Allow image-based pens with dash patterns

src/map/mapsforge/style.cpp

@@ -241,11 +241,13 @@ void Style::area(QXmlStreamReader &reader, const QString &dir, qreal ratio,
 	reader.skipCurrentElement();
 }
 
-void Style::line(QXmlStreamReader &reader, qreal baseStrokeWidth,
-  const Rule &rule)
+void Style::line(QXmlStreamReader &reader, const QString &dir, qreal ratio,
+  qreal baseStrokeWidth, const Rule &rule)
 {
 	PathRender ri(rule, _paths.size() + _circles.size() + _hillShading.isValid());
 	const QXmlStreamAttributes &attr = reader.attributes();
+	QString file;
+	int height = 0, width = 0, percent = 100;
 	bool ok;
 
 	ri._brush = Qt::NoBrush;
@@ -309,6 +311,32 @@ void Style::line(QXmlStreamReader &reader, qreal baseStrokeWidth,
 		}
 	}
 
+	if (attr.hasAttribute("src"))
+		file = resourcePath(attr.value("src").toString(), dir);
+	if (attr.hasAttribute("symbol-height")) {
+		height = attr.value("symbol-height").toInt(&ok);
+		if (!ok || height < 0) {
+			reader.raiseError("invalid symbol-height value");
+			return;
+		}
+	}
+	if (attr.hasAttribute("symbol-width")) {
+		width = attr.value("symbol-width").toInt(&ok);
+		if (!ok || width < 0) {
+			reader.raiseError("invalid symbol-width value");
+			return;
+		}
+	}
+	if (attr.hasAttribute("symbol-percent")) {
+		percent = attr.value("symbol-percent").toInt(&ok);
+		if (!ok || percent < 0) {
+			reader.raiseError("invalid symbol-percent value");
+			return;
+		}
+	}
+	if (!file.isNull())
+		ri._img = image(file, width, height, percent, ratio);
+
 	if (ri.rule()._type == Rule::AnyType || ri.rule()._type == Rule::WayType)
 		_paths.append(ri);
 
@@ -549,7 +577,7 @@ void Style::rule(QXmlStreamReader &reader, const QString &dir,
 		else if (reader.name() == QLatin1String("area"))
 			area(reader, dir, ratio, baseStrokeWidth, r);
 		else if (reader.name() == QLatin1String("line"))
-			line(reader, baseStrokeWidth, r);
+			line(reader, dir, ratio, baseStrokeWidth, r);
 		else if (reader.name() == QLatin1String("circle"))
 			circle(reader, baseStrokeWidth, r);
 		else if (reader.name() == QLatin1String("pathText")) {
@@ -852,11 +880,11 @@ QList<const Style::Symbol*> Style::areaSymbols(int zoom) const
 
 QPen Style::PathRender::pen(int zoom) const
 {
-	if (_strokeColor.isValid()) {
+	if (!_img.isNull() || _strokeColor.isValid()) {
 		qreal width = (_scale > None && zoom >= 12)
 		  ? pow(1.5, zoom - 12) * _strokeWidth : _strokeWidth;
-		QPen p(QBrush(_strokeColor), width, Qt::SolidLine, _strokeCap,
-		  _strokeJoin);
+		QBrush brush = _img.isNull() ? QBrush(_strokeColor) : QBrush(_img);
+		QPen p(brush, width, Qt::SolidLine, _strokeCap, _strokeJoin);
 		if (!_strokeDasharray.isEmpty()) {
 			QVector<qreal>pattern(_strokeDasharray);
 			for (int i = 0; i < _strokeDasharray.size(); i++) {

src/map/mapsforge/style.h

@@ -173,6 +173,7 @@ public:
 		QVector<qreal> _strokeDasharray;
 		Qt::PenCapStyle _strokeCap;
 		Qt::PenJoinStyle _strokeJoin;
+		QImage _img;
 		QBrush _brush;
 		bool _area, _curve;
 		Scale _scale;
@@ -320,7 +321,8 @@ private:
 	  const Rule &parent);
 	void area(QXmlStreamReader &reader, const QString &dir, qreal ratio,
 	  qreal baseStrokeWidth, const Rule &rule);
-	void line(QXmlStreamReader &reader, qreal baseStrokeWidth, const Rule &rule);
+	void line(QXmlStreamReader &reader, const QString &dir, qreal ratio,
+	  qreal baseStrokeWidth, const Rule &rule);
 	void circle(QXmlStreamReader &reader, qreal baseStrokeWidth,
 	  const Rule &rule);
 	void hillshading(QXmlStreamReader &reader, const QSet<QString> &cats);