[cairo] unable to make PIL work with cairo

[wecing]

This time, I wrote my code like this:

>     def video_observer(self, f):
>
>         img = Image.frombuffer('RGB', (self._width, self._height), f.data,
>> \
>
>                                'raw', 'RGB', 0, 1)
>
>
>>         img = img.resize((self.nwidth, self.nheight))
>
>         img.save('%d.jpg' % self.cnt, 'JPEG') # debug! :-P
>
>
>
>         imgd = img.tostring('raw', 'RGBA', 0, 1)
>
>         a = array.array('B', imgd)
>
>
>>         surface = cairo.ImageSurface.create_for_data(a,
>> cairo.FORMAT_ARGB32, \
>
>             self.nwidth, self.nheight, self.nwidth * 4) # self.nwidth * 4
>
>
>>         surface.write_to_png('%d.png' % self.cnt)
>
>
>>         self.context.set_source_surface(surface, 0, 0)
>
>         self.context.paint()
>
>
But...

>   File "main.py", line 98, in video_observer

    imgd = img.tostring('raw', 'RGBA', 0, 1)

  File "/usr/lib/python2.6/dist-packages/PIL/Image.py", line 535, in
> tostring

    e = _getencoder(self.mode, encoder_name, args)

  File "/usr/lib/python2.6/dist-packages/PIL/Image.py", line 399, in
> _getencoder

    return apply(encoder, (mode,) + args + extra)

SystemError: unknown raw mode



On Sun, Jan 9, 2011 at 2:37 AM, Andrea Canciani <ranma42 at gmail.com> wrote:

> On Sat, Jan 8, 2011 at 5:09 PM, wecing <w3cing at gmail.com> wrote:
> > Currently i'm writing a video player which uses cairo to draw subtitle on
> > each frame.
> > I successfully extracted all the frames as PIL Image objects, but I
> failed
> > to create cairo surfaces with that.
> > I refered to http://cairographics.org/pythoncairopil/ , but it seems
> that
> > maybe there're some problems in the document.
> > Here is the traceback:
> >   File "main.py", line 96, in video_observer
> >     img.get_data(), 'raw', 'RGBA', 0, 1)
> >   File "/usr/lib/python2.6/dist-packages/PIL/Image.py", line 512, in
> > __getattr__
> >     raise AttributeError(name)
> > AttributeError: get_data
>
> It looks like you're trying to use the get_data() member of a PIL
> image (but it doesn't exist). get_data() is a member of cairo images,
> but to access PIL images raw data you might need something like:
>
>    data = pil_image.tostring("raw","RGBA",0,1)
>
> or (if the format is already correct), just:
>
>    data = pil_image.getdata() # (no underscore between "get" and "data").
>
> See http://www.pythonware.com/library/pil/handbook/image.htm and
>
> http://cairographics.org/documentation/pycairo/2/reference/surfaces.html#class-imagesurface-surface
> for reference.
>
> Andrea
>
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