Fixed artifact path

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

.appveyor.yml

@@ -0,0 +1,32 @@
+version: 3.0.{build}
+
+configuration:
+  - Release
+
+image:
+  - Visual Studio 2022
+
+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
+
+install:
+- cmd: |-
+    set PATH=%QTDIR%\bin;%VCPKGDIR%\tools\protobuf;%PATH%
+    call "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvars64.bat
+    vcpkg install protobuf:x64-windows-static-md
+    vcpkg install zlib:x64-windows-static-md
+    copy /y %VCPKGDIR%\lib\zlib.lib %VCPKGDIR%\lib\zlibstatic.lib
+
+build_script:
+- cmd: |-
+    qmake PROTOBUF=%VCPKGDIR% ZLIB=%VCPKGDIR% pbfplugin.pro
+    nmake release
+
+artifacts:
+- 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-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install protobuf compiler
+        run: |
+          sudo apt-get update
+          sudo apt-get install protobuf-compiler
+      - name: set up JDK 11
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'zulu'
+          java-version: '11'
+      - name: Setup Android SDK
+        uses: android-actions/setup-android@v2
+      - name: Run sdkmanager update
+        run:  ${ANDROID_HOME}/tools/bin/sdkmanager --update
+      - name: Install android platform, platform-tools, build-tools and ndk
+        run:  ${ANDROID_HOME}/tools/bin/sdkmanager --install "cmdline-tools;latest" "platform-tools" "platforms;android-33" "build-tools;33.0.0" "ndk;23.1.7779620"
+      - name: Setup NDK path
+        run: echo "ANDROID_NDK_ROOT=${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@v3
+        with:
+          name: libplugins_imageformats_libpbf_arm64-v8a.so
+          path: plugins/libpbf/libplugins_imageformats_libpbf_arm64-v8a.so

.github/workflows/linux.yml

@@ -0,0 +1,22 @@
+name: Linux
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: QtPBFImagePlugin
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install qtbase5-dev qtbase5-dev-tools qt5-qmake libprotobuf-dev protobuf-compiler zlib1g-dev
+      - name: Configure build
+        run: qmake pbfplugin.pro
+      - name: Build project
+        run: make -j2

.github/workflows/osx.yml

@@ -0,0 +1,37 @@
+name: OS X
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  qt5:
+    name: QtPBFImagePlugin Qt5 build
+    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" >> $GITHUB_ENV
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install dependencies
+        run: brew install qt@5 protobuf@21
+      - name: Configure build
+        run: qmake PROTOBUF=/usr/local/opt/protobuf@21 pbfplugin.pro
+      - name: Build project
+        run: make -j3
+
+  qt6:
+    name: QtPBFImagePlugin Qt6 build
+    runs-on: macos-latest
+    steps:
+      - name: Set environment variables
+        run: echo "PATH=/usr/local/opt/qt@6/bin:/usr/local/opt/protobuf@21/bin:$PATH" >> $GITHUB_ENV
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Install dependencies
+        run: brew install qt@6 protobuf@21
+      - name: Configure build
+        run: qmake PROTOBUF=/usr/local/opt/protobuf@21 pbfplugin.pro
+      - name: Build project
+        run: make -j3

.travis.yml

@@ -1,23 +0,0 @@
-language: c++
-dist: focal
-
-os:
-  - linux
-  - osx
-
-env:
-  - QT_SELECT=qt5
-
-before_install:
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get -qq update; fi
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update; fi
-
-install:
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install qt protobuf; fi
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get install qtbase5-dev qtbase5-dev-tools qt5-qmake libprotobuf-dev protobuf-compiler; fi
-
-script:
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then PATH=/usr/local/opt/qt/bin/:${PATH}; fi
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then qmake PROTOBUF=/usr/local pbfplugin.pro; fi
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then qmake pbfplugin.pro; fi
-  - make

README.md

@@ -7,7 +7,7 @@ displaying raster MBTiles maps or raster XYZ online maps to also display
 PBF(MVT) vector tiles without (almost, see usage) any application modifications.
 
