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Commit879b7f0

Browse files
tacaswelltimhoffm
authored andcommitted
FIX: always eraseRect in Qt widget (#13050)
Re-focusing the figure window will call the draw method. If thefacecolor of the figure and axes are transparent and we do noterase the widget we are effectively compositing the figure on to itsself which results in artifacts anywhere there is alpha oranti-aliasing.Closes#13012
1 parente7719da commit879b7f0

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3 files changed

+5
-9
lines changed

3 files changed

+5
-9
lines changed

‎lib/matplotlib/backends/backend_qt5.py

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Original file line numberDiff line numberDiff line change
@@ -240,7 +240,6 @@ def __init__(self, figure):
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self._dpi_ratio_prev=None
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self._draw_pending=False
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self._erase_before_paint=False
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self._is_drawing=False
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self._draw_rect_callback=lambdapainter:None
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@@ -491,7 +490,6 @@ def draw(self):
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return
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withcbook._setattr_cm(self,_is_drawing=True):
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super().draw()
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self._erase_before_paint=True
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self.update()
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defdraw_idle(self):

‎lib/matplotlib/backends/backend_qt5agg.py

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -38,10 +38,6 @@ def paintEvent(self, event):
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painter=QtGui.QPainter(self)
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ifself._erase_before_paint:
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painter.eraseRect(self.rect())
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self._erase_before_paint=False
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rect=event.rect()
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left=rect.left()
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top=rect.top()
@@ -55,6 +51,10 @@ def paintEvent(self, event):
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reg=self.copy_from_bbox(bbox)
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buf=cbook._unmultiplied_rgba8888_to_premultiplied_argb32(
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memoryview(reg))
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# clear the widget canvas
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painter.eraseRect(rect)
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qimage=QtGui.QImage(buf,buf.shape[1],buf.shape[0],
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QtGui.QImage.Format_ARGB32_Premultiplied)
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ifhasattr(qimage,'setDevicePixelRatio'):

‎lib/matplotlib/backends/backend_qt5cairo.py

Lines changed: 1 addition & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -37,9 +37,7 @@ def paintEvent(self, event):
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# Not available on Qt4 or some older Qt5.
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qimage.setDevicePixelRatio(dpi_ratio)
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painter=QtGui.QPainter(self)
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ifself._erase_before_paint:
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painter.eraseRect(self.rect())
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self._erase_before_paint=False
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painter.eraseRect(event.rect())
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painter.drawImage(0,0,qimage)
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self._draw_rect_callback(painter)
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painter.end()

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