Added support for HiDPI sprites

pbfplugin.qrc

@@ -3,5 +3,7 @@
 		<file>style/style.json</file>
 		<file>style/sprite.json</file>
 		<file>style/sprite.png</file>
+		<file>style/sprite@2x.json</file>
+		<file>style/sprite@2x.png</file>
 	</qresource>
 </RCC>

src/pbf.cpp

@@ -156,18 +156,20 @@ static void drawFeature(const Feature &feature, Style *style, int styleLayer,
 }
 
 static void drawLayer(const Layer &layer, Style *style, int styleLayer,
-  Tile &tile, const QPointF &scale)
+  Tile &tile)
 {
 	if (layer.data()->version() > 2)
 		return;
 
-	QSizeF factor(tile.size().width() / scale.x() / (qreal)layer.data()->extent(),
-	  tile.size().height() / scale.y() / (qreal)layer.data()->extent());
+	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();
 }
 
 bool PBF::render(const QByteArray &data, int zoom, Style *style,
@@ -192,8 +194,6 @@ bool PBF::render(const QByteArray &data, int zoom, Style *style,
 			layers.insert(name, Layer(&layer));
 	}
 
-	t.painter().save();
-
 	// 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(
@@ -201,10 +201,9 @@ bool PBF::render(const QByteArray &data, int zoom, Style *style,
 		if (it == layers.constEnd())
 			continue;
 
-		drawLayer(*it, style, i, t, scale);
+		drawLayer(*it, style, i, t);
 	}
 
-	t.painter().restore();
 	t.text().render(&t.painter());
 
 	return true;

src/sprites.cpp

@@ -9,12 +9,19 @@
 	Loading the sprites atlas image must be deferred until all image plugins
 	are loaded, otherwise reading the image will cause a deadlock!
 */
-static QImage &atlas(const QString &fileName)
+static const QImage *atlas(const QString &fileName)
 {
 	static QImage *img = new QImage(fileName);
-	return *img;
+	return img;
 }
 
+static const QImage *atlas2x(const QString &fileName)
+{
+	static QImage *img = new QImage(fileName);
+	return img;
+}
+
+
 Sprites::Sprite::Sprite(const QJsonObject &json)
 {
 	int x, y, width, height;
@@ -42,7 +49,17 @@ Sprites::Sprite::Sprite(const QJsonObject &json)
 bool Sprites::load(const QString &jsonFile, const QString &imageFile)
 {
 	_imageFile = imageFile;
+	return load(jsonFile, _sprites);
+}
 
+bool Sprites::load2x(const QString &jsonFile, const QString &imageFile)
+{
+	_image2xFile = imageFile;
+	return load(jsonFile, _sprites2x);
+}
+
+bool Sprites::load(const QString &jsonFile, QMap<QString, Sprite> &map)
+{
 	QFile file(jsonFile);
 	if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
 		qCritical() << jsonFile << ": error opening file";
@@ -64,7 +81,7 @@ bool Sprites::load(const QString &jsonFile, const QString &imageFile)
 		if (val.isObject()) {
 			Sprite s(val.toObject());
 			if (s.rect().isValid())
-				_sprites.insert(it.key(), s);
+				map.insert(it.key(), s);
 			else
 				qWarning() << it.key() << ": invalid sprite definition";
 		} else
@@ -74,20 +91,36 @@ bool Sprites::load(const QString &jsonFile, const QString &imageFile)
 	return true;
 }
 
-QImage Sprites::icon(const QString &name) const
+QImage Sprites::icon(const QString &name, bool hidpi) const
 {
-	if (_imageFile.isNull())
-		return QImage();
-	const QImage &img = atlas(_imageFile);
-	if (img.isNull())
+	qreal ratio;
+	const QImage *img;
+	const QMap<QString, Sprite> *map;
+
+	if (hidpi && !_image2xFile.isNull()) {
+		img = atlas2x(_image2xFile);
+		map = &_sprites2x;
+		ratio = 2;
+	} else if (!_imageFile.isNull()) {
+		img = atlas(_imageFile);
+		map = &_sprites;
+		ratio = 1;
+	} else
 		return QImage();
 
-	QMap<QString, Sprite>::const_iterator it = _sprites.find(name);
-	if (it == _sprites.constEnd())
+	if (img->isNull())
 		return QImage();
 
