Improved performance

src/pbf.cpp

@@ -1,22 +1,24 @@
-#include <QByteArray>
-#include <QImage>
-#include <QPainter>
-#include <QDebug>
-#include <QVariantHash>
-#include "vector_tile.pb.h"
-#include "style.h"
-#include "tile.h"
 #include "pbf.h"
 
-
-#define MOVE_TO    1
-#define LINE_TO    2
-#define CLOSE_PATH 7
-
 #define POLYGON vector_tile::Tile_GeomType_POLYGON
 #define LINESTRING vector_tile::Tile_GeomType_LINESTRING
 #define POINT vector_tile::Tile_GeomType_POINT
 
+#define MOVE_TO    1
+#define LINE_TO    2
+#define CLOSE_PATH 7
+
+
+static inline qint32 zigzag32decode(quint32 value)
+{
+	return static_cast<qint32>((value >> 1u) ^ static_cast<quint32>(
+	  -static_cast<qint32>(value & 1u)));
+}
+
+static inline QPoint parameters(quint32 v1, quint32 v2)
+{
+	return QPoint(zigzag32decode(v1), zigzag32decode(v2));
+}
 
 static QVariant value(const vector_tile::Tile_Value &val)
 {
@@ -38,100 +40,37 @@ static QVariant value(const vector_tile::Tile_Value &val)
 		return QVariant();
 }
 
-class Feature
+const QVariant *PBF::Feature::value(const QString &key) const
 {
-public:
-	Feature() : _data(0) {}
-	Feature(const vector_tile::Tile_Feature *data, const QVector<QString> *keys,
-	  const QVector<QVariant> *values) : _data(data)
-	{
-		for (int i = 0; i < data->tags_size(); i = i + 2)
-			_tags.insert(keys->at(data->tags(i)), values->at(data->tags(i+1)));
+	const KeyHash &keys(_layer->keys());
+	KeyHash::const_iterator it(keys.find(key));
+	if (it == keys.constEnd())
+		return 0;
 
-		switch (data->type()) {
-			case POLYGON:
-				_tags.insert("$type", QVariant("Polygon"));
-				break;
-			case LINESTRING:
-				_tags.insert("$type", QVariant("LineString"));
-				break;
-			case POINT:
-				_tags.insert("$type", QVariant("Point"));
-				break;
-			default:
-				break;
-		}
-	}
+	const google::protobuf::RepeatedField<google::protobuf::uint32>
+	  &tags(_data->tags());
+	google::protobuf::uint32 index = *it;
+	for (int i = 0; i < _data->tags_size(); i = i + 2)
+		if (tags[i] == index)
+			return &(_layer->values().at(tags[i+1]));
 
-	const QVariantHash &tags() const {return _tags;}
-	const vector_tile::Tile_Feature *data() const {return _data;}
-
-private:
-	QVariantHash _tags;
-	const vector_tile::Tile_Feature *_data;
-};
-
-static bool cmp(const Feature &f1, const Feature &f2)
-{
-	return f1.data()->id() < f2.data()->id();
+	return 0;
 }
 
-class Layer
+QPainterPath PBF::Feature::path(const QSizeF &factor) const
 {
-public:
-	Layer(const vector_tile::Tile_Layer *data) : _data(data)
-	{
-		QVector<QString> keys;
-		QVector<QVariant> values;
-
-		for (int i = 0; i < data->keys_size(); i++)
-			keys.append(QString::fromStdString(data->keys(i)));
-		for (int i = 0; i < data->values_size(); i++)
-			values.append(value(data->values(i)));
-
-		_features.reserve(data->features_size());
-		for (int i = 0; i < data->features_size(); i++)
-			_features.append(Feature(&(data->features(i)), &keys, &values));
-		qSort(_features.begin(), _features.end(), cmp);
-	}
-
-	const QVector<Feature> &features() const {return _features;}
-	const vector_tile::Tile_Layer *data() const {return _data;}
-
-private:
-	const vector_tile::Tile_Layer *_data;
-	QVector<Feature> _features;
-};
-
-static inline qint32 zigzag32decode(quint32 value)
-{
-	return static_cast<qint32>((value >> 1u) ^ static_cast<quint32>(
-	  -static_cast<qint32>(value & 1u)));
-}
-
-static inline QPoint parameters(quint32 v1, quint32 v2)
-{
-	return QPoint(zigzag32decode(v1), zigzag32decode(v2));
-}
-
-static void drawFeature(const Feature &feature, const Style *style,
-  int styleLayer, const QSizeF &factor, Tile &tile)
-{
-	if (!style->match(tile.zoom(), styleLayer, feature.tags()))
-		return;
-
 	QPoint cursor;
 	QPainterPath path;
 
