From 1e517fcc4eb35f09b7f02f6843be361a62d20ed9 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Fri, 12 Oct 2018 22:08:01 +0100
Subject: [PATCH] Use ImageMagick for test stuff.

---
 test/test.cc | 18 ++++++++++++++++--
 test/wscript |  4 +++-
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/test/test.cc b/test/test.cc
index a3235eb62..c87f4e70b 100644
--- a/test/test.cc
+++ b/test/test.cc
@@ -46,6 +46,7 @@
 #include <asdcp/AS_DCP.h>
 #include <sndfile.h>
 #include <libxml++/libxml++.h>
+#include <Magick++.h>
 extern "C" {
 #include <libavformat/avformat.h>
 }
@@ -232,7 +233,17 @@ check_mxf_audio_file (boost::filesystem::path ref, boost::filesystem::path check
 void
 check_image (boost::filesystem::path ref, boost::filesystem::path check, double threshold)
 {
-	/* XXX */
+	using namespace MagickCore;
+
+	Magick::Image ref_image;
+	ref_image.read (ref.string ());
+	Magick::Image check_image;
+	check_image.read (check.string ());
+	/* XXX: this is a hack; we really want the ImageMagick call but GraphicsMagick doesn't have it;
+	   this may cause random test failures on platforms that use GraphicsMagick.
+	*/
+	double const dist = ref_image.compare(check_image, Magick::RootMeanSquaredErrorMetric);
+	BOOST_CHECK_MESSAGE (dist < threshold, ref << " differs from " << check << " " << dist);
 }
 
 void
@@ -408,7 +419,10 @@ wait_for_jobs ()
 void
 write_image (shared_ptr<const Image> image, boost::filesystem::path file, string format)
 {
-	/* XXX */
+	using namespace MagickCore;
+
+	Magick::Image m (image->size().width, image->size().height, format.c_str(), CharPixel, (void *) image->data()[0]);
+	m.write (file.string ());
 }
 
 void
diff --git a/test/wscript b/test/wscript
index cfa718307..8ef281dd7 100644
--- a/test/wscript
+++ b/test/wscript
@@ -30,11 +30,13 @@ def configure(conf):
                             int main() {}
                             """, msg = 'Checking for boost unit testing library', lib = 'boost_unit_test_framework%s' % boost_test_suffix, uselib_store = 'BOOST_TEST')
 
+    conf.check_cfg(package='ImageMagick++', args='--cflags --libs', uselib_store='MAGICK', mandatory=True)
+
 def build(bld):
     obj = bld(features='cxx cxxprogram')
     obj.name   = 'unit-tests'
     obj.uselib =  'BOOST_TEST BOOST_THREAD BOOST_FILESYSTEM BOOST_DATETIME SNDFILE SAMPLERATE DCP FONTCONFIG CAIROMM PANGOMM XMLPP '
-    obj.uselib += 'AVFORMAT AVFILTER AVCODEC AVUTIL SWSCALE SWRESAMPLE POSTPROC CXML SUB GLIB CURL SSH XMLSEC BOOST_REGEX ICU NETTLE '
+    obj.uselib += 'AVFORMAT AVFILTER AVCODEC AVUTIL SWSCALE SWRESAMPLE POSTPROC CXML SUB GLIB CURL SSH XMLSEC BOOST_REGEX ICU NETTLE MAGICK '
     if bld.env.TARGET_WINDOWS:
         obj.uselib += 'WINSOCK2 DBGHELP SHLWAPI MSWSOCK BOOST_LOCALE '
     obj.use    = 'libdcpomatic2'
-- 
2.30.2