 Standard Mapbox GL Styles are used for styling the maps. Most relevant style
-features used by [Maputnik](http://editor.openmaptiles.org) are supported.
+features used by [Maputnik](https://maputnik.github.io/editor) are supported.
 A default fallback style (OSM-Liberty) for OpenMapTiles is part of the plugin.
 
 "Plain" PBF files as well as gzip compressed files (as used in MBTiles) are
@@ -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
+parameter of the QImage constructor or the *QImage::loadFromData()* or
-QPixmap::loadFromData() functions. The zoom number is passed as ASCII string
+*QPixmap::loadFromData()* functions. The zoom number is passed as ASCII string
 to the functions:
 ```cpp
-QPixmap pm;
+QImage img;
-pm.loadFromData(tileData, QString::number(zoom).toLatin1());
+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
-QImageReader reader(file, QString::number(zoom).toLatin1());
+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)
+### Overzoom
-conversion utility.
+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
@@ -43,7 +58,8 @@ The map style is loaded from the
 file on plugin load. If the style uses a sprite, the sprite JSON file must
 be named `sprite.json` and the sprite image `sprite.png` and both files must be
 placed in the same directory as the style itself. *A style compatible with the
-tiles data schema (Mapbox, OpenMapTiles, Tilezen) must be used.*
+tiles data schema (Mapbox, OpenMapTiles, Tilezen, Ordnance Survey, Esri, ...)
+must be used.*
 
 For a list of "ready to use" styles see the
 [QtPBFImagePlugin-styles](https://github.com/tumic0/QtPBFImagePlugin-styles)
@@ -51,7 +67,7 @@ repository.
 
 ## Build
 ### Requirements
-* Qt5 >= 5.12 or Qt6
+* Qt5 >= 5.11 or Qt6
 * Google Protocol Buffers (protobuf-lite)
 * Zlib
 

pbfplugin.pro

@@ -2,6 +2,7 @@ TARGET  = pbf
 TEMPLATE = lib
 CONFIG += plugin
 QT += gui
+VERSION = 3.0
 
 PROTOS = protobuf/vector_tile.proto
 include(protobuf/vector_tile.pri)
@@ -38,21 +39,34 @@ 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 \
         $$ZLIB/include
     LIBS += $$PROTOBUF/lib/libprotobuf-lite.lib \
         $$ZLIB/lib/zlibstatic.lib
+
+    QMAKE_TARGET_PRODUCT = QtPBFImagePlugin
+    QMAKE_TARGET_DESCRIPTION = Qt $$QT_VERSION MVT/PBF image plugin
+    QMAKE_TARGET_COPYRIGHT = Copyright (c) 2023 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 += $$[QT_INSTALL_PLUGINS]/imageformats
+    top_builddir=$$shadowed($$PWD)
-INSTALLS += target
+    DESTDIR = $$top_builddir/plugins/libpbf
+    TARGET = $$qt5LibraryTarget(libpbf, "plugins/imageformats/")
+}

src/gzip.cpp

@@ -6,7 +6,7 @@
 
 QByteArray Gzip::uncompress(QIODevice *device, int limit)
 {
-	int ret;
+	int ret = Z_STREAM_END;
 	z_stream strm;
 	unsigned char in[CHUNK];
 	unsigned char out[CHUNK];

src/pbfhandler.cpp

@@ -79,16 +79,19 @@ bool PBFHandler::read(QImage *image)
 		return false;
 	}
 
-	bool ok;
+	QList<QByteArray> list(format().split(';'));
-	int zoom = format().toInt(&ok);
+	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/textitem.cpp

@@ -21,14 +21,14 @@ qreal TextItem::avgCharWidth() const
 		ratio = 1.0;
 	// Greek & Cyrilic
 	else if (cp >= 0x03FF && cp <= 0x04FF) {