-	for (int i = 0; i < feature.data()->geometry_size(); i++) {
-		quint32 g = feature.data()->geometry(i);
+	for (int i = 0; i < _data->geometry_size(); i++) {
+		quint32 g = _data->geometry(i);
 		unsigned cmdId = g & 0x7;
 		unsigned cmdCount = g >> 3;
 
 		if (cmdId == MOVE_TO) {
 			for (unsigned j = 0; j < cmdCount; j++) {
-				QPoint offset = parameters(feature.data()->geometry(i+1),
-				  feature.data()->geometry(i+2));
+				QPoint offset = parameters(_data->geometry(i+1),
+				  _data->geometry(i+2));
 				i += 2;
 				cursor += offset;
 				path.moveTo(QPointF(cursor.x() * factor.width(),
@@ -139,8 +78,8 @@ static void drawFeature(const Feature &feature, const Style *style,
 			}
 		} else if (cmdId == LINE_TO) {
 			for (unsigned j = 0; j < cmdCount; j++) {
-				QPoint offset = parameters(feature.data()->geometry(i+1),
-				  feature.data()->geometry(i+2));
+				QPoint offset = parameters(_data->geometry(i+1),
+				  _data->geometry(i+2));
 				i += 2;
 				cursor += offset;
 				path.lineTo(QPointF(cursor.x() * factor.width(),
@@ -152,60 +91,35 @@ static void drawFeature(const Feature &feature, const Style *style,
 		}
 	}
 
-	if (path.elementCount())
-		style->drawFeature(tile, styleLayer, path, feature.tags());
+	return path;
 }
 
-static void drawLayer(const Layer &layer, const Style *style, int styleLayer,
-  Tile &tile)
+PBF::Layer::Layer(const vector_tile::Tile_Layer *data) : _data(data)
 {
-	if (layer.data()->version() > 2)
-		return;
+	_keys.reserve(data->keys_size());
+	for (int i = 0; i < data->keys_size(); i++)
+		_keys.insert(QString::fromStdString(data->keys(i)), i);
+	_values.reserve(data->values_size());
+	for (int i = 0; i < data->values_size(); i++)
+		_values.append(value(data->values(i)));
 
-	QSizeF factor(tile.size().width() / tile.scale().x() /
-	  (qreal)layer.data()->extent(), tile.size().height() / tile.scale().y()
-	  / (qreal)layer.data()->extent());
-
-	tile.painter().save();
-	style->setupLayer(tile, styleLayer);
-	for (int i = 0; i < layer.features().size(); i++)
-		drawFeature(layer.features().at(i), style, styleLayer, factor, tile);
-	tile.painter().restore();
+	_features.reserve(data->features_size());
+	for (int i = 0; i < data->features_size(); i++)
+		_features.append(Feature(&(data->features(i)), this));
+	qSort(_features.begin(), _features.end());
 }
 
-bool PBF::render(const QByteArray &data, int zoom, const Style *style,
-  const QPointF &scale, QImage *image)
+PBF::PBF(const vector_tile::Tile &tile)
 {
-	vector_tile::Tile tile;
-	if (!tile.ParseFromArray(data.constData(), data.size())) {
-		qCritical() << "Invalid tile protocol buffer data";
-		return false;
-	}
-
-	Tile t(image, zoom, scale);
-
-	style->drawBackground(t);
-
-	// Prepare source layers
-	QMap<QString, Layer> layers;
 	for (int i = 0; i <  tile.layers_size(); i++) {
 		const vector_tile::Tile_Layer &layer = tile.layers(i);
-		QString name(QString::fromStdString(layer.name()));
-		if (style->sourceLayers().contains(name))
-			layers.insert(name, Layer(&layer));
+		_layers.insert(QString::fromStdString(layer.name()), new Layer(&layer));
 	}
-
-	// Process source layers in order of style layers
-	for (int i = 0; i < style->sourceLayers().size(); i++) {
-		QMap<QString, Layer>::const_iterator it = layers.find(
-		  style->sourceLayers().at(i));
-		if (it == layers.constEnd())
-			continue;
-
-		drawLayer(*it, style, i, t);
-	}
-
-	t.text().render(&t.painter());
-
-	return true;
+}
+
+PBF::~PBF()
+{
+	for (QHash<QString, Layer*>::iterator it = _layers.begin();
+	  it != _layers.end(); it++)
+		delete *it;
 }

src/pbf.h

@@ -1,15 +1,67 @@
 #ifndef PBF_H
 #define PBF_H
 
-class QByteArray;
-class QImage;
-class Style;
-class QPointF;
+#include <QVariant>
+#include <QVector>
+#include <QHash>
+#include <QPainterPath>
+#include "vector_tile.pb.h"
 
