wxPython Phoenix - backend_wxagg

_Werner_F_Bruhin · April 20, 2013, 6:58am

Hi,

I am trying to get matplotlib 1.2.0 to work with wxPython Phoenix - will provide a patch when it is working.

Made the changes to backend_wx* for things like EmptyImage/EmptyBitmap and Toolbar but I am stuck on the following.

     if bbox is None:
         # agg => rgba buffer -> bitmap
         if 'phoenix' in wx.PlatformInfo:
             return wx.Bitmap.FromBufferRGBA(int(agg.width), int(agg.height),
memoryview(agg.buffer_rgba()))
         else:
             return wx.BitmapFromBufferRGBA(int(agg.width), int(agg.height),
                                            agg.buffer_rgba())
     else:
         # agg => rgba buffer -> bitmap => clipped bitmap
         return _WX28_clipped_agg_as_bitmap(agg, bbox)

TypeError: cannot make memory view because object does not have the buffer interface
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 63, in <module>
   demo()
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 60, in demo
   app.MainLoop()
File "c:\Python27\Lib\site-packages\wx-2.9.6-msw-phoenix\wx\core.py", line 1841, in MainLoop
   rv = wx.PyApp.MainLoop(self)
File "c:\Python27\Lib\site-packages\matplotlib\backends\backend_wx.py", line 1209, in _onPaint
   self.draw(drawDC=drawDC)
File "c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py", line 61, in draw
   self.bitmap = _convert_agg_to_wx_bitmap(self.get_renderer(), None)
File "c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py", line 173, in _convert_agg_to_wx_bitmap
   memoryview(agg.buffer_rgba()))

I tried using "memoryview" based on a suggestion by Robin Dunn, and based on the following info I see in the debugger that should work no?

agg.buffer_rgba()
<read-write buffer ptr 0x05400638, size 229200 at 0x055FC680>
type(agg.buffer_rgba())
<type 'buffer'>
agg
<matplotlib.backends.backend_agg.RendererAgg instance at 0x04BA0670>

If I don't use "memoryview" (which would probably be preferred) I get the following exception.

Can someone help us figure this one out.

Thanks
Werner

TypeError: Bitmap.FromBufferRGBA(): argument 3 has unexpected type 'buffer'
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 63, in <module>
   demo()
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 60, in demo
   app.MainLoop()
File "c:\Python27\Lib\site-packages\wx-2.9.6-msw-phoenix\wx\core.py", line 1841, in MainLoop
   rv = wx.PyApp.MainLoop(self)
File "c:\Python27\Lib\site-packages\matplotlib\backends\backend_wx.py", line 1209, in _onPaint
   self.draw(drawDC=drawDC)
File "c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py", line 61, in draw
   self.bitmap = _convert_agg_to_wx_bitmap(self.get_renderer(), None)
File "c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py", line 173, in _convert_agg_to_wx_bitmap
   agg.buffer_rgba())

_Werner_F_Bruhin · April 26, 2013, 6:57am

Hi,

Anyone can provide some info on what "agg.buffer_rgba" returns and maybe even some suggestion on how to resolve this issue in the wxagg backend.

Thanks
Werner

P.S.
The archive on Sourceforge for this list stops in June 2012, noticed this as I wanted to check if there are answers I didn't get for some reason.
http://sourceforge.net/mailarchive/forum.php?forum_name=matplotlib-users

···

On 20/04/2013 08:58, Werner F. Bruhin wrote:

Hi,

I am trying to get matplotlib 1.2.0 to work with wxPython Phoenix - will
provide a patch when it is working.

Made the changes to backend_wx* for things like EmptyImage/EmptyBitmap
and Toolbar but I am stuck on the following.

      if bbox is None:
          # agg => rgba buffer -> bitmap
          if 'phoenix' in wx.PlatformInfo:
              return wx.Bitmap.FromBufferRGBA(int(agg.width),
int(agg.height),
memoryview(agg.buffer_rgba()))
          else:
              return wx.BitmapFromBufferRGBA(int(agg.width), int(agg.height),
                                             agg.buffer_rgba())
      else:
          # agg => rgba buffer -> bitmap => clipped bitmap
          return _WX28_clipped_agg_as_bitmap(agg, bbox)