-		ratio = (_font.capitalization() == QFont::AllUppercase) ? 0.80 : 0.73;
+		ratio = (_font.capitalization() == QFont::AllUppercase) ? 0.80 : 0.70;
 		if (_font.bold())
 			ratio *= 1.1;
 		if (_font.italic())
 			ratio *= 0.9;
 	// The rest (Latin scripts, Arabic, ...)
 	} else {
-		ratio = (_font.capitalization() == QFont::AllUppercase) ? 0.75 : 0.63;
+		ratio = (_font.capitalization() == QFont::AllUppercase) ? 0.75 : 0.60;
 		if (_font.bold())
 			ratio *= 1.1;
 		if (_font.italic())

src/textpathitem.cpp

@@ -9,23 +9,20 @@
 #define INTERSECTS intersects
 #endif // QT 5.15
 
-static bool intersection(const QLineF &line, const QRectF &rect,
+static void swap(const QLineF &line, QPointF *p1, QPointF *p2)
-  QPointF *p)
 {
-	if (line.INTERSECTS(QLineF(rect.topLeft(), rect.topRight()), p)
-	  == QLineF::BoundedIntersection)
-		return true;
-	if (line.INTERSECTS(QLineF(rect.topLeft(), rect.bottomLeft()), p)
-	  == QLineF::BoundedIntersection)
-		return true;
-	if (line.INTERSECTS(QLineF(rect.bottomRight(), rect.bottomLeft()), p)
-	  == QLineF::BoundedIntersection)
-		return true;
-	if (line.INTERSECTS(QLineF(rect.bottomRight(), rect.topRight()), p)
-	  == QLineF::BoundedIntersection)
-		return true;
 
-	return false;
+	QPointF lp1(line.p1());
+	QPointF lp2(line.p2());
+
+	if ((lp1.rx() < lp2.rx() && p1->rx() > p2->rx())
+	  || (lp1.ry() < lp2.ry() && p1->ry() > p2->ry())
+	  || (lp1.rx() > lp2.rx() && p1->rx() < p2->rx())
+	  || (lp1.ry() > lp2.ry() && p1->ry() < p2->ry())) {
+		QPointF tmp(*p2);
+		*p2 = *p1;
+		*p1 = tmp;
+	}
 }
 
 static bool intersection(const QLineF &line, const QRectF &rect, QPointF *p1,
@@ -38,20 +35,26 @@ static bool intersection(const QLineF &line, const QRectF &rect, QPointF *p1,
 		p = p2;
 	if (line.INTERSECTS(QLineF(rect.topLeft(), rect.bottomLeft()), p)
 	  == QLineF::BoundedIntersection) {
-		if (p == p2)
+		if (p == p2) {
+			swap(line, p1, p2);
 			return true;
+		}
 		p = p2;
 	}
 	if (line.INTERSECTS(QLineF(rect.bottomRight(), rect.bottomLeft()), p)
 	  == QLineF::BoundedIntersection) {
-		if (p == p2)
+		if (p == p2) {
+			swap(line, p1, p2);
 			return true;
+		}
 		p = p2;
 	}
 	if (line.INTERSECTS(QLineF(rect.bottomRight(), rect.topRight()), p)
 	  == QLineF::BoundedIntersection) {
-		if (p == p2)
+		if (p == p2) {
+			swap(line, p1, p2);
 			return true;
+		}
 	}
 
 	Q_ASSERT(p != p2);
@@ -59,22 +62,42 @@ static bool intersection(const QLineF &line, const QRectF &rect, QPointF *p1,
 	return false;
 }
 
-static QPainterPath subpath(const QList<QLineF> &lines, int start, int end,
+static bool intersection(const QLineF &line, const QRectF &rect, QPointF *p)
+{
+	if (line.INTERSECTS(QLineF(rect.topLeft(), rect.topRight()), p)
+	  == QLineF::BoundedIntersection)
+		return true;
+	if (line.INTERSECTS(QLineF(rect.topLeft(), rect.bottomLeft()), p)
+	  == QLineF::BoundedIntersection)
+		return true;
+	if (line.INTERSECTS(QLineF(rect.bottomRight(), rect.bottomLeft()), p)
+	  == QLineF::BoundedIntersection)
+		return true;
+	if (line.INTERSECTS(QLineF(rect.bottomRight(), rect.topRight()), p)
+	  == QLineF::BoundedIntersection)
+		return true;
+
+	return false;
