x /bin/systemctl ] || [ -x /usr/bin/systemctl ]; then
+    systemctl preset plymouth-hidpi.service || true
+    systemctl enable plymouth-hidpi.service || true
+fi

meson.build

@@ -49,3 +49,6 @@ subdir('skel')
 
 # GTK settings
 subdir('gtk')
+
+# Plymouth HiDPI support
+subdir('plymouth')

plymouth/meson.build

@@ -0,0 +1,11 @@
+# Configure Plymouth for HiDPI screens
+install_data(
+    'plymouth-hidpi.sh',
+    install_dir: '/usr/local/bin',
+    install_mode: 'rwxr-xr-x'
+)
+
+install_data(
+    'plymouth-hidpi.service',
+    install_dir: '/etc/systemd/system'
+)

plymouth/plymouth-hidpi.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=Configure Plymouth for HiDPI screens
+After=graphical.target
+Requires=graphical.target
+
+[Service]
+Type=oneshot
+Environment="DISPLAY=:0"
+ExecStart=/usr/local/bin/plymouth-hidpi.sh
+ExecStartPost=/bin/bash -c 'if [ $? -eq 0 ]; then systemctl disable plymouth-hidpi.service; rm -f /etc/systemd/system/plymouth-hidpi.service /usr/local/bin/plymouth-hidpi.sh; fi'
+
+[Install]
+WantedBy=graphical.target
+

plymouth/plymouth-hidpi.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+CONFIG_FILE="/etc/plymouth/plymouthd.conf"
+HIDPI_THRESHOLD=180 # Min DPI of a HiDPI screen
+
+TIMEOUT=300  # Set the maximum wait time in seconds
+ELAPSED=0
+
+# Wait until Gala is running or timeout occurs
+while ! pgrep -x "gala" > /dev/null && [ $ELAPSED -lt $TIMEOUT ]; do
+    sleep 1
+    ((ELAPSED++))
+done
+
+if [ $ELAPSED -ge $TIMEOUT ]; then
+    echo "Timeout reached while waiting for Gala to start" >&2
+    exit 1
+fi
+
+# Get current DPI
+export DISPLAY=":0"
+DPI=$(xrdb -query | grep dpi | awk '{print $2}')
+
+create_config() {
+    cat <<EOF > "$CONFIG_FILE"
+[Daemon]
+DeviceScale=1
+EOF
+    logger -t plymouth-hidpi "Created new config: '$CONFIG_FILE' with HiDPI setting"
+}
+
+apply_hidpi_setting() {
+    if [[ "$DPI" -ge "$HIDPI_THRESHOLD" ]]; then
+        if [[ ! -f "$CONFIG_FILE" ]]; then
+            create_config
+
+            # Apply the changes
+            update-initramfs -u
+            logger -t plymouth-hidpi "Updated initramfs after HiDPI change"
+        else
+            logger -t plymouth-hidpi "HiDPI config file already exists, no changes made"
+        fi
+    else
+        logger -t plymouth-hidpi "Skipped HiDPI settings (DPI: $DPI, Threshold: $HIDPI_THRESHOLD)"
+    fi
+}
+
+apply_hidpi_setting