Code cleanup

The API should be backward compatible but the overzoom extension should rather
be promoted with a major version number change.

.appveyor.yml

@@ -1,4 +1,4 @@
-version: 2.6.{build}
+version: 3.1.{build}
 
 configuration:
   - Release
@@ -10,7 +10,7 @@ environment:
   VCPKGDIR: C:\tools\vcpkg\installed\x64-windows-static-md
   matrix:
   - QTDIR: C:\Qt\5.15\msvc2019_64
-  - QTDIR: C:\Qt\6.5\msvc2019_64
+  - QTDIR: C:\Qt\6.7\msvc2019_64
 
 install:
 - cmd: |-
@@ -26,7 +26,7 @@ build_script:
     nmake release
 
 artifacts:
-- path: release\pbf2.dll
+- path: release\pbf3.dll
 
 cache:
 - C:\tools\vcpkg\installed\

.github/workflows/android.yml

@@ -0,0 +1,54 @@
+name: Android
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: QtPBFImagePlugin
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install protobuf compiler
+        run: |
+          sudo apt-get update
+          sudo apt-get install protobuf-compiler
+      - name: set up JDK 11
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '11'
+      - name: Setup Android SDK
+        uses: android-actions/setup-android@v3
+        with:
+          cmdline-tools-version: 9862592
+      - name: Install android platform, build-tools and ndk
+        run:  ${ANDROID_HOME}/cmdline-tools/latest/bin/sdkmanager --install "platforms;android-33" "build-tools;33.0.0" "ndk;23.1.7779620"
+      - name: Setup NDK path
+        run: echo "ANDROID_NDK_ROOT=${ANDROID_HOME}/ndk/23.1.7779620/" >> $GITHUB_ENV
+      - name: Install Qt (Desktop)
+        uses: jurplel/install-qt-action@v3
+        with:
+          aqtversion: '==3.1.*'
+          version: '6.4.0'
+      - name: Install Qt (Android)
+        uses: jurplel/install-qt-action@v3
+        with:
+          aqtversion: '==3.1.*'
+          version: '6.4.0'
+          target: 'android'
+          arch: 'android_arm64_v8a'
+      - name: Install Android Google Protocol Buffers
+        run:  git clone https://github.com/tumic0/android_protobuf.git
+      - name: Configure build
+        run:  qmake pbfplugin.pro PROTOBUF=android_protobuf
+      - name: Build project
+        run:  make -j2
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: libplugins_imageformats_libpbf_arm64-v8a.so
+          path: plugins/libplugins_imageformats_libpbf_arm64-v8a.so

.github/workflows/linux.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Install dependencies
         run: |
           sudo apt-get update

.github/workflows/osx.yml

@@ -11,13 +11,15 @@ jobs:
     runs-on: macos-latest
     steps:
       - name: Set environment variables
-        run: echo "PATH=/usr/local/opt/qt@5/bin:/usr/local/opt/protobuf@21/bin:$PATH" >> $GITHUB_ENV
+        run: echo "PATH=/opt/homebrew/opt/qt@5/bin:/opt/homebrew/opt/protobuf@21/bin:$PATH" >> $GITHUB_ENV
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Install dependencies
-        run: brew install qt@5 protobuf@21
+        run: |
+          brew update
+          brew install qt@5 protobuf@21
       - name: Configure build
-        run: qmake PROTOBUF=/usr/local/opt/protobuf@21 pbfplugin.pro
+        run: qmake PROTOBUF=/opt/homebrew/opt/protobuf@21 pbfplugin.pro
       - name: Build project
         run: make -j3
 
@@ -26,12 +28,14 @@ jobs:
     runs-on: macos-latest
     steps:
       - name: Set environment variables
-        run: echo "PATH=/usr/local/opt/qt@6/bin:/usr/local/opt/protobuf@21/bin:$PATH" >> $GITHUB_ENV
+        run: echo "PATH=/opt/homebrew/opt/qt@6/bin:/opt/homebrew/opt/protobuf@21/bin:$PATH" >> $GITHUB_ENV
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Install dependencies
-        run: brew install qt@6 protobuf@21
+        run: |
+          brew update
+          brew install qt@6 protobuf@21
       - name: Configure build
-        run: qmake PROTOBUF=/usr/local/opt/protobuf@21 pbfplugin.pro
+        run: qmake PROTOBUF=/opt/homebrew/opt/protobuf@21 pbfplugin.pro
       - name: Build project
         run: make -j3