-namespace PBF
+
+typedef QHash<QString, google::protobuf::uint32> KeyHash;
+
+class PBF
 {
-	bool render(const QByteArray &data, int zoom, const Style *style,
-	  const QPointF &scale, QImage *render);
-}
+public:
+	class Layer;
+
+	class Feature
+	{
+	public:
+		Feature() : _data(0), _layer(0) {}
+		Feature(const vector_tile::Tile_Feature *data, const Layer *layer)
+		  : _data(data), _layer(layer) {}
+
+		const QVariant *value(const QString &key) const;
+		vector_tile::Tile_GeomType type() const {return _data->type();}
+		QPainterPath path(const QSizeF &factor) const;
+
+		friend bool operator<(const Feature &f1, const Feature &f2);
+
+	private:
+		const vector_tile::Tile_Feature *_data;
+		const Layer *_layer;
+	};
+
+	class Layer
+	{
+	public:
+
+		Layer(const vector_tile::Tile_Layer *data);
+
+		const QVector<Feature> &features() const {return _features;}
+		const QVector<QVariant> &values() const {return _values;}
+		const KeyHash &keys() const {return _keys;}
+		const vector_tile::Tile_Layer *data() const {return _data;}
+
+	private:
+		const vector_tile::Tile_Layer *_data;
+		QVector<Feature> _features;
+		QVector<QVariant> _values;
+		KeyHash _keys;
+	};
+
+
+	PBF(const vector_tile::Tile &tile);
+	~PBF();
+
+	const QHash<QString, Layer*> &layers() const {return _layers;}
+
+private:
+	QHash<QString, Layer*> _layers;
+};
+
+inline bool operator<(const PBF::Feature &f1, const PBF::Feature &f2)
+  {return f1._data->id() < f2._data->id();}
 
 #endif // PBF_H

src/pbfhandler.cpp

@@ -1,8 +1,10 @@
 #include <QImage>
 #include <QIODevice>
 #include <QtEndian>
+#include <QDebug>
 #include "gzip.h"
-#include "pbf.h"
+#include "tile.h"
+#include "style.h"
 #include "pbfhandler.h"
 
 
@@ -61,6 +63,11 @@ bool PBFHandler::read(QImage *image)
 		ba = device()->readAll();
 	if (ba.isNull())
 		return false;
+	vector_tile::Tile data;
+	if (!data.ParseFromArray(ba.constData(), ba.size())) {
+		qCritical() << "Invalid PBF data";
+		return false;
+	}
 
 	bool ok;
 	int zoom = format().toInt(&ok);
@@ -71,8 +78,11 @@ bool PBFHandler::read(QImage *image)
 	  ? QPointF(_scaledSize.width() / TILE_SIZE, _scaledSize.height() / TILE_SIZE)
 	  : QPointF(1.0, 1.0);
 	*image = QImage(size, QImage::Format_ARGB32_Premultiplied);
+	Tile tile(image, ok ? zoom : -1, scale);
 
-	return PBF::render(ba, ok ? zoom : -1, _style, scale, image);
+	_style->render(data, tile);
+
+	return true;
 }
 
 bool PBFHandler::supportsOption(ImageOption option) const

src/style.cpp

@@ -10,9 +10,22 @@
 #include "color.h"
 #include "font.h"
 #include "tile.h"
+#include "pbf.h"
 #include "style.h"
 