TypeError: cannot make memory view because object does not have the
buffer interface
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 63, in
<module>
    demo()
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 60, in demo
    app.MainLoop()
File "c:\Python27\Lib\site-packages\wx-2.9.6-msw-phoenix\wx\core.py",
line 1841, in MainLoop
    rv = wx.PyApp.MainLoop(self)
File "c:\Python27\Lib\site-packages\matplotlib\backends\backend_wx.py",
line 1209, in _onPaint
    self.draw(drawDC=drawDC)
File
"c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py",
line 61, in draw
    self.bitmap = _convert_agg_to_wx_bitmap(self.get_renderer(), None)
File
"c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py",
line 173, in _convert_agg_to_wx_bitmap
    memoryview(agg.buffer_rgba()))

I tried using "memoryview" based on a suggestion by Robin Dunn, and
based on the following info I see in the debugger that should work no?

agg.buffer_rgba()
<read-write buffer ptr 0x05400638, size 229200 at 0x055FC680>
type(agg.buffer_rgba())
<type 'buffer'>
agg
<matplotlib.backends.backend_agg.RendererAgg instance at 0x04BA0670>

If I don't use "memoryview" (which would probably be preferred) I get
the following exception.

Can someone help us figure this one out.

Thanks
Werner

TypeError: Bitmap.FromBufferRGBA(): argument 3 has unexpected type 'buffer'
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 63, in
<module>
    demo()
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 60, in demo
    app.MainLoop()
File "c:\Python27\Lib\site-packages\wx-2.9.6-msw-phoenix\wx\core.py",
line 1841, in MainLoop
    rv = wx.PyApp.MainLoop(self)
File "c:\Python27\Lib\site-packages\matplotlib\backends\backend_wx.py",
line 1209, in _onPaint
    self.draw(drawDC=drawDC)
File
"c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py",
line 61, in draw
    self.bitmap = _convert_agg_to_wx_bitmap(self.get_renderer(), None)
File
"c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py",
line 173, in _convert_agg_to_wx_bitmap
    agg.buffer_rgba())

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Michael_Droettboom1 · April 26, 2013, 12:40pm

Hi,

Anyone can provide some info on what "agg.buffer_rgba" returns and maybe
even some suggestion on how to resolve this issue in the wxagg backend.

It returns a Python buffer object on Python 2, though on Python 3 it is a memoryview, since buffer was deprecated. Perhaps wx is also doing something different depending on the version of Python.

Thanks
Werner

P.S.
The archive on Sourceforge for this list stops in June 2012, noticed
this as I wanted to check if there are answers I didn't get for some reason.
matplotlib-users Mailing List for matplotlib

Yeah -- I've reported that to sourceforge many times. Not sure what the issue is. Personally, I use gmane when I need to search the archive and it works rather well.

Mike

···

On 04/26/2013 02:57 AM, Werner F. Bruhin wrote:

On 20/04/2013 08:58, Werner F. Bruhin wrote:

Hi,

I am trying to get matplotlib 1.2.0 to work with wxPython Phoenix - will
provide a patch when it is working.

Made the changes to backend_wx* for things like EmptyImage/EmptyBitmap
and Toolbar but I am stuck on the following.

       if bbox is None:
           # agg => rgba buffer -> bitmap
           if 'phoenix' in wx.PlatformInfo:
               return wx.Bitmap.FromBufferRGBA(int(agg.width),
int(agg.height),
memoryview(agg.buffer_rgba()))
           else:
               return wx.BitmapFromBufferRGBA(int(agg.width), int(agg.height),
                                              agg.buffer_rgba())
       else:
           # agg => rgba buffer -> bitmap => clipped bitmap
           return _WX28_clipped_agg_as_bitmap(agg, bbox)

TypeError: cannot make memory view because object does not have the
buffer interface
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 63, in
<module>
     demo()
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 60, in demo
     app.MainLoop()
File "c:\Python27\Lib\site-packages\wx-2.9.6-msw-phoenix\wx\core.py",
line 1841, in MainLoop
     rv = wx.PyApp.MainLoop(self)
File "c:\Python27\Lib\site-packages\matplotlib\backends\backend_wx.py",
line 1209, in _onPaint
     self.draw(drawDC=drawDC)
File
"c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py",
line 61, in draw
     self.bitmap = _convert_agg_to_wx_bitmap(self.get_renderer(), None)
File
"c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py",
line 173, in _convert_agg_to_wx_bitmap
     memoryview(agg.buffer_rgba()))

