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Avoid double draw in qt5cairo. #10399

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Merged
merged 1 commit into from
Feb 11, 2018
Merged

Avoid double draw in qt5cairo. #10399

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18 changes: 13 additions & 5 deletions lib/matplotlib/backends/backend_qt5cairo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,22 +7,30 @@ class FigureCanvasQTCairo(FigureCanvasQT, FigureCanvasCairo):
def __init__(self, figure):
super(FigureCanvasQTCairo, self).__init__(figure=figure)
self._renderer = RendererCairo(self.figure.dpi)
self._renderer.set_width_height(-1, -1) # Invalid values.

def draw(self):
if hasattr(self._renderer.gc, "ctx"):
self.figure.draw(self._renderer)
super(FigureCanvasQTCairo, self).draw()

def paintEvent(self, event):
self._update_dpi()
dpi_ratio = self._dpi_ratio
width = dpi_ratio * self.width()
height = dpi_ratio * self.height()
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
self._renderer.set_ctx_from_surface(surface)
self._renderer.set_width_height(width, height)
self.figure.draw(self._renderer)
buf = surface.get_data()
if (width, height) != self._renderer.get_canvas_width_height():
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
self._renderer.set_ctx_from_surface(surface)
self._renderer.set_width_height(width, height)
self.figure.draw(self._renderer)
buf = self._renderer.gc.ctx.get_target().get_data()
qimage = QtGui.QImage(buf, width, height,
QtGui.QImage.Format_ARGB32_Premultiplied)
# Adjust the buf reference count to work around a memory leak bug in
# QImage under PySide on Python 3.
if QT_API == 'PySide' and six.PY3:
import ctypes
ctypes.c_long.from_address(id(buf)).value = 1
if hasattr(qimage, 'setDevicePixelRatio'):
# Not available on Qt4 or some older Qt5.
Expand Down