README.md

@@ -18,24 +18,39 @@ to fit the styles and available data (OpenMapTiles, Mapbox tiles).
 Due to a major design flaw in the Mapbox vector tiles specification - the zoom
 is not part of the PBF data - the plugin can not be used "as is", but passing
 the zoom level is necessary. This is done by exploiting the optional *format*
-parameter of the QImage constructor or the QImage::fromData() or
-QPixmap::loadFromData() functions. The zoom number is passed as ASCII string
+parameter of the QImage constructor or the *QImage::loadFromData()* or
+*QPixmap::loadFromData()* functions. The zoom number is passed as ASCII string
 to the functions:
 ```cpp
-QPixmap pm;
-pm.loadFromData(tileData, QByteArray::number(zoom));
+QImage img;
+img.loadFromData(data, QByteArray::number(zoom));
 ```
-The plugin supports vector scaling using QImageReader's setScaledSize() method,
+
+For a complete code sample see the [pbf2png](https://github.com/tumic0/pbf2png)
+conversion utility.
+
+### HiDPI
+The plugin supports vector scaling using QImageReader's *setScaledSize()* method,
 so when used like in the following example:
 ```cpp
+QImage img;
 QImageReader reader(file, QByteArray::number(zoom));
 reader.setScaledSize(QSize(1024, 1024));
-reader.read(&image);
+reader.read(&img);
 ```
 you will get 1024x1024px tiles with a pixel ratio of 2 (= HiDPI tiles).
 
-For a sample code see the [pbf2png](https://github.com/tumic0/pbf2png)
-conversion utility.
+### Overzoom
+Since version 3 of the plugin tile overzoom is supported. If you set *format*
+to `$zoom;$overzoom`:
+```cpp
+QImage img;
+QByteArray fmt(QByteArray::number(zoom) + ';' + QByteArray::number(overzoom));
+img.loadFromData(data, fmt);
+```
+you will get (512<<overzoom)x(512<<overzoom)px tiles with a pixel ratio of 1.
+When overzoom is combined with setScaledSize(), the base size is the overzoomed
+tile size.
 
 ## Styles
 The map style is loaded from the
@@ -93,7 +108,7 @@ algorithm to work properly.
 A picture is worth a thousand words.
 #### OpenMapTiles
 
-* Data: [MapTiler](https://github.com/tumic0/GPXSee-maps/blob/master/World/MapTiler.tpl)
+* Data: [MapTiler](https://github.com/tumic0/GPXSee-maps/blob/master/World/MapTiler-OpenMapTiles.tpl)
 * Style: [OSM-liberty](https://github.com/tumic0/QtPBFImagePlugin-styles/blob/master/OpenMapTiles/osm-liberty/style.json)
 
 ![osm-liberty 5](https://tumic0.github.io/QtPBFImagePlugin/images/osm-liberty-5.png)

pbfplugin.pro

@@ -2,7 +2,7 @@ TARGET  = pbf
 TEMPLATE = lib
 CONFIG += plugin
 QT += gui
-VERSION = 2.6
+VERSION = 3.1
 
 PROTOS = protobuf/vector_tile.proto
 include(protobuf/vector_tile.pri)
@@ -39,9 +39,12 @@ RESOURCES += pbfplugin.qrc
 
 DEFINES += QT_NO_DEPRECATED_WARNINGS
 
-unix:!macx{
+unix:!macx:!android {
     LIBS += -lprotobuf-lite \
         -lz
+
+    target.path += $$[QT_INSTALL_PLUGINS]/imageformats
+    INSTALLS += target
 }
 win32 {
     INCLUDEPATH += $$PROTOBUF/include \
@@ -51,13 +54,19 @@ win32 {
 