I tried using "memoryview" based on a suggestion by Robin Dunn, and
based on the following info I see in the debugger that should work no?

agg.buffer_rgba()
<read-write buffer ptr 0x05400638, size 229200 at 0x055FC680>
type(agg.buffer_rgba())
<type 'buffer'>
agg
<matplotlib.backends.backend_agg.RendererAgg instance at 0x04BA0670>

If I don't use "memoryview" (which would probably be preferred) I get
the following exception.

Can someone help us figure this one out.

Thanks
Werner

TypeError: Bitmap.FromBufferRGBA(): argument 3 has unexpected type 'buffer'
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 63, in
<module>
     demo()
File "h:\devProjectsT\aaTests\matplotlib\wxembedding-5.py", line 60, in demo
     app.MainLoop()
File "c:\Python27\Lib\site-packages\wx-2.9.6-msw-phoenix\wx\core.py",
line 1841, in MainLoop
     rv = wx.PyApp.MainLoop(self)
File "c:\Python27\Lib\site-packages\matplotlib\backends\backend_wx.py",
line 1209, in _onPaint
     self.draw(drawDC=drawDC)
File
"c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py",
line 61, in draw
     self.bitmap = _convert_agg_to_wx_bitmap(self.get_renderer(), None)
File
"c:\Python27\Lib\site-packages\matplotlib\backends\backend_wxagg.py",
line 173, in _convert_agg_to_wx_bitmap
     agg.buffer_rgba())

------------------------------------------------------------------------------
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analytics on semi-structured data. The platform includes APIs for building
apps and a phenomenal toolset for data science. Developers can use
our toolset for easy data analysis & visualization. Get a free account!
http://www2.precog.com/precogplatform/slashdotnewsletter
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_Werner_F_Bruhin · April 27, 2013, 10:23pm

Hi Michael,

Hi,

Anyone can provide some info on what "agg.buffer_rgba" returns and maybe
even some suggestion on how to resolve this issue in the wxagg backend.

It returns a Python buffer object on Python 2, though on Python 3 it is
a memoryview, since buffer was deprecated. Perhaps wx is also doing
something different depending on the version of Python.

As of Phoenix 2.9.5.81-r73873 matplot works with Phoenix, here is Robin Dunn's comment to the change he did on Phoenix with regards to the buffer handling.

Quote

The new buffer APIs go as far back as 2.6, IIRC, and the memoryview and bytearray object types are available in 2.7 in addition to 3.x and that I what I'm using in Phoenix. I would have expected MPL to do so also since numpy is an integral part of MPL and the new buffer interface was basically designed for and by numpy...

Anyway, while double checking all this I realized that it would not be hard for me to accept old or new buffer objects for source buffers (I'll still use memoryviews or bytearrays when on the producer side of things) so try again after the next snapshot build. My unittests with array.arrrays started working after the change so I expect that MPL's rgba buffer should work too.

EndQuote

Enclosed is the patch for backend_wx.py and for embedding_in_wx5.py which I used for testing, in the later I use wxversion.select to force selection of a particular version - I think the distribution should still just use ensureMinimal.

FYI, documentation for wxPython Phoenix are here:
http://wxpython.org/Phoenix/docs/html/index.html

And snapshots can be found here:
http://wxpython.org/Phoenix/snapshot-builds/

I tested only on Python 2.7.2 on Windows 7.

Werner

phoenixComp.patch (8.13 KB)

···

On 26/04/2013 14:40, Michael Droettboom wrote:

On 04/26/2013 02:57 AM, Werner F. Bruhin wrote:

Michael_Droettboom1 · May 3, 2013, 1:13pm

Would you mind submitting this as a pull request?

Mike

···

On 04/27/2013 06:23 PM, Werner F. Bruhin wrote:

Hi Michael,

On 26/04/2013 14:40, Michael Droettboom wrote:

On 04/26/2013 02:57 AM, Werner F. Bruhin wrote:

Hi,

Anyone can provide some info on what "agg.buffer_rgba" returns and maybe
even some suggestion on how to resolve this issue in the wxagg backend.

