diff --git a/lib/matplotlib/backends/backend_qtagg.py b/lib/matplotlib/backends/backend_qtagg.py
index dde185107e98..5804b433490a 100644
--- a/lib/matplotlib/backends/backend_qtagg.py
+++ b/lib/matplotlib/backends/backend_qtagg.py
@@ -48,30 +48,31 @@ def paintEvent(self, event):
right = left + width
# create a buffer using the image bounding box
bbox = Bbox([[left, bottom], [right, top]])
- reg = self.copy_from_bbox(bbox)
- buf = cbook._unmultiplied_rgba8888_to_premultiplied_argb32(
- memoryview(reg))
+ buf = memoryview(self.copy_from_bbox(bbox))
- # clear the widget canvas
- painter.eraseRect(rect)
+ fmts = _enum("QtGui.QImage.Format")
+ if hasattr(fmts, "Format_RGBA8888"):
+ fmt = fmts.Format_RGBA8888
+ else: # Qt<=5.1 support.
+ fmt = fmts.Format_ARGB32_Premultiplied
+ buf = cbook._unmultiplied_rgba8888_to_premultiplied_argb32(buf)
if QT_API == "PyQt6":
from PyQt6 import sip
ptr = int(sip.voidptr(buf))
else:
ptr = buf
- qimage = QtGui.QImage(
- ptr, buf.shape[1], buf.shape[0],
- _enum("QtGui.QImage.Format").Format_ARGB32_Premultiplied)
+
+ painter.eraseRect(rect) # clear the widget canvas
+ qimage = QtGui.QImage(ptr, buf.shape[1], buf.shape[0], fmt)
_setDevicePixelRatio(qimage, self.device_pixel_ratio)
# set origin using original QT coordinates
origin = QtCore.QPoint(rect.left(), rect.top())
painter.drawImage(origin, qimage)
# Adjust the buf reference count to work around a memory
# leak bug in QImage under PySide.
- if QT_API in ('PySide', 'PySide2'):
- if QtCore.__version_info__ < (5, 12):
- ctypes.c_long.from_address(id(buf)).value = 1
+ if QT_API == "PySide2" and QtCore.__version_info__ < (5, 12):
+ ctypes.c_long.from_address(id(buf)).value = 1
self._draw_rect_callback(painter)
finally:
diff --git a/lib/matplotlib/cbook/__init__.py b/lib/matplotlib/cbook/__init__.py
index c9540d29cfaf..1e51f6a834cc 100644
--- a/lib/matplotlib/cbook/__init__.py
+++ b/lib/matplotlib/cbook/__init__.py
@@ -2056,7 +2056,7 @@ def discard(self, key):
self._od.pop(key, None)
-# Agg's buffers are unmultiplied RGBA8888, which neither PyQt5 nor cairo
+# Agg's buffers are unmultiplied RGBA8888, which neither PyQt<=5.1 nor cairo
# support; however, both do support premultiplied ARGB32.
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