-	if (!img.rect().contains(it->rect()))
+
+	QMap<QString, Sprite>::const_iterator it = map->find(name);
+	if (it == map->constEnd())
 		return QImage();
 
-	return img.copy(it->rect());
+	if (!img->rect().contains(it->rect()))
+		return QImage();
+
+	QImage ret(img->copy(it->rect()));
+	ret.setDevicePixelRatio(ratio);
+
+	return ret;
 }

src/sprites.h

@@ -9,8 +9,9 @@ class Sprites
 {
 public:
 	bool load(const QString &jsonFile, const QString &imageFile);
+	bool load2x(const QString &jsonFile, const QString &imageFile);
 
-	QImage icon(const QString &name) const;
+	QImage icon(const QString &name, bool hidpi) const;
 
 private:
 	class Sprite {
@@ -22,8 +23,10 @@ private:
 		QRect _rect;
 	};
 
-	QMap<QString, Sprite> _sprites;
-	QString _imageFile;
+	bool load(const QString &jsonFile, QMap<QString, Sprite> &map);
+
+	QMap<QString, Sprite> _sprites, _sprites2x;
+	QString _imageFile, _image2xFile;
 };
 
 #endif // SPRITES_H

src/style.cpp

@@ -223,7 +223,8 @@ QPen Style::Layer::Paint::pen(Type type, int zoom) const
 	return pen;
 }
 
-QBrush Style::Layer::Paint::brush(Type type, int zoom, const Sprites &sprites) const
+QBrush Style::Layer::Paint::brush(Type type, int zoom, const Sprites &sprites,
+  bool hidpi) const
 {
 	QColor color;
 	QBrush brush(Qt::NoBrush);
@@ -236,7 +237,7 @@ QBrush Style::Layer::Paint::brush(Type type, int zoom, const Sprites &sprites) c
 				brush = QBrush(color);
 			pattern = _fillPattern.value(zoom);
 			if (!pattern.isNull())
-				brush.setTextureImage(sprites.icon(pattern));
+				brush.setTextureImage(sprites.icon(pattern, hidpi));
 			break;
 		case Background:
 			color = _backgroundColor.value(zoom);
@@ -244,7 +245,7 @@ QBrush Style::Layer::Paint::brush(Type type, int zoom, const Sprites &sprites) c
 				brush = QBrush(color);
 			pattern = _fillPattern.value(zoom);
 			if (!pattern.isNull())
-				brush.setTextureImage(sprites.icon(pattern));
+				brush.setTextureImage(sprites.icon(pattern, hidpi));
 			break;
 		default:
 			break;
@@ -448,7 +449,8 @@ void Style::Layer::setPathPainter(Tile &tile, const Sprites &sprites) const
 	pen.setJoinStyle(_layout.lineJoin(zoom));
 	pen.setCapStyle(_layout.lineCap(zoom));
 
-	QBrush brush(_paint.brush(_type, zoom, sprites));
+	bool hidpi = qMax(tile.scale().x(), tile.scale().y()) > 1.0 ? true : false;
+	QBrush brush(_paint.brush(_type, zoom, sprites, hidpi));
 
 	p.setRenderHint(QPainter::Antialiasing, _paint.antialias(_type, zoom));
 	p.setPen(pen);
@@ -478,7 +480,8 @@ void Style::Layer::addSymbol(Tile &tile, const QPainterPath &path,
 		return;
 
 	QString icon = _layout.icon(tile.zoom(), tags);
-	tile.text().addLabel(text, sprites.icon(icon), path);
+	bool hidpi = qMax(tile.scale().x(), tile.scale().y()) > 1.0 ? true : false;
+	tile.text().addLabel(text, sprites.icon(icon, hidpi), path);
 }
 
 bool Style::load(const QString &fileName)
@@ -509,7 +512,9 @@ bool Style::load(const QString &fileName)
 	for (int i = 0; i < _layers.size(); i++)
 		_sourceLayers.append(_layers.at(i).sourceLayer());
 
+
 	QDir styleDir = QFileInfo(fileName).absoluteDir();
+
 	QString spritesJSON(styleDir.filePath("sprite.json"));
 	if (QFileInfo::exists(spritesJSON)) {
 		QString spritesImg(styleDir.filePath("sprite.png"));
@@ -519,6 +524,15 @@ bool Style::load(const QString &fileName)
 			qCritical() << spritesImg << ": no such file";
 	}
 
