Merge branch 'brute_scaling' into 'master'

linux: Attempt to apply Avalonia scaling factor via environment pre-launch.

See merge request ryubing/ryujinx!1

distribution/linux/Ryujinx.sh

@@ -20,4 +20,40 @@ if command -v gamemoderun > /dev/null 2>&1; then
     COMMAND="$COMMAND gamemoderun"
 fi
 
+# Check if user already has a manual Avalonia scaling override or session type is x11.
+if [ -n "${AVALONIA_GLOBAL_SCALE_FACTOR-}" ] || [ "$XDG_SESSION_TYPE" = "x11" ]; then
+    echo "Scaling: Performed by environment, skipping." >&2
+else
+    # Query monitor config directly (GNOME), default display only.
+    if [[ "$(echo "$XDG_CURRENT_DESKTOP")" == "GNOME" && -f ~/.config/monitors.xml ]] then
+        echo -n 'Scaling: Monitor config located, querying scale...' >&2
+        SCALING="$(grep '<scale' ~/.config/monitors.xml -m 1 | cut -f2 -d">"|cut -f1 -d"<")"
+        SCALING="${SCALING##* }"
+        echo "found! Factor: ${SCALING}" >&2
+
+    # Fallback to X DPI query for others.
+    # Plasma handles this fine, GNOME will always round up e.g. 1.25 -> 2.00.
+    elif command -v xrdb >/dev/null; then
+        echo -n 'Scaling: Attempting to get scaling from X DPI value...' >&2
+        dpi="$(xrdb -get Xft.dpi)"
+        if [[ -n "${dpi}" ]]; then
+            SCALING=$(awk -vdpi="$dpi" 'BEGIN{print dpi/96}')
+        fi
+        echo "found! Factor: ${SCALING}"
+
+    # Query kscreen-doctor for Plasma as a fallback.
+    elif [[ "$(echo "$XDG_CURRENT_DESKTOP")" == "KDE" ]] && command -v kscreen-doctor >/dev/null; then
+        # gsub strips ANSI color codes from ksd output
+        SCALING=$(kscreen-doctor --outputs | awk '/Scale:/{gsub(/\x1b\[[0-9;]*m/,""); print $2; exit}')
+        echo "found! Factor: ${SCALING}"
+    fi
+
+    if [[ -z "${SCALING-}" || "${SCALING-}" == "0" ]]; then
+        echo 'Unset invalid scaling value' >&2
+        SCALING="1"
+    fi
+
+    COMMAND="$COMMAND AVALONIA_GLOBAL_SCALE_FACTOR=$SCALING"
+fi
+
 exec $COMMAND "$SCRIPT_DIR/$RYUJINX_BIN" "$@"