+}
+
+static QPainterPath subpath(const QPolygonF &path, int start, int end,
   qreal cut)
 {
 	qreal ss = 0, es = 0;
 	int si = start, ei = end;
 
-	for (int i = start; i <= end; i++) {
+	for (int i = start; i < end; i++) {
-		qreal len = lines.at(i).length();
+		QLineF l(path.at(i), path.at(i+1));
+		qreal len = l.length();
 		if (ss + len < cut / 2) {
 			ss += len;
 			si++;
 		} else
 			break;
 	}
-	for (int i = end; i >= start; i--) {
+	for (int i = end; i > start; i--) {
-		qreal len = lines.at(i).length();
+		QLineF l(path.at(i), path.at(i-1));
+		qreal len = l.length();
 		if (es + len < cut / 2) {
 			es += len;
 			ei--;
@@ -82,98 +105,117 @@ static QPainterPath subpath(const QList<QLineF> &lines, int start, int end,
 			break;
 	}
 
-	QLineF sl(lines.at(si).p2(), lines.at(si).p1());
+	QLineF sl(path.at(si+1), path.at(si));
 	sl.setLength(sl.length() - (cut / 2 - ss));
-	QLineF el(lines.at(ei));
+	QLineF el(path.at(ei-1), path.at(ei));
 	el.setLength(el.length() - (cut / 2 - es));
 
 	QPainterPath p(sl.p2());
-	for (int i = si; i <= ei; i++)
+	for (int i = si + 1; i < ei; i++)
-		p.lineTo(lines.at(i).p2());
+		p.lineTo(path.at(i));
-	p.setElementPositionAt(p.elementCount() - 1, el.p2().x(), el.p2().y());
+	p.lineTo(el.p2());
 
 	return p;
 }
 
-static QList<QLineF> lineString(const QPainterPath &path,
+static QList<QPolygonF> polyLines(const QPainterPath &path, const QRectF &rect)
-  const QRectF &boundingRect)
 {
-	QList<QLineF> lines;
+	QList<QPolygonF> lines;
-	int start = -1, end = -1;
+	QPolygonF line;
+	bool lastIn = rect.contains(path.elementAt(0));
 
+	for (int i = 1; i < path.elementCount(); i++) {
+		if (rect.contains(path.elementAt(i))) {
+			if (lastIn) {
+				if (line.isEmpty())
+					line.append(path.elementAt(i-1));
+				line.append(path.elementAt(i));
+			} else {
+				QPointF p;
+				QLineF l(path.elementAt(i-1), path.elementAt(i));
 
-	for (int i = 0; i < path.elementCount(); i++) {
+				if (intersection(l, rect, &p))
-		if (boundingRect.contains(path.elementAt(i))) {
+					line.append(p);
-			start = i;
+				line.append(path.elementAt(i));
-			break;
-		}
-	}
-	for (int i = path.elementCount() - 1; i >= 0; i--) {
-		if (boundingRect.contains(path.elementAt(i))) {
-			end = i;
-			break;
-		}
-	}
-
-	if (start < 0) {
-		QPointF p1, p2;
-
-		for (int i = 1; i < path.elementCount(); i++) {
-			QLineF l(path.elementAt(i-1), path.elementAt(i));
-			if (intersection(l, boundingRect, &p1, &p2)) {
-				lines.append(QLineF(p1, p2));
-				break;
 			}
-		}
-	} else {
-		QPointF p;
 
-		if (start > 0) {
+			lastIn = true;
-			QLineF l(path.elementAt(start-1), path.elementAt(start));
+		} else {
-			if (intersection(l, boundingRect, &p))
+			QLineF l(path.elementAt(i-1), path.elementAt(i));
-				lines.append(QLineF(p, path.elementAt(start)));
+
-		}
+			if (lastIn) {
-		for (int i = start + 1; i <= end; i++)
+				QPointF p;
-			lines.append(QLineF(path.elementAt(i-1), path.elementAt(i)));
+				if (line.isEmpty())
-		if (end < path.elementCount() - 1) {
+					line.append(path.elementAt(i-1));
-			QLineF l(path.elementAt(end), path.elementAt(end+1));
+				if (intersection(l, rect, &p))
