Public bug reported:
Binary package hint: python-qt4
I am seeing some data corruption in QImage objects when using python-qt4
in hardy. A very simple script that should demonstrate this looks like:
from PyQt4 import QtGui
# Create a 100x100 image, all black
im = QtGui.QImage('\0'*40000, 100, 100, QtGui.QImage.Format_RGB32)
# print the last pixel value
print "0x%lx" % im.pixel(99, 99)
# create a new variable to write into memory
d = '\1'*40000
# print the last pixel value again
print "0x%lx" % im.pixel(99, 99)
On my machine, the output is:
0x0
0x1010101
The second number printed is a corrupted pixel, and should be 0x0. The
obvious explanation to me is that QtGui.QImage() is not incrementing the
reference count to the image string it accepts, which allows it to be
deleted and overwritten later.
** Affects: python-qt4 (Ubuntu)
Importance: Undecided
Status: New
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image corruption in pyqt4 qimage
https://bugs.launchpad.net/bugs/214780
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