Specify the text layout requirements more precisely

README.md

@@ -84,16 +84,19 @@ nmake
 
 ## Install
 Copy the plugin to the system Qt image plugins path to make it work. You may
-also set the QT_PLUGIN_PATH system variable before starting the application. For
+also set the QT_PLUGIN_PATH system variable before starting the application.
-Linux, there are RPM and DEB [packages](https://build.opensuse.org/project/show/home:tumic:QtPBFImagePlugin)
+For Linux, there are RPM and DEB [packages](https://build.opensuse.org/project/show/home:tumic:QtPBFImagePlugin)
 for most common distros available on OBS.
 
 ## Limitations
-* Only data that is part of the PBF file is displayed. External layers defined in the
+* Only data that is part of the PBF file is displayed. External layers defined
-style are ignored.
+in the style are ignored.
-* Text PBF features must have a unique id (OpenMapTiles >= v3.7) for the text layout
+* Text PBF features must have a unique id (OpenMapTiles >= v3.7) for the text
-algorithm to work properly.
+layout algorithm to work properly. Additionally, the tile buffer must be large
-* Expressions are not supported in the styles, only property functions are implemented.
+enough to contain all neighboring text features overlapping to the tile bounds
+(only data from the tile itself can be drawn to the resulting image).
+* Expressions are not supported in the styles, only property functions are
+implemented.
 
 ## Changelog
 [Changelog](https://build.opensuse.org/projects/home:tumic:QtPBFImagePlugin/packages/QtPBFImagePlugin/files/qt6-qtpbfimageformat.changes)

src/data.cpp

@@ -27,8 +27,8 @@ static inline qint64 zigzag64decode(quint64 value)
 template<typename T>
 static bool varint(CTX &ctx, T &val)
 {
+	unsigned int shift = 0;
 	val = 0;
-	uint shift = 0;
 
 	while (ctx.bp < ctx.be) {
 		val |= ((quint8)*ctx.bp & 0x7F) << shift;
@@ -148,11 +148,11 @@ static bool skip(CTX &ctx)
 
 static bool value(CTX &ctx, QVariant &val)
 {
-	qint32 len;
 	QByteArray ba;
 	quint64 num;
 	double dnum;
 	float fnum;
+	qint32 len;
 
 	if (!length(ctx, len))
 		return false;