+	QString sprites2xJSON(styleDir.filePath("sprite@2x.json"));
+	if (QFileInfo::exists(sprites2xJSON)) {
+		QString sprites2xImg(styleDir.filePath("sprite@2x.png"));
+		if (QFileInfo::exists(sprites2xImg))
+			_sprites.load2x(sprites2xJSON, sprites2xImg);
+		else
+			qCritical() << sprites2xImg << ": no such file";
+	}
+
 	return true;
 }
 

src/style.h

@@ -136,7 +136,8 @@ private:
 			Paint(const QJsonObject &json);
 
 			QPen pen(Layer::Type type, int zoom) const;
-			QBrush brush(Layer::Type type, int zoom, const Sprites &sprites) const;
+			QBrush brush(Layer::Type type, int zoom, const Sprites &sprites,
+			  bool hidpi) const;
 			qreal opacity(Layer::Type type, int zoom) const;
 			bool antialias(Layer::Type type, int zoom) const;
 			QString fillPattern(int zoom) const

src/text.cpp

@@ -1,4 +1,4 @@
-#include <QFontMetrics>
+#include <QFontMetrics>
 #include <QPainter>
 #include "text.h"
 #include "textpointitem.h"

src/text.h

@@ -34,8 +34,7 @@ public:
 		Auto
 	};
 
-	Text(const QSize &size)
-	  : _sceneRect(QRectF(QPointF(0, 0), size)) {}
+	Text(const QSize &size) : _sceneRect(QRectF(QPointF(0, 0), size)) {}
 	~Text();
 
 	void setFont(const QFont &font) {_font = font;}

src/textpointitem.cpp

@@ -71,7 +71,8 @@ QRectF TextPointItem::fuzzyBoundingRect(const QString &str,
 
 QRectF TextPointItem::computeTextRect(BoundingRectFunction brf) const
 {
-	QRectF iconRect = _icon.isNull() ? QRectF() : _icon.rect();
+	QRectF iconRect = _icon.isNull() ? QRectF()
+	  : QRectF(QPointF(0, 0), QSizeF(_icon.size()) / _icon.devicePixelRatioF());
 	QRectF textRect = brf(text(), font(), _maxWidth);
 
 	switch (_anchor) {
@@ -108,7 +109,8 @@ TextPointItem::TextPointItem(const QString &text, const QPointF &pos,
 	_boundingRect = computeTextRect(fuzzyBoundingRect);
 
 	if (!_icon.isNull()) {
-		QRectF iconRect(_icon.rect());
+		QRectF iconRect(QPointF(0, 0), QSizeF(_icon.size())
+		  / _icon.devicePixelRatioF());
 		iconRect.moveCenter(pos);
 		_boundingRect |= iconRect;
 	}
@@ -125,8 +127,9 @@ void TextPointItem::paint(QPainter *painter) const
 
 	if (!_icon.isNull()) {
 		textRect = computeTextRect(exactBoundingRect);
-		painter->drawImage(_pos - QPointF(_icon.width() / 2,
-		  _icon.height() / 2), _icon);
+		painter->drawImage(_pos - QPointF(_icon.width()
+		  / _icon.devicePixelRatioF() / 2, _icon.height()
+		  / _icon.devicePixelRatioF() / 2), _icon);
 	} else
 		textRect = computeTextRect(fuzzyBoundingRect);
 

src/tile.h

@@ -8,18 +8,22 @@
 class Tile {
 public:
 	Tile(QImage *img, int zoom, const QPointF &scale)
-	  : _zoom(zoom), _size(img->size()), _text(QSize(img->size().width()
-	  / scale.x(), img->size().height() / scale.y())), _painter(img)
+	  : _zoom(zoom), _size(img->size()), _scale(scale),
+	  _text(QSize(img->size().width() / scale.x(),
+	  img->size().height() / scale.y())), _painter(img)
 	  {_painter.scale(scale.x(), scale.y());}
 
 	int zoom() const {return _zoom;}
-	QSize size() const {return _size;}
+	const QSize &size() const {return _size;}
+	const QPointF &scale() const {return _scale;}
+
 	Text &text() {return _text;}
 	QPainter &painter() {return _painter;}
 
 private:
 	int _zoom;
 	QSize _size;
+	QPointF _scale;
 	Text _text;
 	QPainter _painter;
 };