Jair Trejo wrote:
> I'm doing some image processing in PIL, and I want to
> display the results in a GTK window using PyCairo, so
> I create a Cairo image surface from the PIL Image like
> this:
> data
> mfile = StringIO.StringIO()
> final.save(mfile, format="PNG")
> ima =
> cairo.ImageSurface.create_from_png(mfile)
> mfile.close()
> return ima
>
> Where final is a PIL image. The problem is, I get a
> IOError: error while reading from Input Stream.
>
> ¿Any idea of why is this happening?
"save" leaves the file pointer at an undefined position (usually at the
end), so my guess is that you have to rewind the file before you pass it
to the next function:
final.save(mfile, format="PNG")
mfile.seek(0) # rewind
also note that compressing and decompressing will introduce unnecessary
overhead; chances are that you might get a lot better performance if you
just shuffle the raw pixels. I haven't used PyCairo myself, but from a
quick look at the ImageSurface documentation, something like this should
work (untested):
if final.mode != "RGB":
final = final.convert("RGB")
w, h = final.size
data = final.tostring() # get packed RGB buffer
ima = cairo.ImageSurface.create(data, FORMAT_RGB24, w, h, w*3)
(tweak as necessary)
</F>
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