-			if (intersection(l, boundingRect, &p))
+					line.append(p);
-				lines.append(QLineF(path.elementAt(end), p));
+				lines.append(line);
+				line.clear();
+			} else {
+				QPointF p1, p2;
+				if (intersection(l, rect, &p1, &p2)) {
+					line.append(p1);
+					line.append(p2);
+					lines.append(line);
+					line.clear();
+				}
+			}
+
+			lastIn = false;
 		}
 	}
 
+	if (!line.isEmpty())
+		lines.append(line);
+
 	return lines;
 }
 
+static qreal diff(qreal a1, qreal a2)
+{
+	qreal d = qAbs(a1 - a2);
+	return (d > 180) ? 360 - d : d;
+}
+
 static QPainterPath textPath(const QPainterPath &path, qreal textWidth,
   qreal maxAngle, qreal charWidth, const QRectF &tileRect)
 {
-	QList<QLineF> lines(lineString(path, tileRect));
+	if (path.isEmpty())
-	if (lines.isEmpty())
 		return QPainterPath();
-	qreal length = 0;
+
-	qreal angle = lines.first().angle();
+	QList<QPolygonF> lines(polyLines(path, tileRect));
-	int last = 0;
 
 	for (int i = 0; i < lines.size(); i++) {
-		qreal sl = lines.at(i).length();
+		const QPolygonF &pl = lines.at(i);
-		qreal a = lines.at(i).angle();
+		qreal angle = 0, length = 0;
+		int last = 0;
 
-		if (!tileRect.contains(lines.at(i).p2()) || sl < charWidth
+		for (int j = 1; j < pl.size(); j ++) {
-		  || qAbs(angle - a) > maxAngle) {
+			QLineF l(pl.at(j-1), pl.at(j));
-			if (length > textWidth)
+			qreal sl = l.length();
-				return subpath(lines, last, i - 1, length - textWidth);
+			qreal a = l.angle();
-			last = i;
-			length = 0;
-		} else
-			length += sl;
 
-		angle = a;
+			if (sl < charWidth) {
+				if (length > textWidth)
+					return subpath(pl, last, j - 1, length - textWidth);
+				last = j;
+				length = 0;
+			} else if (j > 1 && diff(angle, a) > maxAngle) {
+				if (length > textWidth)
+					return subpath(pl, last, j - 1, length - textWidth);
+				last = j - 1;
+				length = sl;
+			} else
+				length += sl;
+
+			angle = a;
+		}
+
+		if (length > textWidth)
+			return subpath(pl, last, pl.size() - 1, length - textWidth);
 	}
 
-	return (length > textWidth)
+	return QPainterPath();
-	  ? subpath(lines, last, lines.size() - 1, length - textWidth)
-	  : QPainterPath();
 }
 
 static bool reverse(const QPainterPath &path)
@@ -208,9 +250,6 @@ TextPathItem::TextPathItem(const QString &text, const QPainterPath &path,
 
 void TextPathItem::paint(QPainter *painter) const
 {
-	//painter->setPen(Qt::red);
-	//painter->drawPath(_shape);
-
 	QFontMetrics fm(font());
 	int textWidth = fm.boundingRect(text()).width();
 
@@ -259,4 +298,9 @@ void TextPathItem::paint(QPainter *painter) const
 		int width = fm.horizontalAdvance(text().at(i));
 		percent += ((qreal)width / (qreal)textWidth) * factor;
 	}
+
+	//painter->setBrush(Qt::NoBrush);
+	//painter->setPen(Qt::red);
+	//painter->setRenderHint(QPainter::Antialiasing, false);
+	//painter->drawPath(_shape);
 }

src/tile.h

@@ -11,7 +11,10 @@ public:
 	  : _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());}
+	{
+		img->fill(Qt::transparent);
+		_painter.scale(scale.x(), scale.y());
+	}
 
 	int zoom() const {return _zoom;}
 	const QSize &size() const {return _size;}

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"
-}
+}