 
+static vector_tile::Tile_GeomType geometryType(const QString &str)
+{
+	if (str == "Point")
+		return vector_tile::Tile_GeomType_POINT;
+	else if (str == "LineString")
+		return vector_tile::Tile_GeomType_LINESTRING;
+	else if (str == "Polygon")
+		return vector_tile::Tile_GeomType_POLYGON;
+	else
+		return vector_tile::Tile_GeomType_UNKNOWN;
+}
+
 Style::Layer::Filter::Filter(const QJsonArray &json)
   : _type(Unknown), _not(false)
 {
@@ -27,9 +40,15 @@ Style::Layer::Filter::Filter(const QJsonArray &json)
 	if (type == "==") {
 		if (json.size() != 3)
 			INVALID_FILTER(json);
-		_type = EQ;
-		_kv = QPair<QString, QVariant>(json.at(1).toString(),
-		  json.at(2).toVariant());
+		if (json.at(1).toString() == "$type") {
+			_type = GeometryType;
+			_kv = QPair<QString, QVariant>(QString(),
+			  QVariant(geometryType(json.at(2).toString())));
+		} else {
+			_type = EQ;
+			_kv = QPair<QString, QVariant>(json.at(1).toString(),
+			  json.at(2).toVariant());
+		}
 	} else if (type == "!=") {
 		if (json.size() != 3)
 			INVALID_FILTER(json);
@@ -98,45 +117,68 @@ Style::Layer::Filter::Filter(const QJsonArray &json)
 		INVALID_FILTER(json);
 }
 
-bool Style::Layer::Filter::match(const QVariantHash &tags) const
+bool Style::Layer::Filter::match(const PBF::Feature &feature) const
 {
+	const QVariant *v;
+
 	switch (_type) {
 		case None:
 			return true;
 		case EQ:
-			return tags.value(_kv.first) == _kv.second;
+			if (!(v = feature.value(_kv.first)))
+				return false;
+			else
+				return *v == _kv.second;
 		case NE:
-			return tags.value(_kv.first) != _kv.second;
+			if (!(v = feature.value(_kv.first)))
+				return true;
+			else
+				return *v != _kv.second;
 		case GT:
-			return tags.value(_kv.first) > _kv.second;
+			if (!(v = feature.value(_kv.first)))
+				return false;
+			else
+				return *v > _kv.second;
 		case GE:
-			return tags.value(_kv.first) >= _kv.second;
+			if (!(v = feature.value(_kv.first)))
+				return false;
+			else
+				return *v >= _kv.second;
 		case LT:
-			return tags.value(_kv.first) < _kv.second;
+			if (!(v = feature.value(_kv.first)))
+				return false;
+			else
+				return *v < _kv.second;
 		case LE:
-			return tags.value(_kv.first) <= _kv.second;
+			if (!(v = feature.value(_kv.first)))
+				return false;
+			else
+				return *v <= _kv.second;
 		case In:
-			return _set.contains(tags.value(_kv.first).toString()) ^ _not;
+			if (!(v = feature.value(_kv.first)))
+				return _not;
+			else
+				return _set.contains((*v).toString()) ^ _not;
 		case Has:
-			return tags.contains(_kv.first) ^ _not;
+			return (feature.value(_kv.first) ? true : false) ^ _not;
 		case All:
-			for (int i = 0; i < _filters.size(); i++) {
-				if (!_filters.at(i).match(tags))
+			for (int i = 0; i < _filters.size(); i++)
+				if (!_filters.at(i).match(feature))
 					return false;
-			}
 			return true;
 		case Any:
-			for (int i = 0; i < _filters.size(); i++) {
-				if (_filters.at(i).match(tags))
+			for (int i = 0; i < _filters.size(); i++)
+				if (_filters.at(i).match(feature))
 					return true;
-			}
 			return false;
+		case GeometryType:
+			return feature.type() == _kv.second.toUInt();
 		default:
 			return false;
 	}
 }
 
-QString Style::Layer::Template::value(int zoom, const QVariantHash &tags) const
+QString Style::Layer::Template::value(int zoom, const PBF::Feature &feature) const
 {
 	QRegExp rx = QRegExp("\\{[^\\}]*\\}");
 	QString text(_field.value(zoom));
@@ -150,8 +192,8 @@ QString Style::Layer::Template::value(int zoom, const QVariantHash &tags) const
 	}
 	for (int i = 0; i < keys.size(); i++) {
 		const QString &key = keys.at(i);
-		const QVariant val = tags.value(key);
-		text.replace(QString("{%1}").arg(key), val.toString());
+		const QVariant *val = feature.value(key);
+		text.replace(QString("{%1}").arg(key), val ? val->toString() : "");
 	}
 
 	return text;
@@ -428,7 +470,7 @@ Style::Layer::Layer(const QJsonObject &json)
 		_paint = Paint(json["paint"].toObject());
 }
 
