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Use a checkerboard background in svg cache tests

(cherry-picked from 3f733e7)
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nyalldawson committed Apr 2, 2018
1 parent 78b7181 commit 4fca5319a628b27f7d62d3ede026b52724e98d66
@@ -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)
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