jovian-updater-logo-helper: Add support for BGRT

pkgs/jovian-updater-logo-helper/jovian-updater-logo-helper.sh

@@ -51,14 +51,84 @@ MAGICK_INVOCATION=(
 	"canvas:black[${image_width}x${image_height}!]"
 )
 
-MAGICK_INVOCATION+=(
-	# Add the logo
-	"$logo"
-	# Centered
-	-gravity center
-	# (This means 'add')
-	-composite
-)
+if [[ "$logo" == "--bgrt" ]]; then
+	# Status field described here:
+	#  - https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#boot-graphics-resource-table-bgrt
+	bgrt_rotation="$(( ($(cat /sys/firmware/acpi/bgrt/status) >> 1) & 2#11 ))"
+	bgrt_xoffset=$(cat /sys/firmware/acpi/bgrt/xoffset)
+	bgrt_yoffset=$(cat /sys/firmware/acpi/bgrt/yoffset)
+	bgrt_dimensions="$(magick identify /sys/firmware/acpi/bgrt/image  | cut -d' ' -f3)"
+	bgrt_height=${bgrt_dimensions#*x}
+	bgrt_width=${bgrt_dimensions%x*}
+
+	case "$bgrt_rotation" in
+	"$(( 2#00 ))")
+		bgrt_offset="+$((
+			bgrt_xoffset
+		))+$((
+			bgrt_yoffset
+		))"
+		bgrt_rotation="0"
+		;;
+	"$(( 2#01 ))") #  90
+		bgrt_offset="+$((
+			image_height - bgrt_height - bgrt_yoffset
+		))+$((
+			bgrt_xoffset
+		))"
+		bgrt_rotation="90"
+		;;
+	"$(( 2#10 ))") # 180
+		bgrt_offset="+$((
+			image_width - bgrt_width - bgrt_xoffset
+		))+$((
+			image_height - bgrt_height - bgrt_yoffset
+		))"
+		bgrt_rotation="180"
+		;;
+	"$(( 2#11 ))") # -90
+		bgrt_offset="+$((
+			bgrt_yoffset
+		))+$((
+			image_width - bgrt_width - bgrt_xoffset
+		))"
+		bgrt_rotation="-90"
+	;;
+	esac
+
+	MAGICK_INVOCATION+=(
+		# Put the canvas back into the panel native orientation.
+		-rotate -$(( display_rotation ))
+
+		# Add the BGRT (bmp image)
+		# Group operation so we don't operate on the canvas.
+		'('
+			# Load the image
+			"/sys/firmware/acpi/bgrt/image"
+
+			# Rotate the BGRT to its expected rotation for composition
+			-rotate $(( bgrt_rotation ))
+
+			# At its defined offset, again considering pre-composed rotation
+			-geometry "$bgrt_offset"
+		')'
+
+		# (This means 'add' for the previous image)
+		-composite
+
+		# Undo the native orientation we added back.
+		-rotate $(( display_rotation ))
+	)
+else
+	MAGICK_INVOCATION+=(
+		# Add the logo
+		"$logo"
+		# Centered
+		-gravity center
+		# (This means 'add')
+		-composite
+	)
+fi
 
 # Final fixups to the image
 MAGICK_INVOCATION+=(