     QMAKE_TARGET_PRODUCT = QtPBFImagePlugin
     QMAKE_TARGET_DESCRIPTION = Qt $$QT_VERSION MVT/PBF image plugin
-    QMAKE_TARGET_COPYRIGHT = Copyright (c) 2023 Martin Tuma
+    QMAKE_TARGET_COPYRIGHT = Copyright (c) 2018-2024 Martin Tuma
 }
 macx {
     INCLUDEPATH += $$PROTOBUF/include
     LIBS += $$PROTOBUF/lib/libprotobuf-lite.a \
         -lz
 }
+android {
+    INCLUDEPATH += $$PROTOBUF/include
+    LIBS += $$PROTOBUF/$$ANDROID_TARGET_ARCH/libprotobuf-lite.a \
+        -lz
 
-target.path += $$[QT_INSTALL_PLUGINS]/imageformats
-INSTALLS += target
+    top_builddir=$$shadowed($$PWD)
+    DESTDIR = $$top_builddir/plugins
+    TARGET = $$qt5LibraryTarget(libpbf, "plugins/imageformats/")
+}

src/pbfhandler.cpp

@@ -79,16 +79,19 @@ bool PBFHandler::read(QImage *image)
 		return false;
 	}
 
-	bool ok;
-	int zoom = format().toInt(&ok);
+	QList<QByteArray> list(format().split(';'));
+	int zoom = list.size() ? list.first().toInt() : 0;
+	int overzoom = (list.size() > 1) ? list.at(1).toInt() : 0;
+
+	QSize scaledSize(_scaledSize.isValid()
+	  ? _scaledSize : QSize(TILE_SIZE, TILE_SIZE));
+	QSize size(scaledSize.width()<<overzoom,
+	  scaledSize.height()<<overzoom);
+	QPointF scale((qreal)scaledSize.width() / TILE_SIZE,
+	  (qreal)scaledSize.height() / TILE_SIZE);
 
-	QSize size = _scaledSize.isValid()
-	  ? _scaledSize : QSize(TILE_SIZE, TILE_SIZE);
-	QPointF scale = _scaledSize.isValid()
-	  ? QPointF((qreal)_scaledSize.width() / TILE_SIZE,
-		(qreal)_scaledSize.height() / TILE_SIZE) : QPointF(1.0, 1.0);
 	*image = QImage(size, QImage::Format_ARGB32_Premultiplied);
-	Tile tile(image, ok ? zoom : -1, scale);
+	Tile tile(image, zoom, scale);
 
 	_style->render(data, tile);
 

src/pbfhandler.h

@@ -11,7 +11,7 @@ class Style;
 class PBFHandler : public QImageIOHandler
 {
 public:
-	PBFHandler(const Style *style) : _style(style) {}
+	PBFHandler(Style *style) : _style(style) {}
 	~PBFHandler() {}
 
 	bool canRead() const;
@@ -24,7 +24,7 @@ public:
 	static bool canRead(QIODevice *device);
 
 private:
-	const Style *_style;
+	Style *_style;
 	QSize _scaledSize;
 };
 

src/sprites.cpp

@@ -4,14 +4,20 @@
 #include <QDebug>
 #include "sprites.h"
 
-
-/*
-	Loading the sprites atlas image must be deferred until all image plugins
-	are loaded, otherwise reading the image will cause a deadlock!
-*/
-static const QImage &atlas(const QString &fileName)
+static QImage sdf2img(const QImage &sdf, const QColor &color)
 {
-	static QImage img(fileName);
+	QImage img(sdf.convertToFormat(QImage::Format_ARGB32));
+	quint32 argb = color.rgba();
+	uchar *bits = img.bits();
+	int bpl = img.bytesPerLine();
+
+	for (int y = 0; y < img.height(); y++) {
+		for (int x = 0; x < img.width(); x++) {
+			quint32 *pixel =  (quint32*)(bits + y * bpl + x * 4);
+			*pixel = ((*pixel >> 24) < 192) ? 0 : argb;
+		}
+	}
+
 	return img;
 }
 
@@ -19,7 +25,6 @@ Sprites::Sprite::Sprite(const QJsonObject &json)
 {
 	int x, y, width, height;
 
