Use a checkerboard background in svg cache tests

(cherry-picked from 3f733e7)
qgis · Apr 2, 2018 · 4fca531 · 4fca531
1 parent 78b7181
commit 4fca531
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Showing 3 changed files with 10 additions and 3 deletions.
diff --git a/tests/src/python/test_qgssvgcache.py b/tests/src/python/test_qgssvgcache.py
@@ -19,9 +19,9 @@
 import threading
 import http.server
 from qgis.PyQt.QtCore import QDir
-from qgis.PyQt.QtGui import QColor
+from qgis.PyQt.QtGui import QColor, QImage, QPainter
 
-from qgis.core import (QgsSvgCache, QgsRenderChecker, QgsApplication)
+from qgis.core import (QgsSvgCache, QgsRenderChecker, QgsApplication, QgsMultiRenderChecker)
 from qgis.testing import start_app, unittest
 from utilities import unitTestDataPath
 
@@ -84,7 +84,14 @@ def imageCheck(self, name, reference_image, image):
         self.report += "<h2>Render {}</h2>\n".format(name)
         temp_dir = QDir.tempPath() + '/'
         file_name = temp_dir + 'svg_' + name + ".png"
-        image.save(file_name, "PNG")
+
+        output_image = QImage(image.size(), QImage.Format_RGB32)
+        QgsMultiRenderChecker.drawBackground(output_image)
+        painter = QPainter(output_image)
+        painter.drawImage(0, 0, image)
+        painter.end()
+
+        output_image.save(file_name, "PNG")
         checker = QgsRenderChecker()
         checker.setControlPathPrefix("svg_cache")
         checker.setControlName("expected_" + reference_image)

diff --git a/tests/testdata/control_images/svg_cache/expected_bad_svg/expected_bad_svg.png b/tests/testdata/control_images/svg_cache/expected_bad_svg/expected_bad_svg.png
diff --git a/...s/testdata/control_images/svg_cache/expected_remote_svg/expected_remote_svg.png b/...s/testdata/control_images/svg_cache/expected_remote_svg/expected_remote_svg.png