-bool Style::Layer::match(int zoom, const QVariantHash &tags) const
+bool Style::Layer::match(int zoom, const PBF::Feature &feature) const
 {
 	if (zoom >= 0) {
 		if (_minZoom > 0 && zoom < _minZoom)
@@ -437,7 +479,7 @@ bool Style::Layer::match(int zoom, const QVariantHash &tags) const
 			return false;
 	}
 
-	return _filter.match(tags);
+	return _filter.match(feature);
 }
 
 void Style::Layer::setPathPainter(Tile &tile, const Sprites &sprites) const
@@ -472,13 +514,13 @@ void Style::Layer::setTextProperties(Tile &tile) const
 }
 
 void Style::Layer::addSymbol(Tile &tile, const QPainterPath &path,
-  const QVariantHash &tags, const Sprites &sprites) const
+  const PBF::Feature &feature, const Sprites &sprites) const
 {
-	QString text = _layout.text(tile.zoom(), tags);
+	QString text = _layout.text(tile.zoom(), feature);
 	if (text.isEmpty())
 		return;
 
-	QString icon = _layout.icon(tile.zoom(), tags);
+	QString icon = _layout.icon(tile.zoom(), feature);
 	tile.text().addLabel(text, sprites.icon(icon), path);
 }
 
@@ -525,9 +567,6 @@ bool Style::load(const QString &fileName)
 				_layers.append(Layer(layers[i].toObject()));
 	}
 
-	for (int i = 0; i < _layers.size(); i++)
-		_sourceLayers.append(_layers.at(i).sourceLayer());
-
 	QDir styleDir = QFileInfo(fileName).absoluteDir();
 	loadSprites(styleDir, "sprite.json", "sprite.png", _sprites);
 #ifdef ENABLE_HIDPI
@@ -548,25 +587,12 @@ const Sprites &Style::sprites(const QPointF &scale) const
 #endif // ENABLE_HIDPI
 }
 
-void Style::setupLayer(Tile &tile, int layer) const
+void Style::setupLayer(Tile &tile, const Layer &layer) const
 {
-	const Layer &sl = _layers.at(layer);
-
-	if (sl.isSymbol())
-		sl.setTextProperties(tile);
-	else if (sl.isPath())
-		sl.setPathPainter(tile, sprites(tile.scale()));
-}
-
-void Style::drawFeature(Tile &tile, int layer, const QPainterPath &path,
-  const QVariantHash &tags) const
-{
-	const Layer &sl = _layers.at(layer);
-
-	if (sl.isPath())
-		tile.painter().drawPath(path);
-	else if (sl.isSymbol())
-		sl.addSymbol(tile, path, tags, sprites(tile.scale()));
+	if (layer.isSymbol())
+		layer.setTextProperties(tile);
+	else if (layer.isPath())
+		layer.setPathPainter(tile, sprites(tile.scale()));
 }
 
 void Style::drawBackground(Tile &tile) const
@@ -587,3 +613,52 @@ void Style::drawBackground(Tile &tile) const
 	//tile.painter().setPen(Qt::red);
 	//tile.painter().drawRect(rect);
 }
+
+void Style::drawFeature(const PBF::Feature &feature, const Layer &layer,
+  Tile &tile, const QSizeF &factor) const
+{
+	if (!layer.match(tile.zoom(), feature))
+		return;
+
+	QPainterPath path(feature.path(factor));
+	if (!path.elementCount())
+		return;
+
+	if (layer.isPath())
+		tile.painter().drawPath(path);
+	else if (layer.isSymbol())
+		layer.addSymbol(tile, path, feature, sprites(tile.scale()));
+}
+
+void Style::drawLayer(const PBF::Layer &pbfLayer, const Layer &styleLayer,
+  Tile &tile) const
+{
+	if (pbfLayer.data()->version() > 2)
+		return;
+
+	QSizeF factor(tile.size().width() / tile.scale().x() /
+	  (qreal)pbfLayer.data()->extent(), tile.size().height() / tile.scale().y()
+	  / (qreal)pbfLayer.data()->extent());
+
+	tile.painter().save();
+	setupLayer(tile, styleLayer);
+	for (int i = 0; i < pbfLayer.features().size(); i++)
+		drawFeature(pbfLayer.features().at(i), styleLayer, tile, factor);
+	tile.painter().restore();
+}
+
+void Style::render(const PBF &data, Tile &tile) const
+{
+	drawBackground(tile);
+
+	for (int i = 0; i < _layers.size(); i++) {
+		QHash<QString, PBF::Layer*>::const_iterator it = data.layers().find(
+		  _layers.at(i).sourceLayer());
+		if (it == data.layers().constEnd())
+			continue;
+
+		drawLayer(**it, _layers.at(i), tile);
+	}
+
+	tile.text().render(&tile.painter());
+}

