49 lines
1.8 KiB
Python
49 lines
1.8 KiB
Python
import ctypes
|
|
|
|
from .backend_cairo import cairo, FigureCanvasCairo, RendererCairo
|
|
from .backend_qt5 import QtCore, QtGui, _BackendQT5, FigureCanvasQT
|
|
from .qt_compat import QT_API
|
|
|
|
|
|
class FigureCanvasQTCairo(FigureCanvasQT, FigureCanvasCairo):
|
|
def __init__(self, figure):
|
|
super().__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().draw()
|
|
|
|
def paintEvent(self, event):
|
|
self._update_dpi()
|
|
dpi_ratio = self._dpi_ratio
|
|
width = dpi_ratio * self.width()
|
|
height = dpi_ratio * self.height()
|
|
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':
|
|
ctypes.c_long.from_address(id(buf)).value = 1
|
|
if hasattr(qimage, 'setDevicePixelRatio'):
|
|
# Not available on Qt4 or some older Qt5.
|
|
qimage.setDevicePixelRatio(dpi_ratio)
|
|
painter = QtGui.QPainter(self)
|
|
painter.eraseRect(event.rect())
|
|
painter.drawImage(0, 0, qimage)
|
|
self._draw_rect_callback(painter)
|
|
painter.end()
|
|
|
|
|
|
@_BackendQT5.export
|
|
class _BackendQT5Cairo(_BackendQT5):
|
|
FigureCanvas = FigureCanvasQTCairo
|