I discovered another blitting bug in backend_qt4agg.py. Qt expects a pixmap
stringBuffer formatted in ARGB, but mpl formats in RGBA. The qt4 backend
usually uses the _renderer.tostring_bgra method to return a properly
formatted buffer:
if QtCore.QSysInfo.ByteOrder == QtCore.QSysInfo.LittleEndian:
stringBuffer = self.renderer._renderer.tostring_bgra()
else:
stringBuffer = self.renderer._renderer.tostring_argb()
The problem I am seeing is when we are blitting, and the tostring_bgra is not
available. The blitting code in backend_qt4agg.py, starting around line 112,
gets a buffer from a region copied from a bbox:
reg = self.copy_from_bbox(bbox)
stringBuffer = reg.to_string()
qImage = QtGui.QImage(stringBuffer, w, h, QtGui.QImage.Format_ARGB32)
reg does not have a method to swap the byte order, and Qt does not have a
Format_RGBA32. Could anyone suggest how to swap the byte order?
Thanks,
Darren
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