Merge pull request #6285 from tudorbarascu/dpi

fix server issue for double devicePixelRatio leading to DPI requests with decimals

src/server/services/wms/qgswmsparameters.cpp

@@ -685,9 +685,9 @@ namespace QgsWms
     return value( ParameterName::DPI ).toString();
   }
 
-  int QgsWmsParameters::dpiAsInt() const
+  double QgsWmsParameters::dpiAsDouble() const
   {
-    return toInt( ParameterName::DPI );
+    return toDouble( ParameterName::DPI );
   }
 
   QString QgsWmsParameters::version() const

src/server/services/wms/qgswmsparameters.h

@@ -892,7 +892,7 @@ namespace QgsWms
        * \returns dpi parameter
        * \throws QgsBadRequestException
        */
-      int dpiAsInt() const;
+      double dpiAsDouble() const;
 
       /**
        * Returns TEMPLATE parameter or an empty string if not defined.

src/server/services/wms/qgswmsrenderer.cpp

@@ -1046,7 +1046,7 @@ namespace QgsWms
     double OGC_PX_M = 0.00028; // OGC reference pixel size in meter, also used by qgis
     int dpm = 1 / OGC_PX_M;
     if ( !mWmsParameters.dpi().isEmpty() )
-      dpm = mWmsParameters.dpiAsInt() / 0.0254;
+      dpm = mWmsParameters.dpiAsDouble() / 0.0254;
 
     image->setDotsPerMeterX( dpm );
     image->setDotsPerMeterY( dpm );

tests/src/python/test_qgsserver_wms_getmap.py

@@ -184,6 +184,25 @@ class TestQgsServerWMSGetMap(QgsServerTestBase):
         r, h = self._result(self._execute_request(qs))
         self._img_diff_error(r, h, "WMS_GetMap_Basic4")
 
+    def test_wms_getmap_dpi(self):
+        qs = "?" + "&".join(["%s=%s" % i for i in list({
+            "MAP": urllib.parse.quote(self.projectPath),
+            "SERVICE": "WMS",
+            "VERSION": "1.1.1",
+            "REQUEST": "GetMap",
+            "LAYERS": "Country",
+            "STYLES": "",
+            "FORMAT": "image/png",
+            "BBOX": "-16817707,-4710778,5696513,14587125",
+            "HEIGHT": "500",
+            "WIDTH": "500",
+            "CRS": "EPSG:3857",
+            "DPI": "112.5"
+        }.items())])
+
+        r, h = self._result(self._execute_request(qs))
+        self._img_diff_error(r, h, "WMS_GetMap_Basic5")
+
     def test_wms_getmap_invalid_parameters(self):
         # height should be an int
         qs = "?" + "&".join(["%s=%s" % i for i in list({