Add MLT's Pillar Echo effect

data/effects/CMakeLists.txt

@@ -28,6 +28,7 @@ mute.xml
 normalise.xml
 oldfilm.xml
 pan_zoom.xml
+pillar_echo.xml
 obscure.xml
 region.xml
 rotation.xml

data/effects/pillar_echo.xml

+<!DOCTYPE kpartgui>
+<effect tag="pillar_echo" id="pillar_echo">
+	<name>Pillar Echo</name>
+	<description>Create an echo effect (blur) outside of an area of interest.</description>
+	<author>Meltytech, LLC</author>
+	<parameter type="animatedrect" name="rect" default="25% 0% 50% 100%" fixed="1" opacity="false">
+		<name>Rectangle</name>
+	</parameter>
+	<parameter type="constant" name="blur" max="50" min="0" default="4" suffix="%">
+		<name>Blur</name>
+	</parameter>
+</effect>

src/assets/model/assetparametermodel.cpp

@@ -544,7 +544,7 @@ ParamType AssetParameterModel::paramTypeFromStr(const QString &type)
         return ParamType::Switch;
     } else if (type == QLatin1String("simplekeyframe")) {
         return ParamType::KeyframeParam;
-    } else if (type == QLatin1String("animatedrect")) {
+    } else if (type == QLatin1String("animatedrect") || type == QLatin1String("rect")) {
         return ParamType::AnimatedRect;
     } else if (type == QLatin1String("geometry")) {
         return ParamType::Geometry;
@@ -628,8 +628,30 @@ QVariant AssetParameterModel::parseAttribute(const ObjectId &owner, const QStrin
             .replace(QLatin1String("%height"), QString::number(height))
             .replace(QLatin1String("%out"), QString::number(out))
             .replace(QLatin1String("%fade"), QString::number(frame_duration));
-
-        if (type == ParamType::Double || type == ParamType::Hidden) {
+        if (type == ParamType::AnimatedRect && attribute == QLatin1String("default")) {
+            if (content.contains(QLatin1Char('%'))) {
+                // This is a generic default like: "25% 0% 50% 100%". Parse values
+                QStringList numbers = content.split(QLatin1Char(' '));
+                content.clear();
+                int ix = 0;
+                for ( QString &val : numbers) {
+                    if (val.endsWith(QLatin1Char('%'))) {
+                        val.chop(1);
+                        double n = val.toDouble()/100.;
+                        if (ix %2 == 0) {
+                            n *= width;
+                        } else {
+                            n *= height;
+                        }
+                        ix++;
+                        content.append(QString("%1 ").arg(qRound(n)));
+                    } else {
+                        content.append(QString("%1 ").arg(val));
+                    }
+                }
+            }
+        }
+        else if (type == ParamType::Double || type == ParamType::Hidden) {
             // Use a Mlt::Properties to parse mathematical operators
             Mlt::Properties p;
             p.set("eval", content.prepend(QLatin1Char('@')).toLatin1().constData());