Fixed random crashes (segfaults) on Linux related to Qt objects stored in cache data

Author: PierreRaybaut

CHANGELOG.md

@@ -1,5 +1,14 @@
 # PythonQwt Releases
 
+## Version 0.12.6
+
+- Fixed random crashes (segfaults) on Linux related to Qt objects stored in cache data
+  structures (`QwtText` and `QwtSymbol`)
+
+- Test suite can simply be run with `pytest` and specific configuration (`conftest.py`)
+  will be taken into account (previously, the test suite has to be run with
+  `pytest qwt` in order to be successfully configured)
+
 ## Version 0.12.5
 
 - Add support for NumPy 2.0:

qwt/__init__.py

@@ -55,7 +55,7 @@
 from qwt.text import QwtText  # noqa: F401
 from qwt.toqimage import array_to_qimage as toQImage  # noqa: F401
 
-__version__ = "0.12.5"
+__version__ = "0.12.6"
 QWT_VERSION_STR = "6.1.5"
 
 

qwt/symbol.py

@@ -341,7 +341,7 @@ def __init__(self, st, br, pn, sz):
         self.brush = br
         self.pen = pn
         self.isPinPointEnabled = False
-        self.pinPoint = QPointF()
+        self.pinPoint = None
 
         class Path(object):
             def __init__(self):
@@ -1235,7 +1235,7 @@ def invalidateCache(self):
             :py:meth:`setCachePolicy()`, :py:meth:`drawSymbols()`
         """
         if self.__data.cache.pixmap is not None:
-            self.__data.cache.pixmap = QPixmap()
+            self.__data.cache.pixmap = None
 
     def setStyle(self, style):
         """

qwt/text.py

@@ -474,11 +474,11 @@ def __init__(self):
 
 class QwtText_LayoutCache(object):
     def __init__(self):
-        self.textSize = QSizeF()
+        self.textSize = None
         self.font = None
 
     def invalidate(self):
-        self.textSize = QSizeF()
+        self.textSize = None
 
 
 class QwtText(object):
@@ -987,7 +987,8 @@ def textSize(self, defaultFont):
         """
         font = QFont(self.usedFont(defaultFont))
         if (
-            not self.__layoutCache.textSize.isValid()
+            self.__layoutCache.textSize is None
+            or not self.__layoutCache.textSize.isValid()
             or self.__layoutCache.font is not font
         ):
             self.__layoutCache.textSize = self.__data.textEngine.textSize(