From ae7924a01cb58526df7ba22948a28f27fc4d9b65 Mon Sep 17 00:00:00 2001
From: Werner Almesberger <werner@almesberger.net>
Date: Sun, 31 Jul 2016 22:40:16 -0300
Subject: [PATCH] sch2fig/Makefile (png, pngref): add regression test image
 also for Cairo-PNG

---
 sch2fig/Makefile | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/sch2fig/Makefile b/sch2fig/Makefile
index 87d78f0..17dffe2 100644
--- a/sch2fig/Makefile
+++ b/sch2fig/Makefile
@@ -22,7 +22,7 @@ LIBS = -lm `pkg-config --libs cairo`
 
 include ../common/Makefile.c-common
 
-.PHONY:		test neo900 sch test diff view newref
+.PHONY:		test neo900 sch test testref png pngref diff view newref
 
 all::		$(NAME)
 
@@ -44,8 +44,19 @@ test:		$(NAME)
 testref:
 		./$(NAME) test.lib test.sch | fig2dev -L png -m 2 >ref.png
 
+png:
+		./$(NAME) test.lib test.sch -- cairo
+		[ ! -r pngref.png ] || \
+		    compare -metric AE pngref.png test.png _diff.png || \
+		    qiv -t -R -D _diff.png pngref.png test.png
+
+pngref:
+		./$(NAME) test.lib test.sch -- cairo
+		mv test.png pngref.png
+
 clean::
 		rm -f out.fig _out.png _diff.png
+		rm -f test.png
 
 #----- Render Neo900 schematics -----------------------------------------------