Initial commit

venv/lib/python3.10/site-packages/matplotlib/backends/backend_qtcairo.py

@@ -0,0 +1,46 @@
+import ctypes
+
+from .backend_cairo import cairo, FigureCanvasCairo
+from .backend_qt import _BackendQT, FigureCanvasQT
+from .qt_compat import QT_API, QtCore, QtGui
+
+
+class FigureCanvasQTCairo(FigureCanvasCairo, FigureCanvasQT):
+    def draw(self):
+        if hasattr(self._renderer.gc, "ctx"):
+            self._renderer.dpi = self.figure.dpi
+            self.figure.draw(self._renderer)
+        super().draw()
+
+    def paintEvent(self, event):
+        width = int(self.device_pixel_ratio * self.width())
+        height = int(self.device_pixel_ratio * self.height())
+        if (width, height) != self._renderer.get_canvas_width_height():
+            surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
+            self._renderer.set_context(cairo.Context(surface))
+            self._renderer.dpi = self.figure.dpi
+            self.figure.draw(self._renderer)
+        buf = self._renderer.gc.ctx.get_target().get_data()
+        if QT_API == "PyQt6":
+            from PyQt6 import sip
+            ptr = int(sip.voidptr(buf))
+        else:
+            ptr = buf
+        qimage = QtGui.QImage(
+            ptr, width, height,
+            QtGui.QImage.Format.Format_ARGB32_Premultiplied)
+        # Adjust the buf reference count to work around a memory leak bug in
+        # QImage under PySide.
+        if QT_API == "PySide2" and QtCore.__version_info__ < (5, 12):
+            ctypes.c_long.from_address(id(buf)).value = 1
+        qimage.setDevicePixelRatio(self.device_pixel_ratio)
+        painter = QtGui.QPainter(self)
+        painter.eraseRect(event.rect())
+        painter.drawImage(0, 0, qimage)
+        self._draw_rect_callback(painter)
+        painter.end()
+
+
+@_BackendQT.export
+class _BackendQTCairo(_BackendQT):
+    FigureCanvas = FigureCanvasQTCairo