How to enable edge blending in chromium 1 .9 under windows

Hi all
I am building a tile-display system under windows xp with chromium. Everything is ok except the edge blending.
According to the doc, I had added
nodes[1].Conf("overlap_blending", "knockout")
in the crserver config but it doesn't work.
Anyone knows how to enable it??
thanks
 
 
Below is the conf file i used:
 
# Chromium configuration produced by configtool.py
import string
import sys
sys.path.append( "../server" )
from mothership import *
MOTHERSHIP_OPTIONS = [
 ("MTU", 500000),
 ("auto_start", 0),
 ("auto_start_apps", 0),
 ("autostart_branches", 0),
 ("autostart_max_nodes_per_thread", 1),
]
DEFAULT_APP = ""
AUTO_START_SERVERS = 0
AUTO_START_APPS = 0
# Look for autostart option
for (name, value) in MOTHERSHIP_OPTIONS:
 if name == "auto_start":
  AUTO_START_SERVERS = value
 elif name == "auto_start_apps":
  AUTO_START_APPS = value
# Get program name
if len(sys.argv) == 1:
 pass
elif len(sys.argv) == 2:
 DEFAULT_APP = sys.argv[1]
else:
 print "Usage: %s <program>" % sys.argv[0] 
 sys.exit(-1)
if DEFAULT_APP == "":
 print "No program to run!"
 sys.exit(-1)

cr = CR()
nodes = range(3)
nodes[0] = CRNetworkNode('localhost')
nodes[0].Conf("overlap_blending", "knockout")
nodes[0].SetPosition(210, 10)
cr.AddNode(nodes[0])
if AUTO_START_SERVERS:
 nodes[0].AutoStart( [ "/bin/sh", "-c", "LD_LIBRARY_PATH=%s MOTHERSHIP=localhost %s/crserver" % (crlibdir, crbindir) ] )
nodes[1] = CRNetworkNode('localhost')
nodes[1].Conf("overlap_blending", "knockout")
nodes[1].SetPosition(210, 80)
cr.AddNode(nodes[1])
if AUTO_START_SERVERS:
 nodes[1].AutoStart( [ "/bin/sh", "-c", "LD_LIBRARY_PATH=%s MOTHERSHIP=localhost %s/crserver" % (crlibdir, crbindir) ] )
nodes[2] = CRApplicationNode('localhost')
nodes[2].Conf("application", DEFAULT_APP)
nodes[2].Conf("start_dir", crbindir)
nodes[2].SetPosition(10, 45)
cr.AddNode(nodes[2])
if AUTO_START_APPS:
 nodes[2].AutoStart( [ "/bin/sh", "-c", "LD_LIBRARY_PATH=%s MOTHERSHIP=localhost %s/crappfaker" % (crlibdir, crbindir) ] )

# network nodes[0]
spus = range(1)
spus[0] = SPU('render')
spus[0].Conf("title", "Chromium Render SPU 0")
spus[0].Conf("window_geometry", [0, 0, 300, 300])
spus[0].Conf("display_string", ":0")
nodes[0].AddSPU(spus[0])
nodes[0].AddTile(0, 0, 300, 300)
# network nodes[1]
spus = range(1)
spus[0] = SPU('render')
spus[0].Conf("title", "Chromium Render SPU 1")
spus[0].Conf("window_geometry", [310, 0, 300, 300])
spus[0].Conf("display_string", ":0")
nodes[1].AddSPU(spus[0])
nodes[1].AddTile(200, 0, 300, 300)
# application nodes[2]
spus = range(1)
spus[0] = SPU('tilesort')
spus[0].Conf("bucket_mode", "Broadcast")
spus[0].AddServer(nodes[0], protocol='tcpip', port=7000)
spus[0].AddServer(nodes[1], protocol='tcpip', port=7001)
nodes[2].AddSPU(spus[0])
 
# Set mothership params
for (name, value) in MOTHERSHIP_OPTIONS:
 cr.Conf(name, value)
cr.Go()

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