From 8c94ca486138a5a07f67e0fa5c35073bc7f4ce3b Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@datawire.io>
Date: Fri, 17 May 2019 14:29:41 -0400
Subject: fix-dpi: Add a per-device DPI override

---
 .local/bin/fix-dpi | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/.local/bin/fix-dpi b/.local/bin/fix-dpi
index b700ea9..afcb4a1 100755
--- a/.local/bin/fix-dpi
+++ b/.local/bin/fix-dpi
@@ -45,14 +45,18 @@ usage() {
 	printf '  --render-dpi=<auto|auto-hwonly|DPI|XDPIxYDPI>\n'
 	printf '                  Specify what DPI applications should render\n'
 	printf '                  at (default: auto)\n'
+	printf '  --device-dpi=OUTPUT=<DPI|XDPIxYDPI>\n'
+	printf '                  Override the hardware-reported DPI for'
+	printf '                  the X11 output OUTPUT\n'
 }
 
 set -euE -o pipefail
-args=$(getopt -n "${0##*/}" -o 'hn' -l 'help,dry-run,render-dpi:' -- "$@") || errusage
+args=$(getopt -n "${0##*/}" -o 'hn' -l 'help,dry-run,render-dpi:,device-dpi:' -- "$@") || errusage
 eval "set -- $args"
 
 arg_dry_run=false
 arg_render_dpi=auto
+declare -A arg_device_dpi
 while (( $# > 0 )); do
 	case "$1" in
 		-h|--help)
@@ -77,6 +81,17 @@ while (( $# > 0 )); do
 			esac
 			shift 2
 			;;
+		--device-dpi)
+			if [[ "$2" != *=* ]]; then
+				errusage 'Invalid --device-dpi=%q' "$2"
+			fi
+			device=${2%=*}
+			dpi=${2##*=}
+			if ! arg_device_dpi["$device"]="$(sanitize "${dpi%%x*}" 2>/dev/null)x$(sanitize "${dpi#*x}" 2>/dev/null)"; then
+				errusage 'Invalid --device-dpi=%q' "$2"
+			fi
+			shift 2
+			;;
 		--)
 			shift
 			break
@@ -96,6 +111,9 @@ if [[ $arg_render_dpi == auto ]] || [[ $arg_render_dpi == auto-hwonly ]]; then
 		if [[ $arg_render_dpi == auto-hwonly ]] && [[ $source != X11-RandR-hw ]]; then
 			continue
 		fi
+		if [[ $source == X11-RandR-hw ]]; then
+			dpi=${arg_device_dpi["$item"]:-"$dpi"}
+		fi
 		arg_render_xdpi=$(max "$(round "${dpi%%x*}")" "$arg_render_xdpi")
 		arg_render_ydpi=$(max "$(round "${dpi#*x}")" "$arg_render_ydpi")
 	done <<<"$dpis"
@@ -116,6 +134,7 @@ fi
 		if [[ $source != X11-RandR-hw ]]; then
 			continue
 		fi
+		dpi=${arg_device_dpi["$item"]:-"$dpi"}
 		hw_xdpi="$(sanitize "${dpi%%x*}")"
 		hw_ydpi="$(sanitize "${dpi#*x}")"
 
-- 
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