It returns a Python buffer object on Python 2, though on Python 3 it is
a memoryview, since buffer was deprecated. Perhaps wx is also doing
something different depending on the version of Python.

As of Phoenix 2.9.5.81-r73873 matplot works with Phoenix, here is Robin Dunn's comment to the change he did on Phoenix with regards to the buffer handling.

Quote

The new buffer APIs go as far back as 2.6, IIRC, and the memoryview and bytearray object types are available in 2.7 in addition to 3.x and that I what I'm using in Phoenix. I would have expected MPL to do so also since numpy is an integral part of MPL and the new buffer interface was basically designed for and by numpy...

Anyway, while double checking all this I realized that it would not be hard for me to accept old or new buffer objects for source buffers (I'll still use memoryviews or bytearrays when on the producer side of things) so try again after the next snapshot build. My unittests with array.arrrays started working after the change so I expect that MPL's rgba buffer should work too.

EndQuote

Enclosed is the patch for backend_wx.py and for embedding_in_wx5.py which I used for testing, in the later I use wxversion.select to force selection of a particular version - I think the distribution should still just use ensureMinimal.

FYI, documentation for wxPython Phoenix are here:
wxPython API Documentation — wxPython Phoenix 4.2.2a1 documentation

And snapshots can be found here:
Index of /Phoenix/snapshot-builds

I tested only on Python 2.7.2 on Windows 7.

Werner

------------------------------------------------------------------------------
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that delivers powerful full stack analytics. Optimize and monitor your
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Michael_Droettboom1 · May 3, 2013, 1:14pm

FWIW: Matplotlib uses the older buffer interface because that is what the older version of wx used (as well as other GUI toolkits). It would be nice to move to the new memoryview objects, but all of the GUI frameworks will need to move in tandem...

Mike

···

On 04/27/2013 06:23 PM, Werner F. Bruhin wrote:

Hi Michael,

On 26/04/2013 14:40, Michael Droettboom wrote:

On 04/26/2013 02:57 AM, Werner F. Bruhin wrote:

Hi,

Anyone can provide some info on what "agg.buffer_rgba" returns and maybe
even some suggestion on how to resolve this issue in the wxagg backend.

It returns a Python buffer object on Python 2, though on Python 3 it is
a memoryview, since buffer was deprecated. Perhaps wx is also doing
something different depending on the version of Python.

As of Phoenix 2.9.5.81-r73873 matplot works with Phoenix, here is Robin Dunn's comment to the change he did on Phoenix with regards to the buffer handling.

Quote

The new buffer APIs go as far back as 2.6, IIRC, and the memoryview and bytearray object types are available in 2.7 in addition to 3.x and that I what I'm using in Phoenix. I would have expected MPL to do so also since numpy is an integral part of MPL and the new buffer interface was basically designed for and by numpy...

Anyway, while double checking all this I realized that it would not be hard for me to accept old or new buffer objects for source buffers (I'll still use memoryviews or bytearrays when on the producer side of things) so try again after the next snapshot build. My unittests with array.arrrays started working after the change so I expect that MPL's rgba buffer should work too.

EndQuote

Enclosed is the patch for backend_wx.py and for embedding_in_wx5.py which I used for testing, in the later I use wxversion.select to force selection of a particular version - I think the distribution should still just use ensureMinimal.

FYI, documentation for wxPython Phoenix are here:
wxPython API Documentation — wxPython Phoenix 4.2.2a1 documentation

And snapshots can be found here:
Index of /Phoenix/snapshot-builds

I tested only on Python 2.7.2 on Windows 7.

Werner

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that delivers powerful full stack analytics. Optimize and monitor your
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_Werner_F_Bruhin · May 3, 2013, 1:58pm

agg.bufferNEW_rgba or something along those lines and then GUI
frameworks could move when they want/can, or would that create to
big of an overhead on MPL side.
Werner

···

Mike,

  On 03/05/2013 15:14, Michael Droettboom wrote:

    FWIW: Matplotlib uses the older

buffer interface because that is what the older version of wx
used (as well as other GUI toolkits). It would be nice to move
to the new memoryview objects, but all of the GUI frameworks
will need to move in tandem…