47 lines
1.7 KiB
Python
47 lines
1.7 KiB
Python
import ctypes
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from .backend_cairo import cairo, FigureCanvasCairo
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from .backend_qt import _BackendQT, FigureCanvasQT
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from .qt_compat import QT_API, QtCore, QtGui
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class FigureCanvasQTCairo(FigureCanvasCairo, FigureCanvasQT):
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def draw(self):
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if hasattr(self._renderer.gc, "ctx"):
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self._renderer.dpi = self.figure.dpi
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self.figure.draw(self._renderer)
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super().draw()
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def paintEvent(self, event):
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width = int(self.device_pixel_ratio * self.width())
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height = int(self.device_pixel_ratio * self.height())
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if (width, height) != self._renderer.get_canvas_width_height():
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surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
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self._renderer.set_context(cairo.Context(surface))
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self._renderer.dpi = self.figure.dpi
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self.figure.draw(self._renderer)
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buf = self._renderer.gc.ctx.get_target().get_data()
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if QT_API == "PyQt6":
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from PyQt6 import sip
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ptr = int(sip.voidptr(buf))
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else:
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ptr = buf
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qimage = QtGui.QImage(
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ptr, width, height,
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QtGui.QImage.Format.Format_ARGB32_Premultiplied)
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# Adjust the buf reference count to work around a memory leak bug in
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# QImage under PySide.
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if QT_API == "PySide2" and QtCore.__version_info__ < (5, 12):
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ctypes.c_long.from_address(id(buf)).value = 1
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qimage.setDevicePixelRatio(self.device_pixel_ratio)
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painter = QtGui.QPainter(self)
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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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@_BackendQT.export
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class _BackendQTCairo(_BackendQT):
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FigureCanvas = FigureCanvasQTCairo
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