-
 	if (json.contains("x") && json["x"].isDouble())
 		x = json["x"].toInt();
 	else
@@ -44,12 +49,15 @@ Sprites::Sprite::Sprite(const QJsonObject &json)
 		_pixelRatio = json["pixelRatio"].toDouble();
 	else
 		_pixelRatio = 1.0;
+
+	if (json.contains("sdf") && json["sdf"].isBool())
+		_sdf = json["sdf"].toBool();
+	else
+		_sdf = false;
 }
 
 bool Sprites::load(const QString &jsonFile, const QString &imageFile)
 {
-	_imageFile = imageFile;
-
 	QFile file(jsonFile);
 	if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
 		qCritical() << jsonFile << ": error opening file";
@@ -78,27 +86,60 @@ bool Sprites::load(const QString &jsonFile, const QString &imageFile)
 			qWarning() << it.key() << ": invalid sprite definition";
 	}
 
+	// Loading the sprites atlas image must be deferred until all image plugins
+	// are loaded, otherwise reading the image will cause a deadlock in Qt!
+	_imageFile = imageFile;
+
 	return true;
 }
 
-QImage Sprites::icon(const QString &name) const
+QImage Sprites::sprite(const Sprite &sprite, const QColor &color, qreal scale)
 {
-	if (_imageFile.isEmpty())
+	_lock.lock();
+	if (_init <= 0) {
+		if (_init < 0) {
+			_lock.unlock();
+			return QImage();
+		}
+
+		_img = QImage(_imageFile);
+		if (_img.isNull()) {
+			qWarning() << _imageFile << ": invalid sprite atlas image";
+			_init = -1;
+			_lock.unlock();
+			return QImage();
+		}
+
+		_init = 1;
+	}
+	_lock.unlock();
+
+	if (!_img.rect().contains(sprite.rect()))
 		return QImage();
 
-	const QImage &img = atlas(_imageFile);
-	if (img.isNull())
+	QImage img(_img.copy(sprite.rect()));
+	img.setDevicePixelRatio(sprite.pixelRatio());
+
+	if (sprite.sdf()) {
+		if (scale != 1.0) {
+			QSize size(img.size().width() * scale, img.size().height() * scale);
+			QImage simg(img.scaled(size, Qt::IgnoreAspectRatio,
+			  Qt::SmoothTransformation));
+			return sdf2img(simg, color);
+		} else
+			return sdf2img(img, color);
+	} else
+		return img;
+}
+
+QImage Sprites::icon(const QString &name, const QColor &color, qreal size)
+{
+	if (name.isNull())
 		return QImage();
 
-	QMap<QString, Sprite>::const_iterator it = _sprites.find(name);
+	QMap<QString, Sprite>::const_iterator it = _sprites.constFind(name);
 	if (it == _sprites.constEnd())
 		return QImage();
 
-	if (!img.rect().contains(it->rect()))
-		return QImage();
-
-	QImage ret(img.copy(it->rect()));
-	ret.setDevicePixelRatio(it->pixelRatio());
-
-	return ret;
+	return sprite(*it, color, size);
 }

src/sprites.h

@@ -5,16 +5,19 @@
 #include <QMap>
 #include <QImage>
 #include <QString>
+#include <QMutex>
 
 class QJsonObject;
 
 class Sprites
 {
 public:
+	Sprites() : _init(0) {}
 	bool load(const QString &jsonFile, const QString &imageFile);
 
 	bool isNull() const {return _imageFile.isNull();}
-	QImage icon(const QString &name) const;
+	QImage icon(const QString &name, const QColor &color = Qt::black,
+	  qreal size = 1.0);
 
 private:
 	class Sprite {
@@ -23,14 +26,21 @@ private:
 
 		const QRect &rect() const {return _rect;}
 		qreal pixelRatio() const {return _pixelRatio;}
+		bool sdf() const {return _sdf;}
 
 	private:
 		QRect _rect;
 		qreal _pixelRatio;
+		bool _sdf;
 	};
 
+	QImage sprite(const Sprite &sprite, const QColor &color, qreal scale);
+
 	QMap<QString, Sprite> _sprites;
+	QImage _img;
+	QMutex _lock;
 	QString _imageFile;
+	int _init;
 };
 
