[cairo] rsvg and cairo alpha puzzle

[Donn]

Dom & Bertram,
I'm pretty sure I have blundered, but near as I can tell right now it seems no 
different. I am in no-way used to C and makefiles etc. so the chances are 
high that it's my fault.

I fetched the librsvg-2.20.0 source and the gnome-python-desktop-2.21.2 
source. 
I compiled librsvg first, default configure. No errors.

Then I did the other gnome-python one. No errors.
The paths are screwball, but I moved the rsvg.so and .la files into 
my /usr/lib/python2.5/site-packages/gtk-2.0 directory

From the output of both make install, it *seems* that everything is pointing 
to the latest librsvg sources etc.

I can't get a version number from 'rsvg' via python, but rsvg.__file__ shows 
it's pointing to the expected rsvg.so file.

The code I am using to test this (in Python) is:

#! /usr/bin/env python
import pygtk
pygtk.require('2.0')
import gtk, gobject, cairo
import rsvg

class Screen(gtk.DrawingArea):
    __gsignals__ = { "expose-event": "override" }
    def do_expose_event(self, event):
        # Create the cairo context
        cr = self.window.cairo_create()
        self.draw(cr, *self.window.get_size())
def run ( Widget, w, h):
    window = gtk.Window()
    window.connect("delete-event", gtk.main_quit)
    window.set_size_request ( w, h )
    widget = Widget()
    widget.show()
    window.add(widget)
    window.present()
    gtk.main()

class Shapes ( Screen ):
    def draw(self, cr, width, height):
        cr.translate ( 200, 210 )
        # When you remark 1,2 & 3 below, the translate above
        # no longer works.
        #cr.push_group ( ) # 1. remark this
        obj.render_cairo ( cr )
        #cr.pop_group_to_source ( ) # 2. remark this
        #cr.paint_with_alpha ( 0.5 ) # 3. remark this
        
        
obj = rsvg.Handle ( "somefile.svg" )

run ( Shapes, 400, 400 )

HTH
\d


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altruistic, cooperative and even attended by benevolent subjective emotions, 
but that this follows from, rather than contradicts, selfishness at the 
genetic level."
-- Richard Dawkins

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