@@ -48,30 +48,31 @@ def paintEvent(self, event):
4848right = left + width
4949# create a buffer using the image bounding box
5050bbox = Bbox ([[left ,bottom ], [right ,top ]])
51- reg = self .copy_from_bbox (bbox )
52- buf = cbook ._unmultiplied_rgba8888_to_premultiplied_argb32 (
53- memoryview (reg ))
51+ buf = memoryview (self .copy_from_bbox (bbox ))
5452
55- # clear the widget canvas
56- painter .eraseRect (rect )
53+ fmts = _enum ("QtGui.QImage.Format" )
54+ if hasattr (fmts ,"Format_RGBA8888" ):
55+ fmt = fmts .Format_RGBA8888
56+ else :# Qt<=5.1 support.
57+ fmt = fmts .Format_ARGB32_Premultiplied
58+ buf = cbook ._unmultiplied_rgba8888_to_premultiplied_argb32 (buf )
5759
5860if QT_API == "PyQt6" :
5961from PyQt6 import sip
6062ptr = int (sip .voidptr (buf ))
6163else :
6264ptr = buf
63- qimage = QtGui . QImage (
64- ptr , buf . shape [ 1 ], buf . shape [ 0 ],
65- _enum ( " QtGui.QImage.Format" ). Format_ARGB32_Premultiplied )
65+
66+ painter . eraseRect ( rect ) # clear the widget canvas
67+ qimage = QtGui .QImage ( ptr , buf . shape [ 1 ], buf . shape [ 0 ], fmt )
6668_setDevicePixelRatio (qimage ,self .device_pixel_ratio )
6769# set origin using original QT coordinates
6870origin = QtCore .QPoint (rect .left (),rect .top ())
6971painter .drawImage (origin ,qimage )
7072# Adjust the buf reference count to work around a memory
7173# leak bug in QImage under PySide.
72- if QT_API in ('PySide' ,'PySide2' ):
73- if QtCore .__version_info__ < (5 ,12 ):
74- ctypes .c_long .from_address (id (buf )).value = 1
74+ if QT_API == "PySide2" and QtCore .__version_info__ < (5 ,12 ):
75+ ctypes .c_long .from_address (id (buf )).value = 1
7576
7677self ._draw_rect_callback (painter )
7778finally :