 #endif // SPRITES_H

src/style.cpp

@@ -8,7 +8,6 @@
 #include <QRegularExpression>
 #include <QDebug>
 #include "text.h"
-#include "color.h"
 #include "font.h"
 #include "tile.h"
 #include "pbf.h"
@@ -205,7 +204,7 @@ bool Style::Layer::Filter::match(const PBF::Feature &feature) const
 
 QString Style::Layer::Template::value(int zoom, const PBF::Feature &feature) const
 {
-	QRegularExpression rx("\\{[^\\}]*\\}");
+	static QRegularExpression rx("\\{[^\\}]*\\}");
 	QString text(_field.value(zoom));
 	QRegularExpressionMatchIterator it = rx.globalMatch(text);
 	QStringList keys;
@@ -258,6 +257,9 @@ Style::Layer::Paint::Paint(const QJsonObject &json)
 	_textHaloColor = FunctionC(json["text-halo-color"], QColor());
 	_textHaloWidth = FunctionF(json["text-halo-width"]);
 	_textHaloBlur = FunctionF(json["text-halo-blur"]);
+
+	// icon
+	_iconColor = FunctionC(json["icon-color"]);
 }
 
 QPen Style::Layer::Paint::pen(Type type, int zoom) const
@@ -293,7 +295,7 @@ QPen Style::Layer::Paint::pen(Type type, int zoom) const
 	return pen;
 }
 
-QBrush Style::Layer::Paint::brush(Type type, int zoom, const Sprites &sprites)
+QBrush Style::Layer::Paint::brush(Type type, int zoom, Sprites &sprites)
   const
 {
 	QColor color;
@@ -370,6 +372,7 @@ Style::Layer::Layout::Layout(const QJsonObject &json)
 
 	// icon
 	_icon = Template(FunctionS(json["icon-image"]));
+	_iconSize = FunctionF(json["icon-size"]);
 
 	// symbol
 	_symbolPlacement = FunctionS(json["symbol-placement"]);
@@ -512,7 +515,7 @@ bool Style::Layer::match(int zoom, const PBF::Feature &feature) const
 	return _filter.match(feature);
 }
 
-void Style::Layer::setPathPainter(Tile &tile, const Sprites &sprites) const
+void Style::Layer::setPathPainter(Tile &tile, Sprites &sprites) const
 {
 	QPainter &p = tile.painter();
 	int zoom = tile.zoom();
@@ -545,14 +548,18 @@ void Style::Layer::setTextProperties(Tile &tile) const
 }
 
 void Style::Layer::addSymbol(Tile &tile, const QPainterPath &path,
-  const PBF::Feature &feature, const Sprites &sprites) const
+  const PBF::Feature &feature, Sprites &sprites) const
 {
-	QString text = _layout.text(tile.zoom(), feature);
-	if (text.isEmpty())
+	QString text(_layout.text(tile.zoom(), feature));
+	QString icon(_layout.icon(tile.zoom(), feature));
+	QColor color(_paint.iconColor(tile.zoom()));
+	qreal size(_layout.iconSize(tile.zoom()));
+	QImage img(sprites.icon(icon, color, size));
+
+	if (text.isEmpty() && img.isNull())
 		return;
 
-	QString icon = _layout.icon(tile.zoom(), feature);
-	tile.text().addLabel(text, sprites.icon(icon), path);
+	tile.text().addLabel(text, img, path);
 }
 
 static bool loadSprites(const QDir &styleDir, const QString &json,
@@ -598,20 +605,20 @@ bool Style::load(const QString &fileName)
 				_layers.append(Layer(layers[i].toObject()));
 	}
 
-	QDir styleDir = QFileInfo(fileName).absoluteDir();
+	QDir styleDir(QFileInfo(fileName).absoluteDir());
 	loadSprites(styleDir, "sprite.json", "sprite.png", _sprites);
 	loadSprites(styleDir, "sprite@2x.json", "sprite@2x.png", _sprites2x);
 
 	return true;
 }
 
-const Sprites &Style::sprites(const QPointF &scale) const
+Sprites &Style::sprites(const QPointF &scale)
 {
 	return (scale.x() > 1.0 || scale.y() > 1.0)
 	  && !_sprites2x.isNull() ? _sprites2x : _sprites;
 }
 
