def resizeEvent(self, event):
width, height = self.size().width(), self.size().height()
# Update underlying pixmap
self.__dirtyPixmap = True
self.__pixmap = np.empty((height, width, 4), dtype=np.uint8)
errCode = mesa.OSMesaMakeCurrent(self.__context, self.__pixmap,
gl.GL_UNSIGNED_BYTE, width, height)
assert errCode == gl.GL_TRUE
mesa.OSMesaPixelStore(mesa.OSMESA_Y_UP, 0)
self.makeCurrent()
gl.testGL()
self.initializeGL()
self.resizeGL(width, height)
QLabel.resizeEvent(self, event)
def __createOSMesaContext(self):
"""Creates an OSMesa context, assigning it to an attribute called
``__context``.
"""
import OpenGL.GL as gl
import OpenGL.raw.osmesa.mesa as osmesa
import OpenGL.arrays as glarrays
log.debug('Creating gl.OSMesaContext')
# We have to create a dummy buffer
# for the off-screen context.
buffer = glarrays.GLubyteArray.zeros((640, 480, 4))
context = osmesa.OSMesaCreateContextExt(gl.GL_RGBA, 8, 4, 0, None)
osmesa.OSMesaMakeCurrent(context, buffer, gl.GL_UNSIGNED_BYTE, 640,
480)
self.__buffer = buffer
self.__context = context
def paintEvent(self, event):
# Only refresh content when paint comes from backend
if self.__dirtyPixmap:
self.__dirtyPixmap = False
height, width = self.__pixmap.shape[0:2]
assert width == self.size().width()
assert height == self.size().height()
errCode = mesa.OSMesaMakeCurrent(self.__context, self.__pixmap,
gl.GL_UNSIGNED_BYTE, width,
height)
assert errCode == gl.GL_TRUE
self.makeCurrent()
self.paintGL()
gl.glFinish()
image = QImage(self.__pixmap.data, width, height,
QImage.Format_ARGB32)
self.setPixmap(QPixmap.fromImage(image))
QLabel.paintEvent(self, event)