update tests images after change made to agg src_over in #1452, refs #1369

tests/data/good_maps/style_level_opacity_and_blur.xml

@@ -0,0 +1,24 @@
+<Map background-color="#fcc" srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over">
+    <!-- Asia -->
+    <Style name="style" image-filters="agg-stack-blur(4,4)">
+        <Rule>
+            <Filter>([REGION]=142)</Filter>
+            <PolygonSymbolizer fill="yellow"/>
+        </Rule>
+    </Style>
+    <!-- Not Asia -->
+    <Style name="style2" opacity=".5">
+        <Rule>
+            <Filter>([REGION]!=142)</Filter>
+            <PolygonSymbolizer fill="#fff"/>
+        </Rule>
+    </Style>
+    <Layer name="world" srs="+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over">
+        <StyleName>style</StyleName>
+        <StyleName>style2</StyleName>
+        <Datasource>
+            <Parameter name="file">../shp/world_merc</Parameter>
+            <Parameter name="type">shape</Parameter>
+        </Datasource>
+    </Layer>
+</Map>

tests/python_tests/compositing_test.py

@@ -145,6 +145,17 @@ def test_pre_multiply_status_of_map2():
     mapnik.render(m,im)
     eq_(validate_pixels_are_not_premultiplied(im),True)
 
+def test_style_level_opacity():
+    m = mapnik.Map(512,512)
+    mapnik.load_map(m,'../data/good_maps/style_level_opacity_and_blur.xml')
+    m.zoom_all()
+    im = mapnik.Image(512,512)
+    mapnik.render(m,im)
+    actual = '/tmp/mapnik-style-level-opacity.png'
+    expected = 'images/support/mapnik-style-level-opacity.png'
+    im.save(actual)
+    expected_im = mapnik.Image.open(expected)
+    eq_(im.tostring(),expected_im.tostring(), 'failed comparing actual (%s) and expected (%s)' % (actual,'tests/python_tests/'+ expected))
 
 if __name__ == "__main__":
     setup()