-void Style::setupLayer(Tile &tile, const Layer &layer) const
+void Style::setupLayer(Tile &tile, const Layer &layer)
 {
 	if (layer.isSymbol())
 		layer.setTextProperties(tile);
@@ -619,7 +626,7 @@ void Style::setupLayer(Tile &tile, const Layer &layer) const
 		layer.setPathPainter(tile, sprites(tile.scale()));
 }
 
-void Style::drawBackground(Tile &tile) const
+void Style::drawBackground(Tile &tile)
 {
 	QRectF rect(QPointF(0, 0), QSizeF(tile.size().width() / tile.scale().x(),
 	  tile.size().height() / tile.scale().y()));
@@ -634,13 +641,10 @@ void Style::drawBackground(Tile &tile) const
 		_layers.first().setPathPainter(tile, _sprites);
 		tile.painter().drawPath(path);
 	}
-
-	//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
+  Tile &tile, const QSizeF &factor)
 {
 	if (!layer.match(tile.zoom(), feature))
 		return;
@@ -656,7 +660,7 @@ void Style::drawFeature(const PBF::Feature &feature, const Layer &layer,
 }
 
 void Style::drawLayer(const PBF::Layer &pbfLayer, const Layer &styleLayer,
-  Tile &tile) const
+  Tile &tile)
 {
 	if (pbfLayer.data()->version() > 2)
 		return;
@@ -675,7 +679,7 @@ void Style::drawLayer(const PBF::Layer &pbfLayer, const Layer &styleLayer,
 	tile.painter().restore();
 }
 
-void Style::render(const PBF &data, Tile &tile) const
+void Style::render(const PBF &data, Tile &tile)
 {
 	drawBackground(tile);
 
@@ -689,4 +693,11 @@ void Style::render(const PBF &data, Tile &tile) const
 	}
 
 	tile.text().render(&tile.painter());
+
+	//QRectF rect(QPointF(0, 0), QSizeF(tile.size().width() / tile.scale().x(),
+	//  tile.size().height() / tile.scale().y()));
+	//tile.painter().setPen(Qt::red);
+	//tile.painter().setBrush(Qt::NoBrush);
+	//tile.painter().setRenderHint(QPainter::Antialiasing, false);
+	//tile.painter().drawRect(rect);
 }

src/style.h

@@ -29,7 +29,7 @@ public:
 	Style(QObject *parent = 0) : QObject(parent) {}
 
 	bool load(const QString &fileName);
-	void render(const PBF &data, Tile &tile) const;
+	void render(const PBF &data, Tile &tile);
 
 private:
 	class Layer {
@@ -44,10 +44,10 @@ private:
 		bool isVisible() const {return (_layout.visible());}
 
 		bool match(int zoom, const PBF::Feature &feature) const;
-		void setPathPainter(Tile &tile, const Sprites &sprites) const;
+		void setPathPainter(Tile &tile, Sprites &sprites) const;
 		void setTextProperties(Tile &tile) const;
 		void addSymbol(Tile &tile, const QPainterPath &path,
-		  const PBF::Feature &feature, const Sprites &sprites) const;
+		  const PBF::Feature &feature, Sprites &sprites) const;
 
 	private:
 		enum Type {
@@ -103,6 +103,8 @@ private:
 			  {return _text.value(zoom, feature).trimmed();}
 			QString icon(int zoom, const PBF::Feature &feature) const
 			  {return _icon.value(zoom, feature);}
+			qreal iconSize(int zoom) const
+			  {return _iconSize.value(zoom);}
 			QFont font(int zoom) const;
 			Qt::PenCapStyle lineCap(int zoom) const;
 			Qt::PenJoinStyle lineJoin(int zoom) const;
@@ -116,6 +118,7 @@ private:
 
 			Template _text;
 			Template _icon;
+			FunctionF _iconSize;
 			FunctionF _textSize;
 			FunctionF _textMaxWidth;
 			FunctionF _textMaxAngle;
@@ -135,13 +138,15 @@ private:
 			Paint(const QJsonObject &json);
 
