Extracting bitmap data from an NSImage in python

I'm constructing wx.MemoryDC using the data from the NSImage, but the resulting code is very sluggish. It seems to me that TIFFRepresentation -> ImageFromStream step is the one that slows things down. Is there any way to avoid this step (all this streaming), and initi开发者_如何转开发alize MemoryDC directly from the NSImage data? Here is the sample code:

import wx
import cStringIO
from AppKit import NSImage

app = wx.PySimpleApp()
frame = wx.Frame(None, wx.ID_ANY, "Python")
static_bitmap = wx.StaticBitmap(frame,wx.NewId(), bitmap=wx.EmptyBitmap(640, 480))
frame.Show(True)


# wget http://upload.wikimedia.org/wikipedia/commons/d/d9/Test.png
ns_image = NSImage.alloc().initWithContentsOfFile_("Test.png")

for i in range(100):

    tiffdata = ns_image.TIFFRepresentation()

    image = wx.ImageFromStream(cStringIO.StringIO(tiffdata), wx.BITMAP_TYPE_TIF)

    bitmap = image.ConvertToBitmap()

    bmdc = wx.MemoryDC(bitmap)

    # bmdc.DrawCircle(10,10, 5)
    del bmdc
    static_bitmap.SetBitmap(bitmap)


app.MainLoop()

Try using:

bitmap = wx.BitmapFromBuffer(...)

instead of ImageFromStream.

Answering my own question: interface to NSIimage is inherently slow, the only workable solution is to avoid it altogether.