src/style.h

@@ -11,6 +11,7 @@
 #include <QPen>
 #include <QBrush>
 #include <QFont>
+#include "pbf.h"
 #include "config.h"
 #include "text.h"
 #include "function.h"
@@ -29,16 +30,7 @@ public:
 	Style(QObject *parent = 0) : QObject(parent) {}
 
 	bool load(const QString &fileName);
-
-	const QStringList &sourceLayers() const
-	  {return _sourceLayers;}
-
-	bool match(int zoom, int layer, const QVariantHash &tags) const
-	  {return _layers.at(layer).match(zoom, tags);}
-	void drawBackground(Tile &tile) const;
-	void setupLayer(Tile &tile, int layer) const;
-	void drawFeature(Tile &tile, int layer, const QPainterPath &path,
-	  const QVariantHash &tags) const;
+	void render(const PBF &data, Tile &tile) const;
 
 private:
 	class Layer {
@@ -51,11 +43,11 @@ private:
 		bool isBackground() const {return (_type == Background);}
 		bool isSymbol() const {return (_type == Symbol);}
 
-		bool match(int zoom, const QVariantHash &tags) const;
+		bool match(int zoom, const PBF::Feature &feature) const;
 		void setPathPainter(Tile &tile, const Sprites &sprites) const;
 		void setTextProperties(Tile &tile) const;
 		void addSymbol(Tile &tile, const QPainterPath &path,
-		  const QVariantHash &tags, const Sprites &sprites) const;
+		  const PBF::Feature &feature, const Sprites &sprites) const;
 
 	private:
 		enum Type {
@@ -71,13 +63,13 @@ private:
 			Filter() : _type(None) {}
 			Filter(const QJsonArray &json);
 
-			bool match(const QVariantHash &tags) const;
+			bool match(const PBF::Feature &feature) const;
 		private:
 			enum Type {
 				None, Unknown,
 				EQ, NE, GE, GT, LE, LT,
 				All, Any,
-				In, Has
+				In, Has, GeometryType
 			};
 
 			Type _type;
@@ -91,7 +83,7 @@ private:
 		public:
 			Template() {}
 			Template(const FunctionS &str) : _field(str) {}
-			QString value(int zoom, const QVariantHash &tags) const;
+			QString value(int zoom, const PBF::Feature &feature) const;
 
 		private:
 			FunctionS _field;
@@ -107,10 +99,10 @@ private:
 			  {return _textMaxWidth.value(zoom);}
 			qreal maxTextAngle(int zoom) const
 			  {return _textMaxAngle.value(zoom);}
-			QString text(int zoom, const QVariantHash &tags) const
-			  {return _text.value(zoom, tags).trimmed();}
-			QString icon(int zoom, const QVariantHash &tags) const
-			  {return _icon.value(zoom, tags);}
+			QString text(int zoom, const PBF::Feature &feature) const
+			  {return _text.value(zoom, feature).trimmed();}
+			QString icon(int zoom, const PBF::Feature &feature) const
+			  {return _icon.value(zoom, feature);}
 			QFont font(int zoom) const;
 			Qt::PenCapStyle lineCap(int zoom) const;
 			Qt::PenJoinStyle lineJoin(int zoom) const;
@@ -170,8 +162,14 @@ private:
 
 	const Sprites &sprites(const QPointF &scale) const;
 
+	void drawBackground(Tile &tile) const;
+	void setupLayer(Tile &tile, const Layer &layer) const;
+	void drawFeature(const PBF::Feature &feature, const Layer &layer,
+	  Tile &tile, const QSizeF &factor) const;
+	void drawLayer(const PBF::Layer &pbfLayer, const Layer &styleLayer,
+	  Tile &tile) const;
+
 	QVector<Layer> _layers;
-	QStringList _sourceLayers;
 	Sprites _sprites;
 #ifdef ENABLE_HIDPI
 	Sprites _sprites2x;