 			QPen pen(Layer::Type type, int zoom) const;
-			QBrush brush(Layer::Type type, int zoom, const Sprites &sprites)
+			QBrush brush(Layer::Type type, int zoom, Sprites &sprites)
 			  const;
 			qreal opacity(Layer::Type type, int zoom) const;
 			bool antialias(Layer::Type type, int zoom) const;
 			Text::Halo halo(int zoom) const
 			  {return Text::Halo(_textHaloColor.value(zoom),
 			  _textHaloWidth.value(zoom), _textHaloBlur.value(zoom));}
+			QColor iconColor(int zoom) const
+			  {return _iconColor.value(zoom);}
 
 		private:
 			FunctionC _textColor;
@@ -150,6 +155,7 @@ private:
 			FunctionC _fillColor;
 			FunctionC _fillOutlineColor;
 			FunctionC _backgroundColor;
+			FunctionC _iconColor;
 			FunctionF _fillOpacity;
 			FunctionF _lineOpacity;
 			FunctionF _lineWidth;
@@ -168,14 +174,14 @@ private:
 		Paint _paint;
 	};
 
-	const Sprites &sprites(const QPointF &scale) const;
+	Sprites &sprites(const QPointF &scale);
 
-	void drawBackground(Tile &tile) const;
-	void setupLayer(Tile &tile, const Layer &layer) const;
+	void drawBackground(Tile &tile);
+	void setupLayer(Tile &tile, const Layer &layer);
 	void drawFeature(const PBF::Feature &feature, const Layer &layer,
-	  Tile &tile, const QSizeF &factor) const;
+	  Tile &tile, const QSizeF &factor);
 	void drawLayer(const PBF::Layer &pbfLayer, const Layer &styleLayer,
-	  Tile &tile) const;
+	  Tile &tile);
 
 	QVector<Layer> _layers;
 	Sprites _sprites, _sprites2x;

src/text.cpp

@@ -14,15 +14,10 @@ Text::~Text()
 
 void Text::render(QPainter *painter) const
 {
-	QSet<QString> set;
-
 	for (int i = 0; i < _items.size(); i++) {
 		const TextItem *ti = _items.at(i);
-		if (ti->isVisible() && _sceneRect.intersects(ti->boundingRect())
-		  && !set.contains(ti->text())) {
+		if (ti->isVisible() && _sceneRect.intersects(ti->boundingRect()))
 			ti->paint(painter);
-			set.insert(ti->text());
-		}
 	}
 }
 
@@ -51,6 +46,8 @@ void Text::addLabel(const QString &text, const QImage &icon,
 	} else {
 		switch (_placement) {
 			case Line:
+				if (text.isEmpty())
+					return;
 				ti = new TextPathItem(text, path, _font, _maxAngle, _sceneRect);
 				break;
 			case LineCenter:
@@ -73,7 +70,7 @@ void Text::addLabel(const QString &text, const QImage &icon,
 	ti->setHalo(_halo);
 	addItem(ti);
 
-	QList<TextItem*> ci = collidingItems(ti);
+	QList<TextItem*> ci(collidingItems(ti));
 	for (int i = 0; i < ci.size(); i++)
 		ci[i]->setVisible(false);
 }

src/textpointitem.cpp

@@ -85,7 +85,7 @@ TextPointItem::TextPointItem(const QString &text, const QPointF &pos,
   : TextItem(text, font), _pos(pos), _icon(icon), _maxWidth(maxWidth),
   _anchor(anchor)
 {
-	_textRect = fuzzyBoundingRect();
+	_textRect = text.isEmpty() ? QRectF() : fuzzyBoundingRect();
 	_boundingRect = moveTextRect(_textRect);
 
 	if (!_icon.isNull()) {

style/style.json

@@ -2265,7 +2265,6 @@
       "source": "openmaptiles",
       "source-layer": "building",
       "minzoom": 13,
-      "maxzoom": 14,
       "layout": {
         "visibility": "visible"
       },
@@ -4059,4 +4058,4 @@
     }
   ],
   "id": "osm-liberty"
-}
+}