QGIS2.4segfaultQgsComposition::exportAsPDF

from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core import *


c = QgsComposition(QgsMapSettings())
c.setPaperSize(290, 210)
c.setPrintResolution(100)
c.setSnapGridOffsetX(3.5)
c.setSnapGridOffsetY(0)
c.setSnapGridResolution(2.5)
c.setNumPages(1)

cl = QgsComposerLabel(c)
cl.setItemPosition(0, 10, 100, 100)
content = 'test'
cl.setText(content)
cl.setFrameEnabled(False)
c.addItem(cl)

method2(c)

def method0(c):
    c.exportAsPDF('/tmp/test.pdf')

def method1(c):
    printer = QPrinter()
    printer.setOutputFormat(QPrinter.PdfFormat)
    printer.setOutputFileName("/tmp/out.pdf")
    printer.setPaperSize(QSizeF(c.paperWidth(), c.paperHeight()), QPrinter.Millimeter)
    printer.setFullPage(True)
    printer.setColorMode(QPrinter.Color)
    printer.setResolution(c.printResolution())
    pdfPainter = QPainter(printer)
    paperRectMM = printer.pageRect(QPrinter.Millimeter)
    paperRectPixel = printer.pageRect(QPrinter.DevicePixel)

    c.render(pdfPainter, paperRectPixel, paperRectMM)
    pdfPainter.end()

def method2(c):
    dpi = c.printResolution()
    dpmm = dpi / 25.4
    width = int(dpmm * c.paperWidth())
    height = int(dpmm * c.paperHeight())

    # create output image and initialize it
    image = QImage(QSize(width, height), QImage.Format_ARGB32)
    image.setDotsPerMeterX(dpmm * 1000)
    image.setDotsPerMeterY(dpmm * 1000)
    image.fill(0)

    # render the composition
    imagePainter = QPainter(image)
    sourceArea = QRectF(0, 0, c.paperWidth(), c.paperHeight())
    targetArea = QRectF(0, 0, width, height)
    c.render(imagePainter, targetArea, sourceArea)
    imagePainter.end()
    image.save("/tmp/out.png", "png")