From f9140bc53f44dc1c6a051e0fe43b61ca6e53940d Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@almesberger.net>
Date: Tue, 26 Jul 2016 18:35:51 -0300
Subject: [PATCH] sch2fig/misc.c (matrix_to_angle, matrix_is_mirrored): 1 0 0 1
 and 0 1 -1 0

Tentative support. Untested.
---
 sch2fig/misc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sch2fig/misc.c b/sch2fig/misc.c
index a946edc..820464a 100644
--- a/sch2fig/misc.c
+++ b/sch2fig/misc.c
@@ -37,6 +37,10 @@ unsigned matrix_to_angle(int m[6])
 		return 270;
 	if (eq(m, -1, 0, 0, -1))
 		return 0;
+	if (eq(m, 1, 0, 0, 1))	/* x-flipped */
+		return 180;
+	if (eq(m, 0, 1, -1, 0))	/* x-flipped, 90 deg */
+		return 90;
 	fprintf(stderr, "unrecognized matrix %d %d %d %d\n",
 	    m[1], m[2], m[4], m[5]);
 	exit(1);
@@ -56,6 +60,10 @@ bool matrix_is_mirrored(int m[6])
 
 	if (eq(m, -1, 0, 0, -1))
 		return 1;
+	if (eq(m, 1, 0, 0, 1))
+		return 1;
+	if (eq(m, 0, 1, -1, 0))
+		return 1;
 	assert(0);
 }